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Stereo amplifier’s low standby current reduces battery drain in portable apps

Geneva — STMicroelectronics' 2×1-W stereo audio power amplifier with active low standby mode is said to deliver high-end audio capability to portable applications.

The amplifier can be used in cellular mobile phones, notebooks, PDAs, LCD monitors, TVs and portable audio devices.

The TS4984 delivers 1 W per channel of continuous rms output power at 5 V into 8-Ω loads, with total harmonic distortion plus noise (THD+N) under 1 percent. It operates from 2.2 V to 5.5 V.

With a signal-to-noise (SNR) of 100 dB (typical), and a power supply rejection ratio (PSRR) of 62dB at 217 Hz with grounded inputs, this audio amplifier provides a high quality audio signal for the smallest of portable devices. Dedicated circuitry guarantees virtually no 'pop' and 'click' at power-on or power-off.

An external standby mode control reduces the supply current to less than 10 nA for each channel. The device also has thermal shutdown protection. External resistors set the gain of each channel.

It is available in a QFN16 4mm x 4mm, 0.5-mm pitch, lead-free package. Pricing is 90 cents in 5K quantities. Click here for the TS4984 data sheet.

STMicroelectronics , 1-781-861-2650, www.St .com.

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