Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR9272
Preliminary
CMOS IC
SUPER LOW ON RESISTANCE /
LOW VOLTAGE 1A LDO

DESCRIPTION
The UTC LR9272 is a typical LDO (linear regulator) with the
features of high output voltage accuracy, low supply current, low
ON-resistance, super low dropout, 1A output current capability, and
high ripple rejection.
During operation of the UTC LR9272, the dropout voltage is
very low, Even the output voltage is set at 1.5V, on resistance of
internal FET is typically 0.32Ω. Therefore, applications that require
a large current at small dropout are suitable for the UTC LR9272
series. Low input voltage is acceptable and low output voltage can
be set. The minimum input voltage is 1.4V, and the lowest set
output voltage is 0.8V, and the response of line transient and load
transient are very well.
Internally, there’re many functions of UTC LR9272 which can
be seen in the block figure. There are a voltage reference unit, an
error amplifier, resistor-net for voltage setting, a current limit circuit,
and a chip enable circuit in each UTC LR9272.
The UTC LR9272 can be used as an ideal of the power supply
for hand-held communication equipment, such as: power source for
portable communication equipment, power source for electrical
appliances, for example, cameras, VCRs and camcorders and
power source for battery-powered equipment.

FEATURES
* Low standby current (TYP=0.1µA)
* Ultra-Low supply current (TYP=60µA)
* Output current ([email protected]=VOUT+1.0V)
* Output voltage accuracy (±2.0%)
* Input voltage range (1.4V~6.0V)
* Output voltage (0.8V~5.0V)
* Dropout voltage ([email protected]=3.0V, IOUT=1A)

* Ripple rejection (TYP=70dB @ VOUT=3.0V)
* Line regulation (TYP=0.05%/V)
* Low temperature-drift coefficient of output voltage
* Built-in thermal shuntdown circuit
* Built-in inrush current limit circuit
* Built-in fold-back protection circuit
* Built-in auto discharge function
ORDERING INFORMATION
Ordering Number
Note:
Package
LR9272G-xx-AA3-C-R
SOT-223
LR9272G-xx-AF5-R
SOT-25
xx: Output Voltage, refer to Marking Information.
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Copyright © 2015 Unisonic Technologies Co., Ltd
Pin Assignment
Pin Code
1
2
3
C
G
I
O
Refer to PIN CONFIGURATION
Packing
Tape Reel
Tape Reel
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QW-R102-067.a
LR9272
Preliminary
CMOS IC
MARKING INFORMATION

PACKAGE
VOLTAGE CODE
MARKING
Pin Code
Voltage Code
SOT-223
25: 2.5V
33: 3.3V
50: 5.0V
LR9272
XX
1
2
G
Discharge Function
Date Code
3
SOT-25

PIN CONFIGURATION(For SOT-25)

PIN DESCRIPTION(For SOT-25)
PIN NO.
1
2
3
4
PIN NAME
VOUT
GND
VDD
NC
5
CE or CE
DESCRIPTION
Voltage regulator output pin
Ground pin
Input pin
No connection
Chip enable pin
UNISONIC TECHNOLOGIES CO., LTD
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QW-R102-067.a
LR9272

Preliminary
CMOS IC
BLOCK DIAGRAM
LR9272A
VDD
VOUT
+
Vref
current limit/inrush
current limit/thermal
shutdown
GND
CE
LR9272B
VDD
VOUT
+
Vref
current limit/inrush
current limit/thermal
shutdown
CE
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www.unisonic.com.tw
GND
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LR9272

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA= 25°C, unless otherwise specified)
PARAMETER
Input Voltage
Input Voltage( CE or CE Input Pin)
SYMBOL
VIN
RATINGS
6.5
UNIT
V
VCE
-0.3~6.5
V
Output Voltage
VOUT
-0.3~VIN+0.3
V
Power Dissipation
PD
420
mW
Operating Temperature
TOPT
-40~85
°C
Storage Temperature
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 (TA= 25°C, unless otherwise specified)
LR9272A/B-xx
PARAMETER
Input Voltage
Supply Current
Standby Current
SYMBOL
VIN
ISS
ISTB
Output Voltage
Load Regulation
VOUT
∆VOUT/∆IOUT
Dropout Voltage
Line Regulation
VDIF
∆VOUT/∆VIN
Ripple Rejection
Output Voltage
Temperature Coefficient
Output Current
Short Current Limit
Pull-Down resistance for
CE pin
CE Input Voltage “H”
CE Input Voltage “L”
Thermal Shutdown
Temperature
Thermal Shutdown Released
Temperature
Output Noise
RR
TEST CONDITIONS
MIN
1.4
VIN-VOUT=1.0V, VIN=VCE, IOUT=0A
VIN=6.0V, VCE=0V
VIN-VOUT=1.0V, VOUT>1.5V
x0.98
IOUT=100mA
-30
VOUT≤1.5V
VIN-VOUT=0.3V, 1mA≤IOUT≤300mA,
-15
If VOUT≤1.1V, then VIN=1.4V
VIN-VOUT=0.3V, 1mA≤IOUT≤1A,
If VOUT≤1.1V, then VIN=1.7V
IOUT=300mA
0.8≤VOUT<0.9
IOUT=1A
IOUT=300mA
0.9≤VOUT<1.0
IOUT=1A
IOUT=300mA
1.0≤VOUT<1.5
IOUT=1A
IOUT=300mA
1.5≤VOUT<2.6
IOUT=1A
IOUT=300mA
2.6≤VOUT
IOUT=1A
IOUT=100mA, VOUT+0.5V≤VIN≤6.0V,
If VOUT≤0.9V, 1.4V≤VIN≤6.0V
f=1kHz, (VOUT≤4.0V)
f=1kHz, (VOUT>4.0V), Ripple 0.5Vp-p,
VIN-VOUT=1.0V, IOUT=100mA, If
VOUT≤1.2V, VIN-VOUT=1.5V, IOUT=100mA
∆VOUT/∆TOPT IOUT=100mA, -40°C≤TOPT≤ 85°C
ILIM
ISC
60
0.1
15
MAX UNIT
6.0
V
100
µA
1.0
µA
x1.02
V
+30
mV
30
50
0.33
0.72
0.22
0.64
0.18
0.56
0.10
0.32
0.05
0.18
0.57
0.05
0.20
0.47
0.32
0.15
0.10
1.9
VCEH
VCEL
1.0
0
V
V
V
V
V
V
V
V
V
V
%/V
70
dB
60
dB
ppm
/°C
A
mA
1
500
RPD
mV
mV
±100
VIN-VOUT=1.0V
VOUT=0V
5.0
15.0
MΩ
6.0
0.4
V
V
TTSD
Junction Temperature
150
°C
TTSR
Junction Temperature
120
°C
BW=10Hz~100kHz
30
μVrms
en
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
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LR9272

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.
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www.unisonic.com.tw
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