LT3473 - Micropower 1A Boost Converter with Schottky and Output Disconnect

Features

  • Tiny Solution Size
  • Low Quiescent Current:
  • 150µA in Active Mode
    (VIN = 3.6V, VOUT = 15V, No Load)
    1µA in Shutdown Mode
  • Internal 1A, 36V Switch
  • Integrated Schottky Diode
  • Integrated PNP Output Disconnect
  • Internal Reference Override Pin
  • PGOOD Pin
  • 25V at 80mA from 3.6V Input
  • Auxiliary NPNs for Intermediate Bias Voltages (LT3473A)
  • Automatic Burst Mode® Operation at Light Load
  • Constant Switching Frequency: 1.2MHz
  • Thermal Shutdown
  • Input Range: 2.2V to 16V
  • Low Profile (3mm × 3mm) DFN Package (LT3473)
  • Low Profile (4mm × 3mm) DFN Package (LT3473A)

Typical Application

LT3473 Typical Application
LT3473 Typical Application

Description

The LT3473/LT3473A are micropower step-up DC/DC converters with integrated Schottky diode and output disconnect circuitry in low profile DFN packages. The small package size, high level of integration and the use of tiny SMT components yield a solution size of less than 50mm2. The internal 1A switch allows the device to deliver 25V at up to 80mA from a Li-Ion cell, while automatic Burst Mode operation maintains efficiency at light load. An auxiliary reference input (CTRL) allows the user to override the internal 1.25V feedback reference with any lower value, allowing full control of the output voltage during operation. A PGOOD pin sinks current when the output voltage reaches 90% of final value.

The LT3473A includes two NPN transistors for generating intermediate bias voltages from the output and is offered in a 12-lead (4mm × 3mm) DFN package. The LT3473 does not include these NPNs and is offered in an 8-lead (3mm × 3mm) package.

The rugged 36V switch and output disconnect circuitry allow outputs up to 34V to be easily generated in a simple boost topology.

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
LT3473AEDE#PBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LT3473AEDE#TRPBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LT3473EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT3473EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes


LT3473 Package Drawing
LT3473 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
LT3473AEDE#PBF 4x3 DFN-12 E $2.93 $2.05 Yes
LT3473AEDE#TRPBF 4x3 DFN-12 E $2.15 Yes
LT3473EDD#PBF 3x3 DFN-8 E $2.79 $1.95 Yes
LT3473EDD#TRPBF 3x3 DFN-8 E $2.05 Yes
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* 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
DC883A LT3473EDD | Li-Ion to 25V Step-Up DC/DC Converter, 3V to 4.2Vin, 25Vout @ 80mA $100.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • OLED Bias
  • CCD Bias

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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:
LT3473
LT3473A

Technical Support