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
LT3473
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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.

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Packaging

DFN-8

LT3473
LT3473
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3473AEDE DFN 12 E $2.93 $2.05 View
LT3473AEDE#PBF DFN 12 E $2.93 $2.05 View
LT3473AEDE#TR DFN 12 E   $2.15 View
LT3473AEDE#TRPBF DFN 12 E   $2.15 View
LT3473EDD DFN 8 E $2.79 $1.95 View
LT3473EDD#PBF DFN 8 E $2.79 $1.95 View
LT3473EDD#TR DFN 8 E   $2.05 View
LT3473EDD#TRPBF DFN 8 E   $2.05 View
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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.

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Applications

  • OLED Bias
  • CCD Bias
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Simulate

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

  • Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III

  • Step 2. Once LTSpice is installed, click here for a ready to run  demonstration circuit of the LT3473.

  • Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, 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 demonstartion circuit by selecting "Open" from the "File" menu.
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