Integrated Digital Audio Amplifier The IR4321M multichip module offers the same or higher output power as monolithic alternatives with minimal heatsinking. This solution integrates a PWM controller, high-voltage gate driver, and 2 low RDS(ON) MOSFETs. It includes standard class D protection features for reliable operation over various environmental conditions. The IR4321M 5x6 mm PQFN22 package showcases the benefit of a small footprint and high-power density.