LP2952/LP2952A/LP2953/LP2953A Adjustable Micropower Low-Dropout Voltage Regulators
March 2005
LP2952/LP2952A/LP2953/LP2953A
Adjustable Micropower Low-Dropout Voltage Regulators
General Description
The LP2952 and LP2953 are micropower voltage regulators
with very low quiescent current (130 µA typical at 1 mA load)
and very low dropout voltage (typ. 60 mV at light load and
470 mV at 250 mA load current). They are ideally suited for
battery-powered systems. Furthermore, the quiescent cur-
rent increases only slightly at dropout, which prolongs bat-
tery life.
The LP2952 and LP2953 retain all the desirable character-
istics of the LP2951, but offer increased output current,
additional features, and an improved shutdown function.
The internal crowbar pulls the output down quickly when the
shutdown is activated.
The error flag goes low if the output voltage drops out of
regulation.
Reverse battery protection is provided.
The internal voltage reference is made available for external
use, providing a low-T.C. reference with very good line and
load regulation.
The parts are available in DIP and surface mount packages.
Features
n
n
n
n
n
n
n
n
n
n
Output voltage adjusts from 1.23V to 29V
Guaranteed 250 mA output current
Extremely low quiescent current
Low dropout voltage
Extremely tight line and load regulation
Very low temperature coefficient
Current and thermal limiting
Reverse battery protection
50 mA (typical) output pulldown crowbar
5V and 3.3V versions available
LP2953 Versions Only
n
Auxiliary comparator included with CMOS/TTL
compatible output levels. Can be used for fault
detection, low input line detection, etc.
Applications
n
n
n
n
High-efficiency linear regulator
Regulator with under-voltage shutdown
Low dropout battery-powered regulator
Snap-ON/Snap-OFF regulator
Block Diagrams
LP2952
LP2953
01112702
01112701
© 2005 National Semiconductor Corporation
DS011127
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LP2952/LP2952A/LP2953/LP2953A
Pinout Drawings
LP2952
14-Pin DIP
Ordering Information
LP2952
Order
Number
LP2952IN,
LP2952AIN,
LP2952IN-3.3,
LP2952AIN-3.3
01112711
Temp.
Range
(T
J
) ˚C
−40 to
+125
Package
NSC
Drawing
Number
N14A
14-Pin
Molded
DIP
16-Pin
Surface
Mount
LP2953
16-Pin DIP
LP2952IM,
LP2952AIM,
LP2952IM-3.3,
LP2952AIM-3.3
−40 to
+125
M16A
LP2953
Order
Number
LP2953IN,
LP2953AIN,
LP2953IN-3.3,
LP2953AIN-3.3
01112713
Temp.
Range
(T
J
) ˚C
−40 to
+125
Package
NSC
Drawing
Number
N16A
16-Pin
Molded DIP
LP2952
16-Pin SO
LP2953IM,
LP2953AIM,
LP2953IM-3.3,
LP2953AIM-3.3
LP2953AMJ/883
5962-9233601MEA
LP2953AMJ-QMLV
5962-9233601VEA
LP2953AMWG/883
5962-9233601QXA
LP2953AMWG-QMLV
5962-9233601VXA
−40 to
+125
16-Pin
Surface
Mount
16-Pin
Ceramic DIP
M16A
−55 to
+150
J16A
−55 to
+150
16-Pin
Ceramic
Surface
Mount
WG16A
01112712
LP2953
16-Pin SO
01112714
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2
LP2952/LP2952A/LP2953/LP2953A
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Temperature Range
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3
LP2953AM
Lead Temp. (Soldering, 5 seconds)
Power Dissipation (Note 2)
−65˚C
≤
T
A
≤
+150˚C
Maximum Junction Temperature
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3
LP2953AM
Input Supply Voltage
Feedback Input Voltage (Note 3)
Comparator Input Voltage (Note 4)
Shutdown Input Voltage (Note 4)
Comparator Output Voltage (Note
4)
ESD Rating (Note 15)
+125˚C
+150˚C
−20V to +30V
−0.3V to +5V
−0.3V to +30V
−0.3V to +30V
−0.3V to +30V
2 kV
−40˚C
≤
T
J
≤
+125˚C
−55˚C
≤
T
A
≤
+125˚C
260˚C
Internally Limited
Limits in standard typeface are for T
J
= 25˚C,
bold typeface
applies over the full
operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical
Quality Control (SQC) methods. Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
L
= 2.2 µF for 5V parts and
4.7µF for 3.3V parts. Feedback pin is tied to V Tap pin, Output pin is tied to Output Sense pin.
Electrical Characteristics
3.3V Versions
Symbol
V
O
Parameter
Output Voltage
1 mA
≤
I
L
≤
250 mA
Conditions
Typical
3.3
3.3
LP2952AI-3.3, LP2953AI-3.3
Min
3.284
3.260
3.254
Max
3.317
3.340
3.346
LP2952I-3.3, LP2953I-3.3
Min
3.267
3.234
3.221
Max
3.333
3.366
3.379
V
Units
5V Versions
Symbol
Parameter
Conditions
Typical
LP2952AI, LP2953AI,
LP2953AM
(Note 17)
Min
V
O
Output Voltage
1 mA
≤
I
L
≤
250 mA
5.0
5.0
4.975
4.940
4.930
Max
5.025
5.060
5.070
Min
4.950
4.900
4.880
Max
5.050
5.100
5.120
V
LP2952I, LP2953I
Units
All Voltage Options
Electrical Characteristics
Limits in standard typeface are for T
J
= 25˚C,
bold typeface
applies over the full operating temperature range. Limits are guar-
anteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless other-
wise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
L
= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
Tap pin, Output pin is tied to Output Sense pin.
Symbol
Parameter
Conditions
Typical LP2952AI, LP2953AI, LP2952I, LP2953I,
LP2952AI-3.3,
LP2952I-3.3,
LP2953AI-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min
REGULATOR
Output Voltage Temp.
Coefficient
Output Voltage Line
Regulation
(Note 5)
20
100
150
ppm/˚C
Max
Min
Max
Units
V
IN
= V
O
(NOM) + 1V to 30V
0.03
0.1
0.2
0.2
0.4
%
3
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LP2952/LP2952A/LP2953/LP2953A
All Voltage Options
(Continued)
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
J
= 25˚C,
bold typeface
applies over the full operating temperature range. Limits are guar-
anteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless other-
wise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
L
= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
Tap pin, Output pin is tied to Output Sense pin.
Parameter
Conditions
Typical LP2952AI, LP2953AI, LP2952I, LP2953I,
LP2952AI-3.3,
LP2952I-3.3,
LP2953AI-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min
Output Voltage Load
Regulation (Note 6)
I
L
= 1 mA to 250 mA
I
L
= 0.1 mA to 1 mA
I
L
= 1 mA
I
L
= 50 mA
I
L
= 100 mA
I
L
= 250 mA
60
240
310
470
130
1.1
4.5
21
165
105
380
0.05
0.04
Max
0.16
0.20
100
150
300
420
400
520
600
800
170
200
I
L
= 50 mA
I
L
= 100 mA
I
L
= 250 mA
2
2.5
6
8
28
33
210
240
140
500
530
Thermal Regulation
(Note 10)
0.2
Min
Max
0.20
0.30
100
150
300
420
400
520
600
800
170
200
2
2.5
6
8
28
33
210
240
140
500
530
0.2
%/W
µA
mA
µA
mA
µA
mV
%
Units
Symbol
V
IN
–V
O
Dropout Voltage
(Note 7)
I
GND
Ground Pin Current
(Note 8)
I
L
= 1 mA
I
GND
I
GND
I
LIMIT
Ground Pin Current at
Dropout
Ground Pin Current at
Shutdown (Note 8)
Current Limit
V
IN
= V
O
(NOM) −0.5V
I
L
= 100 µA
V
SHUTDOWN
≤
1.1V
V
OUT
= 0
e
n
Output Noise Voltage
(10 Hz to 100 kHz)
I
L
= 100 mA
Reference Voltage
Reference Voltage Line
Regulation
C
L
= 4.7 µF
C
L
= 33 µF
C
L
= 33 µF (Note 11)
(Note 12)
V
IN
= 2.5V to V
O
(NOM) + 1V
V
IN
= V
O
(NOM) + 1V to 30V
(Note 13)
400
260
80
1.230
0.03
1.215
1.205
1.245
1.255
0.1
0.2
0.25
0.4
0.6
20
1.205
1.190
1.255
1.270
0.2
0.4
0.8
1.0
µV
RMS
V
%
V
REF
Reference Voltage Load I
REF
= 0 to 200 µA
Regulation
Reference Voltage
Temp. Coefficient
(Note 5)
%
ppm/˚C
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4
LP2952/LP2952A/LP2953/LP2953A
All Voltage Options
(Continued)
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
J
= 25˚C,
bold typeface
applies over the full operating temperature range. Limits are guar-
anteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless other-
wise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
L
= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
Tap pin, Output pin is tied to Output Sense pin.
Parameter
Conditions
Typical LP2952AI, LP2953AI, LP2952I, LP2953I,
LP2952AI-3.3,
LP2952I-3.3,
LP2953AI-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min
Max
40
60
(Note 9)
30
20
0.01
150
−60
−85
15
−80
−95
(Note 14)
(Note 14)
(Referred to V
REF
)
−110
−160
1
2
250
400
−35
−25
−55
−40
−80
−95
−110
−160
30
20
1
2
250
400
−35
−25
−55
−40
mV
−7.5
−10
6
V
IN
(S/D) = 0V to 5V
LP2953AM
10
10
−30
−50
−30
−75
30
50
30
75
7.5
10
7.5
12
mV
−30
−50
LP2953AM
10
0.01
LP2953AM
0.01
150
LP2953AM
150
−30
−75
30
50
30
75
1
2
1
2.2
250
400
250
420
250
400
mV
1
2
µA
−30
−50
30
50
nA
−7.5
−10
7.5
10
mV
−30
−50
−30
50
7.5
10
−7.5
−10
7.5
10
mV
nA
mV
mV
mV
mV
µA
Min
Max
40
60
mA
nA
20
Units
Symbol
I
B
(FB)
Feedback Pin Bias
Current
I
O
(SINK) Output “OFF” Pulldown
Current
I
OH
V
OL
V
THR
(MAX)
V
THR
(MIN)
HYST
V
OS
HYST
I
B
DROPOUT DETECTION COMPARATOR
Output “HIGH” Leakage V
OH
= 30V
Output “LOW” Voltage
Upper Threshold
Voltage
Lower Threshold
Voltage
Hysteresis
Input Offset
Voltage
Hysteresis
Input Bias
Current
V
IN
= V
O
(NOM) − 0.5V
I
O
(COMP) = 400 µA
(Note 14)
SHUTDOWN INPUT
(Note 15)
±
3
AUXILIARY COMPARATOR (LP2953 Only)
V
OS
Input Offset Voltage
(Referred to V
REF
)
LP2953AM
HYST
I
B
Hysteresis
Input Bias Current
V
IN
(COMP) = 0V to 5V
±
3
±
3
6
10
−7.5
−10
−7.5
−12
I
OH
Output “HIGH” Leakage V
OH
= 30V
V
IN
(COMP) = 1.3V
V
OL
Output “LOW” Voltage
V
IN
(COMP) = 1.1V
I
O
(COMP) = 400 µA
5
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