LT3991EMSE-5#PBF

开关稳压器 55V, 1.2A, 2MHz Step-Down Regulator with 2.8uA Quiescent Current

The is an adjustable frequency monolithic buck Switching Regulator that accepts a wide input voltage range up to 55V. Low quiescent current design consumes only 2.8µA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 0.44R switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. An accurate 1V threshold enable pin can be used to shut down the LT3991, reducing the input supply current to 700nA. A capacitor on the SS pin provides a controlled inrush current soft-start. A power good flag signals when VOUT reaches 91% of the programmed output voltage.

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Ultralow quiescent current

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Low ripple Burst Mode® operation

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Adjustable switching frequency

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Fast transient response

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Power good flag

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Soft-start capability

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Internal compensation

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700nA Low shutdown current