Overview
Features and Benefits
- Wide (1000:1) PWM Dimming Range with No ColorShift
- Independent Dimming and Shutdown Control of the LED Drivers
- Drives Up to 16 White LEDs at 25mA (8 per Driver) from a Single Li-Ion Cell
- Drives Up to 16 White LEDs at 100mA (8 per Driver) from 12V Supply
- ±3% LED Current Programming Accuracy
- Open LED Protection: 36V Clamp Voltage
- Fixed Frequency Operation: Up to 2.5MHz
- Wide Input Voltage Range: 2.5V to 24V
- Low Shutdown Current: ICC < 1μA
- Overtemperature Protection
- Available in (5mm × 3mm × 0.75mm) 16-Pin DFN and 16-Pin Thermally Enhanced TSSOP Packages
Product Details
The LT3486 is a dual step-up DC/DC converter specifically designed to drive up to 16 White LEDs (8 in series per converter) at constant current from a single Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness. The two independent converters are capable of driving asymmetric LED strings.
The dimming of the two LED strings can be controlled independently via the respective CTRL pins. An internal dimming system allows the dimming range to be extended up to 1000:1 by feeding a PWM signal to the respective PWM pins. The LT3486 operating frequency can be set with an external resistor over a 200kHz to 2.5MHz range. A low 200mV feedback voltage (±3% accuracy) minimizes power loss in the current setting resistor for better efficiency. Additional features include output voltage limiting when LEDs are disconnected and overtemperature protection.
The LT3486 is available in a space saving 16-pin DFN (5mm × 3mm × 0.75mm) and 16-pin thermally enhanced TSSOP packages.
Applications
- Notebook PC Display
- LED Camera Light for Cell Phones
- Car Dashboard Lighting
- Avionics Displays
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
R458 Reliability Data3/22/2018PDF31 K
-
DC876A - Demo Manual9/24/2009PDF554K
-
Dual Step-Up Converter Drives White LEDs with 1000:1 PWM Dimming6/1/2006 LT Journal
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LT3486
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT3486EDHC#PBF | Material Declaration | Reliability Data | 16-Lead DFN (5mm x 3mm w/ EP) | |
| LT3486EDHC#TRPBF | Material Declaration | Reliability Data | 16-Lead DFN (5mm x 3mm w/ EP) | |
| LT3486EFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3486EFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3486IFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT3486IFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| Wafer Fabrication Data | R458 Reliability Data |
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Support & Discussions
Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.