A4957 Datasheet, PDF (14/16 Pages) Allegro MicroSystems – 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.

A4957
Full Bridge MOSFET Driver
Pin-out Diagram
SA 1
GLA 2
VBB 3
CP2 4
CP1 5
GND 6
PAD
18 GLB
17 GND
16 RESET
15 FAULT
14 RDEAD
13 AGND
Terminal List
Number
Name
1
SA
2
GLA
3
VBB
4
5
6,7,17
8
9
10
11
12
13
14
15
16
18
19
20
21
22
23
24
–
CP2
CP1
GND
BLO
BHI
ALO
AHI
VDD
AGND
RDEAD
FAULT
RESET
GLB
SB
GHB
CB
VREG
CA
GHA
PAD
Function
Load Connection A
Low-side Gate Drive A
Main Supply
Pump Capacitor
Pump Capacitor
Ground
Control Input B Low Side
Control Input B High Side
Control Input A Low Side
Control Input A High Side
Logic Supply
Ground Reference
Dead time setting input
Fault Output
Reset Input
Low-side Gate Drive B
Load Connection B
High-side Gate Drive B
Bootstrap Capacitor B
Regulated 13 V
Bootstrap Capacitor A
High-side Gate Drive A
Exposed pad for thermal dissipation, connect to GND
Allegro MicroSystems, Inc.
14
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com