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The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal of up to 100kHz to the DIM pin. Internal soft-start circuitry is designed to eliminate high in-rush current at start-up. For maximum safety, the device features an advanced short-circuit protection when the output is shorted to ground. Additionally, over-voltage protection and an 850kHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. During shutdown, the output is disconnected from the input preventing a leakage current path through the LEDs to ground. The LM3508 is available in a tiny 9-bump chip-scale DSBGA package.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3508 Synchronous Magnetic Constant Current White LED Driver datasheet (Rev. C) | 03 May 2013 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Application note | Analog PWM Dimming in White-LED Drivers | 21 Dec 2016 | ||
| EVM User's guide | AN-1593 LM3508 Evaluation Board | 04 Jun 2007 |
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The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The (...)
| Package | Pins | Download |
|---|---|---|
| DSBGA (YZR) | 9 | View options |
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