LT3498 - 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN

Features

  • Dual Output Boost for Dual Display Devices
  • Drives Up to Six White LEDs and OLED/LCD Bias
  • Internal Power Switches and Schottky Diodes
  • Independent Dimming and Shutdown
  • 200mV High Side Sense on LED Driver Allows "One-Wire Current Source"
  • Wide Input Voltage Range: 2.5V to 12V
  • Wide Output Voltage Range: Up to 32V
  • 2.3MHz PWM Frequency for LED Driver
  • PFM for OLED Driver is Non-Audible Over Entire Load Range
  • Open LED Protection (27V Maximum on CAP1 Pin)
  • OLED Output Disconnect
  • Available in 12-Pin DFN Package
  • 1mm Tall Solution Height

Typical Application

LT3498 Typical Application
LT3498 Typical Application

Description

The LT3498 is a dual output boost converter featuring a 2.3MHz PWM LED Driver and PFM OLED Driver. It includes an internal power switch and Schottky diode for each driver. Both converters can be independently shut down and modulated. This highly integrated power solution is ideal for dual display electronic devices.

The 2.3MHz step-up converter is designed to drive up to six white LEDs in series from a Li-Ion cell. The device features a unique high side LED current sense that enables the part to function as a “one-wire” current source—one side of the LED string can be returned to ground anywhere. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The PFM OLED driver is a low noise boost converter that features a novel control technique.* The converter controls power delivery by varying both the peak inductor current and switch off time. This technique results in low output voltage ripple, as well as, high efficiency over a wide load range. The off time of the switch is not allowed to exceed a fixed level, guaranteeing a switching frequency that stays above the audio band.

Packaging

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

DFN-12

LT3498 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3498EDDB#PBF DFN 12 E $2.79 View
LT3498EDDB#TRMPBF DFN 12 E $2.79 $2.00 View
LT3498EDDB#TRPBF DFN 12 E $2.79 $1.95 View
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
DC1137A LT3498EDDB Demo Board | 20mA LED Driver & OLED Driver w/ Integrated Schottky in 2x3 DFN. Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • Cellular Phones
  • PDAs, Handheld Computers
  • Digital Cameras
  • MP3 Players
  • GPS Receivers

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspiceIV

LTspice IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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 IV:
LT3498

Technical Support