1/8

MA477

Major Power Technology Co., Ltd.

Rev. 1.3

May.16, 2016

Single Phase Hall Effect Fan Driver



GENERAL DESCRIPTION

The MA477 is an integrated Hall sensor with H-Bridged output driver designed for

brushless DC motor applications. The device is using HV BCD process 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.

Placing the device in a variable magnetic field, if the magnetic flux density is larger

than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is

held until the magnetic flux density reverses and falls below BRP, then causes DO to be

turned to drive and DOB turned to sink.MA477 are available in SIP-4L & SOT23-5L

package.



FEATURES

- On-Chip High sensitivity Hall-effect Sensor

- Operating Voltage: 3.5V to 20V

- H-Bridge Output Drivers for Single Coil

- Thermal Shutdown Protection

- Low Output Switching Current Noise

- -40°C to 85°C Operating Temperature

- Low Profile SIP-4L & SOT23-5L Package



BLOCK DIAGRAM