Inverting outputs of the UCCx7323 and OUTA of the UCCx7325 are intended to drive external P-channel MOSFETs. Noninverting outputs of the UCCx7324 and OUTB of the UCCx7325 are intended to drive external N-Channel MOSFETs.
Each output stage is capable of supplying ±4-A peak current pulses and swings to both VDD and GND. 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 RDS(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 external MOSFET.
This means that in many cases, external-Schottky-clamp diodes are not required. The UCCx732x family delivers 4 A of gate drive where it is most needed during the MOSFET switching transition – at the Miller plateau region – providing improved efficiency gains. A unique Bipolar and MOSFET hybrid output stage in parallel also allows efficient current sourcing at low supply voltages.