SMH4803A

SUMMIT MICROELECTRONICS, Inc. Distributed Power Hot Swap Controller www.DataSheet4U.com SMH4803A Preliminary FEATURES l Soft Starts Main Power Supply on Card Insertion or System Power Up l Senses Card Insertion via Short Pins or Ejector Switches l Master Enable to Allow System Control of Power Up or Down w Can be used as a Temperature Sense Input l Programmable Independent Controls of 3 DC/DC Converters w Not Enabled until Host Supply Fully Soft Started w Programmable Time Delay Between each Enable Signal w Available Input to hold off Dependant Enables until Conditions are Satisfied l Highly Programmable Circuit Breaker w Programmable Quick-TripTM Values w Programmable Current Limiting w Programmable Circuit Breaker Mode: Latched (Volatile or Nonvolatile) w Programmable Duty Cycle Times w Programmable Over-current Filter l Programmable Host Voltage Fault Monitoring w Programmable Under- voltage Hysteresis w Programmable UV/OV Voltage Filter w Programmable Fault Mode: Latched or Duty Cycle l Nonvolatile Programming to Customize Features w Available Pre-programmed from Summit l 2.5V and 5.0V Reference Outputs w Eliminates the Need or Other Primary Voltages w Easy Expansion of External Monitor Functions l Supply Range ±20VDC to >±500VDC SIMPLIFIED APPLICATION DRAWING 0V Disable / Enable Pin Detect R3 PD1# VDD ENPGA ENPGB PG1# DC/DC UV R2 OV R1 Pin Detect PD2# VSS CBSENSE VGATE DRAIN SENSE PG2# DC/DC SMH4803A PG3# DC/DC FAULT# 2.5VREF 5.0VREF –48V Characteristics su...