Geneva STMicroelectronics unveiled a filterless 3-watt Class D power amplifier today for mobile phones and other portable applications that is said to provide higher audio power output while preserving and extending battery life.
STMicro's Class D TS4962 amplifier can be used for gaming, polyphonic ringers and speaker phone applications, as well as PDAs and laptop computers. It provides 3 W of output power into a 4-ohm loudspeaker when operating on a 5-volt power supply, and achieves 88 percent efficiency far higher than that of the Class AB amps commonly used in mobile phones today, the company said.
The TS4962 audio power amplifier is designed to operate over a wide 2.4 V to 5.5 V supply voltage range. Its quiescent current with no input signal is 2.3 milliamps typical, and standby current when powered down using its active-low control line is 10 nanoamps. Pop and click reduction circuitry provides low on/off switching noise while allowing the amplifier to start within 5 milliseconds, according to STMicro. The gain is set using two external resistors.
A fully differential design is said to reduce RF rectification effects and eliminate the need for a bypass capacitor. Output power is 3 W into 4 ohms or 1.75 W into 8 ohms, at 10 percent maximum total harmonic distortion plus noise (THD+N), on a 5-V supply. At 1 percent maximum THD+N, output power is 2.3 W into 4 ohms on a 5-V supply, or 0.75 W on a 3-V supply. Signal to noise ratio is typically 85 dB.
The TS4962 amplifier is available in a lead-free, 1.6-mm square, 9-bump FCP, 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 55 cents each in 5,000-piece quantities. Click here for STMicro's TS4962 data sheet.
STMicroelectronics, 1-888-787-3550, www.ST.com.