LT3497
Info: : PRODUCTION
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LT3497

Dual Full Function White LED Driver with Integrated Schottky Diodes

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 2
1ku List Price Starting From $2.07
Features
  • Drives Up to 12 White LEDs (6 in Series per Converter) from a 3V Supply
  • Two Independent Boost Converters Capable of Driving Asymmetric LED Strings
  • Independent Dimming and Shutdown Control of the Two LED Strings
  • High Side Sense Allows “One Wire Current Source” per Converter
  • Internal Schottky Diodes
  • Open LED Protection (32V)
  • 2.3MHz Switching Frequency
  • ±5% Reference Accuracy
  • VIN Range: 2.5V to 10V
  • Dual Wide 250:1 True Color PWM Dimming
  • Requires Only 1µF Output Capacitor per Converter
  • Available in a 3mm × 2mm 10-Pin DFN Package
Additional Details
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The LT3497 is a dual full function step-up DC/DC converter specifically designed to drive up to 12 white LEDs (6 white LEDs in series per converter) from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration.

The two independent converters are capable of driving asymmetric LED strings. Accurate LED dimming and shutdown of the two LED strings can also be controlled independently. The LT3497 features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler 1-wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The 2.3MHz switching frequency allows the use of tiny inductors and capacitors. Few external components are needed for the dual white LED Driver: open-LED protection and the Schottky diodes are all contained inside the 3mm × 2mm DFN package. With such a high level of integration, the LT3497 provides a high efficiency dual white LED driver solution in the smallest of spaces.

Applications

  • Cellular Phones
  • PDAs, Handheld Computers
  • Digital Cameras
  • MP3 Players
  • GPS Receivers
Part Models 2
1ku List Price Starting From $2.07

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3497EDDB#TRMPBF
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LT3497EDDB#TRPBF
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Software & Part Ecosystem

Tools & Simulations 1

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.

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.

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