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the fr9856b is a synchronous step-down dc/dc converter with fast constant on time (fcot) mode control. the device provides 4.5v to 18v input voltage range and 6a continuous load current capability. operation frequency depends on input and output voltage condition. at light load condition, the fr9856b can operate at power saving mode to support high efficiency and reduce power loss.

the fr9856b fault protection includes cycle-by-cycle current limit, short circuit protection, uvlo and thermal shutdown. the soft-start function prevents inrush current at turn-on. the fr9856b use fast constant on time control that provides fast transient response, the noise immunity and all kinds of very low esr output capacitor for ensuring performance stabilization.

the fr9856b is offered in sop-8 (exposed pad) package, which provides good thermal conductance.

• low rds(on) integrated power mosfet (40mω/26mω)
• wide input voltage range: 4.5v to 18v
• output voltage range: 0.765v to 8v
• 6a output current
• fcot mode enables fast transient response
• pseudo 650khz frequency
• power good function
• input under voltage lockout
• cycle-by-cycle current limit
• hiccup short circuit protection
• over temperature protection with auto recovery
• sop-8 (exposed pad) package