Industry's Most Efficient Negative-Charge-Pump, White-LED Driver Integrates a Class AB Audio Amplifier to Save 50% PCB Area
Note to Editor:
- The MAX8678 is a negative-charge-pump, white-LED backlight driver with an integrated Class AB audio amplifier.
- This device saves 50% PCB area compared with standard two-chip solutions.
- This space-saving solution is enabled by the MAX8678's unique integration of the industry's most efficient white-LED driver and a Class AB audio amplifier.
- The MAX8678 is ideal for handheld devices in which battery life is precious and PCB space is limited.
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SUNNYVALE, CA—May 31, 2007—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX8678, the industry's only white-LED (WLED) driver to combine a highly efficient negative charge pump with a fully differential, bridged audio amplifier. Available in a tiny, 3mm x 3mm x 0.8mm, TQFN package, this single-chip solution is 50% smaller than the standard two-chip solution. To achieve the industry's highest efficiency, the MAX8678 features a negative architecture that completely eliminates high-side in-line resistance, delaying 1x to 2x mode transition during battery discharge. The independent adaptive-mode switching for each LED further extends battery life, even with large LED forward-voltage (Vf) mismatch. These innovative features enable the MAX8678 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 MAX8678 is the only WLED driver to seamlessly integrate a mono, Class AB audio amplifier. This audio amplifier accepts differential input signals and offers excellent noise immunity to improve audio reproduction. It also delivers 1.1W to the speaker differentially through a bridge-tied-load (BTL) output stage. This provides up to four times more output power than a conventional, single-ended output stage, thus eliminating the need for output-coupling capacitors and further minimizing external component count. The amplifier achieves a superb 90dB PSRR at 1kHz. Moreover, it features a flexible, single-wire, serial pulse interface to realize gain settings from -9dB to +18dB in 3dB steps, and it integrates click-and-pop suppression for rich, clean sound quality.
The MAX8678 is fully specified for the extended temperature range (-40°C to +85°C). Prices start at $1.65 (2500-up, FOB USA). An evaluation kit is available to speed designs.
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