Products
LT3475
LT3475-1
PRODUCTION
Dual Step-Down 1.5A LED Driver
- Part Models
- 8
- 1ku List Price
- Starting From $4.82
Viewing:
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 2
Design Note 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3475EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3475EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3475EFE-1#PBF | 20-Lead TSSOP w/ EP | ||
| LT3475EFE-1#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3475IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3475IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3475IFE-1#PBF | 20-Lead TSSOP w/ EP | ||
| LT3475IFE-1#TRPBF | 20-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 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 | |
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3475EFE-1#PBF | PRODUCTION | |
| LT3475EFE-1#TRPBF | PRODUCTION | |
| LT3475IFE-1#PBF | PRODUCTION | |
| LT3475IFE-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
Tools & Simulations
LTspice 2
- LT3475-1 Demo Circuit - 1.5A Dual Step-Down LED Driver (32V to 2 Strings of 4x 3.4V LED @ 1.5A)
- LT3475 Demo Circuit - Dual 1.5A, Step-Down LED Driver (12V to 3.4V LED @ 1.5A)
Models for the following parts are available in LTspice:
- LT3475
- LT3475-1
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.
