LT3486 - Dual 1.3A White LED Step-Up Converters with Wide Dimming

Features

  • 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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3486 Typical Application
LT3486 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3486EDHC#PBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LT3486EDHC#TRPBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LT3486EFE#PBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LT3486EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LT3486IFE#PBF TSSOP-16 FE I 05-08-1663 (BC) Yes
LT3486IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BC) Yes


LT3486 Package Drawing
LT3486 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3486EDHC#PBF 5x3 DFN-16 E $3.57 $2.50 Yes
LT3486EDHC#TRPBF 5x3 DFN-16 E $2.60 Yes
LT3486EFE#PBF TSSOP-16 E $3.71 $2.60 Yes
LT3486EFE#TRPBF TSSOP-16 E $2.72 Yes
LT3486IFE#PBF TSSOP-16 I $4.46 $3.12 Yes
LT3486IFE#TRPBF TSSOP-16 I $3.18 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC876A LT3486EFE Demo Board | Dual Boost LED Driver, 3V ≤ VIN ≤ 25V, VLED up to 36V @ 100mA (x2) $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3486IFE#PBF TSSOP-16 I $4.46 $3.12 Yes
LT3486IFE#TRPBF TSSOP-16 I $3.18 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Notebook PC Display
  • LED Camera Light for Cell Phones
  • Car Dashboard Lighting
  • Avionics Displays

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
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Models for the following parts are available in LTspice:
LT3486

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