FEATURES AND BENEFITS

Speed curve configuration via EEPROM

• I2C serial port

• Sinusoidal modulation for reduced audible noise and

low vibration

• Sensorless (no Hall sensors required)

• Low RDS(ON) power MOSFETs

• 3.3 V / 20 mA linear regulator

• PWM or analog speed input

• FG speed output

• Slew rate control

• Lock detection

• Soft start

• Low power standby mode

• Overcurrent protection

• Overvoltage protection

DESCRIPTION

The A5947G three phase motor driver IC incorporates sensorless

sinusoidal drive to minimize vibration for a wide variety of

fan applications. Sensorless control eliminates the requirement

for Hall sensors.

A flexible closed-loop speed control system is integrated into

the IC. EEPROM is used to tailor the common functions of the

fan speed curve to a specific application. This eliminates the

requirement for a microprocessor-based system and minimizes

programming requirements.

The A5947G is available in a 28-contact 5 mm × 5 mm QFN

with exposed thermal pad (suffix ET) and a 20-lead TSSOP

with exposed thermal pad (suffix LP).