LTC3642EMS8E-3.3#PBF

LINEAR TECHNOLOGY  LTC3642EMS8E-3.3#PBF  同步降压开关稳压器, 固定, 4.5V-45V输入, 3.3V和50mA输出, MSOP-8

The is a step-down DC/DC Converter with internal high side and synchronous power switches that draws only 12µA typical DC supply current at no load while maintaining output voltage regulation. It can supply up to 50mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency in lower current applications. The LTC3642"s combination of Burst Mode® operation, integrated power switches, low quiescent current and programmable peak current limit provides high efficiency over a broad range of load currents. With its wide 4.5 to 45V input range and internal overvoltage monitor capable of protecting the part through 60V surges, it is a robust converter suited for regulating a wide variety of power sources. Additionally, it 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 high side and low side power switches

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No compensation required

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100% Duty cycle low dropout operation

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12µA Low quiescent current

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Adjustable peak current limit

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Internal and external soft-start

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Precise RUN Pin Threshold with Adjustable Hysteresis

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Only three external components required for fixed output versions