LTC3859EUHF#PBF

LINEAR TECHNOLOGY  LTC3859EUHF#PBF  直流/直流控制器, 4.5V至38V, 3路输出, 同步降压/ 降压-升压, 585kHz, QFN-38

The is a high-performance triple output buck/ buck/boost synchronous DC/DC Switching Regulator Controller drives all N-channel power MOSFET stages. Constant frequency current-mode architecture allows a phase-lockable switching frequency of up to 850kHz. It operates from a wide 4.5 to 38V input supply range. When biased from the output of the boost converter or another auxiliary supply, the controller can operate from an input supply as low as 2.5V after start-up. The 55µA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. It features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

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Dual buck plus single boost synchronous controllers

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Boost output voltage up to 60V

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RSENSE or DCR current sensing

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Selectable continuous, pulse-skipping or low ripple burst mode operation at light loads

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Adjustable output voltage soft-start or tracking