GENERAL DESCRIPTION

The MA7121 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, bi-directional drivers for sinking and driving large current load.

To avoid coil burning, rotor-lock shutdown detection circuit shut down the output driver if

the rotor is blocked and then the automatic recovery circuit will try to restart the motor. This

function repeats while rotor is blocked. Until the blocking is removed, the motor recovers

running normally.

FEATURES

- On-Chip High Sensitivity Hall-effect Sensor

- Operating Voltage: 2.5V to 28V

- H-Bridge Output Drivers for Single Coil

- Thermal Shutdown Protection

- Low Output Switching Current Noise

- -40°C to 125°C Operating Temperature

- Rotor-locked Shutdown and Automatically Restart Function

- Start-up Voltage: 2V(minimum)

- For 5V/12V/24V DC motor / FAN systems

- Low Profile SIP-4L Package