2000. 3.13
LOW NOISE 150mA LDO REGULATOR
R1122N SERIES
Rev. 1.1 0 - 1 -
n OUTLINE
The R1122N Series are voltage regulator ICs with high output voltage accuracy, extremely low supply current, low ON-
resistance and high ripple rejection by CMOS process. Each of these v oltage regulator ICs con sists of a voltage referen ce unit,
an error amplifier, resistors, a current limit circuit, and a chip enable circuit. T hese ICs perform with low dropout voltage and
a chip enable function.
The line trans ient respons e and load tran sient res ponse of the R1 122N Se ries are excell ent, t hus thes e ICs are very suita ble for
the power supply for hand-held communication equipment. The output voltage of these ICs is fixed with high accuracy.
Since the package for these ICs are SOT-23-5 (Mini-mold) package, high density mounting of the ICs on boards is possible.
n FEATURES
l Ultra-Low Supply Current.................................................TYP. 100mA
l Standby Mode ...................................................................TYP. 0.1mA
l Low Dropout Voltage........................................................TYP. 0.19V (IOUT = 100mA, 3V Output type)
l High Ripple Rejection.......................................................TYP. 80dB (f = 1kHz)
l Low Temperature-Drift Coefficient of Output Voltage .....TYP. ±100ppm/°C
l Excellent Line Regulation................................................. TYP. 0.05%/V
l High Accuracy Output Voltage..........................................±2.0%
l Small Package ..................................................................SOT-23-5 (Mini-mold)
l Output Voltage ..................................................................Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V
is possible.
l Built-in chip enable circuit (2 Types; A: active “L”, B: active “H”)
l Built-in Fold-back protection circuit.................................Short Current Typ. 30mA
l Pinout ................................................................................Similar to the TK112, TK111
l Ceramic Capacitors are Recomme ndable to be used with this IC.
n APPLICATIONS
l Power source for cellular phones such as GSM, CDMA, PCS and so forth.
l Power source for domestic appliances such as cameras, VCRs and camcorders.
l Power source for battery-powered equipment.
Rev. 1.1 0 - 2 -
n BLOCK DI AGR AM
R1122NXX1A R1122NXX1B
Vref
Current Limit
V
DD
31
24
V
OUT
GNDCE
Vref
Current Limit
V
DD
31
24
V
OUT
GNDCE
n SELECTION GUIDE
The output voltage, the active type, t he packing type, and the taping type for the ICs can be selected at the user's request.
The selection can be made by designating the part number as shown below :
R1122NXX1X-XX ¬Part Number
-- -
ab c
Code Contents
aSetting O utput Voltage (VOUT) :
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
bDesignation of Active Type :
A : active “L” type
B : active “H” type
cDesignation of Taping Type :
Ex. TR, TL (refer to Taping Specifications; TR type is the standard direction.)
Rev. 1.1 0 - 3 -
n PIN CONFIGURATION
SOT-23-5
54
NC CE
(mark side)
123
V
OUT
GND V
DD
n PIN DESCRIPTION
Pin No. Symbol Description
1V
OUT Output pin
2 GND Ground Pin
3V
DD Input Pin
4CE or CE Chip Enable Pin
5 NC No Connection
Rev. 1.1 0 - 4 -
n ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
VIN Input Voltage 7.0 V
VCE Input Voltage (CE or CE Pin) -0.3 ~ VIN+0.3 V
VOUT Output Voltage -0.3~ VIN+0.3 V
IOUT Output Current 200 mA
PDPower Dissipation 250 mW
Topt Operating Temperature
Range -40 ~ 85 °C
Tstg Storage Temperature Range -55 ~ 125 °C
n ELECTR ICAL CHARACTERIS TICS
l R1122NXX1A Topt = 25°C
Symbol Item Conditions MIN. TYP. MAX. Unit
VOUT Output Voltage VIN = Set VOUT+1V
1mA £ IOUT £ 30mA VOUT
´0.98 VOUT
´1.02 V
IOUT Output Current VIN = Set VOUT+1V
When VOUT = Set VOUT-0.1V 150 mA
DVOUT/DIOUT Load Regulation VIN = Set VOUT+1V
1mA £ IOUT £ 80mA 12 40 mV
VDIF Dropout Voltage refer to the ELECTICAL CHARACTERISTICS by OUTPUT
VOLTAGE
ISS Supply Current VIN = Set VOUT+1V 100 170 mA
Istandby Supply Current (Stand by) VIN = VCE = Set VOUT+1V 0.1 1.0 mA
DVOUT/DVIN Line Regulation Set VOUT+0.5V £ VIN £ 8V
IOUT = 30mA 0.05 0.20 %/V
RR Ripple Rejection f = 1KHz, Ripple 0.5Vp-p
VIN = Set VOUT+1V 80 dB
VIN Input Voltage 2.0 6.0 V
DVOUT/DTOutput Voltage
Temp erature Coe fficient IOUT = 30mA
-40°C £ Topt £ 85°C±100 ppm
/°C
Ilim Short Current Limit VOUT = 0V 30 mA
RPU CE Pull-up Resistance 2.5 5 10 MW
VCEH CE Input Voltage “H” 1.5 VIN V
VCEL CE Input Voltage “L” 0 0.25 V
en Output Noise BW = 10Hz ~ 100kHz 30 mVrms
Rev. 1.1 0 - 5 -
l R1122NXX1B Topt=25°C
Symbol Item Conditions MIN. TYP. MAX. Unit
VOUT Output Voltage VIN = Set VOUT+1V
1mA £ IOUT £ 30mA VOUT
´0.98 VOUT
´1.02 V
IOUT Output Current VIN = Set VOUT+1V
When VOUT = Set VOUT-0.1V 150 mA
DVOUT/DIOUT Load Regulation VIN = Set VOUT+1V
1mA £ IOUT £ 80mA 12 40 mV
VDIF Dropout Voltage refer to the ELECTICAL CHARACTE RISTICS by OUTPUT
VOLTAGE
ISS Supply Current VIN = Set VOUT+1V 100 170 mA
Istandby Supply Current (Stand by) VIN = Set VOUT+1V
VCE = GND 0.1 1.0 mA
DVOUT/DVIN Line Regulation Set VOUT+0.5V £ VIN £ 8V
IOUT = 30mA 0.05 0.20 %/V
RR Ripple Rejection f = 1KHz, Ripple 0.5Vp-p
VIN = Set VOUT+1V 80 dB
VIN Input Voltage 2.0 6.0 V
DVOUT/DTOutput Voltage
Temp erature Coe fficient IOUT = 30mA
-40°C £ Topt £ 85°C±100 ppm
/°C
Ilim Short Current Limit VOUT = 0V 30 mA
RPD CE Pull-down Resistance 2.5 5 10 MW
VCEH CE Input Voltage “H” 1.5 VIN V
VCEL CE Input Voltage “L” 0 0.25 V
en Output Noise BW = 10Hz ~ 100kHz 30 mVrms
l ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE Topt = 25°C
Dropout Voltage
VDIF (V)
Output Voltage
VOUT (V) Conditions TYP. MAX.
1.5 £ VOUT £ 1.6 0.32 0.55
1.7 £ VOUT £ 1.8 0.28 0.47
1.9 £ VOUT £ 2.3 0.25 0.35
2.4 £ VOUT £ 2.7 0.20 0.29
2.8 £ VOUT £ 5.0
IOUT = 100mA
0.19 0.26
Rev. 1.1 0 - 6 -
n OPERATION
R1122XX1A R1122XX1B
V
DD
31
24
V
OUT
GND
R2
R1
CE Current Limit
Vref
V
DD
31
24
V
OUT
GND
R2
R1
CE Current Limit
Vref
In these ICs, fluctuation o f Output Voltage, VOUT is detected by Feed-back Registers, R1 and R2, and the result is compared
with a reference volta ge by Error Amplifier, so that a constant vo ltage is output.
A current limit circuit for protection at short mode, and a chip enable circuit are included.
Rev. 1.1 0 - 7 -
n TEST CIRCUITS
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
I
OUT
IN OUT
GND
CE
0.1µF
2.2µF
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
I
SS
IN OUT
GND
CE
0.1µF
2.2µF
Fig.1 Standard test Circuit Fig.2 Supply Current Test Circuit
R1121Nxx1B Series
V
DD
1
3
P.G 2
4
V
OUT
I
OUT
IN OUT
GND
CE
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
IN OUT
GND I1 I2
CE
1µF
Fig.3 Ripple Rejection, Line Transient Response Test
Circuit Fig.4 Load Transient Response Test Circuit
2.2mF2.2mF
2.2mF
R1122Nxx1B
Series
R1122Nxx1B
Series
R1122Nxx1B
Series
R1122Nxx1B
Series
Rev. 1.1 0 - 8 -
n TECHNICAL NOTES
When using these ICs, consider the following points:
Phase Compensation
In these ICs, phase compensation is made for securing stable operation even i f the load current is varied. For this purpose, be
sure to use a capacitor COUT with good frequency c haracteristics and ESR (Equivalent Series Resistance).
(note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase com pensation,
the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the
PCB.)
Recommended Capacitors; GRM40X5R225K6.3 (Murata)
GRM40-034X5R335K6.3 (Murata)
GRM40-034X5R475K6.3 (Murata)
PCB Layout
Make VDD and GND line sufficient. When the impedance of these is high, it would be a cause of picking up the noise or
unstable operation. Connect a capacitor with a capacitance of 2.2mF or more between VDD and GND pin as close as possible.
Set external components, especially output capacitor as close as possible to the ICs and make wiring shortest.
Rev. 1.1 0 - 9 -
n TYPICAL APPLIC ATION
R1111NXX1A V
OUT
OUTIN V
DD
GND
CE
Cap.
Cap.
R1111Nxx1B V
OUT
OUTIN V
DD
GND
CE
Cap.
Cap.
(External Components)
Output Capacitor; Ceramic 2.2mF(Set Output Voltage in the range from 2.5 to 5.0V)
Ceramic 4.7mF (Set Output Voltage in the range from 1.5 to 2.5V)
Input Capacitor; Ceramic 2.2mF
R1122Nxx1A
Series R1122Nxx1B
Series
Rev. 1.1 0 - 10 -
n TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R11x2N151B
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0 100 200 300 400 500
Output Current Iout[mA]
Output Voltage Vout[V]
VIN=2.0V
VIN=2.5V
VIN=3.5V
R11x2N201B
0
0.5
1
1.5
2
2.5
0 100 200 300 400 500
Output Current Iout[mA]
Output Voltage Vout[V]
VIN=2.3V
VIN=2.5V
VIN=3.0V
VIN=4.0V
R11x2N301B
0
0.5
1
1.5
2
2.5
3
3.5
0 100 200 300 400 500
Output Current Iout[mA]
Output Voltage Vout[V]
VIN=3.3V
VIN=3.5V
VIN=4.0V
VIN=5.0V
R11x2N401B
0
1
2
3
4
5
0 100 200 300 400 500
Output Current Iout[mA]
Output Voltage Vout[V]
VIN=4.3V
VIN=4.5V
VIN=5.0V
VIN=6.0V
R11x2N501B
0
1
2
3
4
5
6
0 100 200 300 400 500
Output Cur rent Iout[mA]
Output Voltage Vout[V]
VIN=5.3V
VIN=5.5V
VIN=6.0V
VIN=7.0V
Rev. 1.10 - 11 -
2) Output Voltage vs. Input Voltage
R11x2N151B
1.000
1.100
1.200
1.300
1.400
1.500
1.600
1234567
Input Vol tage VIN[V]
Output Voltage VOUT[V]
Iout=1mA
Iout=30mA
Iout=50mA
R11x2N201B
1.500
1.600
1.700
1.800
1.900
2.000
2.100
1234567
Input Vol tage VIN[V]
Output Voltage VOUT[V]
Iout=1mA
Iout=30mA
Iout=50mA
R11x2N301B
2.500
2.600
2.700
2.800
2.900
3.000
3.100
234567
Input Vol tage VIN[V]
Output Voltage VOUT[V]
Iout=1mA
Iout=30mA
Iout=50mA
R11x2N401B
2.500
3.000
3.500
4.000
4.500
234567
Input Vol tage VIN[V]
Output Voltage VOUT[V]
Iout=1mA
Iout=30mA
Iout=50mA
R11x2N501B
2.500
3.000
3.500
4.000
4.500
5.000
5.500
234567
Input Vol tage VIN[V]
Output Voltage VOUT[V]
Iout=1mA
Iout=30mA
Iout=50mA
Rev. 1.1 0 - 12 -
3) Dropout Voltage vs. Output Current
R11x2N151B
0.000
0.100
0.200
0.300
0.400
0.500
0.600
050100150
Output Current IOUT[mA]
Dropout Voltage VDIF [V]
R11x2N201B
0.000
0.100
0.200
0.300
0.400
0.500
0.600
050100150
Output Current IOUT[mA]
Dropout Voltage VDIF [V]
R11x2N301B
0.000
0.100
0.200
0.300
0.400
0.500
0.600
050100150
Output Current IOUT[mA]
Dropout Voltage VDIF[V]
R11x2N401B
0.000
0.100
0.200
0.300
0.400
0.500
0.600
050100150
Output Current IOUT[mA]
Dropout Voltage VDIF[V]
R11x2N501B
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0 50 100 150
Output Current IOUT[mA]
Dropout Voltage VDIF[V]
Topt=-40°C
Topt=25°C
Topt=85°C
Topt=-40°C
Topt=25°C
Topt=85°C
Topt=-40°C
Topt=25°C
Topt=85°C
Topt=-40°C
Topt=25°C
Topt=85°C
Topt=-40°C
Topt=25°C
Topt=85°C
Rev. 1.1 0 - 13 -
4) Outp ut Voltage vs. Te mperature
R11x2N151A/B
1.47
1.48
1.49
1.50
1.51
1.52
1.53
-50 -25 0 25 50 75 100
Te m p erat u r e To pt
Output Voltage VOUT(V)
R11x2N201B
1.90
1.92
1.94
1.96
1.98
2.00
2.02
2.04
2.06
2.08
2.10
-50 -25 0 25 50 75 100
Te m p erat u r e To pt
Output Voltage VOUT[V]
R11x2N301A/B
2.94
2.96
2.98
3.00
3.02
3.04
3.06
-50 -25 0 25 50 75 100
Temperat ure Topt
Output Voltage VOUT
(V)
R11x2N401A/B
3.92
3.94
3.96
3.98
4.00
4.02
4.04
4.06
4.08
-50 -25 0 25 50 75 100
Temperat ure Topt
Output Voltage VOUT
(V)
R11x2N501A/B
4.90
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
-50 -25 0 25 50 75 100
Te m p erat u r e To pt
Output Voltage VOUT(V)
(°C) (°C)
VIN=4.0V CIN=1mF
COUT=2.2mF IOUT=30mA
(°C) (°C)
VIN=5.0V CIN=1mF
COUT=2.2mF IOUT=30mA
(°C)
VIN=6.0V CIN=1mF
COUT=2.2mF IOUT=30mA
VIN=2.5V CIN=1mF
COUT=2.2mFIOUT=30mA VIN=3.0V CIN=1mF
COUT=2.2mF IOUT=30mA
Rev. 1.1 0 - 14 -
5) Supply Current vs. Input Voltage
R11x2N151B
0
20
40
60
80
100
120
1234567
Input Voltage VIN[V]
Supply Current ISS{uA]
R11x2N201B
0
20
40
60
80
100
120
1234567
Input Voltage VIN[V]
Supply Current ISS{uA]
R11x2N301B
0
20
40
60
80
100
120
1234567
Input Voltage VIN[V]
Supply Current ISS{uA]
R11x2N401B
0
20
40
60
80
100
120
1234567
Input Voltage VIN[V]
Supply Current ISS{uA]
R11x2N501B
0
20
40
60
80
100
120
1234567
Input Voltage VIN[V]
Supply Current ISS{uA]
Rev. 1.1 0 - 15 -
6) Supply Current vs. Temperature
R11x2N151A/B
0
50
100
150
200
-50 -25 0 25 50 75 100
Temperatur e Topt
Supply Current Iss(uA)
R11x2N201A/B
0
50
100
150
200
-50 -25 0 25 50 75 100
Temperature T opt
Supply Current Iss(uA)
R11x2N301A/B
0
50
100
150
200
-50 -25 0 25 50 75 100
Te m p erat u r e To pt
Supply Current Iss(uA)
R11x2N401A/B
0
50
100
150
200
-50 -25 0 25 50 75 100
Temperatur e Topt
Supply Current Iss(uA)
R11x2N501A/B
0
50
100
150
200
-50 -25 0 25 50 75 100
Temperature T opt
Supply Current Iss(uA)
(°C)
VIN=2.5V CIN=1mF
COUT=2.2mF
(°C)
VIN=3.0V CIN=1mF
COUT=2.2mF
(°C)
VIN=4.0V CIN=1mF
COUT=2.2mF
(°C)
VIN=5.0V CIN=1mF
COUT=2.2mF
(°C)
VIN=6.0V CIN=1mF
COUT=2.2mF
Rev. 1.1 0 - 16 -
7) Ripple Rejection vs. Frequency
R11x2N151A/B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.1 1 10 100
Frequency Freq [kHz]
Ripple Rejection RR [dB]
R11x2N201A/B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.1 1 10 100
Frequency F req [ kHz ]
Ripple Rejection RR [dB]
R11x2N301A/B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.1 1 10 100
Frequency Freq [kHz]
Ripple Rejection RR [dB]
R11x2N401A/B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.1 1 10 100
Frequency Freq [kHz]
Ripple Rejection RR [dB]
R11x2N501A/B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.1110100
Frequenc y Freq [ k Hz ]
Ripple Rejection RR [dB]
VIN=2.5V+0.5Vp-p
COUT=2.2mF IOUT=30mA
VIN=3.0V+0.5Vp-p
COUT=2.2mF IOUT=30mA
VIN=4.0V+0.5Vp-p
COUT=2.2mF IOUT=30mA VIN=5.0V+0.5Vp-p
COUT=2.2mF IOUT=30mA
VIN=6.0V+0.5Vp-p
COUT=2.2mF IOUT=30mA
Rev. 1.1 0 - 17 -
8) Ripple Rejection vs. Input Voltage (DC bias)
R11x2N301B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
3.10 3.20 3.30 3.40 3.50
Input Voltage VIN[V]
Ripple Rejection RR[d
B
f=400Hz
f=1kHz
f=10kHz
R11x2N301B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
3.10 3.20 3.30 3.40 3.50
Input Voltage VIN[V]
Ripple Rejection RR[dB
]
f=400Hz
f=1kHz
f=10kHz
R11x2N301B
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
3.10 3.20 3.30 3.40 3.50
Input Voltage VIN[V]
Ripple Rejection RR[dB]
f=400Hz
f=1kHz
f=10kHz
9) Input Transient Response
R11X2N151B Topt=25°C
COUT =Ceramic 2.2mF
IOUT=1mA
COUT =Ceramic 2.2mF
IOUT=10mA
COUT =Ceramic 2.2mF
IOUT=50mA
VIN=2.5V<-->3.5V
IOUT=30mA
CIN =none
COUT=2.2mF
tr/tf=5ms
VIN
VOUT
Rev. 1.1 0 - 18 -
R11X2N201B Topt=25°C
R11X2N301B Topt=25°C
R11X2N401B Topt=25°C
VIN=3.0V<-->4.0V
IOUT=30mA
CIN =none
COUT=2.2mF
tr/tf=5ms
VIN
VOUT
VOUT
VIN
VIN=4.0V<-->5.0V
IOUT=30mA
CIN =none
COUT=2.2mF
tr/tf=5ms
VIN=5.0V<-->6.0V
IOUT=30mA
CIN =none
COUT=2.2mF
tr/tf=5ms
VIN
VOUT
Rev. 1.1 0 - 19 -
R11X2N501B Topt=25°C
10) Load Transient Response
R11X2N151B Topt=25°C
R11X2N201B Topt=25°C
VIN
VOUT
VIN=6.0V<-->7.0V
IOUT=30mA
CIN =none
COUT=2.2mF
tr/tf=5ms
IOUT
VOUT IOUT=50mA<-->100mA
VIN=2.5V
CIN=2.2mF
COUT=2.2mF
tr/tf
=
5 s
IOUT
VOUT
IOUT=50mA<-->100mA
VIN=3.0V
CIN=2.2mF
COUT=2.2mF
tr/tf=5ms
Rev. 1.1 0 - 20 -
R11X2N301B Topt=25°C
R11X2N401B Topt=25°C
R11X2N501B Topt=25°C
IOUT=50mA<-->100mA
VIN=4.0V
CIN=2.2mF
COUT=2.2mF
tr/tf=5ms
IOUT
VOUT
IOUT=50mA<-->100mA
VIN=5.0V
CIN=2.2mF
COUT=2.2mF
tr/tf=5ms
IOUT
IOUT
VOUT
VOUT IOUT=50mA<-->100mA
VIN=6.0V
CIN=2.2mF
COUT=2.2mF
tr/tf=5ms
Rev. 1.1 0 - 21 -
n TECHNICAL NOTES
When using these ICs, be sure to cons ider following point s:
l Make VDD and GND line sufficient. When the impedance of th ese is high, there is a case to pick u p th e noise or not to work
correctly.
l Connect the capacitor with a capacitance as much as 2.2mF between VDD and GND as close as possible.
l Set external components, especially Output Capacitor, as close as possible to the ICs and make wiring shortes t.
In these ICs, phase compensation is made for securing stable operation even i f the load current is varied. For this purpose, be
sure to use a capacitor COUT with good frequency c haracteristics and ESR (Equivalent Series Resistance) of which is in the
range described as follows:
3
41
2
R1122NXX1B
CE
VDD
VOUT
GND ESR
Ceramic
Cap.
IOUT
S.A.
Spectrum
Analyzer
VIN Ceramic
Cap.
Measuring Circuit for white noise; R1122NXX1B
The relations between IOUT (Output Current) and ESR of Output Capacito r are shown below. The cond itions when the white
noise level is under 40mV(Avg.) are marked as the hatched area in the graph.
(note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase com pensation,
the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the
PCB.)
<meas uring conditions>
(1) VIN=VOUT+1V
(2) Frequency band :10Hz to 1MHz
(3) Temperature : 25°C
Rev. 1.1 0 - 22 -
R11X2N151B R11X2N151B
COUT=2.2uF,CIN=2.2uF
0.01
0.1
1
10
100
0 30 60 90 120 150
IOUT[mA]
ESR[Ohm]
COUT=4.7uF,CIN=2.2uF
0.01
0.1
1
10
100
0 30 60 90 120 150
IOUT[mA]
ESR[Ohm]
R11X2N301B R11X2N301B
COUT=2.2uF,CIN=2.2uF
0.01
0.1
1
10
100
0 30 60 90 120 150
IOUT[mA]
ESR[Ohm]
COUT=4.7uF,CIN=2.2uF
0.01
0.1
1
10
100
0 30 60 90 120 150
IOUT[mA]
ESR[Ohm]
