DESCRIPTION
The SMH4811A is designed to control hot swapping of plug-in cards operating from a single supply ranging from 20V to 500V. It provides under-voltage and over-voltage monitoring of the host power supply, drives an external power MOSFET switch that connects the supply to the load, and also protects against over-current conditions that might disrupt the host supply. When the input and output voltages to its controls are within specification it provides a Power Good logic output that may be used to turn loads on (e.g., an isolated-output DC-DC converter, or drive a LED status light). Additional features of the SMH4811A include: temperature sense or master enable input, 2.5V and 5V reference outputs for expanding monitor functions, two Pin-Detect enable inputs for fault protection, and duty-cycle over-current protection.

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 a DC/DC Converter
    ♦ Not Enabled until Host Supply Fully Soft Started
    ♦ Programmable Time Delay
    ♦ Available Input to hold off Dependant Enables until Conditions are Satisfied
● Highly Programmable Circuit Breaker
    ♦ Programmable Quick-TripTM Values
    ♦ Programmable Current Limiting
    ♦ 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
● Programmable Forced Shutdown Timer
● 2.5V and 5.0V Reference Outputs
    ♦ Eliminates the Need for Other Primary Voltages
    ♦ Easy Expansion of External Monitor Functions
● Internal Shunt Regulator Allows a Wide Supply Range