Smallest single chip solution for smart fan motor driver apps?

According to company, it provides a cost effective solution for fan and motor drive applications. Designed for driving low power single phase brushless dc (bldc) fans and motors, the AH5795 is said to provide an average motor current up to 500mA. The device integrates a high sensitivity Hall effect sensor, amplifier and an internal H-bridge driver output stage, suitable for single coil fan motor applications. A PWM speed control pin provides enhanced motor speed control by varying the duty ratio of the PWM signal, in addition to the supply voltage. The device's operating voltage range of 1.8 to 6V caters for low operating voltage bldc fans requiring low voltage start up in both Vdd and PWM speed control modes. The AH5795's bidirectional full bridge driver uses soft switching to minimise audible switching noise and emi. To protect the coil from overheating, the new motor controller includes integrated locked rotor detection and automatic self restart functions, which serve to shutdown the output driver in the event of a locked rotor and then restart the motor when the rotor is freed. A tachometer output is provided by an open drain frequency generator, which allows external speed monitoring. The all in one smart motor controller is designed to eliminate the need for most of the external components, including a timing capacitor. The AH5795 has an ambient operating temperature range of –40 to 105?C, suitable for applications such as enclosed space in fan motors. Diodes says an additional member of the smart fan motor controller family will be launched later this year, which includes all of the features and functionality of the AH5795 plus internal timing advance to improve tail end current and reduce audible emi noise.