Driver Chip
April 2007
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A compact stereo headphone and loudspeaker driver chip from the company has a flexible I2C bus control interface, which is intended for mobile phones, PDAs and laptop computers. The TS4956, in a lead-free 2.5 mm by 2.4 mm flip-chip package, can drive up to 38 mW per channel continuous average power into 16-W headphone loads, or 450 mW into 8-W loudspeaker loads, when operating on a 3.3 V power supply. Designed for space-critical applications, the device minimizes the number of external components required by providing I2C selection of eight different operating modes, including a stereo loudspeaker option, and 32-step -34 dB to +12 dB digital volume control. The chip also features an ultra-low standby current of 0.5-µA, with 10-nanoamps shutdown current, and can operate on power supplies from 2.7 V to 5.5 V. Pop and click noise-reduction circuitry eliminates turn-on and turn-off noise. In addition, the device is protected by an over-temperature shutdown mechanism activated at 150ºC. Operating temperature range is -40°C to +85ºC. STMicroelectronics

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