1/7

MA477L

Major Power Technology Co., Ltd.

Rev.1.0

15

th, May., 2020

Single Phase Hall Effect Fan Driver



GENERAL DESCRIPTION

The MA477L 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. MA477L is available in SIP-4L.



FEATURES

-

On-Chip High Sensitivity Hall-effect Sensor

-

Operating Voltage: 3.5V to 26V

-

H-Bridge Output Drivers for Single Coil

-

Thermal Shutdown Protection

-

Low Output Switching Current Noise

-

-40°C to 125°C Ambient Temperature Range

-

Low Profile SIP-4L Package



BLOCK DIAGRAM

Hall

Plate

Control

Logic

Regulator

H - bridge MOS

Driver

VDD

DOB

DO

Amp.

GND

Thermal

shutdown