LT3476
LT3476
PRODUCTIONHigh Current Quad Output LED Driver
- Part Models
- 4
- 1ku List Price
- Starting From $7.00
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Overview
- True Color PWM™ Dimming Delivers Up to 5000:1 Dimming Ratio (In Boost Configuration)
- LED Current Regulation with High-Side Sense
- VADJ Pin Accurately Sets LED Current Sense Threshold Over Range 10mV to 120mV
- Four Independent Driver Channels with 1.5A, 36V Internal NPN Switches
- Frequency Adjust Pin: 200kHz to 2MHz
- High Efficiency Conversion = Up to 96%
- Open LED Protection
- Low Shutdown Current < 10μA
- Wide VIN Range: 2.8V to 16V
- Thermally Enhanced, 38-Lead, 5mm × 7mm QFN Package
The LT3476 is a quad output DC/DC converter designed to operate as a constant-current source for driving high current LEDs. A fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 200kHz and 2MHz to optimize efficiency and external component size.
The LT3476 senses output current at the high side of the LED. High side current sensing is the most flexible scheme for driving LEDs, allowing buck, boost or buckboost configurations. Each current monitor threshold is trimmed to within 2.5% at the full scale of 105mV. With an external sense resistor, the user programs the output current range of each channel. Each of the four regulators is independently operated by that channel’s PWM signal. This PWM feature allows precise adjustment of the color mixing or dimming ratio of the LED source. Dimming ratios up to 1000:1 can be achieved.
Applications
- RGGB Lighting
- Automotive and Avionic Lighting
- TFT LCD Backlighting
- Constant-Current Sources
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 |
|---|---|---|---|
| LT3476EUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3476EUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3476IUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3476IUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3476
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.
Evaluation Kits
LT3476EUHF Demo Board | Quad Buck Mode LED Driver, PVIN ≤ 33V, Up to 27VLED @ 350mA or 1.05A