Rev. A/DX 2007
-
06
-
04
LM317
Adjustable Positive
Voltage Regulator
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Page 1
of 8
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-
TAITRON (800)
-
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-
8766 (661)
-
257
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Adustable Positive Voltage Regulator
General Description
• The LM317 is an adjustable 3-terminal positive voltage
regulator, designed to supply 1A of output current with
. voltage adjustable from 1.3V ~ 37V.
• The LM317 is available in SOT-223, D-PACK, TO-220
and D2-PACK packages.
Features Applications
• Output Voltage adjustable from 1.3V ~ 37V
• Output current in excess of 1A
• Internal short circuit protection
• Internal over temperature protection
• Output transistors safe area compensation
• RoHS Compliance
Ordering Information
SOT-223 D-PACK
(TO-252)
• PC Motherboard
• LCD Monitor
• Graphic Card
• DVD Player
• Network Interface Card/Switch
• Telecom Equipment
• Printer and other Peripheral Equipment
TO-220
D2-PACK
(TO-263)
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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Pin Configuration
Block Diagram
Outline: H
SOT-223
Outline: D
D-PACK
(
TO-252
)
Outline: T
TO-220
Outline: MC
D2-PACK
(
TO-263
)
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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Absolute Maximum Ratings (Ta=25° C, unless otherwise specified)
Symbol Description Ratings Unit
VIN-VOUT Input - Output Voltage Differential 40 V
IO Max. Output Current 1.0 A
TJ Operating Junction Temperature 125 ° C
TOPR Operating Temperature Range -40 ~ 85 ° C
TSTG Storage Temperature Range -40 ~ 150 ° C
PD Power Dissipation Internal limited mW
T: TO-220 5
MC: D2-PACK (TO-263) 5
D: D-PACK (TO-252) 12
RthJC Thermal Resistance
Junction-Case H: SOT-223 23
° C/W
T: TO-220 54
MC: D2-PACK (TO-263) 64
D: D-PACK (TO-252) 112
RthJA Thermal Resistance
Junction-Ambient H: SOT-223 165
° C/W
Note: Absolute maximum ratings are stress ratings only and functional device operation is not
implied. The device could be damaged beyond Absolute maximum ratings.
Electrical Characteristics
(VIN-VOUT=5V, IOUT=10mA, T
A
=25ºC, unless otherwise specified)
LM317
Symbol Description Min. Typ. Max. Unit Conditions
∆VOUT/VOUT Line Regulation - 0.01 0.04 %/V 3V≤VIN-VOUT≤40V
- 5 25 mV 10mA≤IOUT≤1A, VOUT≤5V
∆VOUT Load Regulation - 0.1 0.5 mV
10mA≤IOUT≤1A, VOUT≥5V
IADJ Adjustable Pin Current - 50 100 µA -
∆IADJ Adjustable Pin Current Change - 0.2 5 µA 3V≤VIN-VOUT≤40V,
10mA≤IOUT≤1A, PD≤20W
VREF Reference Input Voltage 1.20 1.25 1.30 V 3V≤VIN-VOUT≤40V,
10mA≤IOUT≤1A, PD≤20W
- Temperature Stability - 0.7 - %/VOUT TMIN≤TJ≤TMAX
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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Fig.1- Load Regulation vs. Temperature
Temperature (° C)
Fig.3- Current Limit
VIN-VOUT (V)
Fig.2- Adjustment Current vs. Temperature
Tem
erature
° C
)
LM317
Symbol Description Min. Typ. Max. Unit Conditions
IL(MIN) Minimum Load Current for
Regulation - 3.5 10 mA VIN-VOUT=40V
IO(MAX) Maximum Output Current 0.3 0.4 - A VIN-VOUT=40V, PD≤20W
eN RMS Noise vs. %of VOUT - 0.003 - %/VOUT 10Hz≤f≤10KHz
CADJ=0 - 65 -
RR Ripple
Rejection CADJ=10µF 66 80 - dB VOUT=10V, f=120Hz
Note: CADJ is connected between Adjust pin and Ground.
Typical Characteristics Curves
∆VOUT, Output Voltage Deviation (%)
Fig.4- Minimum Operating Current
VIN-VOUT (V)
IADJ, Adjustment Current (µA)
IOUT, Output Current (mA)
IOUT, Min. Output Current (mA)
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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Typical Application
Fig.5-Programmable Voltage Regulator
Fig.7- Soft Start Application Fig.8- Constant Current Application
Fig.6- Regulator with On-off Control
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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Dimensions in inches (mm)
SOT-223
D-PACK
(TO-252)
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
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04
LM317
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TO-220
D2-PACK
(TO-263)
Adjustable Positive Voltage Regulator
Rev. A/DX 2007
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06
-
04
LM317
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How to contact us:
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Email: taitron@taitroncomponents.com
Http://www.taitroncomponents.com
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