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UNISONIC TECHNOLOGIES CO., LTD
L1131A
Preliminary
LOW NOISE 150mA LDO
REGULATOR
DESCRIPTION
The UT C L1131A is a COMS positive lin ear regul ator. One of
it’s feature is t he very low quiescent current typical as low as 10μA
and its dropout voltage is extremely low with 150mA output current,
and hi gh rip ple rejection. Eac h of these ICs consists of a voltage
reference unit, an error am plifier, resistor-net for voltage se tting, 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 thi s IC is onl y 10μA, and
the line tra nsient respons e a nd t he lo ad tra nsient res ponse of the
UTC L1131A Series are excellent, thus these ICs are ver y suitable
for the power supply for hand-held communication equipment.
The output vol tage of th ese ICs is fixed with hig h accur acy.
Since th e pac kages for th ese ICs are SO T-23-5 therefore hig h
density mounting of the ICs on boards is possible.
FEATURES
* Low supply current Typ. 10μA
* 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 ca pacitors are rec ommended to be use d with this IC
CIN=COUT=1μF
ORDERING INFORMATION
Note:
Ordering Number
Lead Free
Halogen Free
L1131AL-xx-AF5-R
L1131AG-xx-AF5-R
xx: Output Voltage, refer to Marking Information.
Package
SOT-25
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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L1131A
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
Preliminary
SOT-25
25: 2.5V
33: 3.3V
MARKING
PIN CONFIGURATION
CMOS IC
PIN DESCRIPTION
PIN NO.
1V
2 GND
3
4 NC
5V
PIN NAME
DD Input
pin
Ground pin
CE Chip enable pin
No connection
OUT Output
pin
BLOCK DIAGRAM
DESCRIPTION
VDD
-
+
VREF
Current Limit
CE
VOUT
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L1131A
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER SYMBOL
RATINGS
UNIT
Input Voltage
VIN 6.5
V
Input Voltage (CE Pin)
VCE 6.5
V
Output Voltage
VOUT -0.3~V
IN+0.3
V
Output Current
IOUT 160
mA
Power Dissipation
PD 360
mW
Operating Temperature Range TOPT -40~ 85 °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 150
VOUT≤3.0V ×
VOUT>3.0V ×0
0.985
.980
×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 =VDD
10 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
50
%/V
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
Short Current Limit
∆VOUT/∆T
IOUT=30mA
-40°C≤TOPT≤85°C
ILIM VOUT=0V
± 100
60
ppm/°C
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 SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
VOUT=1.2V
1.5V<VOUT≤1.6V
0.65
0.48
V
V
Dropout Voltage
VDIF IOUT=150mA
1.6V<VOUT≤1.7V
1.7V<VOUT≤2.0V
0.41
0.35
V
V
2.0V<VOUT≤2.7V
2.7V<VOUT≤5.0V
0.21
0.18
V
V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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