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fr9854
production
18v, 4a synchronous step-down dc/dc converter
applications
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.
- low rds(on) integrated power mosfet (75mω/50mω)
- fcot mode enables fast transient response
- wide input voltage range: 4.5v to 18v
- 0.765v reference voltage (for fr9854sp only)
- 0.8v reference voltage for (for fr9854w3 only)
- 8v maximum output voltage
- 4a output current
- 630khz pseudo frequency
- power good function
- adjustable soft-start function (for fr9854sp only)
- internal 1ms soft-start (for fr9854w3 only)
- cycle-by-cycle current limit
- over temperature protection with auto recovery
- input under voltage lockout
- hiccup short circuit protection
- sop-8 exposed pad and tqfn-16 (3mm x 3mm) packages
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(3mm x 3mm).jpg)
| part name | package | request | |
|---|---|---|---|
| fr9854sp | sop-8 (exposed pad) |
|
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| fr9854w3 | tqfn-16 |
|
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