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UNISONIC TECHNOLOGIES CO., LTD
L1131A
LOW NOISE 150mA LDO
REGULATOR
DESCRIPTION
The UTC L1131A is a COMS positive linear regulator. One of
it’s feature is the very low quiescent current typical as low as 10μA
and its dropout voltage is extremely low with 150mA output current,
and high ripple rejection. Each of these ICs consists of a voltage
reference unit, an error amplifier, resistor-net for voltage setting, a
short current limit circuit, a chip enable circuit, and so on.
These ICs perform with low dropout voltage and the chip-enable
function. The supply current at no load of this IC is only 4.3μA, and
the line transient response and the load transient response of the
UTC L1131A Series are excellent, thus these ICs are very suitable
for the power supply for hand-held communication equipment.
The output voltage of these ICs is fixed with high accuracy.
Since the packages for these ICs are SOT-23-5 therefore high
density mounting of the ICs on boards is possible.
FEATURES
* Low supply current Typ. 4.3μA
* Standby mode Typ. 0.1μA
* Output Voltage Range 1.2V~5.0V
* Excellent line regulation Typ. 0.02%/V
* Built-in fold back protection circuit
* Ceramic capacitors are recommended to be used with this IC
CIN=COUT=1μF
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L1131AL-xx-AE5-R
L1131AG-xx-AE5-R
Note: xx: Output Voltage, refer to M arking Information.
Package
SOT-23-5
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2019 Unisonic Technologies Co., Ltd
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L1131A
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-23-5
15: 1.5V
25: 2.5V
28: 2.8V
33: 3.3V
PIN CONFIGURATION
CMOS IC
Voltage Code
MARKING
54
HXXA
123
L: Lead Free
G: Halogen Free
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
VIN
GND
CE
NC
VOUT
Input pin
Ground pin
Chip enable pin
No connection
Output pin
BLOCK DIAGRAM
DESCRIPTION
VIN
-
+
VREF
Current Limit
CE
VOUT
GND
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L1131A
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
Input Voltage (CE Pin)
VIN 6.5 V
VCE 6.5 V
Output Voltage
Output Current
VOUT
IOUT
-0.3 ~ VIN+0.3
160
V
mA
Power Dissipation
Operating Temperature Range
PD
TOPT
360
-40 ~ +85
mW
°C
Storage Temperature Range
TSTG
-55 ~ +125
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Output Voltage
Output Current
VOUT
IOUT
VIN = Set VOUT+1V,
1mA ≤ IOUT ≤30mA
VIN-VOUT=1.0V
VOUT≤3.0V
VOUT>3.0V
×0.985
×0.980
150
×1.015
×1.020
V
mA
Load Regulation
VIN=Set VOUT+1V, 1mA≤IOUT≤150mA,
∆VOUT/∆IOUT
1.2V≤VOUT<2.0V,
2.0V≤VOUT<3.0V
28 55 mV
33 66 mV
Dropout Voltage
3.0V≤VOUT
35 80 mV
VDIF
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
Supply Current
Supply Current (Standby)
ISS VIN=Set VOUT+1V, IOUT=0mA
Istandby VIN=Set VOUT+1V, VCE =GND
4.3 18
0.1 1.0
μA
μA
Line Regulation
∆VOUT/∆VIN
Set VOUT+0.5V≤VIN≤6.0V,
IOUT=30mA
f=1kHz
0.02 0.10 %/V
50 dB
Ripple Rejection
Input Voltage
RR f=10kHz, Ripple 0.2Vp-p,
VIN-VOUT=1.0V, IOUT=30mA
VIN
45 dB
1.8 6.0 V
Output Voltage Temperature
Coefficient
∆VOUT/∆T IOUT=30mA, -40°C≤TOPT≤85°C
±100
ppm/°C
Short Current Limit
ILIM VOUT=0V
60 mA
CE Pull-Down Resistance
CE Input Voltage “H”
IPD
VCEH
0.5
1.5 6.0
µA
V
CE Input Voltage “L”
Output Noise
VCEL
en
BW=10Hz~100kHz
0.0 0.3 V
30 µVrms
On Resistance of Nch Tr. for
auto-discharge (Only for D version)
RLOW
VCE=0V
70 Ω
ELECTRICAL CHARACTERISTICS BY OUTPUT VOLTAGE
PARAMETER
Dropout Voltage
SYMBOL
TEST CONDITIONS
VOUT=1.2V
1.5V<VOUT≤1.6V
VDIF IOUT=150mA
1.6V<VOUT≤1.7V
1.7V<VOUT≤2.0V
2.0V<VOUT≤2.7V
2.7V<VOUT≤5.0V
MIN TYP MAX UNIT
0.65 V
0.48 V
0.41 V
0.35 V
0.21 V
0.18 V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L1131A
TEST CIRCUIT
CMOS IC
Fig.1 Standard test Circuit
IOUT
C2
Fig.2 Supply Current Test Circuit
VOUT
VIN
UTC
L1131A
Series
GND
CE
Pulse
Generator
*C2=Ceramic 1.0μF
Fig.3 Ripple Rejection, Line Transient
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L1131A
TYPICAL APPLICATION CIRCUIT
(External Components)
C1 Ceramic 1.0μF
C2 Ceramic 1.0μF
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
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