SUMMIT Microelectronics: Product Guide: SMH4803A Product Summary

Preliminary

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SMH4803A Distributed Power Hot Swap Controller 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 3 DC/DC Converters Not Enabled until Host Supply Fully Soft Started Programmable Time Delay Between each Enable Signal Available Input to hold off Dependant Enables until Conditions are Satisfied Highly Programmable Circuit Breaker Programmable Quick-TripTM Values Programmable Current Limiting Programmable Circuit Breaker Mode: Latched (Volatile or Nonvolatile) 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 Nonvolatile Programming to Customize Features Available Pre-programmed from Summit N2.5V and 5.0V Reference Outputs Available Pre-programmed from Summit Easy Expansion of External Monitor Functions Supply Range +20VDC to >+500VDC

OVERVIEW The SMH4803A is an integrated solution for high reliability systems to monitor and react to events that could have a detrimental effect on a system. It can contain or limit faults to a single circuit board before that fault propagates to the system. Its programmability lets a single board satisfy multiple circuit demands while customized to meet special requirements. The SMH4803A monitors and controls the primary voltage in a distributed power system while providing for both hot-swapping and secondary voltage sequencing in multi-supply systems. The primary power source can be shut down if events are sensed that could result in damage to either the circuit board or the system supply. An external FET switch is used to soft start the primary voltage once normal operating conditions are met. The external FET also uses an external shunt to monitor current for the circuit breaker function. The SMH4803A sequences secondary voltage by timed or externally controlled outputs that enable DC/DC converters. Its reference voltages provide isolation between primary and secondary voltages, but allow expansion of its features. [continued in the PDF]

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. Please check the Summit Microelectronics, Inc. web site at www.summitmicro.com for data sheet updates.