National Semiconductor LP2952, LP2952A, LP2953, LP2953A Technical data
March 2005
LP2952/LP2952A/LP2953/LP2953A
Adjustable Micropower Low-Dropout Voltage Regulators
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 current increases only slightly at dropout, which prolongs battery life.
The LP2952 and LP2953 retain all the desirable characteristics 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.
Block Diagrams
Features
n Output voltage adjusts from 1.23V to 29V
n Guaranteed 250 mA output current
n Extremely low quiescent current
n Low dropout voltage
n Extremely tight line and load regulation
n Very low temperature coefficient
n Current and thermal limiting
n Reverse battery protection
n 50 mA (typical) output pulldown crowbar
n 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 High-efficiency linear regulator
n Regulator with under-voltage shutdown
n Low dropout battery-powered regulator
n Snap-ON/Snap-OFF regulator
LP2952
LP2953
01112702
01112701
© 2005 National Semiconductor Corporation DS011127 www.national.com
Pinout Drawings
LP2952
14-Pin DIP
LP2952/LP2952A/LP2953/LP2953A
LP2953
16-Pin DIP
LP2952
16-Pin SO
01112711
01112713
Ordering Information
LP2952
Order
Number
LP2952IN,
LP2952AIN,
LP2952IN-3.3,
LP2952AIN-3.3
LP2952IM,
LP2952AIM,
LP2952IM-3.3,
LP2952AIM-3.3
Order
Number
LP2953IN,
LP2953AIN,
LP2953IN-3.3,
LP2953AIN-3.3
LP2953IM,
LP2953AIM,
LP2953IM-3.3,
LP2953AIM-3.3
LP2953AMJ/883
5962-9233601MEA
LP2953AMJ-QMLV
5962-9233601VEA
LP2953AMWG/883
5962-9233601QXA
LP2953AMWG-QMLV
5962-9233601VXA
Temp.
Range
)˚C
(T
J
−40 to
+125
−40 to
+125
LP2953
Temp.
Range
)˚C
(T
J
−40 to
+125
−40 to
+125
−55 to
+150
−55 to
+150
Package NSC
Drawing
Number
14-Pin
Molded
DIP
16-Pin
Surface
Mount
Package NSC
Drawing
Number
16-Pin
Molded DIP
16-Pin
Surface
Mount
16-Pin
Ceramic DIP
16-Pin
Ceramic
Surface
WG16A
Mount
N14A
M16A
N16A
M16A
J16A
01112712
LP2953
16-Pin SO
01112714
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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 −65˚C ≤ T
Operating Temperature Range
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3 −40˚C ≤ T
LP2953AM −55˚C ≤ T
+150˚C
≤ +125˚C
J
+125˚C
A
A
≤
≤
Maximum Junction Temperature
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3 +125˚C
LP2953AM +150˚C
Input Supply Voltage −20V to +30V
Feedback Input Voltage (Note 3) −0.3V to +5V
Comparator Input Voltage (Note 4) −0.3V to +30V
Shutdown Input Voltage (Note 4) −0.3V to +30V
Comparator Output Voltage (Note
4) −0.3V to +30V
ESD Rating (Note 15) 2 kV
Lead Temp. (Soldering, 5 seconds) 260˚C
Power Dissipation (Note 2) Internally Limited
Electrical Characteristics Limits in standard typeface are for T
= 25˚C, bold typeface applies over the full
J
operating temperature range. Limits are guaranteed by production testing or correlation techniques using standard Statistical
Quality Control (SQC) methods. Unless otherwise specified: V
(NOM) + 1V, IL= 1 mA, CL= 2.2 µF for 5V parts and
IN=VO
4.7µF for 3.3V parts. Feedback pin is tied to V Tap pin, Output pin is tied to Output Sense pin.
3.3V Versions
Symbol Parameter Conditions Typical LP2952AI-3.3, LP2953AI-3.3 LP2952I-3.3, LP2953I-3.3 Units
Min Max Min Max
V
O
Output Voltage 3.3 3.284 3.317 3.267 3.333 V
3.260 3.340 3.234 3.366
1mA≤ I
≤ 250 mA 3.3 3.254 3.346 3.221 3.379
L
5V Versions
Symbol Parameter Conditions Typical LP2952AI, LP2953AI, LP2952I, LP2953I Units
LP2953AM (Note 17)
Min Max Min Max
V
O
Output Voltage 5.0 4.975 5.025 4.950 5.050 V
4.940 5.060 4.900 5.100
1mA≤ I
≤ 250 mA 5.0 4.930 5.070 4.880 5.120
L
All Voltage Options
Electrical Characteristics
Limits in standard typeface are for TJ= 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
Tap pin, Output pin is tied to Output Sense pin.
Symbol Parameter Conditions Typical LP2952AI, LP2953AI,
REGULATOR
Output Voltage Temp.
Coefficient
(NOM) + 1V, IL= 1 mA, CL= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
IN=VO
LP2952I, LP2953I,
LP2952AI-3.3,
LP2953AI-3.3,
LP2952I-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min Max Min Max
(Note 5) 20 100 150 ppm/˚C
Units
Output Voltage Line
Regulation
VIN=VO(NOM) + 1V to 30V 0.03 0.1 0.2 %
0.2 0.4
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All Voltage Options (Continued)
Electrical Characteristics (Continued)
Limits in standard typeface are for TJ= 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
Tap pin, Output pin is tied to Output Sense pin.
Symbol Parameter Conditions Typical LP2952AI, LP2953AI,
LP2952/LP2952A/LP2953/LP2953A
Output Voltage Load
Regulation (Note 6)
V
IN–VO
Dropout Voltage
(Note 7)
I
GND
Ground Pin Current
(Note 8)
I
GND
Ground Pin Current at
Dropout
I
GND
Ground Pin Current at
Shutdown (Note 8)
I
LIMIT
Current Limit V
Thermal Regulation (Note 10) 0.05 0.2 0.2 %/W
(NOM) + 1V, IL= 1 mA, CL= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
IN=VO
LP2952I, LP2953I,
LP2952AI-3.3,
LP2953AI-3.3,
LP2952I-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min Max Min Max
IL= 1 mA to 250 mA 0.04 0.16 0.20 %
= 0.1 mA to 1 mA 0.20 0.30
I
L
IL= 1 mA 60 100 100 mV
150 150
I
= 50 mA 240 300 300
L
420 420
I
= 100 mA 310 400 400
L
520 520
I
= 250 mA 470 600 600
L
800 800
IL= 1 mA 130 170 170 µA
200 200
I
= 50 mA 1.1 2 2 mA
L
2.5 2.5
I
= 100 mA 4.5 6 6
L
88
I
= 250 mA 21 28 28
L
33 33
VIN=VO(NOM) −0.5V 165 210 210 µA
I
= 100 µA 240 240
L
V
SHUTDOWN
OUT
≤ 1.1V 105 140 140 µA
= 0 380 500 500 mA
530 530
Units
e
n
V
REF
Output Noise Voltage
(10 Hz to 100 kHz)
= 100 mA
I
L
= 4.7 µF 400 µV
C
L
=33µF 260
C
L
C
= 33 µF (Note 11) 80
L
Reference Voltage (Note 12) 1.230 1.215 1.245 1.205 1.255 V
Reference Voltage Line
Regulation
VIN= 2.5V to VO(NOM) + 1V 0.03 0.1 0.2 %
V
(NOM) + 1V to 30V
IN=VO
(Note 13)
Reference Voltage Load
I
= 0 to 200 µA 0.25 0.4 0.8 %
REF
Regulation
Reference Voltage
(Note 5) 20 ppm/˚C
Temp. Coefficient
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RMS
1.205 1.255 1.190 1.270
0.2 0.4
0.6 1.0
All Voltage Options (Continued)
Electrical Characteristics (Continued)
Limits in standard typeface are for TJ= 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
Tap pin, Output pin is tied to Output Sense pin.
Symbol Parameter Conditions Typical LP2952AI, LP2953AI,
(FB) Feedback Pin Bias
I
B
Current
I
(SINK) Output “OFF” Pulldown
O
Current
DROPOUT DETECTION COMPARATOR
I
OH
V
OL
V
THR
(MAX)
V
THR
(MIN)
Output “HIGH” Leakage VOH= 30V 0.01 1 1 µA
Output “LOW” Voltage VIN=VO(NOM) − 0.5V
Upper Threshold
Voltage
Lower Threshold
Voltage
HYST Hysteresis (Note 14) 15 mV
SHUTDOWN INPUT (Note 15)
V
OS
Input Offset (Referred to V
Voltage −10 10 −10 10
HYST Hysteresis 6 mV
I
B
Input Bias VIN(S/D) = 0V to 5V 10 −30 30 −30
Current −50 50
AUXILIARY COMPARATOR (LP2953 Only)
V
OS
Input Offset Voltage (Referred to V
HYST Hysteresis 6 mV
I
B
I
OH
V
OL
Input Bias Current VIN(COMP) = 0V to 5V 10 −30 30 −30
Output “HIGH” Leakage VOH= 30V 0.01 1 1
Output “LOW” Voltage VIN(COMP) = 1.1V 150 250 250
(NOM) + 1V, IL= 1 mA, CL= 2.2 µF for 5V parts and 4.7µF for 3.3V parts. Feedback pin is tied to V
IN=VO
LP2952I, LP2953I,
LP2952AI-3.3,
LP2953AI-3.3,
LP2952I-3.3,
LP2953I-3.3
LP2953AM
(Notes 16, 17)
Min Max Min Max
20 40 40 nA
60 60
(Note 9) 30 30 mA
20 20
22
150 250 250 mV
(COMP) = 400 µA
I
O
400 400
(Note 14) −60 −80 −35 −80 −35 mV
−95 −25 −95 −25
(Note 14) −85 −110 −55 −110 −55 mV
−160 −40 −160 −40
REF
)
±
3 −7.5 7.5 −7.5 7.5 mV
−50
LP2953AM 10 −30 30
−75 75
REF
)
LP2953AM
±
3 −7.5 7.5 −7.5
−10 10
±
3 −7.5 7.5
−10
−12 12
−50 50
−50
LP2953AM 10 −30 30
−75 75
V
(COMP) = 1.3V 2
IN
LP2953AM 0.01 1
2.2
I
(COMP) = 400 µA 400
O
LP2953AM 150 250
420
−30
50
7.5
10
30
50
2
400
Units
nA
mV
nA
µA
mV
LP2952/LP2952A/LP2953/LP2953A
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All Voltage Options (Continued)
Electrical Characteristics (Continued)
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
and the ambient temperature, T
.
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.
LP2952/LP2952A/LP2953/LP2953A
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 µA 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).
≤ V
≤ 1.1V, V
OUT
Note 9: V
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 V
Note 11: Connect a 0.1 µF capacitor from the output to the feedback pin.
Note 12: V
Note 13: Two separate tests are performed, one covering 2.5V ≤ V
Note 14: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured atV
V
Figure 4).
Note 15: Human body model, 200 pF discharged through 1.5 kΩ.
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. For more information on military products, please refer to the Mil-Aero web page at
http://www.national.com/appinfo/milaero/index.html.
SHUTDOWN
REF
(NOM) + 1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V
O
. The maximum allowable power dissipation at any ambient temperature is calculated using the equation for P(MAX),
A
(NOM).
OUT=VO
(NOM)+15V (3W pulse) for T = 10 ms.
IN=VO
≤ (VIN− 1V), 2.3V ≤ VIN≤ 30V, 100 µA ≤ IL≤ 250 mA.
≤ VO(NOM)+1V and the other test for VO(NOM)+1V ≤ VIN≤ 30V.
IN
(MAX), the junction-to-ambient thermal resistance, θ
J
OUT/VREF
= (R1 + R2)/R2(refer to
J–A
IN
,
=
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Typical Performance Characteristics
Unless otherwise specified: VIN= 6V, IL= 1 mA, CL= 2.2
µF, V
= 3V, TA= 25˚C, V
SD
Quiescent Current Quiescent Current
OUT
= 5V.
LP2952/LP2952A/LP2953/LP2953A
01112727
Ground Pin Current vs Load Ground Pin Current
01112729
Ground Pin Current Output Noise Voltage
01112728
01112730
01112731
01112732
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