SMH4812 Datasheet | Summit Microelectronics

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-Trip TM 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 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 - .summitmicro. .. Preliminary DESCRIPTION The SMH4812 is designed to control hot swapping of plugin cards operating from a single supply, which can have an output range from 20V to 500V. The SMH4812 hot-swap controller provides under-voltage and over-voltage monitoring of the host power supply, it drives an external power MOSFET switch that connects the supply to the load, and it protects against over-current conditions that might disrupt the host supply. When the input and output voltages to the SMH4812 controller are within specification it provides a Power Good logic output that may be used...