UNISONIC TECHNOLOGIES CO., LTD L1138

UNISONIC TECHNOLOGIES CO., LTD
L1138
Preliminary
CMOS IC
HIGH OUTPUT CURRENT CMOS
VOLTAGE REGULATOR WITH
HIGH RIPPLE-REJECTION AND
LOW DROPOUT

1
DESCRIPTION
The UTC L1138 is a positive LDO voltage regulator using CMOS
technology. It is featured as: low dropout voltage, high output voltage
accuracy, and low current consumption.
The internal circuits include a low on-resistance transistor to provide
a low dropout voltage and large output current; an overcurrent protector
to make sure the load current don’t exceed the current capacitance of
the output transistor, a thermal shutdown circuit to escape device
damage from over-heat, and an ON/OFF circuit to keep the battery life
longer.
In applications, the UTC L1138 can be used in power supply unit for
DVD,
CD-ROM
drives,
battery-powered
devices,
personal
communication devices, and NBs.

SOP-8
SOT-89-5
FEATURES
* Output voltage‘s high accuracy: ±1.0%
* Low dropout voltage:
120mV typ.
@3.3V output , IOUT=300mA
* Low current consumption:
80μA(Typ.)160μA max in operation
0.1μA(Typ.)1.0μA max in shutdown mode
* High current capability:
800mA output
@VIN≥VOUT(S)+1.0V
* With ON/OFF circuit:
Ensures long battery life.
* High ripple rejection
70dB [email protected]
* With over current protector
* With thermal shutdown circuit

ORDERING INFORMATION
Ordering Number
L1138G-xx-AB5-R
L1138G-xx-S08-R
xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-89-5
SOP-8
Packing
Tape Reel
Tape Reel
1 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
MARKING INFORMATION
PACKAGE
SOT-89-5
SOP-8
VOLTAGE CODE
MARKING
12: 1.2V
25: 2.5V
28: 2.8V
33: 3.3V
35: 3.5V
36: 3.6V
45: 4.5V
50: 5.0V

PIN CONFIGURATION

PIN DESCRIPTION
FOR SOT-89-5 Package
PIN NO.
PIN NAME
1
ON/OFF
2
GND
3
NC
4
VIN
5
VOUT
FOR SOP-8 Package
PIN NO.
PIN NAME
1,2,3
VOUT
4
GND
5
ON/OFF
6,7,8
VIN
Notes: 1. Short pins 1, 2, 3
2. Short pins 6, 7, 8
DESCRIPTION
Shutdown Pin
Ground Pin
No Connection, NC pin is electrically open and can be connected VIN and VSS
Input voltage Pin
Output voltage Pin
DESCRIPTION
Output voltage Pin (Note 1)
Ground Pin
Shutdown Pin
Input voltage Pin (Note 2)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
BLOCK DIAGRAM
VIN
Overcurrent Protector
Thermal Shutdown
Reference
Voltage Circuit
ON/OFF
Circuit
+
Parasitic
diode
VOUT
ON/OFF
VSS
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING(TA = 25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
VIN
VSS -0.3~VSS+7
V
Input Voltage
VSS -0.3~VIN+0.3
V
VON/OFF
Output Voltage
VOUT
VSS -0.3~VIN+0.3
V
Power Dissipation
PD
Internally limited
mW
Operating Temperature
TOPR
-40~+85
°C
Storage Temperature
TSTG
-40~+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 (TA= 25°C, VIN=VOUT+1V, unless otherwise specified)
Parameter
Input Voltage
Output Voltage (Note 1)
Line Regulation
Load Regulation
SYMBOL
VIN
VOUT(E)
∆VOUT1
∆VIN × VOUT
∆VOUT2
Output Current (Note 2)
IOUT
Current
Consumption
During
Operation
ISS1
Shutdown
ISS2
Short-Circuit Current
Dropout Voltage (Note 3)
ISHORT
VD
Temperature Coefficient of
Output Voltage
TCVO
Power Supply Rejection
PSRR
Shutdown Pin
Input Voltage
Shutdown Pin
Input Current
High
Low
High
Low
Detection
VSH
VSL
ISH
ISL
TSD
TEST CONDITIONS
MIN
VIN =VOUT(S)+1.0V, IOUT =100mA
-1%
VOUT(S) + 0.5V ≤VIN ≤6.5V,
IOUT = 100mA
VIN = VOUT(S) + 1.0 V,
1.0mA ≤IOUT ≤300mA
VIN ≤VOUT(S)+1.0 V
VIN = VOUT(S) +1.0 V,
ON/OFF pin = ON, no load
VIN = VOUT(S) + 1.0 V,
ON/OFF pin = OFF, no load
VIN = VOUT(S) + 1.0 V,
ON/OFF pin = ON, VOUT = 0 V
VOUT(S) =1.2V
VOUT(S) =2.5V
IOUT = 300mA
VOUT(S) =2.8V
3.3V ≤ VOUT(S) ≤ 5.5V
VIN = VOUT(S) +1.0V,
IOUT = 10mA, -40°C≤ TA ≤85°C
VIN= VOUT(S)+1.0 V
1.2V ≤VOUT(S)≤ 3.0V
f = 1.0kHz,
IOUT = 100 mA
3.1V ≤VOUT(S)≤ 5.5V
∆Vrip = 0.5Vrms
VIN = VOUT(S) +1.0V
VIN = VOUT(S) + 1.0V
VIN = 6.5V, VON/OFF = 6.5V
VIN = 6.5V, VON/OFF = 0V
Junction temperature
TYP
MAX UNIT
6.5
V
+1%
V
0.05
0.3
%/V
30
100
mV
800
mA
80
160
µA
0.1
1.0
µA
350
0.8
0.15
0.15
0.12
mA
1.0
0.22
0.22
0.18
±150
V
ppm/°C
70
dB
65
1.5
-0.1
-0.1
0.3
0.1
0.1
V
V
µA
µA
°C
Thermal
150
Shutdown
Release
TSR
Junction temperature
120
°C
Temperature
Notes: 1. VOUT(S): Specified output voltage.
VOUT(E): Actual output voltage at the fixed load
2. When fixing( IOUT= 100mA) and inputting VOUT(S) + 1.0 V
3. This output current means the one at which the output voltage becomes 98% of VOUT(E) after gradually
increasing the output current.
4. The dropant voltage is detmed as VIN - VOUT, which is measured when VOUT is VOUT(normal) × 98%
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
OPERATION
1. Basic operation
The reference voltage (VREF) and VFB(the output voltage resistance-divided by feedback resistors RS and RF)
are the input for the error amplifier.
2. Output transistor
A low on-resistance P-channel MOSFET is used as the output transistor. Inverse current flowing from VOUT pin
through a parasitic diode to VIN pin can damage the regulator, so be sure that VOUT does not exceed VIN + 0.3V.
3. Shutdown pin (ON/OFF pin)
The shutdown pin can start and stop the regulator.The shutdown mode set by this pin can stop the operation
of all internal circuits. The structure of the ON/OFF pin is shown in Fig. 1. When the ON/OFF pin is not used,
connect it to the VSS pin if the logic type is “A” and to the VIN pin if it is “B”.
Logic Type
A
A
B
B
ON/OFF Pin
“L”: Power on
“H”: Power off
“L”: Power off
“H”: Power on
Internal Circuits
Operating
Stopped
Stopped
Operating
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
VOUT Pin Voltage
Set value
VSS level
VSS level
Set value
Current Consumption
ISS1
ISS2
ISS2
ISS1
5 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
TEST CIRCUITS
1. Output Voltage Test
2. Current Consumption Test
3. Output Current Test
4. Shutdown Pin Input Voltage / Current Test
5. Power Supply Rejection Test
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 7
QW-R502-323.i
L1138

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
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
7 of 7
QW-R502-323.i