LTC3638EMSE#PBF

LINEAR TECHNOLOGY  LTC3638EMSE#PBF  芯片, 直流/直流转换器, 降压, 0.25A, MSOP-16

The is a 140V 250mA step-down DC/DC Regulator with an internal high side power switch that draws only 12µA DC supply current while maintaining a regulated output voltage at no load. The LTC3638 can supply up to 250mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3638"s combination of Burst Mode® operation, integrated power switch, low quiescent current and programmable peak current limit provides high efficiency over a broad range of load currents. With its wide input range of 4 to 140V and programmable overvoltage lockout, the LTC3638 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3638 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment.

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Internal low resistance power MOSFET

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No compensation required

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Adjustable 20 to 250mA maximum output current

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Low dropout operation 100% duty cycle

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Low quiescent current 12µA

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Wide output range 0.8V to VIN

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0.8V ±1% Feedback voltage reference

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Precise RUN pin threshold

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Internal or external soft-start

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Programmable 1.8, 3.3, 5V or adjustable output

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Few external components required

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Programmable input overvoltage lockout