These full-bridge motor driver ICs are designed to drive low-voltage, brushless dc motors. Commutation of the motor is achieved by use of a single Hall element sensor to detect the rotational position of an alternating-pole ring magnet.
A high-density, CMOS semiconductor process allows the integration of all the necessary electronics. This includes the Hall element sensor, the motor control circuitry, and the full output bridge. Low-voltage design techniques are used to achieve full device functionality down to low VDD values. These devices are fully integrated single chip solutions, which provide enhanced reliability (including reverse battery protection and output short circuit protection) and eliminate the need for external support components.
Soft-switching algorithms are employed to reduce audible switching noise and EMI interference. Additionally, a micropower sleep mode can be enabled by an external signal, to reduce current consumption for battery management in portable electronic devices. This feature allows the removal of a FET transistor for switching these devices on and off.