UNISONIC TECHNOLOGIES CO., LTD
LR9273
Preliminary
CMOS IC
SUPER LOW ON
RESISTANCE/LOW VOLTAGE
1A LDO REGULATOR
DESCRIPTION
1
SOP-8
The UTC
LR9273
is a typical LDO (linear regulator) with features of
super low dropout, 1A output current capability, and -3mV typical load
regulation at 1A.
During operation of the UTC
LR9273,
the dropout voltage is very
low and the response of line transient and load transient are very well.
Internally, there’re many functions of UTC
LR9273
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
LR9273.
The UTC
LR9273
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.
SOT-89-5
FEATURES
60µA (Typ.)
0.1µA (Typ.)
0.18V (Typ.)
@I
OUT
=1A, V
OUT
=2.85V
70dB (Typ.)
@f=1kHz,V
OUT
=2.85V
±100ppm/°C (Typ.)
* Ultra Supply Current:
* Standby Mode:
* Very Low Dropout Voltage:
* Ripple Rejection:
* Temperature-Drift Coefficient
of Output Voltage:
* Well Line Regulation:
0.02%/ V (Typ.)
* Output Voltage Accuracy:
±1.5% (Typ.)
* Internal Fold Back Protection
250mA (Typ.) @ short mode
Circuit:
* C
IN
=C
OUT
=4.7µF or more (Ceramic capacitors) are recommended
to be used with this IC
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 9
QW-R502-A30.a
LR9273
PIN CONFIGURATION
Preliminary
CMOS IC
PIN DESCRIPTION
PIN NAME
ADJ
NC
GND
CE
V
IN
V
OUT
DESCRIPTION
ADJUST Pin (For Adjustable Version)
No Connection (For Fixed Version)
Ground Pin
Chip Enable Pin. Active when this Pin is high.
Input Pin
Output Pin
SOT-89-5
PIN NO.
1
2
3
4
5
HSOP-8J
PIN NO.
PIN NAME
1
V
OUT
Output Pin
2
ON/OFF
ON/OFF Pin
3, 5, 6, 7
NC
No connection (Note)
4
VSS
GND Pin
8
V
IN
Input Pin
Note: The NC pin is electrically open.
The NC pin can be connected to V
IN
or V
SS
.
DESCRIPTION
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 9
QW-R502-A30.a
LR9273
ABSOLUTE MAXIMUM RATING
PARAMETER
Preliminary
CMOS IC
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
6.5
V
Input Voltage (CE Pin)
V
CE
-0.3~6.5
V
Output Voltage
V
OUT
-0.3~ V
IN
+0.3
V
Power Dissipation
P
D
900
mW
Operating Temperature
T
OPT
-40~+85
°С
Storage Temperature
T
STG
-55~+125
°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.
ELECTRICAL CHARACTERISTICS
MIN
1.4
TYP
60
0.1
×0.98
-30
-15
-2
-3
0.33
0.22
0.18
0.10
0.05
0.72
0.64
0.56
0.32
0.18
0.05
70
60
0.57
0.47
0.32
0.15
0.10
MAX UNIT
6.0
V
100
µA
1.0
µA
×1.02
V
+30
mV
15
mV
mV
V
V
V
V
V
V
V
V
V
V
%/V
dB
dB
LR9273B/D-xx (Fixed Output Voltage Type)
PARAMETER
SYMBOL
TEST CONDITIONS
Input Voltage
V
IN
Supply Current
I
SS
V
IN
−V
OUT
=1.0V, V
CE
=V
IN
, I
OUT
=0A
Standby Current
Istandby V
IN
=6.0V, V
CE
=0V
V
OUT
>1.5V
V
IN
−V
OUT
=1.0V,
Output Voltage
V
OUT
I
OUT
=100mA
V
OUT
≤1.5V
V
IN
−V
OUT
=0.3V, 1mA≤I
OUT
≤300mA,
If
∆V
OUT
V
OUT
≤1.1V,
then V
IN
=1.4V
Load Regulation
∆I
OUT
V
IN
−V
OUT
=0.3V, 1mA≤I
OUT
≤1A,
If
V
OUT
≤1.1V,
then V
IN
=1.7V
0.8≤V
OUT
<0.9
0.9≤V
OUT
<1.0
I
OUT
=300mA
1.0≤V
OUT
<1.5
1.5≤V
OUT
<2.6
Dropout Voltage
2.6≤V
OU
V
DIF
(T
OPT
=25°C)
0.8≤V
OUT
<0.9
0.9≤V
OUT
<1.0
I
OUT
=1A
1.0≤V
OUT
<1.5
1.5≤V
OUT
<2.6
2.6≤V
OU
∆V
OUT
I
OUT
=100mA, V
OUT
+0.5V≤
VIN
≤6.0V,
Line Regulation
∆V
IN
If V
OUT
≤0.9V,
1.4V≤VIN≤6.0V
f=1kHz (V
OUT
≤4.0V)
f=1kHz (V
OUT
>4.0V)
Ripple 0.5Vp-p,VI
N
−V
OUT
=1.0V,
I
OUT
=100mA, If V
OUT
≤1.2V,
V
IN
−V
OUT
=1.5V,
I
OUT
=100mA
I
OUT
=100mA, -40°С≤T
OPT
≤85°С
V
IN
-V
OUT
=1.0V
V
OUT
=0V
0.20
Ripple Rejection
RR
Output Voltage Temperature
Coefficient
Output Current
Short Current Limit
Pull-Down Resistance for
CE PIn
High
CE Input Voltage
Low
Thermal Shutdown Detector
Threshold Temperature
Thermal Shutdown
Released Temperature
Output Noise
∆V
OUT
∆T
OPT
±100
1
250
1.9
1.0
0
5.0
15.0
6.0
0.4
150
120
30
ppm/°С
A
mA
MΩ
V
V
°С
°С
µVrms
5 of 9
QW-R502-A30.a
I
LIM
I
SC
R
PD
V
CEH
V
CEL
T
TSD
T
TSR
en
Junction temperature
Junction temperature
BW=10Hz~100kHz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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