LP2950/2951 100 mA LOW-DROPOUT VOLTAGE REGULATOR
UNISONIC TECHNOLOGIES CO., LTD
LP2950/2951
LINEAR INTEGRATED CIRCUIT
100 mA LOW-DROPOUT
VOLTAGE REGULATOR
1
TO-92
DESCRIPTION
The UTC LP2950/2951 are monolithic integrated voltage
regulators with low dropout voltage, and low quiescent current. It
includes many features that suitable for different applications.
SOP-8
FEATURES
* Fixed output versions, 2.5V, 3V, 3.3V, 3.6V and 5V, are available.
* High accuracy output voltage.
* 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 err flog available for 8 pin package.
* Output voltage programmable for LP2951.
DIP-8
*Pb-free plating product number:
LP2950L-XX/LP2951L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
LP2950-xx-D08-T
LP2950L-xx-D08-T
LP2950-xx-S08-T
LP2950L-xx-S08-T
LP2950-xx-S08-R
LP2950L-xx-S08-R
LP2950-xx-T92-B
LP2950L-xx-T92-B
LP2950-xx-T92-K
LP2950L-xx-T92-K
LP2951-D08-T
LP2951L-D08-T
LP2951-S08-T
LP2951L-S08-T
LP2951-S08-R
LP2951L-S08-R
Note: xx: Output Voltage Code (For LP2950 only)
Package
Packing
DIP-8
SOP-8
SOP-8
TO-92
TO-92
DIP-8
SOP-8
SOP-8
Tube
Tube
Tape Reel
Tape Box
Bulk
Tube
Tube
Tape Reel
LP2950L-xx-S08-R
(1)Packing Type
(1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube
(2)Package Type
(2) D08: DIP-8, S08: SOP-8, T92: TO-92
(3)Output Voltage Code
(3) xx: refer to Output Voltage Code
(4)Lead Plating
(4) L: Lead Free Plating, Blank: Pb/Sn
OUTPUT VOLTAGE CODE(For LP2950)
OUTPUT VOLTAGE
2.5V
3.0V
3.3V
3.6V
5.0V
CODE
25
30
33
36
50
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Copyright © 2005 Unisonic Technologies Co., Ltd
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
UTC LP2950
1
2
OUTPUT
1
SENSE
2
8
INPUT
7
FEEDBACK
OUTPUT
1
NC
2
8
INPUT
3
OUTPUT
INPUT
SHUTDOWN
3
GND
4
GND
TO-92 Plastic Package
Bottom View
UTC
LP2951
6
5V TAP
5
ERROR
SHUTDOWN
3
GND
4
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2951
7
NC
6
NC
5
ERROR
UTC
LP2950
SOP-8 OR DIP-8 PACKAGE
FOR UTC LP2950
BLOCK DIAGRAM
UNREGULATED
DC
FEEDBACK
INPUT
7
8
OUTPUT
5V 150mA
MAX.
1
SENSE
2
182kΩ
FROM CMOS
OR TTL
SHUT
DOWN
3
ERROR
AMPLIFIER
5V TAP
6
330KΩ
1.5 μF
60mV
60kΩ
ERROR
ERROR
DETECTION
COMPARATOR
1.23
REF
5
TO CMOS
OR TTL
GND
4
FOR UTC LP2951
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www.unisonic.com.tw
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.3 ~ +30
V
Feedback Voltage
VFB
-1.5 ~ +30
V
Shutdown Voltage
VSHDN
-0.3 ~ +30
V
Operation Junction Temperature
TJ
-40 ~ +125
°C
Storage Temperature
TSTG
-65 ~ +150
°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 (TJ=25°C, VIN=6V, IL=100µA, CL=1µF, unless otherwise specified.)
For All Version:
PARAMETER
SYMBOL
Output Voltage
VOUT
Output Voltage
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
VOUT
Dropout Voltage
Ground Current
Dropout Ground Current
Current Limit
Output Noise (10Hz ~ 100KHz)
(Bypass=0.01µF pins 7 to 1
(LP2951))
TEST CONDITION
MIN
TJ=25°C (Note 1)
VOUT×0.98
-25°C≦TJ≦+85°C(Note 1)
VOUT×0.98
100µA≦IL≦100mA, TJ≦TJ(max) VOUT×0.98
TcVo
ΔVOUT 6V≦VIN≦30V
ΔVOUT 100µA≦IL≦100 mA
IL=100µA
VD
IL=100mA (Note 2)
IL=100µA
IG
IL=100mA
VIN=4.5V,IL=100µA
ILIMIT VOUT=0
CL=1µF
eN
CL=200µF
CL=3.3µF
TYP
MAX
VOUT VOUT×1.02
VOUT VOUT×1.02
VOUT VOUT×1.02
20
0.03
0.04
50
380
75
8
110
160
0.1
0.1
80
450
120
12
170
200
UNIT
V
V
V
100
ppm/°C
0.2
0.2
150
600
140
14
200
220
430
160
100
%
%
mV
µA
mA
µA
mA
MAX
1.25
1.27
40
UNIT
V
V
nA
µV
For UTC LP2951 8-Pin Version Only
PARAMETER
SYMBOL
TEST CONDITION
VREF
Reference Voltage
VREF Over temperature(Note 4)
Reference Voltage
Feedback pin Bias Current
IFB
Reference Voltage Temperature
VREF(TC)
Coefficient
Feedback Bias Current
IFB(TC)
Temperature Coefficient
Error Comparator
Output Leakage Current
IO(LEAK) VOH=30V
Output Low Voltage
VOL
VIN=4.5V, IOL=400µA
VTHU (Note 3)
Upper
Threshold Voltage
VTHL (Note 3)
Lower
VHYS (Note 3)
Hysteresis
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
1.22
1.19
TYP
1.235
20
50
ppm/°C
0.1
nA/°C
1
250
3.2
7.6
15
µA
mV
%VO
%VO
mV
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For UTC LP2951 8-Pin Version Only
PARAMETER
Shutdown Input
SYMBOL
MIN
TYP
MAX
UNIT
Regulator ON
1.3
0.70
V
Regulator OFF
2.0
VSHDN=2.4V
30
50
µA
Shutdown Pin Input Current
ISHDN
VSHDN=30V
450
600
µA
VSHDN≧2V, VIN≦30V, VOUT=0
Regulator Output Current
IDFF
3
10
µA
Shutdown
Feedback pin tied to 5V Tap.
Note 1:Additional conditions for 8-pin versions are FB pin tied to 5VTAP, Output tied to Sense(VOUT=5V) and
VSHDN≤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.
Note 4: VREF≤VOUT≤(VIN-1V), 2.3V≤VIN≤30V, 100µA≤IL≤100mA, TJ≤TJ(MAX)
Input Logic Voltage
Low
High
TEST CONDITION
VIL
VIH
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
10 Ampere Low Dropout Regulator
CURRENT LIMIT
SECTION
+V IN=Vou t+0.5V
680Ω
0.05Ω
2N3906
UTC
D65H0
470Ω
8
+VIN
4.7MΩ
ERROR
5
UTC LP2951
3
220Ω
20kΩ
+ VOUT 100m A
10kΩ
R1
100µF
SD
FB
GND
4
7
Vout
1%
4.7µF
R2
1
47Ω
0.033µF
VOUT=1.23V*(1+R1/R2)
For 5V output use internal resistors.Wire pin 6 to 7 and wire pin 2 to +VOUT
Fig.1
V IN
UTC
UTC
UTC
UTC
UTC
LP2950-2.5
LP2950-3.0
LP2950-3.3
LP2950-3.6
LP2950-5.0
V OUT
Fig.2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Dropout Characteristics
Input Current
6
RL=50kΩ
4
Input Current (mA)
Output Voltage (V)
5
RL=50Ω
3
2
1
0
0
1
3
4
2
Input Voltage (V)
5
6
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
R L= 50Ω
0 1
2 3 4 5 6 7 8 9 10 11 12
Input Voltage (V)
Ground Pin Current
Ground Pin Current
8
120
Quiescent Current (mA)
Quiescent Current (mA)
110
100
VIN =6V
I L=100µA
90
80
70
7
V IN = 6V
IL =100mA
6
5
60
50
4
-75 -50 -25
0
25
50 75 100 125 150
-75 -50 -25
Temperature (℃)
0
25
50 75
100125 150
Temperature (℃)
Dropout Voltage
Shutdown Threshold Voltage
1.8
IL =100mA
500
Dropout Voltage (mV)
Shutdown Threshold Voltage (V)
600
400
300
200
IL =100µA
≈
100
50
0
-75 -50 -25
1.6
1.4
1.2
1.0
0.8
0.6
0
25
50 75
100125 150
Temperature (℃)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
-75 -50 -25
0 25 50 75 100125 150
Temperature (℃)
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LP2950/2951
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
Dropout Voltage
Short Circuit Current
500
400
160
D rop ou t Voltag e(mV)
Short Circuit Current (mA)
170
150
140
130
120
300
200
T J=25℃
100
110
100
-75 -50 -25
0
0
25
50 75 100 125 150
Temperature (℃)
0.1
1
10
100
Output Current (mA)
UTC assum es no responsibility for equipm ent failures that result from using products at v alues that
exceed, ev en m om entarily, rated v alues (such as m axim um ratings, operating condition ranges, or
other param eters) 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 system s where
m alfunction 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 inform ation
presented in this docum ent does not form part of any quotation or contract, is believ ed to be accurate
and reliable and m ay be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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