MOSFET gate driver / IGBT

The A4900 is a high-voltage, high-speed, power IGBT or MOSFET driver providing three independent half-bridge channels for three-phase applications.

A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs or IGBTs used as high current switches. Direct control over all six gate drives in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power switches are protected from cross-conduction by integrated crossover control and fixed dead time.

Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults. They can be configured to protect the power switches under most short circuit conditions. Detailed diagnostics are available as a serial data word output.

The A4900 is provided in a 44-pin QSOP package (suffix LQ) that is lead (Pb) free, with 100% matte tin leadframe plating.