ST mobile phone audio power amplifier

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(STMicro) has introduced a compact Class D amplifier chip designed specifically for next-generation handsets and other products that pursue higher output power while conserving power and extending battery life. With a 5V supply, the new TS4962 delivers 3W of output power to a 4 ohm load with an amplification efficiency of up to 88%. This parameter is much higher than the Class AB amplifiers that are widely used in today's mobile phones.

Operating from a wide supply voltage range of 2.4V to 5.5V, the TS4962 has a typical quiescent current of 2.3mA when there is no input signal. The standby power consumption is only 10nA when the power supply is turned off with an active low-state control. The noise reduction circuit can not only reduce the switching noise. It also allows the amplifier to start within 5ms. The gain is set by two external resistors.

The fully differential design reduces RF rectification while saving a bypass capacitor. When the power supply voltage is 5V, the output power of the 4Î© load is 3W and the output power to the 8Î© load is 1.75W under the condition of THD+N (total harmonic distortion + noise) up to 10%. When the power supply voltage is 5V, the output power of the 4Î© load is 2.3W at the maximum 1% of THD+N, and the output power is 0.75W for the 8Î© load. The typical signal-to-noise ratio is 85dB.

This compact amplifier is especially suitable for mobile phones and speakerphones. Its high energy efficiency helps to extend talk time, while also bringing many new features to PDAs and laptops. The chip is packaged in a 1.6mm2 9-bump flip-chip lead-free package and comes with an application development board. The amplifier chip is pre-installed on the flip-chip of the DIP adapter on the board for easy access during evaluation. The new product is now in volume production and is priced at $0.55 in 5000 units.

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