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
● Supply Range ±20VDC to >±500VDC
● Versatile Card Insertion Detection Supports:
    ♦ Multi-length Pin Systems
    ♦ Card Injector Switch Sensing
    ♦ Programmable Debounce Periods
● Control Powering-on of DC/DC Converters
● Highly Programmable Host Voltage Monitoring
    ♦ Programmable Under- and Over-voltage Detection
    ♦ Programmable UV Filter
● Programmable Power Good Delay for enabling the DC/DC Converter
● Programmable Circuit Breaker Function
    ♦ Programmable Over-Current Filter
    ♦ Programmable Quick-Trip™ Circuit Breaker Values
● 2.5V and 5.0V reference outputs
    ♦ Easy Expansion of External Monitor Functions