Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR9280
Preliminary
CMOS IC
150mA LDO REGULATOR

DESCRIPTION
The UTC LR9280 is a typical LDO (linear regulator) with the
features of high output voltage accuracy, low supply current, low
ON-resistance. Internally, there’re many functions of UTC LR9280
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 LR9280.
The output voltage of these ICs is fixed with high accuracy. B
version has a chip enable pin, therefore low consumption current
standby mode can be realized with the pin.

FEATURES
* Output voltage accuracy (±2.0%)
* Output voltage Range (1.2V~3.6V)
* Dropout voltage (TYP=0.25V )(IOUT=150mA 3.0V Output type)
* Line regulation (TYP=0.05%/V)
* Temperature-Drift Coefficient of Output Voltage
(TYP=±100ppm/°C)
* Ceramic capacitors are recommended to be used with this IC
(1μF)

ORDERING INFORMATION
Note:
Ordering Number
LR9280xG-xx-AE5-R
xx: Output Voltage, refer to Marking Information.
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Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-23-5
Packing
Tape Reel
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LR9280

Preliminary
CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-23-5
12: 1.2V
15: 1.5V
18: 1.8V
28: 2.8V

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
LR9280B
LR9280C
1
1
2
2
3
4
3, 4
5
5
MARKING
PIN NAME
VDD
GND
CE
NC
VOUT
DESCRIPTION
Input pin
Ground pin
Chip Enable Pin
No Connection
Output pin
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LR9280

Preliminary
CMOS IC
BLOCK DIAGRAM
LR9280B-xx
VDD
VOUT
+
Vref
current Limit
GND
CE
LR9280C-xx
VDD
VOUT
+
Vref
current Limit
GND
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LR9280

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~VIN+0.3
V
Output Current
IOUT
180
mA
Power Dissipation
PD
420
mW
Operating Temperature
TOPR
-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 noted)
PARAMETER
Output Voltage
SYMBOL
VOUT
Output Current
IOUT
Dropout Voltage
VDIF
Input Voltage
Supply Current
Standby Current
VIN
ISS
ISTB
Load Regulation
∆VOUT/∆IOUT
Line Regulation
∆VOUT/∆VIN
Output Voltage
Temperature Coefficient
Short Current Limit
CE Pull-down Constant
Current
CE Input Voltage “H”
CE Input Voltage “L”
TEST CONDITIONS
MIN
VIN=Set VOUT+1V, 1μA ≤ IOUT≤30mA x0.980
VIN−VOUT=1.0V(VOUT ≥1.5V)
150
VIN=2.4V(VOUT<1.5V)
1.2≤VOUT<1.3
1.3≤VOUT<1.4
1.4≤VOUT<1.5
1.5≤VOUT<1.7
IOUT=150mA
1.7≤VOUT<1.9
1.9≤VOUT<2.1
2.1≤VOUT<2.8
2.8≤VOUT≤3.6
1.7
VIN-VOUT=1.0V, IOUT=0mA
VIN−VOUT=1.0V,VCE=GND
VIN−VOUT=1.0V(VOUT ≥ 1.5V)
VIN=2.4V(VOUT<1.5V)
1μA ≤IOUT≤150mA
IOUT=30mA
VOUT+0.5V≤VIN ≤ 6.0V
(VOUT≥1.5V), 2.0V≤VIN≤6.0V
(1.2V≤VOUT≤1.4V)
∆VOUT/∆TOPT IOUT=30mA, -40°C≤TOPT≤85°C
MAX UNIT
x1.020
V
mA
0.85
0.75
0.65
0.60
0.50
0.40
0.35
0.25
0.7
0.1
1.20
1.10
1.00
0.90
0.75
0.65
0.55
0.40
6.0
1.5
1.0
V
V
V
V
V
V
V
V
V
µA
µA
20
40
mV
0.05
0.20
%/V
±100
ppm/°C
ISC
VOUT=0V
500
mA
IPD
LR9280B
0.35
µA
VCEH
VCEL
LR9280B
LR9280B
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
1.2
0.0
6.0
0.3
V
V
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Preliminary
CMOS IC
TEST CIRCUITS
VOUT
VDD
UTC
LR9280
C2
C1
V VOUT
GND
CE/NC
C1=Ceramic 1.0μF
C2=Ceramic 1.0μF
Standard test Circuit
VOUT
VDD
ISS
IOUT
UTC
LR9280
A
C2
C1
GND
CE/NC
C1=Ceramic 1.0μF
C2=Ceramic 1.0μF
Supply Current Test Circuit
VOUT
VDD
UTC
LR9280
C2
Pulse
Generator
CE/NC
IOUT
GND
C2=Ceramic 1.0μF
Ripple Rejection, Line Transient Response Test Circuit
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LR9280

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC
LR9280
C2
C1
CE/NC
VOUT
VOUT
VDD
IN
GND
(External Components)
Output Capacitor
Ceramic Capacitor 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.
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