UNISONIC TECHNOLOGIES CO., LTD
LR1122B
LOW NOISE 200 mA LDO
REGULATOR
DESCRIPTION
The UTC
LR1122B
is a typical LDO (linear regulator) with the
features of High output voltage accuracy, low supply current, low
ON-resistance, and high ripple rejection.
During operation of the UTC
LR1122B,
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
LR1122B
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
LR1122B.
The UTC
LR1122B
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.
CMOS IC
FEATURES
*
Ultra Supply Current: 18µA (Typ.)
*
Standby Mode: 0.1µA (Typ.)
*
Very Low Dropout Voltage: 0.13V (Typ.)
@I
OUT
=150mA, V
OUT
=2.85V
*
Ripple Rejection: 75dB (Typ.)
@f=1kHz,V
OUT
=2.85V
*
Temperature-Drift Coefficient of Output Voltage:
±30ppm/°C
(Typ.)
*
Well Line Regulation: 0.02%/ V (Typ.)
*
Output Voltage Accuracy:
±0.8%
(Typ.)
*
Internal Fold Back Protection Circuit: 40mA (Typ.)
@
short mode
*
C
IN
=C
OUT
=1µF or more (Ceramic capacitors) are Recommended to be used with this IC
ORDERING INFORMATION
Ordering Number
Package
LR1122BG-xx-AF5-R
SOT-25
Note: xx: Output Voltage, refer to Marking Information.
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
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QW-R502-320.B
LR1122B
ABSOLUTE MAXIMUM RATING
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
6.0
V
Input Voltage(CE Pin)
V
CE
6.0
V
Output Voltage
V
OUT
-0.3~ V
IN
+0.3
V
Output Current
I
OUT
300
mA
Power Dissipation
P
D
420
mW
Junction Temperature
T
J
+125
°С
Operating Temperature
T
OPR
-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
(Ta=25°С, V
IN
=Set V
OUT
+1V, I
OUT
=1mA, C
I
=C
O
=1µF, unless otherwise specified)
LR1122B-1.6V
PARAMETER
Output Voltage
Input Voltage (Note)
Load Regulation
Output Current
Supply Current
Supply Current (Standby)
Short Current Limit
CE Pull-down Current
CE Input Voltage
Output Noise
Ripple Rejection
Dropout Voltage
Line Regulation
Output Voltage Temperature
Coefficient
High
Low
SYMBOL
TEST CONDITIONS
V
OUT
V
IN
= Set V
OUT
+1V
V
IN
ΔV
OUT
1mA≤I
OUT
≤150mA
ΔI
OUT
I
OUT
I
SS
I
ST-BY
I
LIMIT
I
PD
V
CEH
V
CEL
eN
RR
V
D
ΔV
OUT
ΔV
IN
ΔV
OUT
ΔT
MIN
1.587
TYP
MAX
1.613
5.0
40
UNIT
V
V
mV
mA
µA
µA
mA
µA
V
V
µVrms
dB
20
200
I
OUT
=0A
V
CE
=0V
V
OUT
=0V
1.5
18
0.1
40
0.3
25
2
0.3
B
W
=10Hz to 100kHz, I
OUT
=30mA
f=1kHz, Ripple 0.2V
P-P
V
IN
=Set V
OUT
+1V, I
OUT
=30mA
(In case that V
OUT
=2.0V, V
IN
=3V)
I
OUT
=150mA
Set V
OUT
+0.5V≤V
IN
≤5V
-40°С≤T
OPR
≤85°С
30
75
0.24
0.02
±30
0.38
0.10
V
%/V
ppm/°С
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-320.B
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