LP2950CZ 3.3 -NS.pdf

November 2004

LP2950/LP2951

Series of Adjustable Micropower Voltage Regulators

General Description

The LP2950 and LP2951 are micropower voltage regulators

with very low quiescent current (75µA typ.) and very low

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

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

systems. Furthermore, the quiescent current of the LP2950/

LP2951 increases only slightly in dropout, prolonging battery

life.

The LP2950-5.0 is available in the surface-mount D-Pak

package, and in the popular 3-pin TO-92 package for pin-

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

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

packages 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 input. 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 regulation

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

ficient, making the part useful as a low-power voltage refer-

ence.

Features

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

n High accuracy output voltage

n Guaranteed 100mA output current

n Extremely low quiescent current

n Low dropout voltage

n Extremely tight load and line regulation

n Very low temperature coefficient

n Use as Regulator or Reference

n Needs minimum capacitance for stability

n Current and Thermal Limiting

n Stable with low-ESR output capacitors (10m

Ω

to 6

Ω

)

LP2951 versions only

n Error flag warns of output dropout

n Logic-controlled electronic shutdown

n Output programmable from 1.24 to 29V

Block Diagram and Typical Applications

LP2950

LP2951

00854625

00854601

DS008546

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Connection Diagrams

TO-252 (D-Pak)

TO-92 Plastic Package (Z)

00854602

Bottom View

00854670

Dual-In-Line Packages (N, J)

Surface-Mount Package (M, MM)

Front View

8-Lead LLP

00854626

Top View

Metal Can Package (H)

00854671

Pin 4 is fused to center DAP

Top View

00854619

Top View

10-Lead Ceramic Surface-Mount Package (WG)

00854664

Top View

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Ordering Information

Package Temperature

Range

Part Number

Package Marking

Transport Media NSC Drawing

TO-92 (Z) −40 < T J < 125

LP2950ACZ-3.0

2950A CZ3.0

Bag

Z03A

LP2950CZ-3.0

2950 CZ3.0

Bag

LP2950ACZ-3.3

2950A CZ3.3

Bag

LP2950CZ-3.3

2950 CZ3.3

Bag

LP2950ACZ-5.0

2950A CZ5.0

Bag

LP2950CZ-5.0

2950 CZ5.0

Bag

TO-252

(D-Pak)

−40 < T J < 125

LP2950CDT-3.0

75 Units/Rail

TD03B

LP2950CDTX-3.0

2.5k Units Tape and Reel

LP2950CDT-3.3

75 Units/Rail

LP2950CDTX-3.3

2.5k Units Tape and Reel

LP2950CDT-5.0

75 Units/Rail

LP2950CDTX-5.0

2.5k Units Tape and Reel

N (N-08E) −40 < T J < 125

LP2951ACN-3.0

40 Units/Rail

N08E

LP2951CN-3.0

40 Units/Rail

LP2951ACN-3.3

40 Units/Rail

LP2951CN-3.3

40 Units/Rail

LP2951ACN

40 Units/Rail

LP2951CN

40 Units/Rail

M (M08A) −40 < T J < 125

LP2951ACM-3.0

2951ACM30*

(where * is die rev letter)

95 Units/Rail

M08A

LP2951ACMX-3.0

2.5k Units Tape and Reel

LP2951CM-3.0

2951CM30*

(where * is die rev letter)

95 Units/Rail

LP2951CMX-3.0

2.5k Units Tape and Reel

LP2951ACM-3.3

2951ACM33*

(where * is die rev letter)

95 Units/Rail

LP2951ACMX-3.3

2.5k Units Tape and Reel

LP2951CM-3.3

2951CM33*

(where * is die rev letter)

95 Units/Rail

LP2951CMX-3.3

2.5k Units Tape and Reel

LP2951ACM

2951ACM*

(where * is die rev letter)

95 Units/Rail

LP2951ACMX

2.5k Units Tape and Reel

LP2951CM

2951CM*

(where * is die rev letter)

95 Units/Rail

LP2951CMX

2.5k Units Tape and Reel

(MUA08A)

−40 < T J < 125 LP2951ACMM-3.0

L0BA

1k Units Tape and Reel

MUA08A

LP2951ACMMX-3.0

3.5k Units Tape and Reel

LP2951CMM-3.0

L0BB

1k Units Tape and Reel

LP2951CMMX-3.0

3.5k Units Tape and Reel

LP2951ACMM-3.3

L0CA

1k Units Tape and Reel

LP2951ACMMX-3.3

3.5k Units Tape and Reel

LP2951CMM-3.3

L0CB

1k Units Tape and Reel

LP2951CMMX-3.3

3.5k Units Tape and Reel

LP2951ACMM

L0DA

1k Units Tape and Reel

LP2951ACMMX

3.5k Units Tape and Reel

LP2951CMM

L0DB

1k Units Tape and Reel

LP2951CMMX

3.5k Units Tape and Reel

J (J08A)

−55 < T J < 150

LP2951J/883

See MIL/AERO Datasheet

40 Units/Rail

J08A

H (H08C) −55 < T J < 150

LP2951H/883

See MIL/AERO Datasheet

Tray

H08C

(WG10A)

−55 < T J < 150

LP2951WG/883

See MIL/AERO Datasheet

Tray

WG10A

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Ordering Information (Continued)

Package Temperature

Range

Part Number

Package Marking

Transport Media NSC Drawing

8-lead

LLP

−40 < T J < 125

LP2951ACSD-3.0

51AC30

1k Units Tape and Reel

SDC08A

LP2951ACSDX-3.0

4.5k Units Tape and Reel

LP2951CSD-3.0

51AC30B

1k Units Tape and Reel

LP2951CSDX-3.0

4.5k Units Tape and Reel

LP2951ACSD-3.3

51AC33

1k Units Tape and Reel

LP2951ACSDX-3.3

4.5k Units Tape and Reel

LP2951CSD-3.3

51AC33B

1k Units Tape and Reel

LP2951CSDX-3.3

4.5k Units Tape and Reel

LP2951ACSD

2951AC

1k Units Tape and Reel

LP2951ACSDX

4.5k Units Tape and Reel

LP2951CSD

2951ACB

1k Units Tape and Reel

LP2951CSDX

4.5k Units Tape and Reel

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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.

Input Supply Voltage

ESD Rating

Human Body Mode l(Note 18)

2500V

Operating Ratings (Note 1)

−0.3 to +30V

Maximum Input Supply Voltage

30V

SHUTDOWN Input Voltage,

Error Comparator Output

Voltage, (Note 9)

FEEDBACK Input Voltage

−1.5 to +30V

Junction Temperature Range

(T J ) (Note 8)

LP2951

−55˚ to +150˚C

(Note 9) (Note 10)

Power Dissipation

Internally Limited

LP2950AC-XX, LP2950C-XX,

LP2951AC-XX, LP2951C-XX

−40˚ to +125˚C

Junction Temperature (T J )

+150˚C

Ambient Storage Temperature

−65˚ to +150˚C

Soldering Dwell Time, Temperature

Wave

Infrared

Vapor Phase

4 seconds, 260˚C

10 seconds, 240˚C

75 seconds, 219˚C

Electrical Characteristics (Note 2)

LP2951

LP2950AC-XX

LP2950C-XX

Parameter

Conditions

(Note 2)

LP2951AC-XX LP2951C-XX

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16)

Units

(Note 3) (Note 4)

3V Versions (Note 17)

Output Voltage

T J = 25˚C

3.0

3.015

3.0

3.015

3.0

3.030

V max

2.985

2.970

V min

−25˚C ≤ T J ≤ 85˚C 3.0

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

100µA

≤

I L ≤

3.0

3.045

3.0

3.042

3.0

3.072 V max

100mA

T J ≤ T JMAX

2.955

2.958

2.928 V min

3.3V Versions (Note 17)

Output Voltage

T J = 25˚C

3.3

3.317

3.3

3.317

3.3

3.333

V max

3.284

3.267

V min

−25˚C

≤

T J ≤

85˚C 3.3

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

100µA

≤

I L

≤

3.3

3.350

3.3

3.346

3.3

3.379 V max

100mA

T J ≤

T JMAX

3.251

3.254

3.221 V min

5V Versions (Note 17)

Output Voltage

T J = 25˚C

5.0

5.025

5.0

5.025

5.0

5.05

V max

4.975

4.95

V min

−25˚C ≤ T J ≤ 85˚C 5.0

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

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