High efficiency boost for white LED's and/or OLED displays with dual current sinks
Product details
Parameters
Package | Pins | Size
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | HE Boost for White LED's / OLED Displays w/ Dual Sinks & I2C Brightness Control datasheet (Rev. D) | May 03, 2013 |
White paper | Common LED Functions and LED Driver Design Considerations | Sep. 21, 2020 | |
Technical articles | Overcoming challenges for backlight LED drivers in automotive display solutions | Jul. 16, 2020 | |
Technical articles | How energy harvesting can extend the life of your fault indicator on the grid | Oct. 18, 2017 | |
Application note | 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 | |
User guide | 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
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 (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Design files
-
download TIDA-00998 BOM.pdf (98KB) -
download TIDA-00998 BOM (CT).pdf (94KB) -
download TIDA-00998 Assembly Drawing.pdf (466KB) -
download TIDA-00998 Assembly Drawing (CT).pdf (184KB) -
download TIDA-00998 PCB.pdf (1252KB) -
download TIDA-00998 PCB (CT).pdf (747KB) -
download TIDA-00998 CAD Files.zip (1561KB) -
download TIDA-00998 CAD Files (CT).zip (1351KB) -
download TIDA-00998 Gerber.zip (2632KB) -
download TIDA-00998 Gerber (CT).zip (988KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
WSON (DSC) | 10 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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