Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR8845
Preliminary
CMOS IC
3A LOW DROPOUT LINEAR
REGULATOR
„
DESCRIPTION
The UTC LR8845 belonged to low quiescent current, low
dropout linear regulators operated from 2.5V to 6V input and are
guaranteed to deliver 3A. 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 LR8845 is
designed and optimized for battery-powered systems to work with
low noise.
The UTC LR8845 consumes less than 2μA in shutdown mode.
Other features include ultra low dropout voltage, current limiting
protection, thermal shutdown protection and high ripple rejection
ratio.
„
FEATURES
* 3A Guaranteed Output Current
* low quiescent current: 300μA (typ.)
* 2μA Shutdown Current
* Short Circuit Current Fold-back
* Low Temperature Coefficient
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient
* SENSE Option Improves Load Regulation
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR8845L-xx-AA3-D-R
LR8845G-xx-AA3-D-R
LR8845L-xx-TN3-D-R
LR8845G-xx-TN3-D-R
LR8845L-xx-TN3-D-T
LR8845G-xx-TN3-D-T
LR8845L-xx-TQ3-D-R
LR8845G-xx-TQ3-D-R
LR8845L-xx-TQ3-D-T
LR8845G-xx-TQ3-D-T
Note: 1. Pin assignment: I: VIN O: VOUT G: GND
2. xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
Package
SOT-223
TO-252
TO-252
TO-263
TO-263
Pin Assignment
1
2
3
I
G
O
I
G
O
I
G
O
I
G
O
I
G
O
Packing
Tape Reel
Tape Reel
Tube
Tape Reel
Tube
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QW-R502-750.a
LR8845
„
Preliminary
CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
G: Halogen Free
L: Lead Free
LR8845
Pin Code
SOT-223
Voltage Code
Date Code
1
2
3
25:2.5V
TO-252
TO-263
„
BLOCK DIAGRAM
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QW-R502-750.a
LR8845
„
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°С)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
7
V
Power Dissipation
PD
Internally limited
mW
Junction Temperature
TJ
+150
°С
Operation 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
„
SYMBOL
TO-223
TO-252
TO-263
RATINGS
165
108
64
θJA
UNIT
°С/W
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 1V whichever is greater, CIN =0.1µF, COUT =2.2µF (Ceramic), TA= 25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
VIN
Note1
6
V
TA=25°С , IOUT= 1mA ~3A
-2
2
%
Output Voltage Accuracy
VOUT
TA=0~85°С, IOUT= 1mA~3A
-3
3
Maximum Output Current
IOUT
3
A
Short-Circuit Current Limit
ILIMIT
VOUT>1.2V
4.5
A
Short-Circuit Current
ISC
VOUT<0.4V
1.7
A
300
400
IOUT = 0mA
µA
Ground Pin Current
IGND
IOUT= 1mA to 3A
300
1000
1.5V<=VOUT<=1.8V
mV
Dropout Voltage (Note 2)
VD
IOUT=3A 1.8V<VOUT<2.5V
700
2.5<=VOUT
300
450
Line Regulation
ΔVOUT
ΔVIN × VOUT
Load Regulation
Output Voltage Noise
Shutdown Supply Current
Power Supply Rejection
Shutdown Threshold
ΔVOUT
eN
IOFF
PSRR
VIN=VOUT+VD~6V
0.1
0.2
%/V
VIN=VOUT+1V, IOUT=10mA~3A
f=10Hz to100kHz, COUT=2.2μF
0.2
30
1
%
µVRMS
2
10
µA
SHDN =GND
IOUT=100mA
COUT=10μF
VIH
VIL
TSHDN
DTSHDN
f=100Hz
f=1kHz
70
60
dB
2
0.4
Thermal Shutdown Temperature
150
Thermal Shutdown Hysteresis
20
Notes: 1. VIN(MIN)= VOUT+ VDROPOUT
2. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) × 98%
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
V
°С
3 of 4
QW-R502-750.a
LR8845
„
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-750.a
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