A1442: Low Voltage Full Bridge Brushless DC Motor Driver with Hall Commutation and Soft-Switching, and Reverse Battery, Short Circuit, and Thermal Shutdown Protection

This part is discontinued. Samples are no longer available.

Date of status change: March 4, 2013.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A1442 is a full-bridge motor driver 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 have been employed to achieve full device functionality down to low VDD values. This fully integrated single chip solution provides enhanced reliability (including reverse battery protection and output short circuit protection) and eliminates the need for any external support components.

The A1442 employs a soft-switching algorithm to reduce audible switching noise and EMI interference. 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 the device on and off.

The A1442 is optimized for vibration motor applications in cellular phones, pagers, electronic toothbrushes, hand-held video game controllers, and low power fan motors.

The small package outline and low profile make this device ideally suited for use in applications where printed circuit board area and component headroom are at a premium. It is available in a lead (Pb) free, 6 pin MLP/DFN microleadframe package, with an exposed pad for enhanced thermal dissipation.

• Low voltage operation
• Reverse voltage protection on VDD and SLEEP pins
• Output short circuit and thermal shutdown protections
• Soft switching algorithm to reduce audible switching noise and EMI interference
• Unidirectional working mode provides motor rotation in one direction
• Hall chopper stabilization technique for precise signal response over operating range
• Sleep mode pin allowing external logic signal enable/disable to reduce average power consumption
• Antistall feature guarantees continuous rotation
• Low current consumption sleep mode
• Single-chip solution for high reliability
• Miniature MLP/DFN package