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White LED driver delivers 120mA output current

Posted: 07 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Allegro MicroSystems? A8435? LED driver?

Charge pump white LED driver

Allegro MicroSystems Inc. unveiled a new high efficiency charge pump white LED driver that promises a simple, low-cost white LED driver solution for portable electronics display applications.

Using a proprietary control scheme (1x, 1.5x), the new A8435 LED driver can output well-matched LED currents for up to four channels, while maintaining the highest efficiency over most of the Li-ion battery lifetime. This device accepts an input range of 2.7V to 5.5V, and delivers up to 30mA for each of the four regulated current sources. The A8435 can deliver a total output current of 120mA, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be combined for WLED flash/torch applications.

According to the press release, the A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods: (a) choosing an appropriate value for RSET; (b) two-bit parallel control with three levels; (c) PWM control; or (d) one-wire serial pulse input to enable the part and set up to eleven dimming levels from 100 percent down to 5 percent.

The A8435 is available in a thin profile (0.75mm) 3-by-3mm MLP-16 package (A8435EES). It is priced at 59 cents in quantities of 10,000.

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