INTRODUCTION

The SMH4814 is an integrated power controller designed to control the hot-swapping of plug-in cards in a distributed power environment. The SMH4814 drives external power MOSFET switches that connect the supply to the load while reducing in-rush current and providing over-current protection. When the source and drain voltages of the external MOSFETs are within specification the SMH4814 asserts the four PUP logic outputs in a programmable cascade sequence to enable the DC/DC converters.

FEATURES AND APPLICATIONS

? Eliminates Passive ORing Diodes for Reduced Power Consumption

? High Noise Immunity on All Logic Inputs

? Soft Starts Main Power Supply on Card Insertion or System Power Up with Slew Rate Control

? Programmable Differential Current Sense ? Programmable Inrush Current Limiting ? Master Enable to Allow System Control of Power-Up or -Down

? Programmable Independent Enabling of up to 4 DC/DC Converters

? Programmable Circuit Breaker Level and Mode

? Programmable Quick-Trip? Value, Current Limiting, Duty Cycle Times, Over-Current Filter

? Programmable Host Voltage Fault Monitoring

? Programmable UV/OV Filter and Hysteresis

? Programmable Fault Mode: Latched or Duty Cycle

? Internal Shunt Regulator Allows for a Wide Supply Range

Applications

? Telecom Hot-Swap Card - AdvancedTCATM

? Network Processors

? Power-on Ethernet, IEEE 802.3af