Data Sheet

Single Phase Full-wave Motor Driver for Silent Fan Motor

AM9789

Oct. 2012

Rev. 1. 1

BCD Semiconductor Manufacturing Limited

1

General Description

The AM9789 is a single-phase, full wave motor

driver suited for DC fan motor, and its speed is

controlled by PWM input signal. It is suitable for

both game machine and CPU cooler which need

silent drivers. It features lock protection, thermal

shutdown, PWM control, low noise and so on.

The AM9789 is available in MSOP-8, MSOP-10

DFN-3×3-8 and DFN-3×3-10 packages.

Features

•

BTL Output Single-phase Full-wave Linear

Driver

•

Silent Driver

•

Low Supply Current (Normal Operation，Less

than 4mA)

•

Low Standby Current (PWM=0 Duty) @

Supply Current Less than 200

µA

•

Speed Controllable by PWM Input Signal

•

Built-in Quick Start Function

•

Built-in Lock Protection and Auto Restart

Function

•

Built-in Hall Bias Circuit

•

Built-in FG Output

•

Built-in Thermal Shutdown Circuit

•

Built-in Over Current Protection Circuit

Applications

•

Silent Fan Motors

Figure 1. Package Types of AM9789

MSOP-8

MSOP-10

DFN-3×3-8

DFN-3×3-10