UNISONIC TECHNOLOGIES CO., LTD
LR1121B
HIGH RIPPLE-REJECTION LDO
REGULATOR
DESCRIPTION
The UTC
LR1121B
is CMOS-based voltage regulator ICs with
high output voltage accuracy, extremely low current, low
ON-resistance, and high Ripple Rejection.
An ON/OFF circuit enables the output to be turned off, ensuring a
long battery life. a built-in low on-resistance transistor provides a low
dropout voltage and large output current, and a built-in overcurrent
protector prevents the load current from exceeding the current
capacitance of the output transistor.
The line transient response and load transient of the UTC
LR1121B
is excellent.
3
2
1
CMOS IC
5
4
SOT-25
FEATURES
* Ultra-Low Supply Current :
During Operation: 30μA TYP.
During Standby: 0.1μA Typ.
* Output Voltage: 2.1V ~ 5.5V, Selectable in 0.1 V Steps.
* High Output Voltage Accuracy: ±2.0%
* Low Dropout Voltage: 180 mV Typ. (2.8 V Output Product, I
OUT
= 100 mA)
* High Ripple Rejection: 70 dB TYP. (@ 1.0 kHz)
* Low Temperature-Drift Coefficient of Output Voltage: ±100ppm/°C TYP.
* High Peak Current Capability: 150 mA Output is Possible (@ V
IN
≥
V
OUT(S)
+ 1.0 V)
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR1121BL-xx-AF5-A-R
LR1121BG-xx-AF5-A-R
LR1121BL-xx-AF5-B-R
LR1121BG-xx-AF5-B-R
Package
SOT-25
SOT-25
Packing
Tape Reel
Tape Reel
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Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 8
QW-R502-101.D
LR1121B
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
V
IN
7
V
Input Voltage
V
ON/OFF
0.3 ~ V
IN
+0.3
V
Output Voltage
V
OUT
-0.3 ~ V
IN
+0.3
V
Power Dissipation
P
D
280
mW
Junction Temperature
T
J
125
°C
Operating Temperature
T
OPR
-40 ~ +85
°C
Storage Temperature
T
STG
-40 ~ +125
°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.
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified.)
PARAMETER
Output Voltage
Output Current
Input Voltage
Line Regulation
Load Regulation
Output Voltage
Temperature Coefficient
Supply Current
Supply Current During
standby
Short Circuit Current
Shutdown Pin Input
Voltage
Shutdown Pin Input
Current
Ripple Rejection
High
Low
High
Low
SYMBOL
V
OUT
I
OUT
V
IN
△
V
OUT(LINE)
△
V
IN×
V
OUT
△
V
OUT(LOAD)
△
V
OUT
△
Ta×V
OUT
I
SS1
I
SS2
I
SHORT
V
SH
V
SL
I
SH
I
SL
RR
TEST
CIRCUIT
1
3
1
1
1
2
2
3
4
4
4
4
5
TEST CONDITIONS
V
IN
=V
OUT
+1.0V, I
OUT
=30mA
V
IN
≧
V
OUT
+1.0V
V
OUT
+0.5V≤V
IN
≤7V
I
OUT
=30mA
V
IN
=V
OUT
+1.0V
1.0mA≤I
OUT
≤80mA
V
IN
=V
OUT
+1.0V, I
OUT
=30mA
-40°C
≤Ta≤85°C
V
IN
=V
OUT
+1.0V, ON/OFF
pin=ON, no load
V
IN
=V
OUT
+1.0V, ON/OFF
pin=OFF, no load
V
IN
=V
OUT
+1.0V, ON/OFF
pin=ON, V
OUT
=0V
V
IN
=V
OUT
+1.0V, R
L
=10KΩ
V
IN
=V
OUT
+1.0V, R
L
=10KΩ
V
IN
=7V, V
ON/OFF
= V
IN
V
IN
=7V, V
ON/OFF
= V
SS
V
IN
=V
OUT
+1.0V, f=1.0kHz
Ripple 0.5Vp-p
MIN
V
OUT
×0.98
200
2.0
0.04
15
±100
30
0.1
230
1.6
0
-0.1
-0.1
70
V
IN
0.3
0.1
0.1
65
μA
1.0
mA
V
μA
dB
TYP
MAX
V
OUT
×1.02
7
0.2
40
UNIT
V
mA
V
%/V
mV
ppm/°C
ELECTRICAL CHARACTERISTICS OF DROPOUT VOLTAGE
(Ta=25°C)
Output Voltage V
OUT
(V)
2.1V≤V
OUT(S)
≤2.4V
2.5V≤V
OUT(S)
≤2.7V
2.8V≤V
OUT(S)
≤3.3V
3.4V≤V
OUT(S)
≤5.5V
Condition
I
OUT
=100mA
V
D
(Dropout Voltage)
MIN
TYP
0.22
0.20
0.18
0.15
MAX
0.70
0.35
0.30
0.26
UNIT
V
V
V
V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 8
QW-R502-101.D
LR1121B
TEST CIRCUIT
CMOS IC
Note:
Input capacitor (C
IN
): 1.0
μF
or more
Output capacitor (C
L
): 2.2μF or more (tantalum capacitor)
SELECTION OF OUTPUT CAPACITOR (C
L
)
In this IC, phase compensation and the output capacitor is made for securing stable operation even if the load
current is varied. Therefore, always place a capacitor (C
L
) of 2.2
μF
or more between V
OUT
and V
SS
pins. Using a
capacitor whose ESR is outside the optimum range (approximately 0.5 ~ 5Ω), whether larger or smaller, may cause
an unstable output, resulting in oscillation. For this reason, a tantalum electrolytic capacitor is recommended.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R502-101.D
Embedded System
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