„ General Description
AH477/480 is the integrated Hall sensor with output drivers designed for electrical commutation of brush-less DC motor application. The devices are included as follows: on-chip Hall voltage generator for magnetic sensing; the error amplifier that amplifies the Hall voltage; a comparator is to
provide switching hysteresis for noise rejection; the bi-direction drivers for sinking and driving large
current load. Internal bandgap regulator is used to provide temperature compensated bias for internal

„ Features
- On-chip Hall sensor
- Bi-direction H type output drivers for single coil
- Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range
- High output sourcing/sinking capability up to 350mA
- Operating voltage: 3.5V~20V
- Low output switching current noise
- Auto-shutdown and auto-restart provided (AH480)
- SIP-4L package for AH477; SIP-5L, MSOP-8L packages for AH480

„ Applications
- Single-coil Brush-less DC Fan
- Single-coil Brush-less DC Motor
circuits and allows a wide operating supply voltage
range. On top of that, AH480 provides auto
shutdown and auto restart function for the DC fan to
consume less power in the lock up condition.