Built-in high sensitivity Hall-effect sensor
Complementary open drain driver with Zener clamp output
Output BTL soft-switching to reduce vibration and acoustic noise
Lock-shutdown protection & auto-restart function
Thermal shutdown protection
Available in SIP-4L package
For 24V BLDC motor / FAN systems
General Description
FD2157H is a two-phase half-wave BLDC motor driver IC. It integrates the complementary open drain MOSFET, a high sensitivity Hall-effect sensor and a digital control logic for rotor locked shutdown and re-start control, which simplifies the PCB(printed circuit board) design and make the fabrication of small-size BLDC motors possible. 
Output BTL soft-switching is used to reduce the BLDC motors vibration and acoustic noise.
For safety, Lock-shutdown function would turn the IC’s internal drivers off avoiding over-heat when the rotor is locked, and IC will try to re-start the rotor’s torque after the time of these drivers’ shutdown.
The Thermal shutdown protection ensures the BLDC motors to operate under specified temperature ranges.