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Audio Power Amplifier from STMicroelectronics Enables Longer Talk-Times for Advanced Mobile Phones


Filter-free 3W Class D amplifier provides higher power with increased efficiency for gaming, polyphonic ringers and speaker phone applications

Geneva, January 16,2006 - STMicroelectronics (NYSE: STM), a world leader in analog ICs, has announced a compact Class D power amplifier chip intended for the new generation of mobile phones and other products seeking to provide higher audio power output while preserving and extending battery life. The new TS4962 will provide 3W of output power into a 4-ohm loudspeaker when operating on a 5V power supply, and achieves an outstanding 88% efficiency – far higher than that of the Class AB amplifiers commonly used in mobile phones today.

The TS4962 is designed to operate over a wide 2.4V to 5.5V supply voltage range. Its quiescent current with no input signal is 2.3mA typical, and Standby current when powered down using its active-low control line is just 10nA. Pop and Click reduction circuitry provides low on/off switching noise while allowing the amplifier to start within 5ms. The gain is set using two external resistors.

A fully differential design reduces RF rectification effects and eliminates the need for a bypass capacitor. Output power is 3W into 4 ohms or 1.75W into 8 ohms, at 10% maximum THD+N (Total Harmonic Distortion plus Noise), on a 5V supply. At 1% maximum THD+N, output power is 2.3W into 4 ohms on a 5V supply, or 0.75W on a 3V supply. Signal to noise ratio is typically 85dB.

This physically small amplifier is ideal for use in mobile phones and speakerphones – where its high efficiency will result in longer talk-times – as well as for bringing new features to PDAs and laptop computers. It is available in a lead-free, 1.6mm square, 9-bump flip-chip package, and is supported by a development board, which includes the device pre-mounted onto a flip-chip to DIP adapter for easier handling during evaluation. Available in production volume now the device is priced at $0.55 in quantities of 5000 pieces.

Further information is also available at

About ST’s MPA Group (Micro, Power, Analog)
STMicroelectronics is a world leader in offering complete system solutions that leverage its rich portfolio of Microcontrollers, Power and Analog products; advanced process and design technologies; and application expertise. MPA’s emphasis on solutions allows the Company to minimize time-to-market for all customers worldwide in existing and emerging applications.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today’s convergence markets. The Company’s shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2004, the Company’s net revenues were $8.76 billion and net earnings were $601 million. Further information on ST can be found at
Information last updated Jan 2005


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