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the fr9831b is a synchronous step-down dc/dc converter that provides wide 4.5v to 40v input voltage range and 0.6a continuous load current capability. at light load condition, the fr9831b can operate at power-saving mode to support high efficiency and reduce power loss.

the fr9831b fault protection includes cycle-by-cycle current limit, uvlo and thermal shutdown. the soft-start function prevents inrush current at turn-on. this device uses current mode control scheme which provides fast transient response. internal compensation function reduces external compensation components and simplifies the design process. in shutdown mode, the supply current is less than 10μa.

• wide input voltage range: 4.5v to 40v
• 0.8v reference voltage
• 0.6a output current
• 500khz switching frequency
• integrated power mosfet rds(on) (480/300mω)
• <10μa shutdown current
• internal 0.5ms soft-start
• internal compensation function
• cycle-by-cycle current limit
• over-temperature protection with auto recovery
• input under voltage lockout
• sot-23-6 package