Data Sheet
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Overview

Features and Benefits

  • High Output Voltage: Up to 90V
  • Integrated Schottky Diodes
  • 48V, 280mA Internal Switch
  • High Side APD Current Monitor
  • Adjustable Switching Frequency: 650kHz or 1.1MHz
  • Wide VIN Range: 2.5V to 16V
  • Surface Mount Components
  • Low Shutdown Current: <1µA
  • Soft-Start
  • Internal Compensation
  • CTRL Pin Allows Output Adjustment with No Polarity Inversion
  • 3mm × 3mm 16-Lead QFN Package

Product Details

The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD bias current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD bias current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to APD bias current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250nA to 2.5mA. This APD bias current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package.

Applications

  • APD Bias
  • PIN Diode Bias
  • Optical Receivers and Modules
  • Fiber Optic Network Equipment

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Documentation & Resources

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  • Data Sheets (1)
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    Tools & Simulations

    LTspice

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    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.

    LTspice

    LTspice Simulations

    LT3482 Demo Circuit - 90V Boost DC/DC Converter for APD Bias (5V to 85V @ 2.5mA)

    Models for the following parts are available in LTspice:

    LT3482

    Design Resources

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    LT3482 Material Declaration
    Quality And Reliability
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    Support & Discussions

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