LP2952-N, LP2952A, LP2953, LP2953A

SNVS095F – MAY 2004 – REVISED MARCH 2015

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7 Detailed Description

7.1 Overview

The LP2952 and LP2953 are very high accuracy micropower voltage regulators with low quiescent current (130

μA, typical) and low dropout voltage (typically 60 mV at light loads and 490 mV at 250 mA). They are ideally

suited for use in battery-powered systems.

The LP2952 and LP2953 block diagram contains several features, including:

•

Very high accuracy 1.23-V reference.

•

Internal protection circuitry, such as thermal foldback current limit, thermal shutdown protection, and reverse

battery-input protection.

•

Fixed 5-V and 3.3-V versions.

•

Error flag output which may be used for a power-on reset.

•

Shutdown input, allowing turn off the regulator when the SHUTDOWN pin is pulled low.

LP2953 versions only:

•

An auxiliary comparator is designed for customer special purpose when shutdown is activated, this is a

CMOS- or TTL-compatible output level.

•

Automatic output discharge when the SHUTDOWN pin is pulled low.

7.2 Functional Block Diagrams

Figure 28. LP2952 Block Diagram

14

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Product Folder Links: LP2952-N LP2952A LP2953 LP2953A