Summit Microelectronics, Inc. - Power Management for Communications™

Summit Microelectronics, Inc.

  

SMH4812 Distributed Power Hot Swap Controller

Product Numbers

 

Download the entire SMH4812 data sheet in PDF format.

Download resistor value calculations and tolerance analysis for R1, R2, and R3.

Read our press release regarding the SMH4812

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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

OVERVIEW

The SMH4812 is designed to control hot swapping of plug-in 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 to enable a DC-DC converter.

Additional features of the device include: temperature sense or master enable input, 2.5V and 5V reference outputs for expanding monitor functions, two Pin-Detect enable inputs for fault protection, and duty-cycle or latched over-current protection modes. All of these features can be programmed by the factory according to the user's requirements.

 

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