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LP2952/LP2952A/LP2953/LP2953A Adjustable Micropower Low-Dropout Voltage Regulators
March 1994
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
m
A 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
current increases only slightly at dropout, which prolongs
battery life.
The LP2952 and LP2953 retain all the desirable characteris-
tics of the LP2951, but offer increased output current, addi-
tional 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
Y
Output voltage adjusts from 1.23V to 29V
Y
Guaranteed 250 mA output current
Y
Extremely low quiescent current
Y
Low dropout voltage
Y
Extremely tight line and load regulation
Y
Very low temperature coefficient
Y
Current and thermal limiting
Y
Reverse battery protection
Y
50 mA (typical) output pulldown crowbar
Y
5V and 3.3V versions available
LP2953 Versions Only
Y
Auxiliary comparator included with CMOS/TTL compati-
ble output levels. Can be used for fault detection, low
input line detection, etc.
Applications
Y
High-efficiency linear regulator
Y
Regulator with under-voltage shutdown
Y
Low dropout battery-powered regulator
Y
Snap-ON/Snap-OFF regulator
Block Diagrams
LP2952
LP2953
TL/H/11127±1
TL/H/11127±2
C
1995 National Semiconductor Corporation
TL/H/11127
RRD-B30M75/Printed in U. S. A.
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
b
65
§
C
s
T
A
s a
150
§
C
Operating Temperature Range
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3, LP2953I-3.3,
LP2952AI-3.3, LP2953AI-3.3
b
40
§
C
s
T
J
s a
125
§
C
LP2953AM
b
55
§
C
s
T
A
s a
125
§
C
Lead Temp. (Soldering, 5 seconds) 260
§
C
Power Dissipation (Note 2) Internally Limited
Input Supply Voltage
b
20V to
a
30V
Feedback Input Voltage (Note 3)
b
0.3V to
a
5V
Comparator Input Voltage (Note 4)
b
0.3V to
a
30V
Shutdown Input Voltage (Note 4)
b
0.3V to
a
30V
Comparator Output Voltage (Note 4)
b
0.3V to
a
30V
ESD Rating (Note 15)
2 kV
Maximum Junction Temperature
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3, LP2953I-3.3,
LP2952AI-3.3, LP2953AI-3.3
a
125
§
C
LP2953AM
a
150
§
C
Electrical Characteristics
Limits in standard typeface are for T
J
e
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
e
V
O
(NOM)
a
1V, I
L
e
1 mA, C
L
e
2.2
m
F for 5V parts and
4.7
m
F for 3.3V parts. Feedback pin is tied to V Tap pin, Output pin is tied to Output Sense pin.
3.3V Versions
LP2952AI-3.3, LP2953AI-3.3 LP2952I-3.3, LP2953I-3.3
Symbol Parameter
Conditions
Typical
Units
Min
Max
Min
Max
V
O
Output Voltage
3.3
3.284
3.317
3.267
3.333
3.260
3.340
3.234
3.366
V
1mA
s
I
L
s
250 mA 3.3
3.254
3.346
3.221
3.379
5V Versions
LP2952AI, LP2953AI,
LP2952I, LP2953I
Symbol Parameter
Conditions
Typical
LP2953AM (Note 17)
Min
Units
Max
Min
Max
V
O
Output Voltage
5.0
4.975
5.025
4.950
5.050
4.940 5.060 4.900 5.100
V
1mA
s
I
L
s
250 mA 5.0
4.930 5.070 4.880 5.120
All Voltage Options
LP2952AI, LP2953AI,
LP2952I, LP2953I,
LP2952AI-3.3, LP2953AI-3.3,
LP2952I-3.3, LP2953I-3.3
Symbol Parameter
Conditions Typical
Units
LP2953AM (Note 17)
Min
Max
Min
Max
D
V
O
D
T
Output Voltage (Note 5)
20
100
150 ppm/
§
C
Temp. Coefficient
D
V
O
V
O
Output Voltage V
IN
e
V
O
(NOM)
a
1V
0.03
0.1
0.2
%
Line Regulation
to 30V
0.2
0.4
D
V
O
V
O
Output Voltage I
L
e
1mAto250mA
0.04
0.16
0.20
%
Load Regulation I
L
e
0.1 mA to 1 mA
0.20
0.30
(Note 6)
V
IN
±V
O
Dropout Voltage I
L
e
1mA
60
100
100
(Note 7)
150
150
I
L
e
50 mA
240
300
300
420
420
mV
I
L
e
100 mA
400
400
310
520
520
I
L
e
250 mA
470
600
600
800
800
2
Electrical Characteristics
Limits in standard typeface are for T
J
e
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
e
V
O
(NOM)
a
1V, I
L
e
1 mA, C
L
e
2.2
m
F for 5V parts and
4.7
m
F for 3.3V parts. Feedback pin is tied to V Tap pin, Output pin is tied to Output Sense pin. (Continued)
All Voltage Options
(Continued)
LP2952AI, LP2953AI,
LP2952I, LP2953I,
LP2952AI-3.3, LP2953AI-3.3,
LP2952I-3.3, LP2953I-3.3
Symbol Parameter
Conditions
Typical
Units
LP2953AM (Note 17)
Min
Max
Min
Max
I
GND
Ground Pin Current I
L
e
1mA
130
170
170
m
A
(Note 8)
200
200
I
L
e
50 mA
1.1
2
2
2.5
2.5
I
L
e
100 mA
4.5
6
6
mA
8
8
I
L
e
250 mA
21
28
28
33
33
I
GND
Ground Pin Current V
IN
e
V
O
(NOM)
b
0.5V
165
210
210
m
A
at Dropout (Note 8) I
L
e
100
m
A
240
240
I
GND
Ground Pin Current (Note 9)
105
140
140
m
A
at Shutdown (Note 8)
I
LIMIT
Current Limit
V
OUT
e
0
380
500
500
mA
530
530
D
V
O
D
Pd
Thermal Regulation (Note 10)
0.05
0.2
0.2 %/W
e
n
Output Noise Voltage C
L
e
4.7
m
F
400
(10 Hz to 100 kHz)
C
L
e
33
m
F
260
m
V RMS
I
L
e
100 mA
C
L
e
33
m
F (Note 11)
80
V
REF
Reference Voltage (Note 12)
1.230
1.215
1.245
1.205
1.255
V
1.205
1.255
1.190 1.270
D
V
REF
V
REF
Reference Voltage V
IN
e
2.5V to V
O
(NOM)
a
1V
0.03
0.1
0.2
%
Line Regulation V
IN
e
V
O
(NOM)
a
1V to 30V
0.2
0.4
(Note 13)
D
V
REF
V
REF
Reference Voltage I
REF
e
0to200
m
A
0.25
0.4
0.8
%
Load Regulation
0.6
1.0
D
V
REF
D
T
Reference Voltage (Note 5)
20
ppm/
§
C
Temp. Coefficient
I
B
(FB) Feedback Pin
20
40
40
nA
Bias Current
60
60
I
O
Output ``OFF''
(Note 9)
50
30
30
mA
(SINK) Pulldown Current
20
20
3
Electrical Characteristics
Limits in standard typeface are for T
J
e
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
e
V
O
(NOM)
a
1V, I
L
e
1 mA, C
L
e
2.2
m
F for 5V parts and
4.7
m
F for 3.3V parts. Feedback pin is tied to V Tap pin, Output pin is tied to Output Sense pin. (Continued)
LP2952AI, LP2953AI,
LP2952I, LP2953I,
LP2952AI-3.3, LP2953AI-3.3,
Symbol
Parameter
Conditions
Typical
LP2952I-3.3, LP2953I-3.3
Units
LP2953AM (Note 17)
Min
Max
Min
Max
DROPOUT DETECTION COMPARATOR
I
OH
Output ``HIGH''
V
OH
e
30V
0.01
1
1
m
A
Leakage
2
2
V
OL
Output ``LOW''
V
IN
e
V
O
(NOM)
b
0.5V
150
250
250
mV
Voltage
I
O
(COMP)
e
400
m
A
400
400
V
THR
Upper Threshold
(Note 14)
b
80
b
35
b
80
b
35
b
60
mV
(MAX) Voltage
b
95
b
25
b
95
b
25
V
THR
Lower Threshold
(Note 14)
b
85
b
110
b
55
b
110
b
55
mV
(MIN) Voltage
b
160
b
40
b
160
b
40
HYST Hysteresis
(Note 14)
15
mV
SHUTDOWN INPUT
(Note 16)
V
OS
Input Offset Voltage (Referred to V
REF
)
b
7.5
7.5
b
7.5
7.5
g
3
mV
b
10
10
b
10
10
HYST Hysteresis
6
mV
I
B
Input Bias Current V
IN
(S/D)
e
0V to 5V
10
b
30
30
b
50
50
b
30
b
30
50
b
50
nA
LP2953AM
b
30
30
10
b
75
75
AUXILIARY COMPARATOR (LP2953 Only)
V
OS
Input Offset Voltage (Referred to V
REF
)
g
3
b
7.5
7.5
b
10
b
7.5
7.5
10
mV
b
10
10
b
7.5
LP2953AM
7.5
g
3
b
12
12
HYST Hysteresis
6
mV
I
B
Input Bias Current V
IN
(COMP)
e
0V to 5V
10
b
30
30
b
50
b
30
30
50
nA
b
50
50
b
30
LP2953AM
30
10
b
75
75
I
OH
Output ``HIGH''
V
OH
e
30V
0.01
1
Leakage
V
IN
(COMP)
e
1.3V
2
1
m
A
2
LP2953AM
1
2.2
0.01
V
OL
Output ``LOW''
V
IN
(COMP)
e
1.1V
150
250
250
Voltage
I
O
(COMP)
e
400
m
A
400
mV
400
LP2953AM
250
420
150
4
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(MAX), the junction-to-ambient thermal resistance,
i
J±A
,
and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated using: P (MAX)
e
TJ(MAX)
b
TA
i
J±A
.
Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. See APPLICATION
HINTS for additional information on heatsinking and thermal resistance.
Note 3: When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground.
Note 4: May exceed the input supply voltage.
Note 5: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 6: Load regulation is measured at constant junction temperature using low duty cycle pulse testing. Two separate tests are performed, one for the range of
100
m
A to 1 mA and one for the 1 mA to 250 mA range. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential. At
very low values of programmed output voltage, the input voltage minimum of 2V (2.3V over temperature) must be observed.
Note 8: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current, output load current, and
current through the external resistive divider (if used).
Note 9: V
SHUTDOWN
s
1.1V, V
OUT
e
V
O
(NOM).
Note 10: Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation effects. Specifications
are for a 200 mA load pulse at VIN
e
VO(NOM)
a
15V (3W pulse) for T
e
10 ms.
Note 11: Connect a 0.1
m
F capacitor from the output to the feedback pin.
Note 12: V
REF
s
V
OUT
s
(V
IN
b
1V), 2.3V
s
V
IN
s
30V, 100
m
A
s
I
L
s
250 mA.
Note 13: Two separate tests are performed, one covering 2.5V
s
V
IN
s
V
O
(NOM)
a
1V and the other test for V
O
(NOM)
a
1V
s
V
IN
s
30V.
Note 14: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at
V
IN
e
V
O
(NOM)
a
1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V
OUT
/V
REF
e
(R1
a
R2)/R2
(refer to Figure 4).
Note 15: Huma
n body mo
del, 200 pF discharged through 1.5 k
X
.
Note 16: Drive Shutdown pin with TTL or CMOS-low level to shut regulator OFF, high level to turn regulator ON.
Note 17: A military RETS specification is available upon request. At the time of printing, the LP2953AMJ/883C RETS specification complied with the boldface
limits in this column.
5
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