The FR9854 is a synchronous step-down DC/DC converter with fast constant on time control technique (FCOT) that provides 4.5V to 18V input voltage range and 4A continuous load current capability. At light load condition, the FR9854 can operate at power saving mode to support high efficiency and reduce power loss.
The FR9854 fault protection includes cycle-by-cycle current limit, UVLO, short circuit protection and thermal shutdown. The soft-start function prevents inrush current at turn-on. The characteristics scheme of FR9854 are fast constant on time control which provides fast transient response, the noise immunity and all kinds of very low ESR output capacitor for ensuring performance stabilization.
The FR9854 is offered in SOP-8 (exposed pad) and TQFN-16 (3mm x 3mm) packages, which provides good thermal conductance.