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SUMMIT

MICROELECTRONICS, Inc.

SMH4811A

Programmable Distributed Power Hot-Swap Controllerfor High-Availability Systems

Preliminary

FEATURES

Soft Starts Main Power Supply on Card Insertionor System Power Up Programmable Host Voltage Fault Monitoring Programmable Under-Voltage Hysteresis Senses Card Insertion via Short Pins or EjectorSwitches Programmable UV/OV Voltage Filter Master Enable to Allow System Control ofPower Up or Down Programmable Fault Mode: Latched or DutyCycle Can be used as a Temperature Sense Input Programmable Forced Shutdown Timer Programmable Independent Controls of a DC/DCConverter 2.5V and 5.0V Reference Outputs Eliminates the Need for Other PrimaryVoltages Not Enabled until Host Supply Fully SoftStarted Easy Expansion of External Monitor Func-tions Programmable Time Delay Available Input to hold off Dependant En-ables until Conditions are Satisfied Internal Shunt Regulator Allows a Wide SupplyRange Highly Programmable Circuit Breaker Programmable Quick-Trip
TM Values Programmable Current Limiting Programmable Duty Cycle Times Programmable Over-current Filter

SIMPLIFIED APPLICATION DRAWING

0V –48V

VDD VSSCBSENSE ENPGDisable/Enable PD1# PD2#UVOV2.5VREFPG#5.0VREF FAULT#

SMH4811A

DC/DC Pin Detect Pin Detect VGATE 2044 SAD 5.1 ©SUMMIT MICROELECTRONICS, Inc., 2006 • 757 North Mary Ave • Sunnyvale, CA 94085 • Phone 408-523-1000 • FAX 408-523-1266 • www.summitmicro.com Characteristics subject to change without notice 2044 6.5 1/12/09 1