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