LP2950.PDF

March 1995

LP2950/A-XX and LP2951/A-XX Series

of Adjustable Micropower Voltage Regulators

General Description

The LP2950 and LP2951 are micropower voltage regulators

with very low quiescent current (75 m A typ.) and very low

dropout voltage (typ. 40 mV at light loads and 380 mV at

100 mA). They are ideally suited for use in battery-powered

systems. Furthermore, the quiescent current of the

LP2950/LP2951 increases only slightly in dropout, prolong-

ing battery life.

The LP2950-5.0 in the popular 3-pin TO-92 package is pin-

compatible with older 5V regulators. The 8-lead LP2951 is

available in plastic, ceramic dual-in-line, or metal can pack-

ages and offers additional system functions.

One such feature is an error flag output which warns of a

low output voltage, often due to falling batteries on the in-

put. It may be used for a power-on reset. A second feature

is the logic-compatible shutdown input which enables the

regulator to be switched on and off. Also, the part may be

pin-strapped for a 5V, 3V, or 3.3V output (depending on the

version), or programmed from 1.24V to 29V with an external

pair of resistors.

Careful design of the LP2950/LP2951 has minimized all

contributions to the error budget. This includes a tight initial

tolerance (.5% typ.), extremely good load and line regula-

tion (.05% typ.) and a very low output voltage temperature

coefficient, making the part useful as a low-power voltage

reference.

Features

Y 5V, 3V, and 3.3V versions available

Y High accuracy output voltage

Y Guaranteed 100 mA output current

Y Extremely low quiescent current

Y Low dropout voltage

Y Extremely tight load and line regulation

Y Very low temperature coefficient

Y Use as Regulator or Reference

Y Needs minimum capacitance for stability

Y Current and Thermal Limiting

LP2951versionsonly

Y Error flag warns of output dropout

Y Logic-controlled electronic shutdown

Y Output programmable from 1.24 to 29V

Block Diagram and Typical Applications

LP2950/A-XX

LP2951/A-XX

TL/H/8546±25

TL/H/8546±1

C 1995 National Semiconductor Corporation

TL/H/8546

RRD-B30M75/Printed in U. S. A.

Connection Diagrams

TO-92 Plastic Package (Z)

Dual-In-Line Packages (N, J)

Surface-Mount Package (M)

TL/H/8546±2

Bottom View

Order Number LP2950ACZ-3.0, LP2950CZ-3.0,

LP2950ACZ-3.3, LP2950CZ-3.3 LP2950ACZ-5.0

or LP2950CZ-5.0

See NS Package Number Z03A

TL/H/8546±26

Top View

Order Number LP2951CJ, LP2951ACJ, LP2951J,

LP2951J/883 or 5962-3870501MPA

See NS Package Number J08A

Order Number LP2951ACN, LP2951CN, LP2951ACN-3.0,

LP2951CN-3.0, LP2951ACN-3.3 or LP2951CN-3.3

See NS Package Number N08E

Order Number LP2951ACM, LP2951CM,

LP2951ACM-3.0, LP2951CM-3.0,

LP2951ACM-3.3 or LP2951CM-3.3

See NS Package Number M08A

Metal Can Package (H)

Leadless Chip Carrier (E)

TL/H/8546±24

TL/H/8546±19

Top View

Order Number LP2951E/883 or 5962-3870501M2A

See NS Package Number E20A

Top View

Order Number LP2951H/883 or

5962-3870501MGA

See NS Package Number H08C

Ordering Information

Package

Output Voltage

Temperature

( § C)

3.0V

3.3V

5.0V

TO-92 (Z) LP2950ACZ-3.0 LP2950ACZ-3.3 LP2950ACZ-5.0 b 40 k T J k 125

LP2950CA-3.0 LP2950CZ-3.3 LP2950CZ-5.0

N (N-08E) LP2951ACN-3.0 LP2951ACN-3.3 LP2951ACN

b 40 k T J k 125

LP2951CN-3.0 LP2951CN-3.3 LP2950CN

M (M08A) LP2951ACM-3.0 LP2951ACM-3.3 LP2951ACM

b 40 k T J k 125

LP2951CM-3.0 LP2951CM-3.3 LP2951CM

J (J08A)

LP2951ACJ

b 40 k T J k 125

LP2951CJ

LP2951J

b 55 k T J k 150

LP2951J/883

5926-3870501MPA

H (H08C)

LP2951H/883 b 55 k T J k 150

5962-3870501MGA

E (E20A)

LP2951E/883 b 55 k T J k 150

5962-3870501M2A

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Power Dissipation Internally Limited

Lead Temp. (Soldering, 5 seconds) 260 § C

Storage Temperature Range b 65 § to a 150 § C

Operating Junction Temperature Range (Note 8)

LP2951

Input Supply Voltage

b 0.3 to a 30V

Feedback Input Voltage

b 1.5 to a 30V

(Notes 9 and 10)

Shutdown Input Voltage

b 0.3 to a 30V

(Note 9)

Error Comparator Output

Voltage (Note 9)

b 0.3 to a 30V

b 55 § to a 150 § C

ESD Rating is to be determined.

LP2950AC-XX, LP2950C-XX,

LP2951AC-XX, LP2951C-XX

b 40 § to a 125 § C

Electrical Characteristics (Note 1)

LP2951

LP2950AC-XX

LP2950C-XX

LP2951AC-XX LP2951C-XX

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16)

Parameter

Conditions

(Note 2)

Units

(Note 3) (Note 4)

3V VERSIONS (Note 17)

Output Voltage

T J e 25 § C

3.0

3.015

3.0

3.015

3.0

3.030

V max

2.985

2.970

V min

b 25 § C s T J s 85 § C

3.0

3.030

3.0

3.045 V max

2.970

2.955 V min

Full Operating

3.0

3.036

3.0

3.036

3.0

3.060 V max

Temperature Range

2.964

2.940 V min

Output Voltage

100 m A s I L s 100 mA

3.0

3.045

3.0

3.042

3.0

3.072 V max

T J s T JMAX

2.955

2.958

2.928 V min

3.3V VERSIONS (Note 17)

Output Voltage

T J e 25 § C

3.3

3.317

3.3

3.317

3.3

3.333

V max

3.284

3.267

V min

b 25 § C s T J s 85 § C

3.3

3.333

3.3

3.350 V max

3.267

3.251 V min

Full Operating

3.3

3.340

3.3

3.340

3.3

3.366 V max

Temperature Range

3.260

3.234 V min

Output Voltage

100 m A s I L s 100 mA

3.3

3.350

3.3

3.346

3.3

3.379 V max

T J s T JMAX

3.251

3.254

3.221 V min

5V VERSIONS (Note 17)

Output Voltage

T J e 25 § C

5.0

5.025

5.0

5.025

5.0

5.05

V max

4.975

4.95

V min

b 25 § C s T J s 85 § C

5.0

5.05

5.0

5.075 V max

4.95

4.925 V min

Full Operating

5.0

5.06

5.0

5.06

5.0

5.1 V max

Temperature Range

4.94

4.9 V min

Output Voltage

100 m A s I L s 100 mA

5.0

5.075

5.0

5.075

5.0

5.12 V max

T J s T JMAX

4.925

4.88 V min

ALL VOLTAGE OPTIONS

Output Voltage

(Note 12)

20 120 20

100 50

150 ppm/ § C

Temperature Coefficient

Line Regulation

(V O NOM a 1)V s V in s 30V 0.03

0.1

0.03 0.1

0.04 0.2

% max

(Note 14)

(Note 15)

0.5

0.2

0.4 % max

Load Regulation

100 m A s I L s 100 mA

0.04

0.1

0.04 0.1

0.1 0.2

% max

(Note 14)

0.3

0.2

0.3 % max

Electrical Characteristics (Note 1) (Continued)

LP2951

LP2950AC-XX

LP2950C-XX

LP2951AC-XX LP2951C-XX

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16)

Parameter

Conditions

(Note 2)

Units

(Note 3) (Note 4)

ALL VOLTAGE OPTIONS (Continued)

Dropout Voltage

I L e 100 m A 50

50 80

50 80 ax

(Note 5)

150

150 mV max

I L e 100 mA

380

450

380 450

mV max

600

600 mV max

Ground

I L e 100 m A

120

75 120

m A max

Current

140

140 m A max

I L e 100 mA

mA max

14 mA max

Dropout

V in e (V O NOM b 0.5)V 110

170

110 170

m A max

Ground Current

I L e 100 m A

200

200 m A max

Current Limit

V out e 0

160

200

160 200

mA max

220

220 mA max

Thermal Regulation (Note 13)

0.05

0.2

0.05 0.2

%/W max

Output Noise,

C L e 1 m F (5V Only) 430

430

m V rms

10 Hz to 100 KHz

C L e 200 m F

160

m V rms

C L e 3.3 m F

(Bypass e 0.01 m F

100

m V rms

Pins 7 to 1 (LP2951))

8-PIN VERSIONS ONLY

LP2951

LP2951AC-XX

LP2951C-XX

Reference

1.235 1.25 1.235 1.25

1.235 1.26

V max

Voltage

1.26

1.27 V max

1.22

1.21

V min

1.2

1.2 V min

Reference

(Note 7)

1.27

1.285 V max

Voltage

1.19

1.185 V min

Feedback Pin

20 40

nA max

Bias Current

60 nA max

Reference Voltage

(Note 12)

ppm/ § C

Temperature Coefficient

Feedback Pin Bias

0.1

nA/ § C

Current Temperature

Coefficient

Error Comparator

Output Leakage

V OH e 30V

0.01

0.01 1

m A max

Current

2 m A max

Output Low

V in e (V O NOM b 0.5)V 150

250

150 250

mV max

Voltage

I OL e 400 m A

400

400 mV max

Upper Threshold

(Note 6)

60 40

mV min

Voltage

25 mV min

Lower Threshold

(Note 6)

75 95

mV max

Voltage

140

140 mV max

Hysteresis

(Note 6)

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