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