Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1148
CMOS IC
600mA LOW DROPOUT LINEAR
REGULATOR

DESCRIPTION
The UTC LR1148 belonged to low-noise, low-dropout, linear
regulators operate from 2.3V to 6V input and are guaranteed to
deliver 600mA. Wide range of preset output voltage options are
available. Built-in low on-resistance transistor provides low dropout
voltage and large output current. The UTC LR1148 is designed and
optimized for battery-powered systems to work with low noise.
The UTC LR1148 consumes less than 0.01μA in shutdown
mode. Other features include ultra low dropout voltage, current
limiting protection, thermal shutdown protection and high ripple
rejection ratio.

FEATURES
* 600mA Guaranteed Output Current
* 0.01μA Shutdown Current
* Ultra Low Dropout Voltage
* Low Temperature Coefficient
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient

ORDERING INFORMATION
Ordering Number
LR1148G-xx-AF5-R
Note: Pin Assignment: I:VIN O:VOUT G:GND
LR1148G-xx-AF5-R

Package
S:EN
SOT-25
A: ADJ
1
I
Pin Assignment
2
3
4
G
S
A
(1)Packing Type
(1) R: Tape Reel
(2)Package Type
(2) AF5: SOT-25
(3)Output Voltage Code
(3) xx: refer to Marking Information
(4)Green Package
(4) G: Halogen Free and Lead Free
5
O
Packing
Tape Reel
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-25
AD: ADJ
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
MARKING
1 of 4
QW-R502-A74.b
LR1148

CMOS IC
PIN CONFIGURATION
VOUT
ADJ
4
5
2
3
GND
EN
PIN DESCRIPTION

PIN NAME
VIN
GND
EN
VOUT
ADJ

1
VIN
DESCRIPTION
Power Input Voltage. Supply voltage can range from 2.3V to 6V. Bypass with a 1µF capacitor to
GND.
Ground
Active-Low Shutdown Input. A logic low at EN reduces supply current to 0.01µA. Connect EN to
VIN for normal operation.
Output Voltage
Voltage-adjust Input. Connect an external resistive voltage-divider from VOUT to ADJ to set the
output voltage between 0.8V and 5V.
BLOCK DIAGRAM
VIN
ON
OFF
EN
Thermal
Sensor
Current Limit
SHDN
VOUT
VREF
AMP
+
ADJ
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 4
QW-R502-A74.b
LR1148

CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°С)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
6.5
V
Power Dissipation
PD
360
mW
Junction Temperature
TJ
+125
°С
Ambient Operating Temperature
TOPR
-40 ~ +85
°С
Storage Temperature
TSTG
-65 ~ +150
°С
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.

THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case

SYMBOL
θJA
θJC
RATINGS
260
81
UNIT
C/W
C/W
ELECTRICAL CHARACTERISTICS
(CIN = 1µF, COUT =1µF, TA= 25°C, unless otherwise specified)(Note 1)
PARAMETER
SYMBOL
TEST CONDITIONS
Input Voltage(Note 2)
VIN
TA=25°С , IOUT= 1mA ~0.6A
Output Voltage Accuracy
VOUT
TA=0~85°С, IOUT= 1mA~0.6A
(Preset Mode)
Maximum Output Current
IOUT
Short-Circuit Current Limit
ILIMIT
VOUT=0V
IOUT = 0mA
Ground Pin Current
IGND
IOUT= 1mA to 600mA
VOUT(NOM)<=1.8V
Dropout Voltage (Note3)
VD
IOUT=600mA
1.8V<VOUT(NOM)
Line Regulation (Note4)
∆VOUT
∆VIN × VOUT
Load Regulation(Note4,5)
Output Voltage Noise
Shutdown Supply Current
∆VOUT
eN
IOFF
VIH
VIL
TSHDN
DTSHDN
VREF
MIN
2.3
-2
-3
TYP
MAX
6
2
3
UNIT
V
%
%
mA
A
µA
µA
600
1
70
80
500
200
1200
450
mV
VIN=VOUT+VD~6V
0.08
0.55
%/V
VIN=VOUT+VD,
IOUT=10mA~600mA
0.25
1.0
%
f=10Hz to100kHz, CBP=0.1nF
EN=GND
µVRM
24
S
µA
2
V
Shutdown Threshold
0.4
V
Thermal Shutdown Temperature
170
°С
Thermal Shutdown Hysteresis
20
°С
ADJ Voltage
Measured on ADJ, IOUT =10mA
0.774
0.8
0.826
V
Adjustable Output Voltage
0.8
5
V
Note: 1. Specifications are production tested at TA=25°C. Pecifications over the -40°C to 85°C operating temperature
range are assured by design, characterization and correlation with Statistical Quality Controls(SQC).
2. The minimum operating value for VIN is equal to either [VOUT(NOM)+VD] or 2.3V,whichever is greater
3. Dropout voltage is defined as the voltage from the input to output when output is 2% below the nominal
value.
4. Output voltage line regulation is defined as the change in output voltage from the nominal value resulting
from a change in the input line voltage. Output voltage load regulation is defined as the change in output
voltage from the nominal value as the load current increases from no load to full load.
5. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested
for load regulation in the load range from 10mA to 600mA.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
0.01
5
3 of 4
QW-R502-A74.b
LR1148

CMOS IC
TYPICAL APPLICATION CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 4
QW-R502-A74.b
Similar pages