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Maxim integrates white LED driver, AB audio amp

Posted: 19 Jun 2007     Print Version  Bookmark and Share

Keywords:white LED driver  LED  Class AB audio amplifier 

Maxim Integrated Products has unveiled what it claims 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, 3-by-3-by-0.8mm, TQFN package, the MAX8678 is 50 per cent smaller than the standard two-chip solution.

To achieve the industry's highest efficiency, 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 mismatch. These innovative features enable the MAX8678 to be 12 per cent 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 critical.

MAX8678 is claimed to be 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 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 minimising external component count. The amplifier achieves a 90dB PSRR at 1kHz. Moreover, it features a flexible, single-wire, serial pulse interface to realise gain settings from -9dB to 18dB in 3dB steps and it integrates click-and-pop suppression for rich, clean sound quality.

MAX8678 is fully specified for the extended temperature range of -40°C to 85°C. Prices start at Rs.67.43 ($1.65) for 2,500-unit quantities. An evaluation kit is available to speed designs.

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