LT3470A - Micropower Buck Regulator with Integrated Boost and Catch Diodes

Features

  • Low Quiescent Current: 35μA at 12VIN to 3.3VOUT
  • 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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3470A Typical Application
LT3470A Typical Application

Description

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

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3470AEDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3470AEDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3470AEDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3470AHDDB#TRMPBF 3x2 DFN-8 DDB H 05-08-1702 Yes
LT3470AHDDB#TRPBF 3x2 DFN-8 DDB H 05-08-1702 Yes
LT3470AIDDB#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LT3470AIDDB#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LT3470AIDDB#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes


LT3470A Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3470AEDDB#PBF 3x2 DFN-8 E $3.51 Yes
LT3470AEDDB#TRMPBF 3x2 DFN-8 E $3.51 $2.51 Yes
LT3470AEDDB#TRPBF 3x2 DFN-8 E $3.51 $2.46 Yes
LT3470AHDDB#TRMPBF 3x2 DFN-8 H $4.49 $3.22 Yes
LT3470AHDDB#TRPBF 3x2 DFN-8 H $4.49 $3.17 Yes
LT3470AIDDB#PBF 3x2 DFN-8 I $4.04 Yes
LT3470AIDDB#TRMPBF 3x2 DFN-8 I $4.04 $2.98 Yes
LT3470AIDDB#TRPBF 3x2 DFN-8 I $4.04 $2.92 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1382A LT3470AEDDB Demo Board | (DFN) 4V ≤ VIN ≤ 36V, Vout = 3.3V @ 250mA, Integrated Boost & Catch Diodes $75.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3470AHDDB#TRMPBF 3x2 DFN-8 H $4.49 $3.22 Yes
LT3470AHDDB#TRPBF 3x2 DFN-8 H $4.49 $3.17 Yes
LT3470AIDDB#PBF 3x2 DFN-8 I $4.04 Yes
LT3470AIDDB#TRMPBF 3x2 DFN-8 I $4.04 $2.98 Yes
LT3470AIDDB#TRPBF 3x2 DFN-8 I $4.04 $2.92 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

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

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3470
LT3470A

Technical Support