The LTC4223 is a dual Hot Swap™ controller that meets the power requirements of the MicroTCA specification. It includes an internal 3.3V auxiliary supply channel and an external N-channel driver for the 12V payload supply. It controls the inrush current for both supplies, provides overcurrent protection, and features an adjustable analog current limit. Additionally, it provides power-good outputs for the two supplies, a fault output, card detection, and independent control of the two supplies.
This document describes the LTC4223, a dual hot swap controller designed to meet the requirements of the Micro Telecommunication Computing Architecture (MicroTCA) specification ratified by PICMG. The device includes an internal pass FET for the 3.3V auxiliary supply and drives an external N-channel pass FET for the 12V payload supply.
The LTC4223 meets the power requirements of the Micro Telecommunication Computing Architecture (MicroTCA) specification.
The auxiliary supply has a fixed 240mA active current limit.
The 12V ramp rate is controlled by an external capacitor.