SUMMIT Microelectronics:Product Summary: SMH4812 - Distributed Power Hot Swap Controller

SMH4812 Distributed Power Hot Swap Controller



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			Download the entire SMH4812 data sheet in PDF format.
			Download resistor value calculations and tolerance analysis for R1, R2, and R3.

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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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SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission.

SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances.

This document supersedes all previous versions.