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the fr9839a is an asynchronous step-down dc/dc converter that provides wide 3.5v to 40v input voltage range and 5a continuous load current capability. a wide adjustable switching frequency range allows either efficiency or external component size to be optimized. at light load condition, the fr9839a can operate at power saving mode to support high efficiency and reduce power loss.

the fr9839a fault protection includes cycle-by-cycle current limit, input uvlo, output over voltage protection and thermal shutdown. besides, 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 1.3μa.

the fr9839a is offered in sop-8 (exposed pad) package, which provides good thermal good thermal conductance.

• wide input voltage range: 3.5v to 40v
• 5a output current
• adjustable output voltage down to 0.75v
• 90mω high-side mosfet
• current mode control
• 200khz to 2.5mhz adjustable switching frequency
• 100μa operating quiescent current
• 1.3μa shutdown current
• externally adjustable soft-start or internal 0.6ms soft-start
• built-in spread-spectrum frequency modulation
• input under voltage lockout
• cycle-by-cycle current limit
• hiccup short circuit protection
• output over voltage protection
• over-temperature protection with auto recovery
• sop-8 (exposed pad) package