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Product details

Parameters

Channels (#) 2 Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Switching frequency (Max) (kHz) 1250 Product type Inductive LED current per channel (mA) 30 Shutdown current (Typ) (uA) 3.6 Topology Boost Peak efficiency (%) 88 Features I2C Control Operating temperature range (C) -40 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

WSON (DSC) 10 9 mm² 3 x 3 open-in-new Find other Backlight LED drivers

Features

  • Integrated OLED Display Power Supply and LED Driver
  • Drives up to 10 LED’s at 30mA
  • Drives up to 5 LED’s at 20mA and Delivers up to 21V at 40mA
  • Over 90% Efficient
  • 32 Exponential Dimming Steps
  • 0.15% Accurate Current Matching Between Strings
  • Internal Soft-Start Limits Inrush Current
  • True Shutdown Isolation for LED’s
  • Wide 2.7V to 5.5V Input Voltage Range
  • 21V Over-Voltage Protection
  • 1.27MHz Fixed Frequency Operation
  • Low Profile 10-Pin WSON Package (3mm x 3mm x 0.8mm)
  • General Purpose I/O
  • Active Low Hardware Reset

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Description

The LM3509 current mode boost converter offers two separate outputs. The first output (MAIN) is a constant current sink for driving series white LED’s. The second output (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output voltage for powering OLED panels.

All trademarks are the property of their respective owners.

When configured as a dual output white LED bias supply, the LM3509 adaptively regulates the supply voltage of the LED strings to maximize efficiency and insure the current sinks remain in regulation. The maximum current per output is set via a single external low power resistor. An I2C compatible interface allows for independent adjustment of the LED current in either output from 0 to max current in 32 exponential steps. When configured as a white LED + OLED bias supply the LM3509 can independently and simultaneously drive a string of up to 5 white LED’s and deliver a constant output voltage of up to 21V for OLED panels.

Output over-voltage protection shuts down the device if VOUT rises above 21V allowing for the use of small sized low voltage output capacitors. The LM3509 is offered in a small 10-pin thermally- enhanced WSON package and operates over the -40°C to +85°C temperature range.

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Technical documentation

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No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet HE Boost for White LED's / OLED Displays w/ Dual Sinks & I2C Brightness Control datasheet (Rev. D) May 03, 2013
Technical articles How energy harvesting can extend the life of your fault indicator on the grid Oct. 18, 2017
Application notes Analog PWM Dimming in White-LED Drivers Dec. 21, 2016
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
User guides AN-1594 LM3509 Evaluation Board (Rev. A) Apr. 30, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$75.00
Description

The LM3509 current mode boost converter offers two separate outputs. The first output (MAIN) is a constant current sink for driving series white LED's. The second outut (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output (...)

Features
  • Integrated OLED Display Power Supply and LED Driver
  • Drives up to 10 LEDs at 30mA
  • Drives up to 5 LEDs at 20mA and delivers up to 21V at 40mA
  • Over 90% Efficient
  • 32 Exponential Dimming Steps
  • 0.15% Accurate Current Matching Between Strings
  • Internal Soft-Start Limits Inrush Current
  • True Shutdown Isolation for (...)

Reference designs

REFERENCE DESIGNS Download
Energy Harvesting and Fault Indicator Subsystem for Overhead Fault Indicators Reference Design
TIDA-00998 — The TIDA-00998 TI Design shows multiple architectures for extending primary battery life using a secondary battery or supercapacitor with energy harvested from a current transformer (CT) or solar cells. Optimal Power management is done using efficient LED Drivers to drive series or parallel strings (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WSON (DSC) 10 View options

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