NSC LP2952AIM-3.3, LP2952AIM, LP2952IMX-3.3, LP2952IM-3.3, LP2952IM Datasheet

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(130µA 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.

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

Block Diagrams

LP2952

DS011127-1

LP2953

DS011127-2

May 1999

LP2952/LP2952A/LP2953/LP2953A Adjustable Micropower Low-Dropout Voltage Regulators

© 1999 National Semiconductor Corporation DS011127 www.national.com

Pinout Drawings

Ordering Information
LP2952

Order

Number

Temp.
Range
(T

J

)˚C

Package NSC

Drawing
Number

LP2952IN,
LP2952AIN,
LP2952IN-3.3,
LP2952AIN-3.3

−40 to
+125

14-Pin

Molded

DIP

N14A

LP2952IM,
LP2952AIM,
LP2952IM-3.3,
LP2952AIM-3.3

−40 to
+125

16-Pin

Surface

Mount

M16A

LP2953

Order

Number

Temp.
Range
(T

J

)˚C

Package NSC

Drawing

Number

LP2953IN,
LP2953AIN,
LP2953IN-3.3,
LP2953AIN-3.3

−40 to
+125

16-Pin

Molded DIP

N16A

LP2953IM,
LP2953AIM,
LP2953IM-3.3,
LP2953AIM-3.3

−40 to
+125

16-Pin

Surface

Mount

M16A

LP2953AMJ/883
5962-9233601MEA
LP2953AMJ-QMLV
5962-9233601VEA

−55 to
+150

16-Pin

Ceramic

DIP

J16A

LP2953AMWG/883
5962-9233601QXA
LP2953AMWG-QMLV
5962-9233601VXA

−55 to
+150

16-Pin

Ceramic

Surface

Mount

WG16A

LP2952

14-Pin DIP

DS011127-11

LP2953

16-Pin DIP

DS011127-13

LP2952

16-Pin SO

DS011127-12

LP2953

16-Pin SO

DS011127-14

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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

A

≤ +150˚C

Operating Temperature Range

LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3 −40˚C ≤ T

J

≤ +125˚C

LP2953AM −55˚C ≤ T

A

≤ +125˚C
Lead Temp. (Soldering, 5 seconds) 260˚C
Power Dissipation (Note 2) Internally Limited

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

Electrical Characteristics 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.

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

L

≤250 mA 3.3 3.254 3.346 3.221 3.379

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

L

≤250 mA 5.0 4.930 5.070 4.880 5.120

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 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.

Symbol Parameter Conditions Typical LP2952AI,

LP2953AI,
LP2952AI-3.3,
LP2953AI-3.3,

LP2953AM

(Notes 16, 17)

LP2952I, LP2953I,

LP2952I-3.3,

LP2953I-3.3

Units

Min Max Min Max

REGULATOR

Output Voltage Temp.
Coefficient

(Note 5) 20 100 150 ppm/˚C

Output Voltage Line
Regulation

V

IN

=

V

O

(NOM) + 1V to 30V 0.03 0.1 0.2

%

0.2 0.4

Output Voltage Load
Regulation (Note 6)

I

L

=

1 mA to 250 mA 0.04 0.16 0.20

%

I

L

=

0.1 mA to 1 mA 0.20 0.30

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Electrical Characteristics (Continued)

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.

Symbol Parameter Conditions Typical LP2952AI,

LP2953AI,
LP2952AI-3.3,
LP2953AI-3.3,

LP2953AM

(Notes 16, 17)

LP2952I, LP2953I,

LP2952I-3.3,

LP2953I-3.3

Units

Min Max Min Max

REGULATOR

V

IN–VO

Dropout Voltage
(Note 7)

I

L

=

1 mA 60 100 100 mV

150 150

I

L

=

50 mA 240 300 300

420 420

I

L

=

100 mA 310 400 400

520 520

I

L

=

250 mA 470 600 600

800 800

I

GND

Ground Pin Current
(Note 8)

I

L

=

1 mA 130 170 170 µA

200 200

I

L

=

50 mA 1.1 2 2 mA

2.5 2.5

I

L

=

100 mA 4.5 6 6

88

I

L

=

250 mA 21 28 28

33 33

I

GND

Ground Pin Current at
Dropout

V

IN

=

V

O

(NOM) −0.5V 165 210 210 µA

I

L

=

100 µA 240 240

I

GND

Ground Pin Current at
Shutdown (Note 8)

V

SHUTDOWN

≤ 1.1V 105 140 140 µA

I

LIMIT

Current Limit V

OUT

=

0 380 500 500 mA

530 530

Thermal Regulation (Note 10) 0.05 0.2 0.2

%

/W

e

n

Output Noise Voltage
(10 Hz to 100 kHz)
I

L

=

100 mA

C

L

=

4.7 µF 400 µV
RMS

C

L

=

33 µF 260

C

L

=

33 µF (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

Reference Voltage
Line Regulation

V

IN

=

2.5V to V

O

(NOM) + 1V 0.03 0.1 0.2

%

V

IN

=

V

O

(NOM) + 1V to 30V

(Note 13)

0.2 0.4

Reference Voltage
Load Regulation

I

REF

=

0 to 200 µA 0.25 0.4 0.8

%

0.6 1.0

Reference Voltage
Temp. Coefficient

(Note 5) 20 ppm/˚C

I

B

(FB) Feedback Pin Bias

Current

20 40 40 nA

60 60

I

O

(SINK) Output “OFF” Pulldown

Current

(Note 9) 30 30 mA

20 20

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Electrical Characteristics (Continued)

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.

Symbol Parameter Conditions Typical LP2952AI,

LP2953AI,
LP2952AI-3.3,
LP2953AI-3.3,

LP2953AM

(Notes 16, 17)

LP2952I, LP2953I,

LP2952I-3.3,

LP2953I-3.3

Units

Min Max Min Max

DROPOUT DETECTION COMPARATOR

I

OH

Output “HIGH”
Leakage

V

OH

=

30V 0.01 1 1 µA

22

V

OL

Output “LOW” Voltage V

IN

=

V

O

(NOM) − 0.5V

I

O

(COMP)=400 µA

150 250 250 mV

400 400

V

THR

(MAX)

Upper Threshold
Voltage

(Note 14) −60 −80 −35 −80 −35 mV

−95 −25 −95 −25

V

THR

(MIN)

Lower Threshold
Voltage

(Note 14) −85 −110 −55 −110 −55 mV

−160 −40 −160 −40

HYST Hysteresis (Note 14) 15 mV
SHUTDOWN INPUT (Note 15)
V

OS

Input Offset (Referred to V

REF

)

±

3 −7.5 7.5 −7.5 7.5 mV

Voltage −10 10 −10 10
HYST Hysteresis 6 mV
I

B

Input Bias VIN(S/D)=0V to 5V 10 −30 30 −30

−50

−30

50

nA

Current −50 50

LP2953AM 10 −30 30

−75 75

AUXILIARY COMPARATOR (LP2953 Only)

V

OS

Input Offset Voltage (Referred to V

REF

)

±

3 −7.5 7.5 −7.5

−10

7.5

10

mV

−10 10

LP2953AM

±

3 −7.5 7.5

−12 12

HYST Hysteresis 6 mV
I

B

Input Bias Current VIN(COMP)=0V to 5V 10 −30 30 −30

−50

30

50

nA

−50 50

LP2953AM 10 −30 30

−75 75

I

OH

Output “HIGH”

Leakage

V

OH

=

30V 0.01 1 1

2

µA

V

IN

(COMP)=1.3V 2

LP2953AM 0.01 1

2.2

V

OL

Output “LOW” Voltage VIN(COMP)=1.1V 150 250 250

400

mV

I

O

(COMP)=400 µA 400

LP2953AM 150 250

420

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur.Electrical specifications do not apply when operating the de-

vice 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, θ

J–A

,

and the ambient temperature, T

A

. The maximum allowable power dissipation at any ambient temperature is calculated using the equation for P(MAX),

.

www.national.com5

Electrical Characteristics (Continued)

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

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).
Note 9: V

SHUTDOWN

≤ 1.1V, V

OUT

=

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 V

IN

=

V

O

(NOM)+15V (3W pulse) for T=10 ms.

Note 11: Connect a 0.1 µF capacitor from the output to the feedback pin.
Note 12: V

REF

≤ V

OUT

≤ (VIN− 1V), 2.3V ≤ VIN≤ 30V, 100 µA ≤ IL≤ 250 mA.

Note 13: Two separate tests are performed, one covering 2.5V ≤ V

IN

≤ VO(NOM)+1V and the other test for VO(NOM)+1V ≤ VIN≤ 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

=

V

O

(NOM) + 1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V

OUT/VREF

=

(R1 + R2)/R2

(refer to

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.

Typical Performance Characteristics Unless otherwise specified: V

IN

=

6V, I

L

=

1 mA, C

L

=

2.2 µF,

V

SD

=

3V, T

A

=

25˚C, V

OUT

=

5V.

Quiescent Current

DS011127-27

Quiescent Current

DS011127-28

Ground Pin Current vs Load

DS011127-29

Ground Pin Current

DS011127-30

Ground Pin Current

DS011127-31

Output Noise Voltage

DS011127-32

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