LM3509SDX/NOPB
ActiveHIGH EFFICIENCY BOOST FOR WHITE LED'S AND/OR OLED DISPLAYS WITH DUAL CURRENT SINKS
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LM3509SDX/NOPB
ActiveHIGH EFFICIENCY BOOST FOR WHITE LED'S AND/OR OLED DISPLAYS WITH DUAL CURRENT SINKS
Technical Specifications
Parameters and characteristics for this part
| Specification | LM3509SDX/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel | 30 mA |
| Dimming | I2C |
| Frequency | 1.27 MHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 2 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 10-WFDFN Exposed Pad |
| Supplier Device Package | 10-SON (3x3) |
| Topology | Step-Up (Boost) |
| Type | DC DC Regulator |
| Voltage - Output | 21 V |
| Voltage - Supply (Max) | 5.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 4500 | $ 1.14 | |
| 9000 | $ 1.10 | |||
| LCSC | Piece | 1 | $ 2.81 | |
| 200 | $ 1.09 | |||
| 500 | $ 1.05 | |||
| 1000 | $ 1.03 | |||
| Texas Instruments | LARGE T&R | 1 | $ 1.87 | |
| 100 | $ 1.55 | |||
| 250 | $ 1.11 | |||
| 1000 | $ 0.84 | |||
Description
General part information
LM3509 Series
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.
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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.
Documents
Technical documentation and resources
