LTC3899IUHF#PBF

LINEAR TECHNOLOGY  LTC3899IUHF#PBF  直流/直流控制器, 电流模式, 4.5V至60V, 3路输出, 降压 / 降压-升压, 835kHz, QFN-38

The is a high-performance triple output buck/ buck/boost DC/DC Switching Regulator Controller that drives all N-channel synchronous power MOSFET stages. The constant frequency current-mode architecture allows a phase-lockable frequency of up to 850kHz. It operates from a wide 4.5 to 60V input supply range. When biased from the output of the boost converter or another auxiliary supply, it can operate from an input supply as low as 2.2V after start-up. The gate drive for the controller can be programmed from 5 to 10V to allow the use of logic-level or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes. The 29µA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.

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Dual BuckPlus single boost synchronous

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No external bootstrap diodes required

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3.6µA Low shutdown IQ

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Fixed or adjustable boost output voltage saves