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LT3991-3.3 Datasheet 1.2A Step-Down Regulator

Manufacturer: Linear Technology (now Analog Devices)

Download the LT3991-3.3 datasheet PDF. This datasheet also includes the LT3991 variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (LT3991_LinearTechnology.pdf) that lists specifications for multiple related part numbers.

General Description

The LT®3991 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.

Key Features

  • n Ultralow Quiescent Current: 2.8µA IQ Regulating 12VIN to 3.3VOUT n Fixed Output Voltages: 3.3V, 5V 2.1µA IQ Regulating 12VIN n Low Ripple Burst Mode® Operation: Output Ripple < 15mVP-P n Wide Input Voltage Range: 4.3V to 55V n 1.2A Maximum Output Current n Adjustable Switching Frequency: 200kHz to 2MHz n Synchronizable Between 250kHz to 2MHz n Fast Transient Response n Accurate 1V Enable Pin Threshold n Low Shutdown Current: IQ = 700nA n Power Good Flag n Soft-Start CapabilityV n.

More Datasheets from Linear Technology (now Analog Devices)

Part Number Description
LT3991-5 1.2A Step-Down Regulator
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