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LDO WLED driver offers small solution size

Posted: 27 Nov 2008     Print Version  Bookmark and Share

Keywords:WLED  one-cell Li-ion battery  linear regulation topologies 

Use of white LED (WLED) drivers has increased in recent years due to the popularity of colour LCD screens on most portable electronic equipment. The white backlight required to bring out the colour in these screens is most often provided by white LEDs. In applications powered by a one-cell Li-ion battery, charge pumps or boost converters have been required to drive these LEDs because of their high forward voltage (4 V typical). As WLED technology has advanced, the forward voltage required has significantly dropped.

Today, WLEDs are available with a typical forward voltage of less than 3 V. The lower forward voltage eliminates the need for voltage boosting, permitting the use of linear regulation topologies that reduce costs and solution size and increase efficiency across the battery-discharge range.

This application note by Texas Instruments discusses the TPS7510x low-dropout (LDO) matching LED current source is a highly integrated white-LED driver optimised for low-power keypad and navigation pad LED backlighting applications.

View the PDF document for more information.





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