LT3475
LT3475-1
Info: : PRODUCTION
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LT3475
LT3475-1

Dual Step-Down 1.5A LED Driver

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Info: : PRODUCTION tooltip
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Part Details
Part Models 8
1ku List Price Starting From $4.19
Features
  • True Color PWM Delivers Constant Color with 3000:1 Dimming Range
  • Wide Input Range: 4V to 36V Operating, 40V Maximum
  • Accurate and Adjustable Control of LED Current from 50mA to 1.5A
  • High Side Current Sense Allows Grounded Cathode LED Operation
  • Open LED (LT3475) and Short Circuit Protection
  • LT3475-1 Drives LED Strings Up to 25V
  • Accurate and Adjustable 200kHz to 2MHz Switching Frequency
  • Anti-Phase Switching Reduces Ripple
  • Uses Small Inductors and Ceramic Capacitors
  • Available in the Compact 20-Lead TSSOP Thermally Enhanced Surface Mount Package
Additional Details
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The LT3475 is a dual step-down DC/DC converter designed to operate as a constant-current source. An internal sense resistor monitors the output current allowing accurate current regulation ideal for driving high current LEDs. The high side current sense allows grounded cathode LED operation. High output current accuracy is maintained over a wide current range, from 50mA to 1.5A, allowing a wide dimming range. Unique PWM circuitry allows a dimming range of 3000:1, avoiding the color shift normally associated with LED current dimming.

The high switching frequency offers several advantages, permitting the use of small inductors and ceramic capacitors. Small inductors combined with the LT3475's 20 lead TSSOP surface mount package save space and cost versus alternative solutions. The constant switching frequency combined with low-impedance ceramic capacitors result in low, predictable output ripple.

With its wide input range of 4V to 36V, the LT3475 regulates a broad array of power sources. A current mode PWM architecture provides fast transient response and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection.

Applications

  • Automotive and Avionic Lighting
  • Architectural Detail Lighting
  • Display Backlighting
  • Constant-Current Sources
Part Models 8
1ku List Price Starting From $4.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3475EFE#PBF

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LT3475EFE-1#PBF

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LT3475EFE-1#TRPBF

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LT3475IFE#PBF

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3475EFE#PBF

PRODUCTION

LT3475EFE#TRPBF

PRODUCTION

LT3475EFE-1#PBF

PRODUCTION

LT3475EFE-1#TRPBF

PRODUCTION

LT3475IFE#PBF

PRODUCTION

LT3475IFE#TRPBF

PRODUCTION

LT3475IFE-1#PBF

PRODUCTION

LT3475IFE-1#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC1315A

LT3475IFE-1 Demo Board | Dual Step-Down LED Driver, 4V ≤ VIN ≤ 36V, VOUT up to 13V @ 1.5A (x2)

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DC1315A

LT3475IFE-1 Demo Board | Dual Step-Down LED Driver, 4V ≤ VIN ≤ 36V, VOUT up to 13V @ 1.5A (x2)

LT3475IFE-1 Demo Board | Dual Step-Down LED Driver, 4V ≤ VIN ≤ 36V, VOUT up to 13V @ 1.5A (x2)

Product Detail

Demonstration circuit 1315 features the LT3475-1 dual step-down 1.5A LED driver in a 16-lead TSSOP thermally enhanced package. The demonstration circuit is designed to drive two 1.5A 4-LED strings (one on each channel) from an input voltage between 13V and 36V, but the start-up voltage is limited to 30V. The LT3475-1 operates from 4V to 36V so a lower input voltage can be applied with fewer LEDs. 

reference details image

DC923A

LT3475 Demo Board

Tools & Simulations

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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