Preliminary Datasheet

Single Phase Full-wave Low Voltage Fan Motor Driver

AM9799

Jun. 2011

Rev. 1. 1

BCD Semiconductor Manufacturing Limited

1

General Description

The AM9799 is a single-phase DC brushless motor

driver IC featuring BiCMOS process. It is suitable for

fan motor drivers for low voltage equipment such as

the note personal computers. The AM9799 includes

lock shutdown, automatic restart, frequency generator

(FG), have been incorporated into one chip. When the

motor is under lock condition, lock shutdown

function turns off the output current. When the lock

condition is removed, the IC automatically restarts

and allows DC fan to run. In addition, the FG

function is to output rotation speed signal. It features

MOS-FET

driver

circuit

for

better

saturation

characteristics. Slew late of amplifiers and feedback

resistors are optimized to achieve low-noise motor

operation.

The AM9799 is available in MSOP-8 package.

Features

•

Lock Detection and Rotational Speed Sensing

Mechanisms are Built-in

•

Rotor-locked Protection and Automatic Restart

When the Motor Lock is Undone

•

Hall Bias Built-in and Hall Inputs Have a

Hysteresis

•

Built-in Thermal Shutdown Circuit

•

Built-in Over Current Protection

•

Built-in Short Protection

•

Operating Voltage: VCC=2V to 6V

•

BiCMOS Technology

•

Compact Package: MSOP-8

Applications

•

CPU

Cooler

Fan

in

Notebook

Personal

Computers

Figure 1. Package Type of AM9799

MSOP-8