General Description

The AH477A is an integrated Hall sensor with H bridged output driver designed for brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies

the Hall voltage, a comparator to provide switching hysteresis for noise rejection, a bi-directional drivers

for sinking and driving large current load. It also includes an internal bandgap regulator to provide tem

perature compensated bias for internal circuits and allows a wide operating supply voltage range.

Features

· On-Chip Hall Sensor

· Operating Voltage: 3.5V to 18V

· H-Bridge Output Drivers for Single Coil

· Internal Bandgap Regulator for Temperature Compensation

· Low Output Switching Current Noise

· Operating Temperature: -20oC to 85oC

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 6000V (Human Body Model)

· Suitable for PWM Power Supply Control Speed

Applications

· Single-coil Brushless DC Motor

· Single-coil Brushless DC Fan