DESCRIPTION

The SMH4812 is designed to control hot swapping of plugin cards operating from a single supply, which can have an output range from 20V to 500V. The SMH4812 hot-swap controller provides under-voltage and over-voltage monitoring of the host power supply, it drives an external power MOSFET switch that connects the supply to the load, and it protects against over-current conditions that might disrupt the host supply.

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

● Supply Range ±20VDC to >±500VDC