Product category: Power Supply ICs and Controllers
News Release from: ON Semiconductor | Subject: NCP5007 and NCP5006
Edited by the Electronicstalk Editorial Team on 13 August 2004
Convertors offer compact backlight solution
Two new fully integrated white LED boost convertors drive up to five white LEDs in series to simplify and miniaturise colour LCD illumination used in digital cameras, cellphones and PDAs
The NCP5007 and NCP5006 are fully integrated white LED boost convertors that drive up to five white LEDs in series to simplify and miniaturise colour LCD illumination used in digital cameras, cellphones and PDAs. "Last year, for the first time, the cell phone replacement market exceeded 50% of total units", said Bernie Weir, ON Semiconductor Applications Director for Analog Portable and Consumer Products.
This article was originally published on Electronicstalk on 13 August 2004 at 8.00am (UK)
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"This has created a more sophisticated audience of second- and third-generation consumers who now expect their cellphones to be multimedia voice communication devices with colour LCD screens".
"To effectively support the increased display use time required by colour screens, gaming, Internet browsing and short messaging features, design engineers must now carefully consider every microwatt utilised".
Highly power-efficient backlighting - accomplished in a compact PCB footprint - is required for the colour LCD displays that are quickly becoming standard equipment in most new digital cellular handsets, PDAs and digital cameras.
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A series configured array of white LEDs is currently considered the most effective backlighting solution for the design of colour LCD displays because this architecture achieves ideal current matching of the LEDs to provide uniform lighting.
The NCP5007 and NCP5006 offer just such a solution.
The devices operate as a DC/DC boost convertor that regulates the current through the LED string.
Dimming is accomplished by applying a pulsewidth modulated signal (PWM) to change the average output current.
In addition to being offered in a compact, low-profile SOT23-5 package, the NCP5007 and NCP5006 incorporate built-in over-voltage protection that eliminates the need for an external Zener diode.
This works to simplify and miniaturise the circuit.
With an input voltage range of 2.7 to 5.5V, the devices are ideal for battery power applications that use a single-cell Li-ion battery or three- or four-cell NiMH batteries.
In addition, the NCP5006 is available in an industry standard pinout which makes it easy to implement in existing platforms.
The NCP5007 and NCP5006 are offered in compact, low-profile SOT23-5 packages and priced at $0.50 per unit in 10,000-unit quantities.
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