MOSFET driver IC launched for automotive apps

An N-Channel power MOSFET driver from Allegro MicroSystems can isolate a three phase load by controlling the in-phase isolation MOSFETS.

The A6862 motor driver IC is intended for automotive systems that must meet automotive safety integrity level requirements. The device was designed for electronic power steering systems, electric braking and three phase relay driver applications.

The driver is intended to replace a relay driven motor disconnect in automotive safety critical systems. It also provides the drive for reverse battery protection and battery isolation.

The A6862 has three independent floating gate drive outputs to maintain the power MOSFETs in the on state, or the off state, over the full supply range in the presence of high phase-voltage slew rates.

An integrated charge pump regulator provides the battery supply voltage necessary to maintain the power MOSFETs in the ON state continuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate drive of more than 7.5V for battery voltages down to 4.5V with 100kΩ gate-source resistors.

The gate drives can be independently controlled by a logic level control input. In typical applications, the MOSFETs will be switched on within 8μs and will switch off within 1μs.

The generation offers the addition of a single input control, two independent activation inputs to put the A6862 into a low power sleep mode, and added gate to source protection to further assist end users to achieve critical system safety goals.

The device is available in a 16-lead TSSOP package with an exposed pad for enhanced thermal performance.

Author
Peggy Lee