LT3475/LT3475-1 - Dual Step-Down 1.5A LED Driver
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.
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
Typical Application
 | Applications- Automotive and Avionic Lighting
- Architectural Detail Lighting
- Display Backlighting
- Constant-Current Sources
Packaging |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|
| LT3475EFE-1#PBF | TSSOP-20 | E | $5.00 | $3.50 |
| LT3475EFE-1#TRPBF | TSSOP-20 | E | | $3.56 |
| LT3475EFE#PBF | TSSOP-20 | E | $5.00 | $3.50 |
| LT3475EFE#TRPBF | TSSOP-20 | E | | $3.56 |
| LT3475IFE-1#PBF | TSSOP-20 | I | $6.00 | $4.20 |
| LT3475IFE-1#TRPBF | TSSOP-20 | I | | $4.26 |
| LT3475IFE#PBF | TSSOP-20 | I | $6.00 | $4.20 |
| LT3475IFE#TRPBF | TSSOP-20 | I | | $4.26 |
Demo Boards
| Part Number | Description | Price |
|---|
| DC1315A | LT3475IFE-1Demo Board | Dual Step-Down LED Driver, 4V ≤ VIN ≤ 36V, Vout up to 13V @ 1.5A (x2) | $100.00 |
| DC923A | LT3475 Demo board | $100.00 |
DatasheetDesign NoteReliability DataPress ReleaseLTspice | Related Product |
