SMH4804 - Summit Microelectronics

SMH4804 -48V Programmable Hot Swap Sequencing Power Controller

FUNCTIONAL DESCRIPTION The SMH4804 integrated hot swap power controller operates within a wide supply range, typically -32 to -72 volts, and generates the signals necessary to drive isolatedoutput DC/DC converters. The general start-up procedure is as follows: • A physical connection must first be made with the chassis to discharge any electrostatic voltage.

Features

AND APPLICATIONS INTRODUCTION The SMH4804 is a user-programmable -48V power supply controller designed to control the hot-swapping of plug-in cards and to sequence supplies in a distributed power environment. The SMH4804 drives an external power MOSFET switch that connects the bus side supply to the card side load and controls in-rush current while providing both current regulation and over-current protection. When the source and drain voltages of the external MOSFET are within specification, the SMH4804 asserts four PG[4:1]# power-good logic outputs either simultaneously or sequenced at prog.