LT3470A

PRODUCTION

LT3470A

Micropower Buck Regulator with Integrated Boost and Catch Diodes

PRODUCTION

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Part Models 12

1ku List Price Starting From $2.95

Features

Low Quiescent Current: 35µA at 12V_IN to 3.3V_OUT
Integrated Boost and Catch Diodes
Input Range: 4V to 40V
3.3V at 250mA from 4V to 40V Input
5V at 250mA from 5.7V to 40V Input
Low Output Ripple: <10mV
<1µA in Shutdown Mode
Output Voltage: 1.25V to 16V

Hysteretic Mode Control
- Low Ripple Burst Mode^® Operation at Light Loads
- Continuous Operation at Higher Loads
Solution Size as Small as 50mm²
Low Profile (0.75mm) 2mm × 3mm Thermally Enhanced 8-Lead DFN Package
AEC-Q100 Qualified for Automotive Applications

Additional Details

The LT3470A is a micropower step-down DC/DC converter that integrates a 440mA power switch, catch diode and boost diode into low profile 2mm × 3mm DFN package. The LT3470A combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 250mA.

With its wide input range of 4V to 40V, the LT3470A can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and lead-acid batteries. Quiescent current in regulation is just 35µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470A and external components against shorted outputs, even at 40V input. The LT3470A has higher output current and improved start-up and dropout performance compared to the LT3470.


	Vin Min Startup	Switch Current
LT3470	5.5V	300mA
LT3470A	4V	400mA

Applications

Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation

View All Documentation

Ask a Question

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

Other places you can find help

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 12

1ku List Price Starting From $2.95

Technical Documents 4

LT3470A: Micropower Buck Regulator with Integrated Boost and Catch Diodes Data Sheet (Rev.C) 01/10/2011

R303 Reliability Data 03/23/2018

SCP-LT3470A-BEVALZ - Demo Manual (Rev.0) 02/01/2021

DC1382A - Demo Manual 09/24/2009

Design Resources 12

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
LT3470AEDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AEDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AEDDB#WTRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AEDDB#WTRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AHDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AHDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AHDDB#WTRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AHDDB#WTRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AIDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AIDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AIDDB#WTRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3470AIDDB#WTRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3470AEDDB#TRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AEDDB#TRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AEDDB#WTRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AEDDB#WTRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AHDDB#TRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AHDDB#TRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AHDDB#WTRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AHDDB#WTRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AIDDB#TRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AIDDB#TRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AIDDB#WTRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3470AIDDB#WTRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Companion Parts 4

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High Voltage Hot Swap Controllers1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
PowerPath, Ideal Diodes, and Load Switches1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection

SCP-LT3470A-BEVALZ

LT3470A Signal Chain Evaluation Board | Micropower Buck Converter

LT3470A Signal Chain Evaluation Board - Top View

LT3470A Signal Chain Evaluation Board - Bottom View

LT3470A Signal Chain Evaluation Board | Micropower Buck Converter

Download

SCP-LT3470A-BEVALZ

LT3470A Signal Chain Evaluation Board | Micropower Buck Converter

Buy Now View Details

Product Detail

Demonstration circuit SCP-LT3470A-BEVALZ is a 40V micropower DFN buck regulator featuring the LT3470A. The board is optimized for 3.3V output at up to 250mA load current for a steady state input voltage range of 4V to 36V.

Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

SCP-INPUT-EVALZ
SCP-OUTPUT-EVALZ
SCP-1X5BKOUT-EVALZ
SCP-THRUBRD-EVALZ

SCP-FILTER-EVALZ
SCP-1X2BKOUT-EVALZ
SCP-5X1-EVALZ

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT3470A. Please refer to the LT3470A data sheet for a complete description of the part.

Resources

PDF

SCP-LT3470A-BEVALZ - Demo Manual (Rev.0)

1.93 M

PDF

SCP-LT3470A-BEVALZ - Schematic

76.75 K

ZIP

SCP-LT3470A-BEVALZ - Design Files

3.64 M

DC1382A

LT3470AEDDB Demo Board | (DFN) 4V ≤ VIN ≤ 36V, VOUT = 3.3V @ 250mA, Integrated Boost and Catch Diodes

DC1382A

LT3470AEDDB Demo Board | (DFN) 4V ≤ VIN ≤ 36V, VOUT = 3.3V @ 250mA, Integrated Boost and Catch Diodes

Buy Now View Details

Product Detail

Demonstration circuit 1382 is a 40V micropower DFN buck regulator featuring the LT3470A. The LT3470A has a higher peak switch current and improved start-up and dropout compared with the non-"A" version. The demo board is optimized for 3.3V output at up to 250mA load current for a steady state input voltage range of 4V to 36V. With its wide input voltage range, high efficiency internal power switch, extremely low dropout operation, hysteretic current-mode, integrated boost and catch diodes and tiny DFN package, the LT3470A is a very versatile and powerful IC for DC/DC converters that require extremely compact space, high efficiency and high input voltage.

Resources

PDF

DC1382A - Demo Manual

735.00K

PDF

DC1382A - Schematic

28.00K

ZIP

DC1382A - Design File

548.00K

SCP-LT3470A-BEVALZ

LT3470A Signal Chain Evaluation Board | Micropower Buck Converter

DC1382A

LT3470AEDDB Demo Board | (DFN) 4V ≤ VIN ≤ 36V, VOUT = 3.3V @ 250mA, Integrated Boost and Catch Diodes

LTspice 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.