A3921 Datasheet - Allegro

A3921 Automotive Full Bridge MOSFET Driver

The A3921 is a full-bridge controller for use with external N‑channel power MOSFETs and is specifically designed for automotive applications with high-power inductive loads, such as brush DC motors. A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and .

A3921 Features

* High current gate drive for N-channel MOSFET full bridge

* High-side or low-side PWM switching

* Charge pump for low supply voltage operation

* Top-off charge pump for 100% PWM

* Cross-conduction protection with adjustable dead time

* 5.5 to 50 V sup

A3921-Allegro.pdf