General Description:
W277 is designed to integrate Hall sensor with complementary output drivers and frequency generator together on the same chip, it is suitable for speed measurement, revolution counting, positioning, and DC brushless motors. It includes a temperature compensated voltage regulator, a differential amplifier, a Hysteresis controller, two open-collector output drivers capable of sinking 500mA current load. An on-chip protection diode is implemented to prevent reverse power fault. And built-in thermal lock protection and auto-restart function is suitable for super high speed fan. It can replace the function of lock protection and auto restart function. The power will be shutdown automatically at 120°C to prevent the coils be damaged and atuo-restart after cooling down.

FEATUREs:
● Operate from 2.8V to 24V supply voltage.
● On-chip Hall sensor.
● Internal bandgap regulator allows temperature compensated operations and a
   wide operating voltage range.
● High output sinking capability up to 500mA for driving large load.
● Lower current change rate reduces the peak output voltages during switching.
● Available in rugged low profile SIP-4L packages.
● Built-in protection diode for reverse power supply fault.
● Built-in thermal lock protection and auto-restart function.