Power Management Switching Regulator LCD/CCD/OLED Bias
Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost
 Power Management Switching Regulator Step-Up (Boost) Regulators Multiple Output Boost
 Power Management LED Driver ICs Step-Up (Boost) LED Drivers

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

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
LT3498EDDB#PBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LT3498EDDB#TRMPBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LT3498EDDB#TRPBF 3x2 DFN-12 DDB E 05-08-1723 Yes


LT3498 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
LT3498EDDB#PBF 3x2 DFN-12 E $2.79 Yes
LT3498EDDB#TRMPBF 3x2 DFN-12 E $2.79 $2.00 Yes
LT3498EDDB#TRPBF 3x2 DFN-12 E $2.79 $1.95 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
DC1137A LT3498EDDB Demo Board | Boost LED Driver & OLED Driver, 3V ≤ VIN ≤ 5.25V, VLED up to 26V @ 20mA (x6) Contact Factory
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Click here to view our complete list of demo boards

Applications

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

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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

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LT3498

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