Linear Technology LT3685 36V 2A Step-Down Switching Regulator Datasheet

This datasheet details the LT3685, a 36V, 2A, 2.4MHz adjustable frequency monolithic step-down switching regulator with integrated boost diode and soft-start.

Brand: Linear Technology
Category: Power Management
Document type: Datasheet
Language: English
Pages: 24
File format: PDF
File size: 276 KB
Published: 13 October, 2026
Updated: 13 October, 2026
Model: LT3685
MD5 checksum: 8DE17E18C0600EFC7D4B2552A10E6C37
PDF: Linear Technology LT3685 36V 2A Step-Down Switching Regulator Datasheet PDF

About this manual

The LT3685 is an adjustable frequency (200kHz to 2.4MHz) monolithic step-down switching regulator that accepts input voltages up to 38V operating and 60V maximum. It features an internal overvoltage protection circuit, a high efficiency 0.25 switch, and a boost Schottky diode. The device uses current mode topology for fast transient response and good loop stability.

What's inside

Typical Application
Features
Pin Configuration
Absolute Maximum Ratings
Order Information
Electrical Characteristics
Typical Performance Characteristics
Pin Functions
Block Diagram

Specifications

Maximum Input Voltage	38V operating, 60V maximum
Maximum Output Current	2A
Switching Frequency Range	200kHz to 2.4MHz
Feedback Reference Voltage	0.790V
Shutdown Current	Less than 1μA
Switch On-Resistance	0.25Ω
Package Types	10-Pin MSOP and 3mm × 3mm DFN

Frequently asked questions

What is the minimum input voltage for the LT3685?

The minimum input voltage is 3.6V.

Does the LT3685 include an integrated boost diode?

Yes, it includes an integrated boost Schottky diode.

What is the output voltage range?

The output voltage range is from 0.79V to 20V.

Does the device have a power good flag?

Yes, a power good flag signals when V OUT reaches 89% of the programmed output voltage.

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