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