SMH4803A Datasheet | Summit Microelectronics

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-Trip TM 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# ENPGA ENPGB PG1# DC/DC UV R2 OV R1 Pin Detect PD2# VSS CBSENSE VGATE DRAIN SENSE PG2# DC/DC PG3# DC/DC FAULT# 2.5VREF 5.0VREF - 48V Characteristics subject to change without notice 2051 4.4 3/15/01 2051 SAD 1.2 ©SUMMIT MICROELECTRONICS, Inc., 2000 - 300 Orchard City Dr., Suite 131 - Campbell, CA 95008 - Phone 408-378-6461 - FAX 408-378-6586 - .summitmicro. .. Preliminary FUNCTIONAL BLOCK DIAGRAM ENPGB 15 ENPGA 16 VDD 20 12VREF 14 2.5VREF 50kΩ 50kΩ...