1/7

MA477M

Major Power Technology Co., Ltd.

Rev.1.5

Single Phase Hall Effect Fan Driver

❖

GENERAL DESCRIPTION

The MA477M 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, 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.

❖

FEATURES

-

On-Chip High Sensitivity Hall-effect Sensor

-

Operating Voltage: 3.5V to 20V

-

H-Bridge Output Drivers for Single Coil

-

Built-in Reverse Protection Diode

-

Thermal Shutdown Protection

-

Low Output Switching Current Noise

-

-40°C to 125°C Operating Temperature

-

Low Profile SOT23-6F and SIP-4L Packages

❖

PIN ASSIGNMENT

The packages of MA477M are SOT23-6F & SIP-4L; the pin assignment is given by:

(Sensor Location)

(Top View)

1

2

3

4

6

DOB

NC

VDD

GND

DO

SOT23-6F

1.0mm

0.8mm

5

VDD

(Marking Side)

1.30mm

1.9mm

1

VDD

2

DO

3

DOB

(Marking Side)

4

GND

(Sensor Location)

SIP-4L

Name

Description

VDD

Supply Voltage

DO

Output 1

GND Ground.