LT3498

PRODUCTION

LT3498

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

PRODUCTION

Li-Ion to Six White LEDs and OLED/LCD Bias slide

Li-Ion to Six White LEDs and OLED/LCD Bias

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $2.14

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

Additional Details

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.

Applications

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

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $2.14

Technical Documents 3

R518 Reliability Data 03/26/2018

DC1137A - Demo Manual 09/24/2009

White LED Driver and OLED Driver with Integrated Schottkys and Output Disconnect in 3mm × 2mm DFN 10/01/2007

Design Resources 2

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3498EDDB#TRMPBF	12-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3498EDDB#TRPBF	12-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3498EDDB#TRMPBF
Pin/Package Drawing
12-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3498EDDB#TRPBF
Pin/Package Drawing
12-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

DC1137A

LT3498EDDB Demo Board | Boost LED Driver and OLED Driver, 3V ≤ VIN ≤ 5.25V, VLED up to 26V @ 20mA (×6)

DC1137A

LT3498EDDB Demo Board | Boost LED Driver and OLED Driver, 3V ≤ VIN ≤ 5.25V, VLED up to 26V @ 20mA (×6)

Buy Now View Details

Product Detail

Demonstration circuit 1137 is a 20mA Six White LED Driver and OLED driver with Integrated Schottky featuring the LT3498. The LT3498 is a dual output boost converter featuring a 2.3MHz PWM LED driver and a PFM (Pulse Frequency Modulation) OLED driver. The demo board is designed to operate from 3V to 5V, ideal for Li Ion battery powered dual display applications, such as main and sub-displays for cell phones.

The demo board offers flexible LED dimming methods. Users can use DC dimming, filtered PWM dimming or direct PWM dimming. The parts functions as a “one-wire” current source from the LED string point of view. The circuit protection clamps LED driver output to 27V (typ) if an open circuit condition occurs. When CTRL2 is higher than 1.5V, the demo board OLED supply output voltage is 16V. It can deliver up to 24mA from a 3V source.

Resources

ZIP

DC1137A - Design File

589.00K

PDF

DC1137A - Schematic

25.00K

PDF

DC1137A - Demo Manual

235.00K

DC1137A

LT3498EDDB Demo Board | Boost LED Driver and OLED Driver, 3V ≤ VIN ≤ 5.25V, VLED up to 26V @ 20mA (×6)

LTspice 2

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.