DC2055A: 1V @ 120A, 4.5 ~ 14V in, Buck

Demonstration circuit 2055A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input voltage range. It can supply up to 120A of load current with a 1.0V output. This demo board has two each LTC®3875EUJ feature-rich dual-phase synchronous current mode buck controllers with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing. This board is set up with 0.32mΩ DCR output inductors. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing.

The LTC3875 is suitable for inputs from 4.5V to 38V and outputs up to 3.5V. It can provide a high efficiency, high power density and versatile power solution for telecom and datacom systems, industrial, medical instruments, and DC power distribution. The LTC3875 is available in a 40-lead 6mm × 6mm QFN package.

To shut down the converter, set the RUN pin voltage below 1.0V (SW1 and SW2: both OFF). Use JP1 jumper to select Burst Mode® operation, pulse-skipping mode or forced continuous mode operation at light load. The switching frequency is pre-set at about 400kHz, and it can be easily modified from 250kHz to 720kHz. An onboard dynamic circuit is also available for a load transient test. Please see LTC3875 data sheet for more detailed information.