LT3466-1 - White LED Driver and Boost Converter in 3mm x 3mm DFN Package

Features

  • Drives Up to 10 White LEDs from a 3.6V Supply
  • Two Independent Step-Up DC/DC Converters
  • Independent Dimming and Shutdown Control of the Outputs
  • ±1.5% Output Voltage Accuracy (Boost Converter)
  • ±4% LED Current Programming Accuracy
  • Internal Schottky Diodes
  • Internal Soft-Start Eliminates Inrush Current
  • Output Overvoltage Protection (39.5V Max VOUT)
  • Fixed Frequency Operation Up to 2MHz
  • 83% Efficiency Driving 8 White LEDs at 15mA from a 3.6V Supply
  • Wide Input Voltage Range: 2.7V to 24V
  • Tiny (3mm × 3mm) 10-Lead DFN Package

Typical Application

LT3466-1 Typical Application
LT3466-1 Typical Application

Description

LT3466-1 is a dual switching regulator that combines a white LED driver and a boost converter in a low profile, small footprint (3mm × 3mm × 0.75mm) DFN package. The LED driver can be configured to drive up to 10 White LEDs in series and the boost converter can be used for generating the LCD bias voltages or driving a secondary OLED display. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration.

The LT3466-1 provides independent dimming and shutdown control of the two converters. The operating frequency can be set with an external resistor over a 200kHz to 2MHz range. The white LED driver features a low 200mV reference, thereby minimizing power loss in the current setting resistor for better efficiency. The boost converter achieves ±1.5% output voltage accuracy by the use of a precision 0.8V reference. Protection features include output overvoltage protection and internal soft-start. Wide input supply range allows operation from 2.7V to 24V.

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
LT3466EDD-1#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT3466EDD-1#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes


LT3466-1 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
LT3466EDD-1#PBF 3x3 DFN-10 E $2.79 $1.95 Yes
LT3466EDD-1#TRPBF 3x3 DFN-10 E $2.05 Yes
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* 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
DC915A LT3466EDD-1 Demo Board | Boost LED Driver Plus LCD Bias Supply, 2.7V ≤ VIN ≤ 14V, VLED up to 34V @ 15mA, VLCD Bias = ±15V @ 10mA $100.00
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Click here to view our complete list of demo boards

Applications

  • White LED and OLED Displays
  • Digital Cameras, Sub-Notebook PCs PDAs, Handheld Computers
  • TFT - LCD Bias Supply
  • Automotive

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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
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3466
LT3466-1

Technical Support