6439CBZ Datasheet (Intersil Corporation)

6439CBZ, ISL6439CBZ

14 LEAD SOIC GND 1 LGATE 2 CPVOUT 3 CT1 4 CT2 5 OCSET 6 FB 7 14 UGATE 13 BOOT 12 PHASE 11 VCC 10 CPGND 9 ENABLE 8 COMP PHASE Connect this pin to the upper MOSFET’s source.

This pin is used to monitor the voltage drop across the upper MOSFET for overcurrent protection.

UGATE Connect this pin to the

® ISL6439, ISL6439A Data Sheet November 5, 2008 FN9057.5 Single Sync Buck PWM Controller for Broadband Gateway Applications The ISL6439 makes easy work out of implementing a complete control and protection scheme for a DC/DC step-down converter.

Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6439 integrates the control, output adjustment, monitoring and protection functions into a single package.

The ISL6439 provides simple, single feedback loop, voltagemode control

6439CBZ Features

* a 15MHz gain-bandwidth product and 6V/μs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation app