LT3473

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Micropower 1A Boost Converter with Schottky and Output Disconnect

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Overview

  • 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)

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.

Applications

  • OLED Bias
  • CCD Bias
LT3473
Micropower 1A Boost Converter with Schottky and Output Disconnect
Conversion Efficiency and Power Loss vs Output Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3473
  • LT3473A
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.

Evaluation Kits

eval board
schematic 1
DC883A

LT3473EDD | Li-Ion to 25V Step-Up DC/DC Converter, 3V to 4.2VIN, 25VOUT @ 80mA

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Product Details

Demonstration circuit DC883 features the LT3473 micropower step-up DC/DC converters with integrated Schottky diode and output disconnect circuitry. The output on DC883 is 25V at up to 80mA from a 3~4.2V input, while automatic Burst Mode operation maintains efficiency at light load. The lithium ion battery input voltage range, high output voltage, internal NPN power switch, minimal external components and simple design make the LT3473 an excellent solution for OLED and CCD Bias.
DC883A
LT3473EDD | Li-Ion to 25V Step-Up DC/DC Converter, 3V to 4.2VIN, 25VOUT @ 80mA
DC883A - Schematic

Latest Discussions

3 Years Ago
How do I calculate the maximum inductor current when using the LT3473?
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