LTC3857EUH#PBF

LINEAR TECHNOLOGY  LTC3857EUH#PBF  直流/直流控制器, 高性能, 2相, 4V至38V, 2路输出, 降压, 585kHz, QFN-32

The is a high-performance dual step-down Switching Regulator Controller drives all N-channel synchronous power MOSFET stages. The constant frequency current-mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase. The 50µA no-load quiescent current extends operating run time in battery-powered systems. It features a precision 0.8V reference and power good output indicators. A wide 4 to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among burst mode operation, pulse-skipping mode, or continuous inductor current-mode at light loads.

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Out-of-phase controllers reduce required input capacitance and power supply induced noise

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OPTI-LOOP® Compensation minimizes COUT

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Selectable current limit

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Adjustable output voltage soft-start or tracking

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Power good output voltage monitors

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Output overvoltage protection

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No current foldback during start-up