SMH4812

SUMMIT MICROELECTRONICS, Inc. Distributed Power Hot-Swap Controller www.DataSheet4U.com SMH4812 Preliminary FEATURES ! Soft Starts Main Power Supply on Card Insertion or System Power Up ! Senses Card Insertion via Short Pins or Ejector Switches ! Master Enable to Allow System Control of Power Up or Down " Can be used as a Temperature Sense Input ! Programmable Independent Controls of a DC/DC Converter " Not Enabled until Host Supply Fully Soft Started " Programmable Time Delay " Available Input to hold off Dependant Enables until Conditions are Satisfied ! Highly Programmable Circuit Breaker " Programmable Quick-TripTM Values " Programmable Current Limiting " Programmable Duty Cycle Times " Programmable Over-current Filter ! Programmable Host Voltage Fault Monitoring " Programmable Under-Voltage Hysteresis " Programmable UV/OV Voltage Filter " Programmable Fault Mode: Latched or Duty Cycle ! Programmable Forced Shutdown Timer ! 2.5V and 5.0V Reference Outputs " Eliminates the Need for Other Primary Voltages " Easy Expansion of External Monitor Functions ! Supply Range +20VDC to >+500VDC SIMPLIFIED APPLICATION DRAWING 0V Disable/Enable VDD Pin Detect PD1# ENPG FS# FAULT# UV SMH4812 OV PG2# DC/DC Pin Detect PD2# VSS CBSENSE VGATE 2.5VREF 5.0VREF –48V Characteristics subject to change without notice 2055 4.0 12/22/00 2055 SAD 1.1 ©SUMMIT MICROELECTRONICS, Inc., 2000 300 Orchard City Dr., Suite 131 Campbell, CA 95008 Phone 408-378-3970 FAX 408-378-6586 www....