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the fr9863 is a synchronous step-down dc/dc converter with fast constant on time (fcot) mode control. the device provides 4.5v to 28v input voltage range and 3a continuous load current capability. operation frequency depends on input and output voltage condition. at light load condition, the fr9863 can operate at power saving mode to support high efficiency and reduce power loss.
the fr9863 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 fr9863 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 fr9863 is offered in tsot-23-6 package, which provides good thermal conductance.

• low rds(on) integrated power mosfet (80mω/40mω)
• wide input voltage range: 4.5v to 28v
• output voltage range: 0.596v to 12v
• 3a output current
• fcot mode enables fast transient response
• pseudo 500khz frequency
• input under voltage lockout
• internal 1.0ms soft-start
• cycle-by-cycle current limit
• hiccup short circuit protection
• over temperature protection with auto recovery
• tsot-23-6 package