AM9799

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.

Feature(s)

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

Application(s)

CPU Cooler Fan in Notebook Personal Computers