Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR18230
Preliminary
CMOS IC
3A ULTRA LOW DROPOUT
LINEAR REGULATOR

DESCRIPTION
The UTC LR18230 series of high performance ultra-low dropout
linear regulators operates from 2.5V to 6V input supply and
provides ultra-low dropout voltage, high output current with low
ground current. These ultra-low dropout linear regulators respond
fast to step changes in load which makes them suitable for low
voltage micro-processor applications. The UTC LR18230 is
CMOS-based positive voltage and a very low dropout regulator IC
which allows low quiescent current operation independent of output
load current. This CMOS process also allows the UTC LR18230 to
operate under extremely low dropout conditions.

HSOP-8
FEATURES
* 400mV Dropout @ 3A, VO=2.5V
* Compatible with low ESR MLCC as Input/Output Capacitor
* Good Line and Load Regulation
* Guaranteed Output Current of 3A
* Available in HSOP-8 Package
* Over-Temperature/Over-Current Protection

ORDERING INFORMATION
Ordering Number
LR18230G-xx-S08-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
HSOP-8
Packing
Tape Reel
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QW-R102-074.a
LR18230
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MARKING INFORMATION
PACKAGE
VOLTAGE CODE
HSOP-8
AD: ADJ
MARKING
PIN CONFIGURATION
NC 1
8 GND
EN 2
7 ADJ
VIN 3
6 VOUT
NC 4
5 NC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8

CMOS IC
PIN NAME
N.C
EN
VIN
N.C
N.C
VOUT
ADJ
GND
DESCRIPTION
No connect
Chip Enable Pin
Input Supply Voltage Pin.
No connect
No connect
Voltage Regulator Output Pin
Feedback Pin
Ground Pin
BLOCK DIAGRAM
VIN
EN
Reference
(0.8V)
Error
AMP
VOUT
OCP/TSD
ADJ
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LR18230
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input Supply Voltage (Survival)
VIN
6
V
Enable Input Voltage (Survival)
VEN
6
V
Maximum Output Current
IMAX
3
A
Lead Temperature (Soldering, 5 sec)
TL
260
°C
Operating Junction Temperature
TJ
-40 ~ +125
°C
Storage Temperature Range
TSTG
-65 ~ +150
°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.

THERMAL DATA
PARAMETER
Junction to Ambient

SYMBOL
θJA
RATINGS
68
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
(Limits in standard typeface are for TJ=25°C, unless otherwise specified.)
(VIN (Note 1) =VO (NOM) +1V, IL=10mA, CIN=10uF, COUT=10uF, VEN=VIN-0.3V)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage Tolerance
VO
VOUT+1V<VIN<5.5V
Adjustable Pin Voltage
VADJ
2.5V<VIN<5.5V
Line Regulation
∆VLINE
VOUT+1V<VIN<5.5V
Load Regulation (Note 2)
∆VLOAD
10mA<IL<3A
IL=300mA
Dropout Voltage (Note 3)
VDROP
IL=3A
IL=300mA
Ground Pin Current
IGND
IL=3A
Ground Pin Current
IGND_OFF
VEN<0.2V
f=1kHz
Power Supply Rejection Ratio
PSRR
f=1kHz, CFF=1uF
Thermal Shutdown Temperature
TSD
Logic Low
VIL
Output=Low
Enable threshold
Output=High
Logic High
VIH
Enable Input Current
IEN
VEN=VIN
MIN
-3
0.776
TYP
0
0.8
0.15
0.20
45
400
0.30
0.30
0.5
55
65
170
MAX
3
0.824
0.40
0.60
65
600
1.0
1.0
2
0
mV
mA
uA
dB
0.4
°C
V
V
1
uA
2.0
-1
UNIT
%
V
V/%
%
Notes: 1. The minimum operating value for input voltage is equal to either (VOUT, NOM+VDROP) or 2.5V, whichever is
greater.
2. Regulation is measured at constant junction temperature by using a 10ms current pulse. Devices are
tested for load regulation in the load range from 10mA to 3A.
3. Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2%
below the nominal value. Dropout voltage specification applies only to output voltages of 2.5V and above.
For output voltages below 2.5V, the dropout voltage is nothing but the input to output differential, since the
minimum input voltage is 2.5V.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LR18230
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CMOS IC
TYPICAL APPLICATION CIRCUIT
VIN
VIN
VOUT
UTC
LR18230
CIN
10uF
EN
VOUT
CFF
R2
COUT
10uF
ADJ
EN
GND
R1
Cff option notes: the capacitance of feed-forward capacitor with range of 10pF to 1uF
allows to achieve better PSRR performance when required by the application
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
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