LP2951CMM-3.3 National Semiconductor, LP2951CMM-3.3 Datasheet

LP2951CMM-3.3

Manufacturer Part Number

LP2951CMM-3.3

Description

Manufacturer

National Semiconductor

Datasheets

1.LP2951CMMX-3.0.pdf (26 pages)

2.LP2951ACMM.pdf (22 pages)

Specifications of LP2951CMM-3.3

Case

MSOP8

Date_code

06+

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LP2950/LP2951

Series of Adjustable Micropower Voltage Regulators

General Description

The LP2950 and LP2951 are micropower voltage regulators

with very low quiescent current (75 µA 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, 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, 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 re-

sistors.

Careful design of the LP2950/LP2951 has minimized all con-

tributions to the error budget. This includes a tight initial tol-

erance (.5% typ.), extremely good load and line regulation

Block Diagram and Typical Applications

LP2950

DS008546

DS008546-25

(.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 100 mA 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

LP2951 versions only

n Error flag warns of output dropout

n Logic-controlled electronic shutdown

n Output programmable from 1.24 to 29V

LP2951

January 2000

www.national.com

DS008546-1

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