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UNISONIC TECHNOLOGIES CO., LTD
L1188
Preliminary
800mA CMOS LDO
„ DESCRIPTION
As UTC LDO, the features of the UTC L1188 include low
quiescent current and very low dropout voltage.
In order prevent form the bad operating conditions, there are
internal thermal shutdown and current fold-back. For stably
operation, the UTC L1188 should be connected to an output
capacitance of 2.2μF or larger.
The UTC L1188 can be an ideal for battery applications, such as
portable electronics, wireless devices, cordless phones, PC
peripherals and battery powered widgets.
„ FEATURES
* Extra Low Dropout Voltage
* Output Current: 800mA (Guaranteed)
* Output Voltage Accuracy:±1.5%
* Quiescent Current: 30μA
* Internal Over-Temperature Shutdown
* With Current limiting
* Internal Short Circuit Current Fold-Back
* Pre-set Output Voltages In Factory
* Very Low Temperature Coefficient
„ ORDERING INFORMATION
Ordering Number
Package
L1188G-xx-AA3-A-R
SOT-223
Note: Pin Assignment: G:GND O:VOUT I:VIN
xx: Output Voltage, refer to Marking Information.
Pin Assignment
123
GO
I
CMOS IC
1
SOT-223
Packing
Tape Reel
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Copyright © 2010 Unisonic Technologies Co., Ltd
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L1188
„ MARKING INFORMATION
PACKAGE
VOLTAGE CODE
Preliminary
SOT-223
28 :2.8V
33:3.3V
MARKING
„ PIN CONFIGURATION
CMOS IC
„ PIN DESCRIPTION
PIN NO.
1
2
3
PIN NAME
GND
VOUT
VIN
DESCRIPTION
Ground.
Output voltage pin which should be decoupled with a ceramic capacitor
(Value: 2.2µF or larger and low ESR).
Input voltage pin which should be decoupled with 1µF or greater capacitor.
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L1188
„ BLOCK DIAGRAM
VIN
Preliminary
Overcurrrent
Shutdown
Thermal
Shutdown
CMOS IC
VREF=1.215V
AMP
VOUT
R1
R2
GND
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L1188
Preliminary
CMOS IC
„ ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input, Output Voltage
Input Voltage
GND - 0.3 ~ VIN + 0.3
V
VIN 8 V
Output Current
Power Dissipation
IOUT
1A
PD 800 mW
Junction Temperature
Ambient Operating Temperature
TJ
TOPR
125
- 40 ~ +85
°C
°C
Storage Temperature
TSTG
- 65 ~ +150
°C
Notes: 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.
„ THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case (Note)
Note: Measure θJC on backside center of tab.
SYMBOL
θJA
θJC
RATINGS
135
31
UNIT
°C/W
°C/W
„ ELECTRICAL CHARACTERISTICS (Ta = 25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Input Voltage
Output Voltage Accuracy
Line Regulation
Load Regulation
VIN
VOUT
ΔVOUT
VOUT
ΔVOUT
VOUT
IOUT = 1mA
IOUT=1mA
VIN=VOUT+1~VOUT+2
IOUT =1mA~800mA
1.8VVOUT2.0V
2.0V<VOUT<4.0V
VOUT4.0V
Note1
-1.5
-0.15
-0.1 0.02
-0.4 0.2
7
1.5
0.15
0.1
0.4
0.2 1
V
%
%
%
%
%
Output Current
Current Limit
Short Circuit Current
Quiescent Current
Ground Pin Current
Dropout Voltage
Over Temperature Shutdown
IOUT VOUT1.8V
800 mA
ILIMIT VOUT1.8V
900 mA
ISC VOUT<0.8V
400 800 mA
IQ IOUT=0mA
30 50 μA
IGND IOUT=1mA ~ 800mA
35 μA
VD
IOUT=800mA
VOUT=VOUT(NOM)-2.0%
1.8VVOUT(NOM)2.0V
2.0V<VOUT(NOM)2.8V
2.8V<VOUT(NOM)
1400
1000
800
mV
mV
mV
OTS
150 °C
Over Temperature Hysteresis OTH
30 °C
Temperature Coefficient of
Output Voltage
TCVO
30 ppm/°C
Power Supply Ripple
Rejection
PSRR
IOUT=100mA
CO=2.2μF
f=100Hz
f=1kHz
f=10kHz
60 dB
50 dB
20 dB
Output Voltage Noise
eN IOUT=10mA, COUT=2.2μF, f=10Hz~100kHz
30 μVrms
Notes: 1. VIN(MIN)=VOUT+VD
2. To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage
must be applied before a current source load is applied.
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L1188
Preliminary
„ TYPICAL APPLICATION CIRCUIT
CMOS IC
„ APPLICATION INFORMATION
1. Detailed Description
Internal circuits include: a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and
thermal shutdown.
The data through the error amplifier, over-current shutdown, and thermal protection circuits, then to the
P-channel pass transistor.
As soon as the junction temperature exceeds 150°C or the current exceeds 900mA, over-current and thermal
shutdown circuits start working. When the junction temperature drops below 120°C, normal operation is restored.
When the load exceeds the rated output current, for preventing the over stress, the chip switches from voltage
mode to current mode.
2. External Information
When considering the external capacitors, the L1188 is stable with an output capacitor to ground of 2.2μF or
greater. As we know, the ceramic capacitors have the lowest ESR but can offer the best AC performance; the
aluminum electrolytic capacitors exhibit the highest ESR but offer the poorest AC response. And also large value
ceramic capacitors are expensive. Consider all the situation, the best way is to parallel a 0.1μF ceramic capacitor with
a 10μF Aluminum Electrolytic (low ESR, high capacitance, and low overall cost).
For better beneficial effecting, the input capacitor should be at least 0.1μF.
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