White LED Driver integrates 2 independent LDO regulators.
May 16, 2008 -
Available in 3 x 3 x 0.8 mm TQFN package, Model MAX8822 drives up to 4 white LEDs, and features negative-charge-pump architecture that eliminates high-side in-line resistance, delaying 1x to 2x mode transition during battery discharge. It utilizes independent, adaptive-mode switching for each LED to extend battery life. Fully specified over -40 to 85°C extended temperature range, device suits cell phones, smartphones, PDAs, and other handheld devices.
Highest Efficiency, Negative-Charge-Pump White-LED Driver with Two LDO Regulators Saves 50% PCB Area
o The MAX8822 is a high-efficiency, negative-charge-pump WLED driver with two low-dropout (LDO) regulators.
o By integrating a negative charge pump and two LDO regulators, this device saves 50% PCB area as compared to standard two-chip solutions.
o The unique negative-charge-pump architecture and innovative adaptive-mode switching for each of four LEDs enable the MAX8822 to provide 12% higher efficiency than the competition.
o The MAX8822 is ideal for handheld devices in which battery life is precious and PCB space is limited.
SUNNYVALE, CA-April 17, 2008-Maxim Integrated Products (Pink OTC Markets: MXIM) introduces the MAX8822, the industry's only white-LED (WLED) driver to combine a highly efficient negative charge pump with two independent, low-dropout (LDO) regulators. Available in a tiny, 3mm x 3mm x 0.8mm TQFN package, this single-chip solution for driving up to four WLEDs is 50% smaller than the standard two-chip solution. To achieve the industry's highest efficiency, the MAX8822 features a negative-charge-pump architecture that completely eliminates high-side in-line resistance, delaying 1x mode to 2x mode transition during battery discharge. It utilizes independent, adaptive-mode switching for each LED to further extend battery life, even with large LED forward-voltage (VF) mismatch. These innovative features enable the MAX8822 to be 12% more efficient than competing solutions, thus making it ideal for use in cell phones, smartphones, PDAs, and other handheld devices in which space and battery life are precious.
The LDO regulators provide a low 45µVRMS 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°C to +85°C extended temperature range. Prices start at $1.55 (2500-up, FOB USA). An evaluation kit is available to speed designs.
Maxim Integrated Products, a two billion dollar company, designs and manufactures ICs for analog and mixed-signal applications. The company has designed over 5400 products, more than any other analog semiconductor company, in the 25 years since its founding.
Customer Service: 1-800-998-8800 Company Information: Name: Maxim Integrated Products Address: 120 San Gabriel Dr. City: Sunnyvale State: CA ZIP: 94086 Country: USA Phone: 408-737-7600 FAX: 408-737-7194 http://www.maxim-ic.com
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