The TrueDrive output stage is capable of supplying ±9-A peak current pulses; it swings to both VDD and GND and can encourage even the most stubborn MOSFETs to switch. The pullup and pulldown circuits of the driver are constructed of bipolar and MOSFET transistors in parallel. The peak output current rating is the combined current from the bipolar and MOSFET transistors. The output resistance is the R_DS(ON) of the MOSFET transistor when the voltage on the driver output is less than the saturation voltage of the bipolar transistor. Each output stage also provides a very low impedance to overshoot and undershoot due to the body diode of the internal MOSFET. This means that in many cases, external-schottky-clamp diodes are not required.

This unique BiPolar and MOSFET hybrid output architecture (TrueDrive) allows efficient current sourcing at low supply voltages. The UCC3732x family delivers 9 A of gate drive where it is most needed during the MOSFET switching transition – at the Miller plateau region – providing improved efficiency gains.