Datasheet > A3921

A3921

更新时间： 2024-09-17 12:24:03

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
21页	401K
描述
Automotive Full Bridge MOSFET Driver

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A3921 数据手册

A3921

Automotive Full Bridge MOSFET Driver

Features and Benefits

Description

▪ High current gate drive for N-channel MOSFET full bridge

▪ High-side or low-side PWM switching

▪ Charge pump for low supply voltage operation

▪ Top-off charge pump for 100% PWM

▪ Cross-conduction protection with adjustable dead time

▪ 5.5 to 50 V supply voltage range

The A3921 is a full-bridge controller for use with external

N-channel power MOSFETs and is specifically designed for

automotiveapplicationswithhigh-powerinductiveloads,such

as brush DC motors.

A unique charge pump regulator provides full (>10 V) gate

drive for battery voltages down to 7 V and allows the A3921

to operate with a reduced gate drive, down to 5.5 V.

▪ Integrated 5 V regulator

▪ Diagnostics output

▪ Low current sleep mode

A bootstrap capacitor is used to provide the above-battery

supply voltage required for N-channel MOSFETs.An internal

charge pump for the high-side drive allows DC (100% duty

cycle) operation.

Package: 28-pin TSSOP with exposed

thermal pad (suffix LP)

The full bridge can be driven in fast or slow decay modes using

diode or synchronous rectification. In the slow decay mode,

current recirculation can be through the high-side or the low-

side FETs. The power FETs are protected from shoot-through

by resistor adjustable dead time.

Integrated diagnostics provide indication of undervoltage,

overtemperature, and power bridge faults, and can be

configured to protect the power MOSFETs under most short

circuit conditions.

TheA3921 is supplied in a 28-pin TSSOPpower package with

an exposed thermal pad (suffix LP). This package is lead (Pb)

free, with 100% matte-tin leadframe plating.

Not to scale

Typical Application

VBAT

PWM

A3921

Direction

Fault Flags

3921-DS

12 3 4 5 6 7...21

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