LT3015EDD-3#PBF - LINEAR TECHNOLOGY

LT3015 Series

3015fb

The LT

3015 series are low noise, low dropout, negative

linear regulators with fast transient response. The devices

supply up to 1.5A of output current at a typical dropout

voltage of 310mV. Operating quiescent current is typically

1.1mA and drops to < 1µA in shutdown. Quiescent current

is also well controlled in dropout. In addition to fast tran-

sient response, the LT3015 series exhibit very low output

noise, making them ideal for noise sensitive applications.

The LT3015 regulators are stable with a minimum 10µF

output capacitor. Moreover, the regulator can use small

ceramic capacitors without the necessary addition of ESR

as is common with other regulators. Internal protection

circuitry includes reverse output protection, precision cur-

rent limit with foldback and thermal limit with hysteresis.

The LT3015 regulators are available in fixed output volt-

ages of –2.5V, –3V, –3.3V, –5V, –12V and –15V and as an

adjustable device with a –1.22V reference voltage. Pack-

ages include the 5-lead TO-220 and DD-Pak, a thermally

enhanced 12-lead MSOP and the low profile (0.75 mm)

8-lead 3mm × 3mm DFN.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

TYPICAL APPLICATION

FEATURES DESCRIPTION

1.5A, Low Noise,

Negative Linear Regulator

with Precision Current Limit

–5V, –1.5A, Low Noise Regulator

APPLICATIONS

n Output Current: 1.5A

n Dropout Voltage: 310mV

n Precision Current Limit with Foldback

n Low Output Noise: 60µVRMS (10Hz to 100kHz)

n Low Quiescent Current: 1.1mA

n Precision Positive or Negative Shutdown Logic

n Fast Transient Response

n Wide Input Voltage Range: –1.8V to –30V

n Adjustable Output Voltage Range: –1.22V to –29.3V

n Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V

n Controlled Quiescent Current in Dropout

n <1µA Quiescent Current in Shutdown

n Stable with 10µF Output Capacitor

n Stable with Ceramic, Tantalum or Aluminum Capacitors

n Thermal Limit with Hysteresis

n Reverse Output Protection

n 5-Lead TO-220 and DD-Pak, Thermally Enhanced

12-Lead MSOP and 8-Lead 3mm × 3mm × 0.75mm

DFN Packages

n Post-Regulator for Switching Supplies

n Negative Logic Supplies

n Low Noise Instrumentation

n Industrial Supplies

n Negative Complement to the LT1963A

GND

SENSE

OUT

SHDN

LT3015-5

10µF

VOUT

–5V

–1.5A

VIN

–5.5V TO

–30V

3015 TA01

Dropout Voltage

LOAD CURRENT (A)

DROPOUT VOLTAGE (mV)

400

350

300

250

200

150

100

450

–0.8 –1.0 –1.2 –1.4 –1.6–0.2 –0.4

3015 TA01a

–0.6

TJ = 25°C

DD-PAK/TO-220

DFN/MSOP

LT3015 Series

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PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

IN Pin Voltage .........................................................±33V

OUT Pin Voltage (Note 10) ......................................±33V

OUT to IN Differential Voltage (Note 10) ........–0.3V, 33V

SENSE Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 33V

ADJ Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 33V

SHDN Pin Voltage

(with Respect to IN Pin) (Note 10) .................–0.3V, 55V

(Note 1)

TOP VIEW

DD PACKAGE

8-LEAD (3mm × 3mm) PLASTIC DFN

1IN

SHDN

GND

OUT

SENSE/ADJ*

GND

TJMAX = 125°C, qJA = 40°C/W, qJC = 7.5°C/W

EXPOSED PAD (PIN 9) IS IN, MUST BE SOLDERED TO PCB

*PIN 6 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 6 = ADJ FOR LT3015

SHDN

GND

OUT

SENSE/ADJ*

GND

TOP VIEW

MSE PACKAGE

12-LEAD PLASTIC MSOP

TJMAX = 125°C, qJA = 37°C/W, qJC = 10°C/W

EXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB

*PIN 8 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 8 = ADJ FOR LT3015

Q PACKAGE

5-LEAD PLASTIC DD-PAK

FRONT VIEW

TAB IS IN

OUT

SENSE/ADJ*

GND

SHDN

TJMAX = 125°C, qJA = 14°C/W, qJC = 3°C/W

*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 4 = ADJ FOR LT3015

T PACKAGE

5-LEAD PLASTIC TO-220

OUT

SENSE/ADJ*

GND

SHDN

FRONT VIEW

TAB IS IN

TJMAX = 125°C, qJA = 50°C/W, qJC = 3°C/W

*PIN 4 = SENSE FOR LT3015-2.5/-3/-3.3/-5/-12/-15

*PIN 4 = ADJ FOR LT3015

SHDN Pin Voltage

(with Respect to GND Pin) ..............................–33V, 22V

Output Short-Circuit Duration .......................... Indefinite

Operating Junction Temperature Range (Note 9)

E-, I-Grade ........................................ –40°C to 125°C

MP-Grade ......................................... –55°C to 125°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10Sec)

MS12E Package ................................................ 300°C

Q, T Packages ...................................................250°C

LT3015 Series

3015fb

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT3015EDD#PBF LT3015EDD#TRPBF LFXS 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD#PBF LT3015IDD#TRPBF LFXS 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-2.5#PBF LT3015EDD-2.5#TRPBF LGDJ 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-2.5#PBF LT3015IDD-2.5#TRPBF LGDJ 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-3#PBF LT3015EDD-3#TRPBF LGDK 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-3#PBF LT3015IDD-3#TRPBF LGDK 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-3.3#PBF LT3015EDD-3.3#TRPBF LGDM 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-3.3#PBF LT3015IDD-3.3#TRPBF LGDM 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-5#PBF LT3015EDD-5#TRPBF LGDN 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-5#PBF LT3015IDD-5#TRPBF LGDN 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-12#PBF LT3015EDD-12#TRPBF LGDP 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-12#PBF LT3015IDD-12#TRPBF LGDP 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EDD-15#PBF LT3015EDD-15#TRPBF LGDQ 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015IDD-15#PBF LT3015IDD-15#TRPBF LGDQ 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C

LT3015EMSE#PBF LT3015EMSE#TRPBF 3015 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE#PBF LT3015IMSE#TRPBF 3015 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE#PBF LT3015MPMSE#TRPBF 3015 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-2.5#PBF LT3015EMSE-2.5#TRPBF 301525 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-2.5#PBF LT3015IMSE-2.5#TRPBF 301525 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-2.5#PBF LT3015MPMSE-2.5#TRPBF 301525 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-3#PBF LT3015EMSE-3#TRPBF 30153 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-3#PBF LT3015IMSE-3#TRPBF 30153 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-3#PBF LT3015MPMSE-3#TRPBF 30153 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-3.3#PBF LT3015EMSE-3.3#TRPBF 301533 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-3.3#PBF LT3015IMSE-3.3#TRPBF 301533 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-3.3#PBF LT3015MPMSE-3.3#TRPBF 301533 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-5#PBF LT3015EMSE-5#TRPBF 30155 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-5#PBF LT3015IMSE-5#TRPBF 30155 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-5#PBF LT3015MPMSE-5#TRPBF 30155 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-12#PBF LT3015EMSE-12#TRPBF 301512 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-12#PBF LT3015IMSE-12#TRPBF 301512 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-12#PBF LT3015MPMSE-12#TRPBF 301512 12-Lead Plastic MSOP –55°C to 125°C

LT3015EMSE-15#PBF LT3015EMSE-15#TRPBF 301515 12-Lead Plastic MSOP –40°C to 125°C

LT3015IMSE-15#PBF LT3015IMSE-15#TRPBF 301515 12-Lead Plastic MSOP –40°C to 125°C

LT3015MPMSE-15#PBF LT3015MPMSE-15#TRPBF 301515 12-Lead Plastic MSOP –55°C to 125°C

LT3015 Series

3015fb

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT3015EQ#PBF LT3015EQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ#PBF LT3015IQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ#PBF LT3015MPQ#TRPBF LT3015Q 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-2.5#PBF LT3015EQ-2.5#TRPBF LT3015Q-2.5 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-2.5#PBF LT3015IQ-2.5#TRPBF LT3015Q-2.5 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-2.5#PBF LT3015MPQ-2.5#TRPBF LT3015Q-2.5 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-3#PBF LT3015EQ-3#TRPBF LT3015Q-3 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-3#PBF LT3015IQ-3#TRPBF LT3015Q-3 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-3#PBF LT3015MPQ-3#TRPBF LT3015Q-3 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-3.3#PBF LT3015EQ-3.3#TRPBF LT3015Q-3.3 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-3.3#PBF LT3015IQ-3.3#TRPBF LT3015Q-3.3 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-3.3#PBF LT3015MPQ-3.3#TRPBF LT3015Q-3.3 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-5#PBF LT3015EQ-5#TRPBF LT3015Q-5 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-5#PBF LT3015IQ-5#TRPBF LT3015Q-5 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-5#PBF LT3015MPQ-5#TRPBF LT3015Q-5 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-12#PBF LT3015EQ-12#TRPBF LT3015Q-12 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-12#PBF LT3015IQ-12#TRPBF LT3015Q-12 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-12#PBF LT3015MPQ-12#TRPBF LT3015Q-12 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015EQ-15#PBF LT3015EQ-15#TRPBF LT3015Q-15 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015IQ-15#PBF LT3015IQ-15#TRPBF LT3015Q-15 5-Lead Plastic DD-Pak –40°C to 125°C

LT3015MPQ-15#PBF LT3015MPQ-15#TRPBF LT3015Q-15 5-Lead Plastic DD-Pak –55°C to 125°C

LT3015ET#PBF LT3015ET#TRPBF LT3015T 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT#PBF LT3015IT#TRPBF LT3015T 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-2.5#PBF LT3015ET-2.5#TRPBF LT3015T-2.5 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-2.5#PBF LT3015IT-2.5#TRPBF LT3015T-2.5 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-3#PBF LT3015ET-3#TRPBF LT3015T-3 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-3#PBF LT3015IT-3#TRPBF LT3015T-3 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-3.3#PBF LT3015ET-3.3#TRPBF LT3015T-3.3 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-3.3#PBF LT3015IT-3.3#TRPBF LT3015T-3.3 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-5#PBF LT3015ET-5#TRPBF LT3015T-5 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-5#PBF LT3015IT-5#TRPBF LT3015T-5 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-12#PBF LT3015ET-12#TRPBF LT3015T-12 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-12#PBF LT3015IT-12#TRPBF LT3015T-12 5-Lead Plastic TO-220 –40°C to 125°C

LT3015ET-15#PBF LT3015ET-15#TRPBF LT3015T-15 5-Lead Plastic TO-220 –40°C to 125°C

LT3015IT-15#PBF LT3015IT-15#TRPBF LT3015T-15 5-Lead Plastic TO-220 –40°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

LT3015 Series

3015fb

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum IN Pin Voltage

(Notes 2, 12) ILOAD = –0.5A

ILOAD = –1.5A

–1.8

–2.3 V

Regulated Output Voltage (Note 3) LT3015-2.5: VIN = –3.0V, ILOAD = –1mA

LT3015-2.5: –30V < VIN < –3.5V, –1.5A < ILOAD < –1mA

LT3015-3: VIN = –3.5, ILOAD = –1mA

LT3015-3: –30V < VIN < –4 V, –1.5A < ILOAD < –1mA

LT3015-3.3: VIN = –3.8, ILOAD = –1mA

LT3015-3.3: –30V < VIN < –4.3V, –1.5A < ILOAD < –1mA

LT3015-5: VIN = –5.5, ILOAD = –1mA

LT3015-5: –30V < VIN < –6V, –1.5A < ILOAD < –1mA

LT3015-12: VIN = –12.5, ILOAD = –1mA

LT3015-12: –30V < VIN < –13V, –1.5A < ILOAD < –1mA

LT3015-15: VIN = –15.5, ILOAD = –1mA

LT3015-15: –30V < VIN < –16V, –1.5A < ILOAD < –1mA

–2.475

–2.45

–2.97

–2.94

–3.267

–3.234

–4.95

–4.9

–11.88

–11.76

–14.85

–14.7

–2.5

–3

–3.3

–5

–12

–15

–2.525

–2.55

–3.03

–3.06

–3.333

–3.366

–5.05

–5.1

–12.12

–12.24

–15.15

–15.3

ADJ Pin Voltage (Notes 2, 3) LT3015: VIN = –2.3V, ILOAD = –1mA

LT3015: –30V < VIN < –2.3V, –1.5A < ILOAD < –1mA

–1.208

–1.196 –1.22

–1.22 –1.232

–1.244 V

Line Regulation LT3015-2.5: ∆VIN = –3.0V to –30V, ILOAD = –1mA

LT3015-3: ∆VIN = –3.5V to –30V, ILOAD = –1mA

LT3015-3.3: ∆VIN = –3.8V to –30V, ILOAD = –1mA

LT3015-5: ∆VIN = –5.5V to –30V, ILOAD = –1mA

LT3015-12: ∆VIN = –12.5V to –30V, ILOAD = –1mA

LT3015-15: ∆VIN = –15.5V to –30V, ILOAD = –1mA

LT3015: ∆VIN = –2.3V to –30V, ILOAD = –1mA (Note 2)

4.5

5.5

2.5

Load Regulation LT3015-2.5: VIN = –3.5V, ∆ILOAD = –1mA to –1.5A

LT3015-2.5: VIN = –3.5V, ∆ILOAD = –1mA to –1.5A

LT3015-3: VIN = –4V, ∆ILOAD = –1mA to –1.5A

LT3015-3.3: VIN = –4.3V, ∆ILOAD = –1mA to –1.5A

LT3015-5: VIN = –6V, ∆ILOAD = –1mA to –1.5A

LT3015-12: VIN = –13V, ∆ILOAD = –1mA to –1.5A

LT3015-15: VIN = –16V, ∆ILOAD = –1mA to –1.5A

LT3015: VIN = –2.3V, ∆ILOAD = –1mA to –1.5A (Note 2)

5.5

7.5

10.5

3.8

Dropout Voltage

VIN = VOUT(NOMINAL) (Notes 4, 5) ILOAD = –1mA

ILOAD = –1mA

ILOAD = –100mA

ILOAD = –500mA (DFN/MSOP)

ILOAD = –500mA (DD-PAK/TO-220)

ILOAD = –1.5A (DFN/MSOP)

ILOAD = –1.5A (DD-PAK/TO-220)

0.055

0.1

0.17

0.2

0.31

0.41

0.095

0.16

0.24

0.23

0.32

0.27

0.39

0.5

0.51

0.68

GND Pin Current

VIN = VOUT(NOMINAL) (Notes 4, 6) ILOAD = 0mA

ILOAD = –1mA

ILOAD = –100mA

ILOAD = –500mA

ILOAD = –1.5A

1.1

1.15

2.9

9.5

2.4

2.5

Output Voltage Noise (Note 2) LT3015: COUT = 10µF, ILOAD = –1.5A, BW = 10Hz to 100kHz, VOUT = –1.22V 60 µVRMS

SENSE Pin Bias Current (Note 13) LT3015-2.5/-3/-3.3/-5/-12/-15 l70 100 130 µA

ELECTRICAL CHARACTERISTICS

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

LT3015 Series

3015fb

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3015 adjustable version is tested and specified for these

conditions with the ADJ pin connected to the OUT pin.

Note 3: Maximum junction temperature limits operating conditions. The

regulated output voltage specification does not apply for all possible

combinations of input voltage and output current, especially due to the

current limit foldback which starts to decrease current limit at about

|VIN– VOUT| = 8V. If operating at maximum output current, limit the input

voltage range. If operating at maximum input voltage, limit the output

current range.

Note 4: To satisfy minimum input voltage requirements, the LT3015 is

tested and specified for these conditions with an external resistor divider

(54.9k top, 49.9k bottom) for an output voltage of –2.56V. The external

resistor adds 25μA of DC load on the output.

Note 5: Dropout voltage is the minimum input-to-output voltage

differential needed to maintain regulation at a specified output current. In

dropout, the output voltage is: VIN + VDROPOUT.

Note 6: GND pin current is tested with VIN = VOUT(NOMINAL) and a current

source load. Therefore, the device is tested while operating in dropout.

This is the worst-case GND pin current. GND pin current decreases slightly

at higher input voltages.

Note 7: Positive ADJ pin bias current flows into the ADJ pin.

ELECTRICAL CHARACTERISTICS

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

Note 8: Positive SHDN pin current flows into the SHDN pin.

Note 9: The LT3015 is tested and specified under pulsed load conditions

such that TJ ≅ TA. The LT3015E is guaranteed to meet performance

specifications from 0°C to 125°C junction temperature. Specifications over

the –40°C to 125°C operating temperature range are assured by design,

characterization, and correlation with statistical process controls. The

LT3015I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3015MP is 100% tested and guaranteed over

the full –55°C to 125°C operating junction temperature range.

Note 10: Parasitic diodes exist internally between the OUT, ADJ, SHDN

pins and the IN pin. Do not drive the OUT, ADJ, and SHDN pins more that

0.3V below the IN pin during fault conditions, and these pins must remain

at a voltage more positive than IN during normal operation.

Note 11: The SHDN threshold must be met to ensure device operation.

Note 12: For LT3015, the minimum input voltage refers to the lowest

input voltage before the parts goes out of regulation. For the fixed voltage

versions of LT3015, the minimum input voltage refers to the lowest input

voltage before the part can no longer sink 1.5A; for proper regulation, the

dropout voltage requirements must be met.

Note 13: Sense pin current flows out of the pin.

Note 14: The current limit circuit incorporates foldback that decreases

current limit for |VIN – VOUT| ≥ 8V. Some level of output current is

provided at all VIN – VOUT differential voltages. Please consult the Typical

Performance Characteristics graph for Current Limit vs VIN – VOUT.

PARAMETER CONDITIONS MIN TYP MAX UNITS

ADJ Pin Bias Current (Notes 2, 7) LT3015: VIN = –2.3V –200 30 200 nA

Shutdown Threshold (Note 11) VOUT = Off-to-On (Positive)

VOUT = Off-to-On (Negative)

VOUT = On-to-Off (Positive)

VOUT = On-to-Off (Negative)

1.07

–1.34

0.5

1.21

–1.2

0.73

–0.73

1.35

–1.06

–0.5

SHDN Pin Current (Note 8) VSHDN = 0V

VSHDN = 15V

VSHDN = –15V

–1 0

–2.8

–4.5

µA

Quiescent Current in Shutdown VIN = –6V, VSHDN = 0V l0.01 6 µA

Ripple Rejection

VRIPPLE = 0.5VP-P,

fRIPPLE = 120Hz,

ILOAD = –1.5A

LT3015-2.5: VIN = –4V (Avg)

LT3015-3: VIN = –4.5V (Avg)

LT3015-3.3: VIN = –4.8V (Avg)

LT3015-5: VIN = –6.5V (Avg)

LT3015-12: VIN = –13.5V (Avg)

LT3015-15: VIN = –16.5V (Avg)

LT3015: VIN = –2.5V (Avg) (Note 2)

Current Limit (Note 14) VIN = –2.3V, VOUT = 0V

LT3015-2.5/-3/-3.3/-5/-12/-15: VIN = VOUT(NOMINAL) – 1V, ∆VOUT = –5%

LT3015: VIN = –2.3V, ∆VOUT = 0.1V

1.7

2.3

Input Reverse Leakage Current LT3015-2.5/-3/-3.3/-5/-12/-15: VIN = 30V, VOUT, VADJ, VSHDN = Open Circuit l4 5.5 mA

LT3015: VIN = 30V, VOUT, VADJ, VSHDN = Open Circuit l1.55 1.7 mA

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

Typical Dropout Voltage

(DD-PAK/TO-220)

Guaranteed Dropout Voltage

(DD-PAK/TO-220) Dropout Voltage (DD-PAK/TO-220)

Quiescent Current LT3015 ADJ Pin Voltage LT3015-2.5 Output Voltage

TA = 25°C, unless otherwise noted.

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

400

500

300

200

100

600

–0.8 –1 –1.2 –1.4 –1.6–0.2 –0.4

3015 G04

–0.6

–55°C

–40°C

25°C

125°C

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

500

600

700

400

300

200

100

800

–0.8 –1 –1.2 –1.4 –1.6–0.2 –0.4

3015 G05

–0.6

= TEST POINTS

TJ ≤ 25°C

TJ ≤ 125°C

TEMPERATURE (°C)

–75

DROPOUT VOLTAGE (mV)

400

300

200

100

600

500

75 100 125 150 1750–25–50 25

3015 G06

IL = –1.5A

IL = –0.5A

IL = –0.1A

IL = –1mA

TEMPERATURE (°C)

–75

QUIESCENT CURRENT (mA)

–1.0

–0.8

–0.6

–0.4

–0.2

–1.4

–1.2

75 100 125 150 1750–25–50 25

3015 G07

LT3015

LT3015-2.5/-3/-3.3/-5/-12/-15

VIN = –6V (LT3015/-2.5/-3/-3.3/-5)

VIN = –16V (LT3015-12/-15)

RL = 120kΩ, IL = –10µA (LT3015)

RL = ∞, IL = –0µA

(LT3015-2.5/-3/-3.3/-5/-12/-15)

VSHDN = 0V

TEMPERATURE (°C)

–75

–1.192

ADJ PIN VOLTAGE (V)

–1.226

–1.232

–1.220

–1.214

–1.208

–1.202

–1.196

–1.244

–1.238

75 100 125 150 1750–25–50 25

3015 G08

VIN = –2.3V

IL = –1mA

TEMPERATURE (°C)

–75

–2.45

OUTPUT VOLTAGE (V)

–2.51

–2.53

–2.52

–2.54

–2.50

–2.49

–2.48

–2.47

–2.46

–2.55

75 100 125 150 1750–25–50 25

3015 G09

VIN = –3V

IL = –1mA

Typical Dropout Voltage

(DFN/MSOP)

Guaranteed Dropout Voltage

(DFN/MSOP) Dropout Voltage (DFN/MSOP)

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

400

350

300

250

200

150

100

450

–0.8 –1 –1.2 –1.4 –1.6–0.2 –0.4

3015 G01

–0.6

–55°C

–40°C

25°C

125°C

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

500

400

300

200

100

600

–0.8 –1 –1.2 –1.4 –1.6–0.2 –0.4

3015 G02

–0.6

TJ ≤ 25°C

TJ ≤ 125°C

= TEST POINTS

TEMPERATURE (°C)

–75

DROPOUT VOLTAGE (mV)

400

450

300

350

200

250

100

150

500

75 100 125 150 1750–25–50 25

3015 G03

IL = –1.5A

IL = –0.5A

IL = –0.1A

IL = –1mA

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

LT3015-3.3 Quiescent Current

LT3015-12 Output Voltage LT3015 Quiescent CurrentLT3015-15 Output Voltage

LT3015-2.5 Quiescent Current LT3015-3 Quiescent Current

TA = 25°C, unless otherwise noted.

TEMPERATURE (°C)

–75

–11.76

–11.80

OUTPUT VOLTAGE (V)

–12.08

–12.16

–12.12

–12.20

–12.04

–12.02

–12.00

–11.96

–11.88

–11.84

–11.92

–12.24

75 100 125 150 1750–25–50 25

3015 G13

VIN = –12.5V

IL = –1mA

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–1.0

–0.8

–0.6

–0.4

–0.2

–1.2

–6 –7 –8 –9 –10–3–2–1 –4

3015 G15

–5

VSHDN = VIN

TJ = 25°C

VOUT = –1.22V

RL = 121kΩ

VSHDN = 0V

TEMPERATURE (°C)

–75

–14.70

–14.75

–14.80

OUTPUT VOLTAGE (V)

–15.10

–15.20

–15.15

–15.25

–15.05

–15.00

–14.95

–14.90

–14.85

–15.30

75 100 125 150 1750–25–50 25

3015 G14

VIN = –15.5V

IL = –1mA

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.0

–1.6

–1.2

–0.8

–0.4

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G16

–15

VSHDN = VIN

TJ = 25°C

VOUT = –2.5V

RL = ∞

VSHDN = 0V

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.1

–1.8

–1.2

–0.9

–0.6

–1.5

–0.3

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G17

–15

VSHDN = VIN

TJ = 25°C

VOUT = –3V

RL = ∞

VSHDN = 0V

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.1

–1.8

–1.2

–0.9

–0.6

–1.5

–0.3

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G18

–15

VSHDN = VIN

TJ = 25°C

VOUT = –3.3V

RL = ∞

VSHDN = 0V

LT3015-3 Output Voltage LT3015-3.3 Output Voltage LT3015-5 Output Voltage

TEMPERATURE (°C)

–75

–2.940

OUTPUT VOLTAGE (V)

–3.012

–3.036

–3.024

–3.048

–3.000

–2.988

–2.976

–2.964

–2.952

–3.060

75 100 125 150 1750–25–50 25

3015 G10

VIN = –3.5V

IL = –1mA

TEMPERATURE (°C)

–75

–3.234

–3.246

OUTPUT VOLTAGE (V)

–3.318

–3.342

–3.330

–3.354

–3.306

–3.294

–3.282

–3.270

–3.258

–3.366

75 100 125 150 1750–25–50 25

3015 G11

VIN = –3.8V

IL = –1mA

TEMPERATURE (°C)

–75

–4.90

OUTPUT VOLTAGE (V)

–5.02

–5.06

–5.04

–5.08

–5.00

–4.98

–4.96

–4.94

–4.92

–5.10

75 100 125 150 1750–25–50 25

3015 G12

VIN = –5.5V

IL = –1mA

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

LT3015-2.5 GND Pin Current LT3015-3 GND Pin Current

LT3015-3.3 GND Pin Current LT3015-5 GND Pin Current LT3015-12 GND Pin Current

LT3015 GND Pin Current

TA = 25°C, unless otherwise noted.

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–20

–15

–10

–5

–25

–6 –7 –8 –9 –10–3–2–1 –4

3015 G22

–5

RL = 1.2kΩ

IL = –1mA*

RL = 2.4Ω

IL = –0.5A*

RL = 0.81Ω

IL = –1.5A*

RL = 12Ω

IL = –0.1A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –1.22V

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–6 –7 –8 –9 –10–3–2–1 –4

3015 G23

–5

RL = 2.5kΩ

IL = –1mA*

RL = 5Ω

IL = –0.5A*

RL = 1.67Ω

IL = –1.5A*

RL = 25Ω

IL = –0.1A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –2.5V

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–6 –7 –8 –9 –10–3–2–1 –4

3015 G24

–5

RL = 3kΩ

IL = –1mA*

RL = 6Ω

IL = –0.5A*

RL = 2Ω

IL = –1.5A*

RL = 30Ω

IL = –0.1A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –3V

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–6 –7 –8 –9 –10–3–2–1 –4

3015 G25

–5

RL = 3.3kΩ

IL = –1mA*

RL = 6.6Ω

IL = –0.5A*

RL = 2.2Ω

IL = –1.5A*

RL = 33Ω

IL = –0.1A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –3.3V

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–6 –7 –8 –9 –10–3–2–1 –4

3015 G26

–5

RL = 5kΩ

IL = –1mA*

RL = 10Ω

IL = –0.5A*

RL = 3.33Ω

IL = –1.5A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –5V

RL = 50Ω

IL = –0.1A*

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–12 –14 –16 –18 –20–6–4–2 –8

3015 G27

–10

RL = 12kΩ

IL = –1mA*

RL = 24Ω

IL = –0.5A*

RL = 8Ω

IL = –1.5A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –12V

RL = 120Ω

IL = –0.1A*

LT3015-5 Quiescent Current LT3015-12 Quiescent Current LT3015-15 Quiescent Current

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.1

–1.8

–1.2

–0.9

–0.6

–1.5

–0.3

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G19

–15

VSHDN = VIN

TJ = 25°C

VOUT = –5V

RL = ∞

VSHDN = 0V

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.1

–1.8

–1.2

–0.9

–0.6

–1.5

–0.3

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G20

–15

VSHDN = VIN

TJ = 25°C

VOUT = –12V

RL = ∞

VSHDN = 0V

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

–2.1

–1.8

–1.2

–0.9

–0.6

–1.5

–0.3

–2.4

–18 –21 –24 –27 –30–9–6–3 –12

3015 G21

–15

VSHDN = VIN

TJ = 25°C

VOUT = –15V

RL = ∞

VSHDN = 0V

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

ADJ Pin Bias Current ADJ Pin Bias Current Line Regulation

TA = 25°C, unless otherwise noted.

TEMPERATURE (°C)

–75

–200

ADJ PIN BIAS CURRENT (nA)

150

100

–50

–100

–150

200

75 100 125 150 175–25–50 0 25

3015 G34

VIN = –2.3V

POSITIVE CURRENT FLOWS

INTO THE PIN

INPUT VOLTAGE (V)

ADJ PIN BIAS CURRENT (nA)

–18 –21 –24 –27 –30–6–3 –9 –12

3015 G35

–15

TJ = 25°C

POSITIVE CURRENT FLOWS

INTO THE PIN

TEMPERATURE (°C)

–75

0.0

LINE REGULATION (mV)

–5.0

–7.5

–10.0

–12.5

–15.0

–17.5

–2.5

–20.0

75 100 125 150 175–25–50 0 25

3015 G36

∆VIN = VOUT(NOMINAL) –0.5V TO –30V

(LT3015-2.5/-3/-3.3/-5/-12/-15)

∆VIN = –2.3V TO –30V (LT3015)

IL = –1mA

LT3015

LT3015-2.5

LT3015-3

LT3015-3.3

LT3015-5

LT3015-12

LT3015-15

Negative SHDN Pin Thresholds SHDN Pin Input Current SHDN Pin Input Current

TEMPERATURE (°C)

–75

NEGATIVE SHDN PIN THRESHOLD (V)

–1.2

–1.0

–0.8

–0.6

–0.4

–0.2

–1.4

75 100 125 150 1750–25–50 25

3015 G31

TURN OFF THRESHOLD

TURN ON THRESHOLD

VIN = –2.3V

SHDN PIN VOLTAGE (V)

–30

–10

SHDN PIN CURRENT (µA)

–5

5 10 15 20 25–15–20–25 –10 –5

3015 G32

–55°C

25°C

125°C

VIN = –30V

POSITIVE CURRENT FLOWS

INTO THE PIN

TEMPERATURE (°C)

–75

–6

SHDN PIN CURRENT (µA)

–3

75 100 125 150 175–25–50 0 25

3015 G33

VIN = –15V

POSITIVE CURRENT FLOWS

INTO THE PIN

VSHDN = –15V

VSHDN = 15V

GND Pin Current vs ILOAD Positive SHDN Pin Thresholds

LT3015-15 GND Pin Current

TJ = –55°C

TJ = –40°C

TJ = 25°C

TJ = 125°C

OUTPUT CURRENT (A)

0.0

GND PIN CURRENT (mA)

–30

–25

–20

–15

–10

–5

–35

–0.8 –1.0 –1.2 –1.4 –1.6–0.2 –0.4

3015 G29

–0.6

VIN = –2.3V

VOUT = –1.22V

TEMPERATURE (°C)

–75

0.0

POSITIVE SHDN PIN THRESHOLD (V)

1.2

1.0

0.8

0.6

0.2

0.4

1.4

75 100 125 150 1750–25–50 25

3015 G30

VIN = –2.3V

TURN ON THRESHOLD

TURN OFF THRESHOLD

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

–45

–30

–25

–20

–15

–5

–10

–50

–35

–40

–12 –14 –16 –18 –20–6–4–2 –8

3015 G28

–10

RL = 30Ω

IL = –0.5A*

RL = 10Ω

IL = –1.5A*

TJ = 25°C

VSHDN = VIN

*FOR VOUT = –15V

RL = 150Ω

IL = –0.1A*

RL = 15kΩ

IL = –1mA*

LT3015 Series

3015fb

Load Regulation Current Limit vs VIN –VOUT Current Limit vs Temperature

TEMPERATURE (°C)

–75

LOAD REGULATION (mV)

–20

–30

–40

–50

–60

–70

–10

–80

75 100 125 150 175–25–50 0 25

3015 G37

LT3015

LT3015-2.5

LT3015-3

LT3015-3.3

LT3015-5

LT3015-12

LT3015-15

VIN = VOUT(NOMINAL) –1V

(LT3015-2.5/-3/-3.3/-5/-12/-15)

VIN = –2.3V (LT3015)

∆IL = –1mA TO –1.5A

INPUT/OUTPUT DIFFERENTIAL (V)

0.0

CURRENT LIMIT (A)

–0.4

–0.6

–0.8

–1.0

–1.2

–1.4

–1.6

–1.8

–2.0

–0.2

–2.2

–20 –25 –30–10–5 –15

3015 G38

VOUT = 0V

–55°C

25°C

125°C

TEMPERATURE (°C)

–75

0.0

CURRENT LIMIT (A)

–0.4

–0.6

–0.8

–1.0

–1.2

–1.4

–1.6

–1.8

–2.0

–0.2

–2.2

75 100 125 150 175–25–50 0 25

3015 G39

VIN = –2.3V

VOUT = 0V

LT3015 Input Ripple Rejection LT3015 Input Ripple Rejection Ripple Rejection vs Temperature

FREQUENCY (Hz)

RIPPLE REJECTION (dB)

10M100 1k 10k 100k 1M

3015 G40

TJ = 25°C

IL = –1.5A

VOUT = –1.22V

VIN = –2.7V + 50VRMS RIPPLE

COUT = 47µF

COUT = 10µF

FREQUENCY (Hz)

RIPPLE REJECTION (dB)

10M100 1k 10k 100k 1M

3015 G41

TJ = 25°C

IL = –1.5A

VOUT = –5V

VIN = –6.5V + 50VRMS RIPPLE

COUT = 10µF, CFF = 0

COUT = 10µF, CFF = 10nF

COUT = 47µF, CFF = 10nF

TEMPERATURE (°C)

–75

RIPPLE REJECTION (dB)

75 100 125 150 175–25–50 0 25

3015 G42

IL = –1.5A

VOUT = –1.22V

VIN = –2.7V + 0.5VP-P RIPPLE AT f = 120Hz

Minimum Input Voltage Output Noise Spectral Density

RMS Output Noise

vs Load Current

TEMPERATURE (°C)

–75

MINIMUM INPUT VOLTAGE (V)

–1.0

–0.8

–0.6

–0.4

–0.2

–1.2

–1.4

–1.6

–1.8

–2.0

–2.2

75 100 125 150 175–25–50 0 25

3015 G43

IL = –1mA

VSHDN = VIN

IL = –1.5A

FREQUENCY (Hz)

10 100 1k 10k

0.1

OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)

100k

3015 G44

COUT = 10µF

IL = –1.5A

IFB-DIVIDER = 100µA

VOUT = –5V

CFF = 10nF

VOUT = –1.22V

VOUT = –5V

CFF = 0

LT3015

LT3015-2.5

LT3015-5

LT3015-12

LT3015-15

LOAD CURRENT (A)

–1m –10m –100m

OUTPUT NOISE (µVRMS)

150

100

550

250

200

300

450

400

350

500

–1

3015 G45

COUT = 10µF

f = 10Hz TO 100kHz

IFB-DIVIDER = 100µA

NOISE AT VOUT = –1.22V

NOISE AT VOUT = –5V, CFF = 0

NOISE AT VOUT = –5V, CFF = 100pF

NOISE AT VOUT = –5V, CFF = 1nF

NOISE AT VOUT = –5V, CFF = 10nF

LT3015-2.5

LT3015-12

LT3015-15

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.

LT3015 10Hz to 100kHz Output

Noise, CFF = 10nF

VOUT

200µV/DIV

COUT = 10µF

VOUT = –5V

IL = –1.5A

CFF = 10nF

3015 G49

1ms/DIV

SHDN Transient Response,

IL = –5mA, CFF = 0

SHDN Transient Response,

IL = –1.5A, CFF = 0

VSHDN

1V/DIV

VOUT

2V/DIV

RL = 1kΩ

COUT = 10µF

VOUT = –5V

CFF = 0

3015 G50

25ms/DIV

VSHDN

1V/DIV

VOUT

2V/DIV

RL = 3.3Ω

COUT = 10µF

VOUT = –5V

CFF = 0

3015 G51

250µs/DIV

Start-Up Time vs CFF

LT3015 Transient Response,

COUT = 10µF

FEEDFORWARD CAPACITOR, CFF (F)

100p 1n 10n

0.001

0.01

0.1

1.0

START-UP TIME (mS)

100

100n

3015 G53

IL = –1.5A

IFB-DIVIDER = 100µA

TJ = 25°C

VOUT = –1.22V

VOUT = –5V

VOUT = –3V

VOUT = –12V

VOUT = –15V VOUT

100mV/DIV

IOUT

1A/DIV

COUT = 10µF

VOUT = –1.22V

VIN = –3V

∆IOUT = –50mA TO –1.5A

3015 G54

25µs/DIV

SHDN Transient Response,

IL = –1.5A, CFF = 10nF

VSHDN

1V/DIV

VOUT

2V/DIV

RL = 3.3Ω

COUT = 10µF

VOUT = –5V

CFF = 10nF

3015 G52

250µs/DIV

RMS Output Noise

vs Feedforward Capacitor (CFF)

LT3015 10Hz to 100kHz Output

Noise

LT3015 10Hz to 100kHz Output

Noise, CFF = 0

FEEDFORWARD CAPACITANCE, CFF (F)

10p 100p 1n 10n 100n

100

OUTPUT NOISE (µV

RMS

)

125

150

175

200

225

250

1µ

3015 G46

IL = –1.5A

COUT = 10µF

f = 10Hz TO 100kHz

IFB-DIVIDER = 100µA

TJ = 25°C

VOUT = –5V

VOUT = –1.22V

VOUT

100µV/DIV

COUT = 10µF

VOUT = –1.22V

IL = –1.5A

3015 G47

1ms/DIV

VOUT

200µV/DIV

COUT = 10µF

VOUT = –5V

IL = –1.5A

CFF = 0

3015 G48

1ms/DIV

LT3015 Series

3015fb

TYPICAL PERFORMANCE CHARACTERISTICS

LT3015 Transient Response,

COUT = 47µF

LT3015 Transient Response,

CFF = 0, COUT = 10µF

LT3015 Transient Response,

CFF = 10nF, COUT = 10µF LT3015 Transient Response,

CFF = 10nF, COUT = 47µF

TA = 25°C, unless otherwise noted.

VOUT

100mV/DIV

IOUT

1A/DIV

COUT = 47µF

VOUT = –1.22V

VIN = –3V

∆IOUT = –50mA TO –1.5A

3015 G55

25µs/DIV

VOUT

100mV/DIV

IOUT

1A/DIV

COUT = 10µF

VOUT = –5V

VIN = –6.5V

CFF = 0

IFB-DIVIDER = 100µA

∆IOUT = –50mA TO –1.5A

3015 G56

25µs/DIV

VOUT

100mV/DIV

IOUT

1A/DIV

COUT = 10µF

VOUT = –5V

VIN = –6.5V

CFF = 10nF

IFB-DIVIDER = 100µA

∆IOUT = –50mA TO –1.5A

3015 G57

25µs/DIV

VOUT

100mV/DIV

IOUT

1A/DIV

COUT = 47µF

VOUT = –5V

VIN = –6.5V

CFF = 10nF

IFB-DIVIDER = 100µA

∆IOUT = –50mA TO –1.5A

3015 G58

25µs/DIV

LT3015 Series

3015fb

PIN FUNCTIONS

IN (Pins 1, 2, Exposed Pad Pin 9 / 1, 2, 3, 4, Exposed

Pad Pin 13 / 3, Tab / 3, Tab ): Input. These pins supply

power to the regulator. The Tab of the DD-Pak, TO-220 and

the exposed backside pad of the DFN and MSOP packages

is an electrical connection to IN and to the device’s sub-

strate. For proper electrical and thermal performance, tie

all IN pins together and tie IN to the exposed backside or

Tab of the relevant package on the PCB. See the Applica-

tions Information Section for thermal considerations and

calculating junction temperature. The LT3015 requires

a bypass capacitor at IN. In general, a battery’s output

impedance rises with frequency, so include a bypass ca-

pacitor in battery powered applications. An input bypass

capacitor in the range of 1µF to 10µF generally suffices,

but applications with large load transients may require

higher input capacitance to prevent input supply droop

and prevent the regulator from entering dropout.

SHDN (Pin 3 / 5 / 1 / 1): Shutdown. Use the SHDN pin to

put the LT3015 into a micropower shutdown state. The

SHDN function is bi-directional, allowing use of either

positive or negative logic. The SHDN pin threshold volt-

ages are referenced to GND. The output of the LT3015 is

OFF if the SHDN pin is pulled typically within ±0.73V of

GND. Driving the SHDN pin typically more than ±1.21V

turns the LT3015 ON. Drive the SHDN pin with either a

logic gate or with open collector/drain logic using a pull-up

resistor. The resistor supplies the pull-up current of the

open collector/drain gate, typically several microamperes.

The typical SHDN pin current is 2.8µA out of the pin (for

negative logic) or 17µA into the pin (for positive logic). If

the SHDN function is unused, connect the SHDN pin to

VIN to turn the device ON. If the SHDN pin is floated, then

the LT3015 is OFF. A parasitic diode exists between SHDN

and IN of the LT3015. Therefore, do not drive the SHDN

pin more than 0.3V below IN during normal operation or

during a fault condition. The SHDN pin can also be used

to set a programmable undervoltage lockout (UVLO)

threshold for the regulator input supply.

GND (Pins 4, 5 / 6, 7 / 2 / 2): Ground. Tie all GND pin(s)

together and tie the bottom of the output voltage setting

resistor divider directly to the GND pin(s) for optimum

load regulation performance.

ADJ (Pin 6 / 8 / 4 / 4): Adjust. For the adjustable voltage

version, this pin is the error amplifier’s non-inverting input.

It has a typical bias current of 30nA that flows into the

pin. The ADJ pin reference voltage is –1.22V referred to

GND, and the output voltage range is –1.22V to –29.5V. A

parasitic substrate diode exists between ADJ and IN of the

LT3015. Therefore, do not drive ADJ more than 0.3V below

IN during normal operation or during a fault condition.

SENSE (Pin 6 / 8 / 4 / 4): Sense. For the fixed voltage ver-

sions of the LT3015 (LT3015-2.5/LT3015-3/LT3015-3.3/

LT3015-5/LT3015-12/LT3015-15), the SENSE pin connects

to the non-inverting input of the error amplifier through

an internal resistor divider network. Optimum regulation

is obtained when the SENSE pin is connected to the OUT

pin of the regulator. In critical applications, small voltage

drops are caused by the resistance (RP) of PCB traces

between the regulator and the load. These drops can be

eliminated by connecting the SENSE pin to the output at

the load as shown in Figure 1 (Kelvin Sense Connection).

Note that the voltage drop across the external PCB traces

will add to the dropout voltage of the regulator. The SENSE

pin bias current is 100µA at the nominal output voltage. A

parasitic diode exists between SENSE and IN of the LT3015.

Therefore, do not drive SENSE more than 0.3V below IN

during normal operation or during a fault condition.

OUT (Pins 7, 8 / 9, 10, 11, 12 / 5 / 5): Output. These

pins supply power to the load. Tie all OUT pins together

for best performance. Use a minimum output capacitor

of 10µF with an ESR less than 500mΩ to prevent oscil-

lations. Large load transient applications require larger

output capacitors to limit peak voltage transients. See

the Applications Information section for more information

on output capacitance. A parasitic substrate diode exists

between OUT and IN of the LT3015. Therefore, do not drive

OUT more than 0.3V below IN during normal operation or

during a fault condition.

(DFN/MSOP/Q/T)

Figure 1. Kelvin Sense Connection

GND

LT3015-XX

SENSE

OUT

SHDN

VIN

3015 F01

LOAD

LT3015 Series

3015fb

BLOCK DIAGRAM

–1.20V

1.21V VREF

–

ADJ

I LIMIT FOLDBACK

NPN DRIVER

BIAS CIRCUITRY

ADJ PIN BIAS CURRENT

COMPENSATION

QPOWER

3015 BD

VTH

RSNS

–

ERROR AMP

–

I LIMIT AMP

OUT

SHDN

GND

R2*

R1*

*SEE TABLE 1 FOR

NOMINAL VALUES

OF R1 AND R2

SENSE

The LT3015 series are 1.5A negative low dropout linear

regulators featuring precision current limit and precision

bi-directional shutdown. The device supplies up to 1.5A

of output load current at a typical dropout voltage of

310mV. Moreover, the low 1.1mA operating quiescent

current drops to less than 1µA in shutdown. In addition

to low quiescent current, the LT3015 incorporates several

protection features that make it ideal for battery powered

applications. In dual supply applications where the regu-

lator’s load is returned to a positive supply, OUT can be

pulled above GND by 30V and still allow the LT3015 to

start up and operate.

Adjustable Operation

The LT3015 adjustable version has an output voltage

range of –1.22V to –29.3V. Output voltage is set by the

ratio of two external resistors as shown in Figure 2. The

device regulates the output to maintain the ADJ pin voltage

to –1.22V referred to ground. The current in R1 equals

–1.22V/R1 and the current in R2 equals the current in R1

plus the ADJ pin bias current. The ADJ pin bias current,

30nA at 25°C, flows into the ADJ pin. Calculate the output

voltage using the formula shown in Figure 1. The value

of R1 should be less than 50k to minimize errors in the

output voltage created by the ADJ pin bias current. Note

that in shutdown, the output is off and the divider current

APPLICATIONS INFORMATION

is zero. Curves of ADJ Pin Voltage vs Temperature, ADJ

Pin Bias Current vs Temperature and ADJ Pin Bias Cur-

rent vs Input Voltage appear in the Typical Performance

Characteristics section.

The adjustable device is tested and specified with the

ADJ pin tied to the OUT pin for a –1.22V output voltage.

Specifications for output voltages greater than –1.22V are

proportional to the ratio of the desired VOUT to –1.22V

(VOUT/–1.22V). For example, load regulation for an out-

put current change of –1mA to –1.5A is typically 2mV at

VOUT = –1.22V. At VOUT = –5V, load regulation equals:

 (–5V/–1.22V)•(2mV)=8.2mV

GND

LT3015

ADJ

OUT

SHDN

IN VOUT

CIN

VIN

COUT

3015 F02

Figure 2. Adjustable Operation

VOUT =–1.22V 1+R2









+IADJ

( )

VADJ =–1.22V ANDIADJ =30nA AT 25°C

OUTPUT RANGE =–1.22 TO –29.5V

LT3015 Series

3015fb

APPLICATIONS INFORMATION

Table 1 shows 1% resistor divider values for some com-

mon output voltages with a resistor divider current of

approximately 100µA.

Table 1. Output Voltage Resistor Divider Values

VOUT

(V)

(kΩ)

–2.5 12.1 12.7

–3.0 12.1 17.8

–3.3 12.1 20.5

–5.0 12.1 37.4

–12.0 12.1 107

–15.0 12.4 140

Feedforward Capacitance: Output Voltage Noise,

Transient Performance, and PSRR

The LT3015 regulators provide low output voltage noise

over the 10Hz to 100kHz bandwidth while operating at

full load current. Output voltage noise is approximately

240nV/√Hz over this frequency while operating in unity-gain

configuration. For higher output voltages (using a resistor

divider), the output voltage noise gains up accordingly. To

lower the output voltage noise for higher output voltages,

include a feedforward capacitor (CFF) from VOUT to VADJ.

A good quality, low leakage, capacitor is recommended.

This capacitor bypasses the resistor divider network at high

frequencies; and hence, reduces the output noise. With

the use of a 10nF feedforward capacitor, the output noise

decreases from 220µVRMS to 70µVRMS when the output

voltage is set to –5V by a 100µA feedback resistor divider.

Higher values of output voltage noise are often measured

if care is not exercised with regard to circuit layout and

testing. Crosstalk from nearby traces induces unwanted

noise onto the LT3015’s output. Moreover, power supply

ripple rejection (PSRR) must also be considered, as the

LT3015 does not exhibit unlimited PSRR; and thus, a

small portion of the input noise propagates to the output.

Using a feedforward capacitor (CFF) from VOUT to VADJ has

the added benefit of improving transient response and PSRR

for output voltages greater than –1.22V. With no feedforward

capacitor, the response and settling times will increase as

the output voltage is raised above –1.22V. Use the equa-

tion in Figure 3 to determine the minimum value of CFF to

achieve a transient (and noise) performance that is similar

to –1.22V output voltage performance regardless of the

chosen output voltage (see Transient Response and Output

Noise in the Typical Performance Characteristics section).

It is important to note that the start-up time is affected by

the use of a feedforward capacitor. Start-up time is directly

proportional to the size of the feedforward capacitor and

the output voltage, and is inversely proportional to the

feedback resistor divider current. In particular, it slows

to 860µs with a 10nF feedforward capacitor and a 10µF

output capacitor for an output voltage set to –5V by a

100µA feedback resistor divider current.

GND

LT3015

ADJ

OUT

SHDN

IN VOUT

CIN

VIN

COUT

CFF

3015 F03

CFF ≥ 10nF/100µA • IFB-DIVIDER

IFB-DIVIDER = VOUT/(R1+R2)

Figure 3. Feedforward Capacitor for Fast Transient

Response, Low Noise, and High PSRR

Output Capacitance and Transient Performance

The LT3015 regulators are stable with a wide range of

output capacitors. The ESR of the output capacitor affects

stability, most notably with small capacitors. Use a mini-

mum output capacitor of 10µF with an ESR of 500mΩ or

less to prevent oscillations. The LT3015’s load transient

response is a function of output capacitance. Larger val-

ues of output capacitance decrease the peak deviations

and provide improved transient response for larger load

current changes.

Extra consideration must be given to the use of ceramic

capacitors. Ceramic capacitors are manufactured with a

variety of dielectrics, each with different behavior across

temperature and applied voltage. The most common

dielectrics used are specified with EIA temperature char-

acteristic codes of Z5U, Y5V, X5R, and X7R. The Z5U and

Y5V dielectrics are good for providing high capacitances

in a small package, but they tend to have strong voltage

and temperature coefficients as shown in Figures 4 and 5.

LT3015 Series

3015fb

Voltage and temperature coefficients are not the only

sources of problems. Some ceramic capacitors have a

piezoelectric response. A piezoelectric device generates

voltage across its terminals due to mechanical stress,

similar to the way a piezoelectric microphone works. For

a ceramic capacitor, the stress can be induced by vibra-

tions in the system or thermal transients. The resulting

voltages produced can cause appreciable amounts of

noise. A ceramic capacitor produced the trace in Figure 6

in response to light tapping from a pencil. Similar vibration

induced behavior can masquerade as increased output

voltage noise.

APPLICATIONS INFORMATION

When used with a 5V regulator, a 16V 10μF Y5V capacitor

can exhibit an effective value as low as 1μF to 2μF for the

DC bias voltage applied and over the operating temperature

range. The X5R and X7R dielectrics result in more stable

characteristics and are more suitable for use as the output

capacitor. The X7R type has better stability across tem-

perature, while the X5R is less expensive and is available in

higher values. Care still must be exercised when using X5R

and X7R capacitors; the X5R and X7R codes only specify

operating temperature range and maximum capacitance

change over temperature. Capacitance change due to DC

bias with X5R and X7R capacitors is better than Y5V and

Z5U capacitors, but can still be significant enough to drop

capacitor values below appropriate levels. Capacitor DC bias

characteristics tend to improve as component case size

increases, but expected capacitance at operating voltage

should be verified in situ for all applications.

VOUT

1mV/DIV

VOUT = –1.3V

COUT = 10µF

IL = 10µA

3015 F06

1ms/DIV

Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor

DC BIAS VOLTAGE (V)

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10µF

–100

CHANGE IN VALUE (%)

–80

642 810 12

3015 F04

–60

–40

X5R

Y5V

–20

Figure 4. Ceramic Capacitor DC Bias Characteristics

TEMPERATURE (°C)

–50

–100

CHANGE IN VALUE (%)

–80

250–25 50 75 100

3015 F05

–60

–40 Y5V

–20

125

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10µF

X5R

Figure 5. Ceramic Capacitor Temperature Characteristics

Overload Recovery

Like many IC power regulators, the LT3015 has safe oper-

ating area protection. The safe operating area protection

activates at IN-to-OUT differential voltages greater than

8V. The safe area protection decreases current limit as

the IN-to-OUT differential voltage increases and keeps

the power transistor inside a safe operating region for

all values of forward input-to-output voltage up to the

LT3015’s Absolute Maximum Ratings.

When power is first applied and input voltage rises, the

output follows the input and keeps the IN-to-OUT differential

voltage small, allowing the regulator to supply large output

currents and start-up into high current loads. With a high

input voltage, a problem can occur wherein removal of

an output short does not allow the output voltage to fully

recover. Other LTC negative linear regulators such as the

LT1175 and LT1964 also exhibit this phenomenon, so it

is not unique to the LT3015.

LT3015 Series

3015fb

APPLICATIONS INFORMATION

The problem occurs with a heavy output load when input

voltage is high and output voltage is low. Such situations

occur easily after the removal of a short-circuit or if the

shutdown pin is pulled high after the input voltage has

already been turned on. The load line for such a load

intersects the output current curve at two points. If this

happens, the regulator has two stable output operating

points. With this double intersection, the input power

supply may need to be cycled down to zero and brought

up again to make the output recover.

Shutdown/UVLO

The SHDN pin is used to put the LT3015 into a micro power

shutdown state. The LT3015 has an accurate –1.20V

threshold (during turn-on) on the SHDN pin. This threshold

can be used in conjunction with a resistor divider from the

system input supply to define an accurate undervoltage

lockout (UVLO) threshold for the regulator. The SHDN pin

current (at the threshold) needs to be considered when

determining the resistor divider network.

Thermal Considerations

The LT3015’s maximum rated junction temperature of

125°C limits its power handling capability. Two components

comprise the power dissipated by the device:

1. Output current multiplied by the input-to-output dif-

ferential voltage: IOUT•(VIN - VOUT) and

2. GND pin current multiplied by the input voltage:

IGND•VIN

Determine GND pin current using the GND Pin Current

curves in the Typical Performance Characteristics sec-

tion. Total power dissipation is the sum of the above two

components.

The LT3015 regulators incorporate a thermal shutdown

circuit designed to protect the device during overload

conditions. The typical thermal shutdown temperature is

165°C and the circuit incorporates about 8°C of hyster-

esis. For continuous normal conditions, do not exceed the

maximum junction temperature rating of 125°C. Carefully

consider all sources of thermal resistance from junction

to ambient, including other heat sources mounted in close

proximity to the LT3015.

The undersides of the DFN and MSOP packages have ex-

posed metal from the lead frame to the die attachment.

Both packages allow heat to directly transfer from the

die junction to the printed circuit board metal to control

maximum operating junction temperature. The dual-in-line

pin arrangement allows metal to extend beyond the ends

of the package on the topside (component side) of the

PCB. Connect this metal to IN on the PCB. The multiple

IN and OUT pins of the LT3015 also assist in spreading

heat to the PCB.

For surface mount devices, heat sinking is accomplished

by using the heat spreading capabilities of the PC board

and its copper traces. Copper board stiffeners and plated

through-holes can also be used to spread the heat gener-

ated by power devices.

Tables 2-4 list thermal resistance as a function of copper

area in a fixed board size. All measurements were taken

in still air on a 4 layer FR-4 board with 1oz solid internal

planes and 2oz top/bottom external trace planes with a total

board thickness of 1.6mm. The four layers were electrically

isolated with no thermal vias present. PCB layers, copper

weight, board layout and thermal vias will affect the resul-

tant thermal resistance. For more information on thermal

resistance and high thermal conductivity test boards,

refer to JEDEC standard JESD51, notably JESD51-12 and

JESD51-7. Achieving low thermal resistance necessitates

attention to detail and careful PCB layout.

LT3015 Series

3015fb

Table 2. Measured Thermal Resistance for DFN Package

COPPER AREA BOARD

AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOP SIDE* BACKSIDE

2500mm22500mm22500mm240°C/W

1000mm22500mm22500mm240°C/W

225mm22500mm22500mm241°C/W

100mm22500mm22500mm242°C/W

*Device is mounted on topside

Table 3. Measured Thermal Resistance for MSOP Package

COPPER AREA BOARD

AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOP SIDE* BACKSIDE

2500mm22500mm22500mm237°C/W

1000mm22500mm22500mm237°C/W

225mm22500mm22500mm238°C/W

100mm22500mm22500mm240°C/W

*Device is mounted on topside

Table 4. Measured Thermal Resistance for DD-Pak Package

COPPER AREA BOARD

AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)TOP SIDE* BACKSIDE

2500mm22500mm22500mm214°C/W

1000mm22500mm22500mm216°C/W

225mm22500mm22500mm219°C/W

*Device is mounted on topside

T Package, 5-Lead TO-220

Thermal Resistance (Junction-to-Case) = 3°C/W

Calculating Junction Temperature

Example: Given an output voltage of –2.5V, an input voltage

range of –3.3V ± 5%, an output current range of 1mA to

500mA, and a maximum ambient temperature of 85°C,

what is the maximum junction temperature?

The power dissipated by the LT3015 equals:

IOUT(MAX)•(VIN(MAX) - VOUT) + IGND•(VIN(MAX))

where:

IOUT(MAX) = –500mA

VIN(MAX) = –3.465V

IGND at (IOUT = –500mA, VIN = –3.465V) = –6.5mA

APPLICATIONS INFORMATION

Thus:

 P=–500mA(–3.465V+2.5V)+–6.5mA•(–3.465V)=

0.505W

Using a DFN package, the thermal resistance is in the

range of 40°C/W to 42°C/W depending on the copper area.

Therefore, the junction temperature rise above ambient

approximately equals:

 0.505W•41°C/W=20.7°C

The maximum junction temperature equals the maxi-

mum ambient temperature plus the maximum junction

temperature rise above ambient or:

TJMAX = 85°C + 20.7°C = 105.7°C

Protection Features

The LT3015 incorporates several protection features that

make it ideal for use in battery-powered applications. In

addition to the normal protection features associated

with monolithic regulators, such as current limiting and

thermal limiting, the device protects itself against reverse

input voltages and reverse output voltages.

Precision current limit and thermal overload protections

are intended to protect the LT3015 against current over-

load conditions at the output of the device. For normal

operation, do not allow the the junction temperature to

exceed 125°C.

Pulling the LT3015’s output above ground induces no

damage to the part. If IN is left open circuit or grounded,

OUT can be pulled above GND by 30V. In addition, OUT acts

like an open circuit, i.e. no current flows into the pin. If IN

is powered by a voltage source, OUT sinks the LT3105’s

short-circuit current and protects itself by thermal limiting.

In this case, grounding the SHDN pin turns off the device

and stops OUT from sinking the short-circuit current.

LT3015 Series

3015fb

TYPICAL APPLICATIONS

Adjustable Current Sink

GND

LT3015

ADJ

OUT

SHDN

VIN < –2.3V

LT1004-1.2

82.5k

0.01Ω

10µF

100k

10µF

475Ω

1µF

2.2k

3.3µF

NOTE: ADJUST R3 FOR 0 TO –1.5A CONSTANT CURRENT

3015 TA04

RLOAD

2.2k

–

1/2

LT1350

LT3015 Series

3015fb

PACKAGE DESCRIPTION

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

3.00 ±0.10

(4 SIDES)

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON TOP AND BOTTOM OF PACKAGE

0.40 ±0.10

BOTTOM VIEW—EXPOSED PAD

1.65 ±0.10

(2 SIDES)

0.75 ±0.05

R = 0.125

TYP

2.38 ±0.10

PIN 1

TOP MARK

(NOTE 6)

0.200 REF

0.00 – 0.05

(DD8) DFN 0509 REV C

0.25 ±0.05

2.38 ±0.05

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED

1.65 ±0.05

(2 SIDES)2.10 ±0.05

0.50

BSC

0.70 ±0.05

3.5 ±0.05

PACKAGE

OUTLINE

0.25 ±0.05

0.50 BSC

DD Package

8-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1698 Rev C)

LT3015 Series

3015fb

PACKAGE DESCRIPTION

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

MSOP (MSE12) 0911 REV F

0.53 ±0.152

(.021 ±.006)

SEATING

PLANE

0.18

(.007)

1.10

(.043)

MAX

0.22 –0.38

(.009 – .015)

TYP

0.86

(.034)

REF

0.650

(.0256)

BSC

12 11 10 9 8 7

DETAIL “B”

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

6. EXPOSED PAD DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH ON E-PAD SHALL

NOT EXCEED 0.254mm (.010") PER SIDE.

0.254

(.010) 0° – 6° TYP

DETAIL “A”

GAUGE PLANE

RECOMMENDED SOLDER PAD LAYOUT

BOTTOM VIEW OF

EXPOSED PAD OPTION

2.845 ±0.102

(.112 ±.004)

2.845 ±0.102

(.112 ±.004)

4.039 ±0.102

(.159 ±.004)

(NOTE 3)

1.651 ±0.102

(.065 ±.004)

1.651 ±0.102

(.065 ±.004)

0.1016 ±0.0508

(.004 ±.002)

1 2 3 4 5 6

3.00 ±0.102

(.118 ±.004)

(NOTE 4)

0.406 ±0.076

(.016 ±.003)

REF

4.90 ±0.152

(.193 ±.006)

DETAIL “B”

CORNER TAIL IS PART OF

THE LEADFRAME FEATURE.

FOR REFERENCE ONLY

NO MEASUREMENT PURPOSE

0.12 REF

0.35

REF

5.23

(.206)

MIN

3.20 – 3.45

(.126 – .136)

0.889 ±0.127

(.035 ±.005)

0.42 ±0.038

(.0165 ±.0015)

TYP

0.65

(.0256)

BSC

MSE Package

12-Lead Plastic MSOP, Exposed Die Pad

(Reference LTC DWG # 05-08-1666 Rev F)

LT3015 Series

3015fb

PACKAGE DESCRIPTION

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

Q(DD5) 0811 REV F

.028 – .038

(0.711 – 0.965)

TYP

.143 +.012

–.020

( )

3.632+0.305

–0.508

.067

(1.702)

BSC

.013 – .023

(0.330 – 0.584)

.095 – .115

(2.413 – 2.921)

.004 +.008

–.004

( )

0.102+0.203

–0.102

.050 ±.012

(1.270 ±0.305)

.059

(1.499)

TYP

.045 – .055

(1.143 – 1.397)

.165 – .180

(4.191 – 4.572)

.330 – .370

(8.382 – 9.398)

.060

(1.524)

TYP

.390 – .415

(9.906 – 10.541)

15° TYP

.420

.350

.585

.090

.042

.067

RECOMMENDED SOLDER PAD LAYOUT

.325

.205

.080

.585

.090

RECOMMENDED SOLDER PAD LAYOUT

FOR THICKER SOLDER PASTE APPLICATIONS

.042

.067

.420

.276

.320

NOTE:

1. DIMENSIONS IN INCH/(MILLIMETER)

2. DRAWING NOT TO SCALE

.300

(7.620)

.075

(1.905)

.183

(4.648)

.060

(1.524)

.060

(1.524)

.256

(6.502)

BOTTOM VIEW OF DD PAK

HATCHED AREA IS SOLDER PLATED

COPPER HEAT SINK

Q Package

5-Lead Plastic DD Pak

(Reference LTC DWG # 05-08-1461 Rev F)

DETAIL A

0° – 7° TYP0° – 7° TYP

LT3015 Series

3015fb

PACKAGE DESCRIPTION

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

T5 (TO-220) 0801

.028 – .038

(0.711 – 0.965)

.067

(1.70) .135 – .165

(3.429 – 4.191)

.700 – .728

(17.78 – 18.491)

.045 – .055

(1.143 – 1.397)

.095 – .115

(2.413 – 2.921)

.013 – .023

(0.330 – 0.584)

.620

(15.75)

TYP

.155 – .195*

(3.937 – 4.953)

.152 – .202

(3.861 – 5.131)

.260 – .320

(6.60 – 8.13)

.165 – .180

(4.191 – 4.572)

.147 – .155

(3.734 – 3.937)

DIA

.390 – .415

(9.906 – 10.541)

.330 – .370

(8.382 – 9.398)

.460 – .500

(11.684 – 12.700)

.570 – .620

(14.478 – 15.748)

.230 – .270

(5.842 – 6.858)

BSC

SEATING PLANE

* MEASURED AT THE SEATING PLANE

T Package

5-Lead Plastic TO-220 (Standard)

(Reference LTC DWG # 05-08-1421)

LT3015 Series

3015fb

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER

A 12/11 Revised entire data sheet to include fixed output voltages. 1 - 26

B 4/12 Clarified conditions of “RMS Output Noise vs Load Current” graph 11

LT3015 Series

3015fb

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0412 REV B • PRINTED IN USA

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER DESCRIPTION COMMENTS

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LT3022 1A, Low Voltage, Very Low Dropout VLDO

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LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low

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3mm × 3mm DFN Packages; “–1” Version has Integrated Internal Ballast Resistor

LT3085 500mA, Parallelable, Low Noise,

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amp required), Stable with Ceramic Caps, MSOP-8E and 2mm × 3mm DFN Packages

LT3015

SHDN

ADJ

GND

LT3015

SHDN

ADJ

OUT

GND

0.01Ω

2.2k

VOUT

–5V

–3.0A

50k

0.01µF

VIN < –5.5V

–1/2

LT1366

3015 TA03

12.1k

37.4k

12.1k

41.2k

OUT

22µF

Paralleling Regulators For Higher Output Current