Components: High-Efficiency White LED Drivers Suit Small Module Backlighting

Dec. 16, 2004
The STLD20D is an SOT-23 package that drives white LEDs with 80% conversion efficiency over a wide range of battery voltages. Up to four LEDs can be driven in series from a 2.5-V dc battery. Dynamic supply voltage rejection prevents backlight...

The STLD20D is an SOT-23 package that drives white LEDs with 80% conversion efficiency over a wide range of battery voltages. Up to four LEDs can be driven in series from a 2.5-V dc battery. Dynamic supply voltage rejection prevents backlight flickering. An LED disconnect switch reduces standby current (1 mA) leakage. Also, it includes soft-start functions and a shut-down mode with dimming control. Overvoltage and overtemperature protection are incorporated. A pulse-width-modulation input allows white LED dimming without reducing bias voltage, minimizing white-output color changes. A 3- by 3-mm QFN package is available as well. Price is $0.45 each in 100,000-unit quantities.

STMicroelectronics Inc.www.st.com; (781) 861-2650

About the Author

Roger Allan

Roger Allan is an electronics journalism veteran, and served as Electronic Design's Executive Editor for 15 of those years. He has covered just about every technology beat from semiconductors, components, packaging and power devices, to communications, test and measurement, automotive electronics, robotics, medical electronics, military electronics, robotics, and industrial electronics. His specialties include MEMS and nanoelectronics technologies. He is a contributor to the McGraw Hill Annual Encyclopedia of Science and Technology. He is also a Life Senior Member of the IEEE and holds a BSEE from New York University's School of Engineering and Science. Roger has worked for major electronics magazines besides Electronic Design, including the IEEE Spectrum, Electronics, EDN, Electronic Products, and the British New Scientist. He also has working experience in the electronics industry as a design engineer in filters, power supplies and control systems.

After his retirement from Electronic Design Magazine, He has been extensively contributing articles for Penton’s Electronic Design, Power Electronics Technology, Energy Efficiency and Technology (EE&T) and Microwaves RF Magazine, covering all of the aforementioned electronics segments as well as energy efficiency, harvesting and related technologies. He has also contributed articles to other electronics technology magazines worldwide.

He is a “jack of all trades and a master in leading-edge technologies” like MEMS, nanolectronics, autonomous vehicles, artificial intelligence, military electronics, biometrics, implantable medical devices, and energy harvesting and related technologies.

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