LTC3708EUH#PBF

LINEAR TECHNOLOGY  LTC3708EUH#PBF  直流/直流控制器, 2相, 4.5V至36V, 2路输出, 同步降压, QFN-32

The is a 2-phase dual synchronous step-down Switching Regulator with output voltage up/down tracking capability. The IC allows either coincident or ratiometric tracking. Multiple LTC3708s can be daisy-chained in applications requiring more than two voltages to be tracked. Power supply sequencing is accomplished using an external soft-start timing capacitor. The LTC3708 uses a constant on-time, valley current-mode control architecture to deliver very low duty factors without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock. Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The regulator current limit level is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to 0.6V output.

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Very fast transient response

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Programmable output voltage up/down tracking

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2-phase operation reduces input capacitance

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0.6V ±1% Output voltage reference

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External frequency synchronization

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Monotonic soft-start

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Onboard high current MOSFET drivers

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Adjustable cycle-by-cycle current limit

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Instant output overvoltage protection

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Optional short-circuit shutdown timer

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Power good output with 100µs Masking