Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8822
Edited by the Electronicstalk Editorial
Team on 18 April 2008
One chip replaces two in white LED drive
Device is claimed to be 12% more efficient than competing solutions, making it ideal for use in handheld devices in which space and battery life are precious.
Maxim Integrated Products has developed the industry's first white-LED driver to combine a highly efficient negative charge pump with two independent, low-dropout (LDO) regulators Available in a tiny, 3 x 3 x 0.8mm TQFN package, the MAX8822 is a single-chip solution for driving up to four WLEDs that is 50% smaller than the standard two-chip solution
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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To achieve the industry's highest efficiency, the MAX8822 features a negative-charge-pump architecture that completely eliminates high-side inline resistance, delaying 1x mode to 2x mode transition during battery discharge.
It uses independent, adaptive-mode switching for each LED to further extend battery life, even with large LED forward-voltage mismatch.
These innovative features enable the MAX8822 to be 12% more efficient than competing solutions, thus making it ideal for use in cellphones, smartphones, PDAs, and other handheld devices in which space and battery life are precious.
The LDO regulators provide a low 45uV RMS noise and high 60dB PSRR output for noise-sensitive applications, such as RF, LCD panels, and cameras.
Output voltages are programmable in 16 different combinations using a simple, serial-pulse control interface.
The MAX8822 is fully specified over the -40 to +85C extended temperature range.
Prices start at US $1.55 (2500-up).
An evaluation kit is available to speed designs.
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