Designed for pulse-width-modulated (PWM) control of DC

motors, the A89505 is capable of 50 V operation and provides

gate drive for an all N-channel external MOSFET bridge.

Input terminals are provided for use in controlling the speed and

direction of a DC motor with externally applied PWM control

signals. Internal synchronous rectification control circuitry is

provided to lower power dissipation during PWM operation.

Internal circuit protection includes VDS protection, thermal

shutdown with hysteresis, undervoltage monitoring of VBB,

and crossover-current protection.

TheA89505 is supplied in a low-profile 4 mm × 4 mm, 20-contact

QFN package (suffix “ES”) and a 20-lead eTSSOP (suffix

“LP”), both with exposed thermal pad.

A89505-DS, Rev. 4

MCO-0001098

• Standard IN1/IN2 control logic

• Overcurrent indication

• Adjustable off-time and blank-time

• Adjustable current limit

• Adjustable gate drive

• Synchronous rectification

• Internal UVLO

• Crossover-current protection

• MOSFET VDS protection

• Voltage output proportional to load current

• AEC-Q100 qualified

Full-Bridge PWM Gate Driver

PACKAGES:

Functional Block Diagram

Not to scale

A89505

CHARGE PUMP

VREG

UVLO

TSD

ISET

RC

SLEEPn

IN1

IN2

STANDBY

Control

Logic

VCP

GATE

DRIVE

VCP

VBB

GHA

GHB

SB

SA

OCLn

AIOUTHOLD

VREF

×10

÷10

OCL

Filter

+

–

GLA

GLB

SENSE

GND

System

Controller

optional

0.1 µF

0.1 µF

VIN

GHA

SA

GLA

R

SENSE

Inrush current limit =

V/10 * R

REF

SENSE

optional

reverse-battery protection

FEATURES AND BENEFITS

DESCRIPTION

20-Pin QFN (suffix “ES”)

with Exposed Thermal Pad

20-Pin eTSSOP (suffix “LP”)

with Exposed Thermal Pad

August 8, 2022