A4957 datasheet(3/16 Pages) ALLEGRO

Part #	A4957

Description	The A4957 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for applications with high-power inductive loads such as brush DC motors.

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Full Bridge MOSFET Driver

A4957

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Functional Block Diagram

Control

Logic

Diagnostics &

Protection

VBAT

CP1

CP2

BLO

GLA

GHA

SA

CA

Battery +

BHI

VDD

RGHA

RGLA

CBOOTA

CP

ALO

AHI

RDEAD

RESET

FAULT

Low

Side

GLB

GHB

SB

CB

RGHB

RGLB

CBOOTB

Bootstrap

Monitor

Low

Side

GND

Thermal Pad

High

Side

Bootstrap

Monitor

VBB

High

Side

CREG

Charge

Pump

Regulator

GND

VREG

AGND

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