Datasheet

UNISONIC TECHNOLOGIES CO., LTD
L1188
Preliminary
CMOS IC
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.
„
1
SOT-223
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
Lead Free
Halogen Free
L1188L-xx-AA3-A-R
L1188G-xx-AA3-A-R
Note: Pin Assignment: G:GND O:VOUT I:VIN
xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
Package
SOT-223
Pin Assignment
1
2
3
G
O
I
Packing
Tape Reel
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L1188
„
Preliminary
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
28 :2.8V
SOT-223
33:3.3V
„
PIN CONFIGURATION
„
PIN DESCRIPTION
„
CMOS IC
PIN NO.
1
PIN NAME
GND
2
VOUT
3
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.
BLOCK DIAGRAM
VIN
Overcurrrent
Shutdown
Thermal
Shutdown
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
GND - 0.3 ~ VIN + 0.3
V
Input Voltage
VIN
8
V
Output Current
IOUT
1
A
Power Dissipation
PD
800
mW
Junction Temperature
TJ
125
°C
Ambient Operating Temperature
TOPR
- 40 ~ +85
°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
Input Voltage
Output Voltage Accuracy
Line Regulation
Load Regulation
Output Current
Current Limit
Short Circuit Current
Quiescent Current
Ground Pin Current
Dropout Voltage
Over Temperature Shutdown
Over Temperature Hysteresis
Temperature Coefficient of
Output Voltage
Power Supply Ripple
Rejection
SYMBOL
TEST CONDITIONS
MIN TYP
VIN
Note1
VOUT
IOUT = 1mA
-1.5
-0.15
1.8V≤VOUT≤2.0V
ΔVOUT IOUT=1mA
2.0V<VOUT<4.0V
-0.1 0.02
VOUT
VIN=VOUT+1~VOUT+2
VOUT≥4.0V
-0.4
0.2
ΔVOUT
0.2
IOUT =1mA~800mA
VOUT
IOUT
VOUT≥1.8V
800
ILIMIT
VOUT≥1.8V
900
ISC
VOUT<0.8V
400
IQ
IOUT=0mA
30
IGND
IOUT=1mA ~ 800mA
35
1.8V≤VOUT(NOM)≤2.0V
IOUT=800mA
VD
2.0V<VOUT(NOM)≤2.8V
VOUT=VOUT(NOM)-2.0%
2.8V<VOUT(NOM)
OTS
150
OTH
30
TCVO
PSRR
f=100Hz
f=1kHz
f=10kHz
IOUT=10mA, COUT=2.2μF, f=10Hz~100kHz
IOUT=100mA
CO=2.2μF
MAX
7
1.5
0.15
0.1
0.4
UNIT
V
%
%
%
%
1
%
800
50
1400
1000
800
mA
mA
mA
μA
μA
mV
mV
mV
°C
°C
30
ppm/°C
60
50
20
30
dB
dB
dB
μVRMS
Output Voltage Noise
eN
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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www.unisonic.com.tw
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L1188
Preliminary
„
TYPICAL APPLICATION CIRCUIT
„
APPLICATION INFORMATION
CMOS IC
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.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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