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LP2950/2951 LINEARINTEGRATEDCIRCUIT
1
100 mA LOW-DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The Contek LP2950/2951 is a monolithic integrated voltage
regulator with low dropout voltage, and low quiescent current.
It includes many features that suitable for different
applications. Available in 3-pin TO-92, DIP-8 and SOP-8
packages.
FEATURES
*High accuracy 3.0, 3.3, or 5V fixed output for TO-92 package.
*Extremely low quiescent current and dropout voltage.
*Extremely tight load and line regulation.
*Current and thermal limiting.
*Very low temperature coefficient.
*Logic controlled shutdown and error flag available for DIP
and SOP package.
*Output voltage programmable for DIP and SOP package.
APPLICATIONS
*Battery powered equipment.
*High efficient linear regulator down to 1.24V.
*Cellular phones.
TO-92
SOP-8
DIP-8
1
ORDERING INFORMATION
PART NUMBER TEMPERATURE RANGE PACKAGE ACCURACY
Contek LP2950-3.0 -40 ~ +125 C 3-Pin TO-92 plastic 1.0%
Contek LP2950-3.3 -40 ~ +125 C 3-Pin TO-92 plastic 2.0%
Contek LP2950 -40 ~ +125 C 3-Pin TO-92 plastic 1.0%
Contek LP2951F -40 ~ +125 C 8-Pin SOP-8 plastic 2.0%
Contek LP2951P -40 ~ +125 C 8-Pin DIP-8 plastic 2.0%
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LP2950/2951 LINEARINTEGRATEDCIRCUIT
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PIN CONFIGURATIONS
1
2
3
4
8
7
6
5
INPUT
FEEDBACK
5V TAPSHUTDOWN
SENSE
OUTPUT
Contek
LP2951
GND
ERROR
213
OUTPUT
GND
INPUT
Contek LP2950
TO-92 Plastic Package
Bottom View
SOP-8 OR DIP-8 PACKAGE
Fig. 1
BLOCK DIAGRAM
5
4
6
2
187
3
60mV
330K
W
TOCMOS
ORTTL
5V150mA
MAX.
FEEDBACK INPUT OUTPUT
SENSE
5V TAP
GND
ERROR
DETECTION
COMPARATOR
ERROR
AMPLIFIER
FROM CMOS
ORTTL
1.23
REF
SHUT
DOWN
UNRAGULATED
DC
ERROR
182kW
60k W
1.5mF
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc -0.3~+30 V
Feedback Voltage Vfeedback -1.5~+30 V
Shutdown Voltage Vshutdown -0.3~+30 V
Comparator Output Voltage Vco -0.3~+30 V
Storage Temperature Tstr -65~+150 C
Operating Junction Temperature Tj -40~+125 C
Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LP2950/2951 LINEARINTEGRATEDCIRCUIT
3
ELECTRICAL CHARACTERISTICS
( Tested at Tj=25 C,VIN=6V,IL=100A and CL=1F.unless otherwise specified)
PARAMETER PART NUMBER TEST CONDITION MIN. TYP. MAX. UNIT
Output Voltage Contek LP2950-3.0
Contek LP2950-3.3
Contek LP2950
Contek LP2951
T
J=25 C
(note 1)
2.97
3.26
4.90
3.0
3.3
5.0
3.03
3.37
5.10
V
Contek LP2950-3.0
Contek LP2950-3.3
Contek LP2950
Contek LP2951
-25 C<=T
J<=<=+85 C
(note 1)
2.97
3.26
4.90
3.0
3.3
5.0
3.03
3.37
5.10
V
Output Voltage Contek LP2950-3.0
Contek LP2950-3.3
Contek LP2950
Contek LP2951
100mA<=I
L<=100 mA
Tj<=Tj(max)
(note 1)
2.97
3.26
4.90
3.0
3.3
5.0
3.03
3.37
5.10
V
Output Voltage
Temperature Coefficient
20 100 ppm/ C
Line Regulation 6V<=VIN<=30V 0.03 0.1 0.2 %
Load Regulation 100A<=IL<=100 mA 0.04 0.1 0.2 %
Dropout Voltage IL=100mA
I
L=100mA (note 2)
50
380
80
450
150
600
mV
Ground Current IL=100mA
I
L=100mA
75
8
120
12
140
14
mA
mA
Dropout Ground Current VIN=4.5V,I L=100mA 110 170 200 mA
Current Limit Vout=0 160 200 220 mA
Output Noise 10Hz to
100KHz
CL=1mF
C
L=200mF
C
L=3.3mF
(Bypass=0.01mF
pins 7 to (
Contek
2951)
430
160
100
mV
For 8-Pin version only
Reference Voltage 1.22 1.235 1.25 V
Reference Voltage (Note 7) 1.19 1.27 V
Feedback pin Bias
Current
20 40 nA
Reference Voltage
Temperature Coefficient
50 ppm/ C
Feedback Bias Current
temperature Coefficient
0.1 nA/ C
Error Comparator
Output Leakage Current VOH=30V 1 mA
Output Low Voltage VIN=4.5V
I
OL=400mA
250 mV
Upper Threshold
Voltage
(Note 3) 3.2 %VO
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LP2950/2951 LINEARINTEGRATEDCIRCUIT
4
PARAMETER PART NUMBER TEST CONDITION MIN. TYP. MAX. UNIT
Lower Threshold
Voltage
(Note 3) 7.6 %VO
Hysteresis (Note 3) 15 mV
Shutdown Input
Input Logic Voltage
Low(Regulator ON)
High(Regulator OFF) 2.0
1.3
0.70
V
Shutdown Pin Input
Current
Vshutdown=2.4V 30 50 mA
Vshutdown=30V 450 600 mA
Regulator Output
Current Shutdown
Vshutdown>=2V,V IN<=30V,
V
out=0,
Feedback pin tied to 5V Tap.
310mA
Note 1: Additional conditions for 8-pin versions are feedback tied to 5V Tap an Output tied to Output Sense
(V
out=5V) and Vshutdown<=0.8V.
Note 2:Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV
below its nominal value measured at 1V differential.
Note 3:Comparator thresholds are expressed in terms of percentage value of voltage output.
APPLICATION CIRCUIT (10 Ampere Low Dropout Regulator)
+V IN
FB
Vout
GND
SD
ERROR
Contek LP2951
8
5
7
14
3
CURRENT
LIMIT
SECTION
+V
IN =V ou t+0.5V
0.05
470 W
680 W
4.7M W
20k W
220 W
0.033 m F
47W
R1
R2
4.7 m F
100 m F
1%
10k W
2N3906
+ V OUT 100m A
Vout=1.23V*(1+R1/R2)
For 5V output use internal resistors.Wire pin 6 to 7
and wire pin 2 to +V
out
Contek
D65H0
Fig.2
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
Page 5
LP2950/2951 LINEARINTEGRATEDCIRCUIT
5
Contek LP2950-3.0
Contek LP2950-3.3
Contek LP2950-5.0
Vin Vout
Fig. 3
TYPICAL PERFORMANCE CHARACTERISTICS
1
2
34 560
0
1
2
3
4
5
6
Fig.4Dropout Characteristics
INPUTVOLTAGE(V)
OUTPUT VOLTAGE(V)
RL=50kW
RL=50
W
01 2345678 9101112
0
10
20
30
40
50
60
70
80
90
100
120
110
130
140
150
Fig.5 Input Current
INPUT CURRENT(mA)
INPUTVOLTAGE(V)
RL=50
50
60
70
80
90
100
110
120
-75 -50 -25 0 25 50 75 100125 150
Fig.7Ground PinCurrent
QUIESCENT CURRENT(
m
A)
TEMPERATURE(C)
VIN=6V
I
L=100mA
-75 -50 -25 0 25 50 75 100125 150
4
5
6
7
8
TEMPERATURE(
C)
Fig.8 Ground PinCurrent
QUIESCENT CURRENT(mA)
VIN=6V
IL=100mA
-75 -50 -25 0 25 50 75 100125 150
100
110
120
130
140
150
160
170
TEMPERATURE(C)
SHORT CIRCUIT CURRENT(mA)
Fig.10Short Circuit Current
-75 -50 -25 0 25 50 75 100125 150
0
50
100
300
400
500
600
TEMPERATURE( C)
DROPOUT VOLTAGE(mV)
Fig.6Dropout Voltage
IL=100mA
IL=100mA
-75 -50 -25 0 25 50 75 100125 150
TEMPERATURE(
C)
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Fig.9 Shutdown Threshold Voltage
Shutdown Threshold Voltage(V)
0.1 1
10
100
0
100
200
300
400
500
Fig.11Dropout Voltage
OUTPUTCURRENT(mA)
Dropout Voltage(mV)
*
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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