ISL6545A - Intersil

ISL6545A 5V or 12V Single Synchronous Buck Pulse-Width Modulation Controller

® Data Sheet ISL6545, ISL6545A April 29, 2010 FN6305.5 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6545 makes simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter driving N-Channel MOSFETs in a synchronous buck topology. Since it can work with either 5V or 12V supplie.

Features

a 20MHz gain-bandwidth product and 9V/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 lower MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. Pinout ISL6545 (8 LD SOIC) TOP VIEW BOOT 1 UGATE 2 GND 3 LGATE/OCSET 4 8 PHASE 7 COMP/SD 6 FB 5 VCC ISL6545 (10 LD 3x3 DFN) TOP VIEW BOOT 1 UGATE 2 N/C 3 GND 4 .