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LT3991-5 - 1.2A Step-Down Regulator

Download the LT3991-5 datasheet PDF. This datasheet also covers the LT3991 variant, as both devices belong to the same 1.2a step-down regulator family and are provided as variant models within a single manufacturer datasheet.

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.

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.

📥 Download Datasheet

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

📁 Similar Datasheet

Part Number Description Manufacturer
LT3991 1.2A Step-Down Regulator Linear Technology
LT3990 350mA Step-Down Regulator Linear Technology
LT3990 350mA Step-Down Regulator Analog Devices
LT3990-3.3 350mA Step-Down Regulator Analog Devices
LT3990-5 350mA Step-Down Regulator Analog Devices

Other Datasheets by Linear Technology (Analog Devices)

Part Number Description
LT3991-3.3 1.2A Step-Down Regulator
LT3990-3.3 350mA Step-Down Regulator
LT3990-5 350mA Step-Down Regulator
LT3999 1MHz Push-Pull DC/DC Driver
LT3922 2A Synchronous Step-Up LED Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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 Internal Compensation n Saturating Switch Design: 0.44Ω On-Resistance n Output Voltage: 1.
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