Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1121B
CMOS IC
HIGH RIPPLE-REJECTION LDO
REGULATOR
„
DESCRIPTION
3
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.
„
2
1
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, IOUT = 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 (@ VIN ≥ VOUT(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
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
Package
Packing
SOT-25
SOT-25
Tape Reel
Tape Reel
1 of 7
QW-R502-101.E
LR1121B
„
MARKING INFORMATION
PACKAGE
SOT-25
„
VOLTAGE CODE
21:2.1V
22:2.2V
23:2.3V
24:2.4V
25:2.5V
26:2.6V
27:2.7V
28:2.8V
2J:2.85V
29:2.9V
30:3.0V
31:3.1V
32:3.2V
33:3.3V
34:3.4V
35:3.5V
36:3.6V
37:3.7V
38:3.8V
39:3.9V
40:4.0V
41:4.1V
42:4.2V
43:4.3V
44:4.4V
45:4.5V
46:4.6V
47:4.7V
48:4.8V
49:4.9V
MARKING
50:5.0V
51:5.1V
52:5.2V
53:5.3V
54:5.4V
55:5.5V
5
Pin Code
4
Voltage Code
L: Lead Free
G: Halogen Free
K
1
2
3
PIN DESCRIPTION
PIN NO.
A
5
2
1
3
4
„
CMOS IC
B
1
2
3
4
5
SYMBOL
VOUT
VSS
VIN
ON/OFF
NC*
DESCRIPTION
Output pin
GND pin
Input pin
Chip enable pin
No connection (The NC pin is electrically open or connected to VIN or VSS.)
BLOCK DIAGRAM
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QW-R502-101.E
LR1121B
„
CMOS IC
ABSOLUTE MAXIMUM RATINGS (TA=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
VIN
7
V
Input Voltage
VON/OFF
0.3 ~ VIN+0.3
V
Output Voltage
VOUT
-0.3 ~ VIN+0.3
V
Power Dissipation
PD
280
mW
Junction Temperature
TJ
125
°C
Operating Temperature
TOPR
-40 ~ +85
°C
Storage Temperature
TSTG
-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 (TA=25°C, unless otherwise specified.)
SYMBOL
TEST
CIRCUIT
TEST CONDITIONS
Output Voltage
VOUT
1
VIN=VOUT+1.0V, IOUT=30mA
Output Current
Input Voltage
IOUT
VIN
△VOUT(LINE)
△VIN×VOUT
3
VIN≧VOUT+1.0V
PARAMETER
Line Regulation
1
Load Regulation
△VOUT(LOAD)
1
Output Voltage
Temperature Coefficient
△VOUT
△Ta×VOUT
1
Supply Current
ISS1
2
Supply Current During
standby
ISS2
2
ISHORT
3
VSH
VSL
ISH
ISL
4
4
4
4
RR
5
Short Circuit Current
Shutdown Pin Input
Voltage
Shutdown Pin Input
Current
High
Low
High
Low
Ripple Rejection
„
VOUT+0.5V≤VIN≤7V
IOUT=30mA
VIN=VOUT+1.0V
1.0mA≤IOUT≤80mA
VIN=VOUT+1.0V, IOUT=30mA
-40°C ≤Ta≤85°C
VIN=VOUT+1.0V, ON/OFF
pin=ON, no load
VIN=VOUT+1.0V, ON/OFF
pin=OFF, no load
VIN=VOUT+1.0V, ON/OFF
pin=ON, VOUT=0V
VIN=VOUT+1.0V, RL=10KΩ
VIN=VOUT+1.0V, RL=10KΩ
VIN=7V, VON/OFF= VIN
VIN=7V, VON/OFF= VSS
VIN=VOUT+1.0V, f=1.0kHz
Ripple 0.5Vp-p
MIN
TYP
VOUT
×0.98
200
2.0
MAX
UNIT
VOUT
×1.02
V
7
mA
V
0.04
0.2
%/V
15
40
mV
±100
ppm/°C
30
65
0.1
1.0
μA
230
1.6
0
-0.1
-0.1
mA
VIN
0.3
0.1
0.1
70
V
μA
dB
ELECTRICAL CHARACTERISTICS OF DROPOUT VOLTAGE (TA=25°C)
Output Voltage VOUT(V)
2.1V≤VOUT(S)≤2.4V
2.5V≤VOUT(S)≤2.7V
2.8V≤VOUT(S)≤3.3V
3.4V≤VOUT(S)≤5.5V
Condition
IOUT=100mA
UNISONIC TECHNOLOGIES CO., LTD
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VD (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
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LR1121B
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CMOS IC
TEST CIRCUIT
Note:
Input capacitor (CIN): 1.0 μF or more
Output capacitor (CL): 2.2μF or more (tantalum capacitor)
„
SELECTION OF OUTPUT CAPACITOR (CL)
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 (CL) of 2.2 μF or more between VOUT and VSS 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.
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QW-R502-101.E
LR1121B
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CMOS IC
TYPICAL CHARACTERISTICS
VOUT (V)
VOUT (V)
(1) Output voltage vs. Input voltage
(2) Output Voltage vs. Output current
(3) Output voltage vs. Ambient temperature
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QW-R502-101.E
LR1121B
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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
(4) Dropout voltage vs. Output current
(5) Ripple rejection
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IOUT (mA)
VOUT (V)
VOUT (V)
IOUT (mA)
(6) Load transient response characteristics
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LR1121B
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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
(7) Current consumption vs. Input voltage
LR1121B-5.0V
45
40
85 C
35
Iss1 (μA)
30
25
25 C
20
-40 C
15
10
5
0
0
2
4
6
8
VIN (V)
(8) Input transient response characteristics
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.
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www.unisonic.com.tw
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QW-R502-101.E
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