Summit Microelectronics, Inc. - Power Management for Communications™

Summit Microelectronics, Inc.

SMH4802 Programmable -48V Hot-Swap Controller with Forced Shut Down

Preliminary Information (see below)

Product Summaries:



Download/view the entire SMH4802 data sheet

Download/view the SMH4802 Eval Kit User Guide

Download the GUI Programming Software 4802.ZIP

Applications Note 36 - SMH4802 -48V Programmable Hot Swap Power Controller Windows GUI Users Guide and Configuration Register Descriptions


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FEATURES

Soft Start Power Supply

Live Insertion into a -48V backplane

Programmable Control of a DC/DC Converter

I2C Power On/Off Control

Highly Programmable Circuit Breaker

Active In-rush Current Limiting

Over-current Filter Circuit Breaker Immunity to Voltage Steps and Current Spikes

Programmable Forced Shutdown Timer

Internal Shunt Regulator Allows a Wide Supply Range

14-pin SOIC and 16-pin SSOP packages


APPLICATIONS

-48V Power Distribution

Telecom Line Cards

Central Office Switching

High Availability Servers

Hot Board Insertion


SMG4802-FIG01-Typical line-card Application

FIGURE 1- The drawing illustrates the SMH4802 in a typical line-card application. It should be noted this is just an example, and the specific component values are purposely not shown. Pin numbers reflect SOIC package.



INTRODUCTION

The SMH4802 is designed to control in-rush current during hot swapping of plug-in cards operating in a distributed power environment. The device drives an external power MOSFET switch that connects the supply to the load and protects against over-current conditions that might disrupt the host supply. It also provides undervoltage and over-voltage monitoring of the host power supply. When the source and drain voltages of the external MOSFETs are within specification it will provide a Power Good logic output that can be used to enable a DC/DC converter. Additional features of the device include: temperature sense or master enable input, a 5V reference output for expanding monitor functions, and duty-cycle or latched over-current protection modes. An internal Shunt regulator allows a wide supply range. The SMH4802 -48V Hot-Swap Controller also features a simple software I2C Power On/Off Interface for remote power control applications

Programming of configuration, control and calibration values by the user can be simplified with the SMX3200 interface adapter and a windows based GUI supplied by Summit

 


BLOCK DIAGRAM

SMH4803-Functional Block Diagram
Figure 2. Functional Block diagram. Pin numbers reflect SOIC package.







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This is a Preliminary Information data sheet that describes a Summit product currently in pre-production with limited characterization.

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.

Revision 2.3 - This Document supersedes all previous versions.

I2C is a trademark of Philips Corporation.

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