LTC3406-1.8

PRODUCTION

LTC3406-1.8

1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

PRODUCTION

Part Details

Figure 1a. High Efficiency Step-Down Converter slide

Figure 1b. Efficiency vs Load Current slide

Figure 1a. High Efficiency Step-Down Converter

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Part Models 2

1ku List Price Starting From $2.63

Features

High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20µA During Operation
600mA Output Current
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws </=1µA Supply Current
Current Mode Operation for Excellent Line and Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT^™ Package

Additional Details

The LTC3406 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current during operation is only 20µA and drops to <=1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode^® operation increases efficiency at light loads, further extending battery life.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3406 is available in a low profile (1mm) ThinSOT package.

Protected by U.S. Patents, including 6580258, 5481178.


	Vout	Fsw	Features
LTC3406	Adj.	1.5MHz	Burst Mode
LTC3406-1.2	1.2V	1.5MHz	Burst Mode
LTC3406-1.5	1.5V	1.5MHz	Burst Mode
LTC3406-1.8	1.8V	1.5MHz	Burst Mode
LTC3406B	Adj.	1.5MHz	Burst Mode Disabled
LTC3406B-1.2	1.2V	1.5MHz	Burst Mode Disabled
LTC3406B-2	Adj.	2.25MHz	Burst Mode Disabled
LTC3406A	Adj.	1.5MHz	Low Ripple Burst Mode
LTC3406AB	Adj.	1.5MHz	Burst Mode Disabled
LTC3406AB-2	Adj.	2.25MHz	Burst Mode Disabled

Applications

Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $2.63

Documentation

Technical Documents 5

LTC3406 LTC3406-1.5/LTC3406-1.8: 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT Data Sheet 10/02/2017

R415 Reliability Data 03/23/2018

DC500A - Demo Manual 09/24/2009

DN1008 - Simple, Efficient, All-in-One USB Power Management IC Solution 11/16/2007

Design Note 1008: Simple, Efficient, All-in-One USB Power Management IC Solution 11/03/2022

Reference Materials 1

Aug 2002 Monolithic Synchronous Step-Down Regulators Pack 600mA Current Rating in a ThinSOT Package 08/09/2004

Design Resources 2

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3406ES5-1.8#TRMPBF	5-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3406ES5-1.8#TRPBF	5-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3406ES5-1.8#TRMPBF
Pin/Package Drawing
5-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3406ES5-1.8#TRPBF
Pin/Package Drawing
5-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Software & Part Ecosystem

Companion Parts 4

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LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Single-Supply Monitors1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Surge Stopper, Overvoltage, and Overcurrent Protection1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Evaluation Kit

DC500A-C

LTC3406ES5-1.8 Demo Board | 2.7V to 5.5VIN, 1.8VOUT @ 600mA(Max)

DC500A-C

LTC3406ES5-1.8 Demo Board | 2.7V to 5.5VIN, 1.8VOUT @ 600mA(Max)

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Product Detail

Demonstration circuit DC500 is a constant-frequency step-down converter, using the various versions (fixed output/adjustable output/Burst Mode/Burst Mode defeated) of the LTC3406 or LTC3406B monolithic synchronous buck regulators. The DC500 has an input voltage range of 2.7V to 5.5V, and is capable of delivering up to 600 mA of output current at minimum input voltage of 3V. The DC500A-C features the 1.8V fixed output, Burst Mode-capable LTC3406-1.8.

Resources

PDF

DC500A - Demo Manual

60.00K

PDF

DC500A - Schematic

13.00K

ZIP

DC500A - Design File

1.00M

DC500A-C

LTC3406ES5-1.8 Demo Board | 2.7V to 5.5VIN, 1.8VOUT @ 600mA(Max)

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Models for the following parts are available in LTspice:

LTC3406

LTC3406-1.2

LTC3406-1.5

LTC3406-1.8

LTC3406A

LTC3406AB

LTC3406B

LTC3406B-1.2

LTC3406B-1.5

LTC3406B-1.8

LTC3406B-2

LTpowerCAD 1

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation