UCD74111 is a multi-chip module integrating a driver device and two NexFET power MOSFETs
into a thermally enhanced compact, 5 mm × 7 mm, QFN package. A 15-A output current capability makes
the device suitable for powering DSP and ASIC. The device is designed to complement digital or
analog PWM controllers. The PWM input of the driver device is 3-state compatible. Two driver
circuits provide high charge and discharge current for the high-side N-channel FET switch and the
low-side N-channel FET synchronous rectifier in a synchronous buck converter.
A precision current sensing amplifier that processes the voltage present across an
external current sense element measures and monitors the output current. The PWM controller on the
IMON pin can use this amplified signal. On-board comparators monitor the voltage across the
high-side switch and the voltage across the external current sense element to safeguard the power
stage from sudden high-current loads. A single resistor for the high-side comparator sets the
blanking delay. This delay guards against false reports coincident with switching edge noise. In
the event of a high-side fault or an overcurrent fault, the high-side FET turns OFF and the fault
flag (FLT) asserts to alert the PWM controller.
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