One chip powers up all handset LEDs
A
National Semiconductor product story
Edited by the Electronicstalk editorial team
Dec 10, 2004
National Semiconductor has a complete, low noise white LED driver system for wireless handsets and other portable devices that use a display and keypad.
National Semiconductor has a complete, low noise white LED driver system for wireless handsets and other portable devices that use a display and keypad.
The LM3570 provides three constant current sources for output up to 80mA total drive current, powering up to three white LEDs on the main display and a large number of LEDs for subdisplays.
With its high-efficiency 3/2 boost function, the LM3570 extends battery life and reduces system battery requirements due to greater efficiency.
Applications for the LM3570 include portable devices using white or blue LEDs with display or keypad backlight or frontlight, and one-cell lithium-ion battery-operated equipment including PDAs, handheld PCs and cellular phones.
National's LM3570 is available now in a non-pullback 14-pin LLP package and costs $1.40 in 1000-unit quantities.
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