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FIRST 85% EFFICIENT, FRACTIONAL, WHITE-LED CHARGE PUMP WITH DUAL, SINGLE-WIRE DIMMING CONTROL FOR MAIN AND SUB-DISPLAYS
SUNNYVALE, CA-February 2, 2004-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX1575, a high-efficiency 1x/1.5x charge pump for driving up to four white LEDs in the main display and up to two white LEDs in the sub-display. By utilizing the adaptive 1x/1.5x modes and low-dropout, active-current regulators, the MAX1575 attains up to 92% efficiency or an average of 85% over the full 1-cell Lithium (Li+) battery input-voltage range. It also achieves excellent matching for uniform backlighting of color LCD displays.
The MAX1575 features individual single-wire, serial-pulse interfaces for dimming brightness down to 5%, soft-start to limit inrush current, overvoltage protection, thermal shutdown, and complete input-to-output disconnect during shutdown (0.1 microamp shutdown current). The 1MHz fixed-frequency switching allows for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple, and the input-voltage range is 2.6V to 5.5V.
The MAX1575 is available in a space-saving, 4mm x 4mm, 16-pin TQFN package, and is screened for the extended temperature range (-40 degrees Celsius to +85 degrees Celsius). Prices start at $1.52 (1000-up, FOB USA). An evaluation kit is available to speed designs. For additional white LED solutions, visit: www.maxim-ic.com/solutions/whiteLED.
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