Linear Technology's dual ideal diode with Hot Swap controller provides PowerPath and inrush current control for redundant supplies operating from 2.9 to 18V. The LTC4227 diode regulates the forward voltage drop across two external N-channel MOSFETs to ensure current transfer between supplies in diode-OR applications. The MOSFET protects the board and backplane from damage during live insertion and removal, and protects from short-circuit faults with a swift acting current limit and circuit breaker. Prioritisation of the two supplies is made possible by a D2ON# pin, which turns off the diode for a low priority supply.
In addition to redundant power supply ORing, the diode is a suitable replacement for supply holdup applications. The diode is offered in a 20-lead 4x5mm QFN or 16-lead SSOP package. The company has also introduced the LTC4225 that provides two independent ideal diode and Hot Swap paths for two power rails. The diode can be configured as a power prioritiser and is suited for MicroTCA systems, where the outputs of 12V power modules are used to power multiple mezzanine cards. The diode is offered in 24-lead 4x5mm QFN or SSOP packages. Commercial and industrial grades offer operating temperature ranges from 0 to 70°C and -40 to 85°C, respectively.
