Texas Instruments Incorporated (TI) (NYSE:TXN) introduced a monolithic, filter-free Class-D audio amplifier with an integrated boost converter for portable applications including wireless handsets, personal navigation devices, portable gaming and wireless speakers. Addressing the need for louder volume and higher output power from the speakers, the TPA2014D1 provides up to 1.5 W across an 8-Ohm load, ensuring that volume is maintained even when the battery discharges to its minimum voltage.
Conventional Class-D amplifiers for portable devices are designed to provide high output power, which is dependent on battery voltage. As the battery discharges, the maximum output power decreases, causing reduced volume and increased distortion. The TPA2014D1 provides a higher constant output power across the entire Li-Ion battery range, thus maintaining loud volume, even as the battery discharges. In addition, the TPA2014D1 has a high overall efficiency of 85 percent, which results in longer battery life and increased talk/playback time.
Additional features of the device enhance portable audio performance. The TPA2014D1 features a wide voltage supply range of 2.5 V to 5.5 V and a very high power supply rejection ratio (PSRR) of 91 dB, which simplify power supply design and enable a connection directly to the battery without any degradation of sound quality. The TPA2014D1 includes an integrated phase-locked loop (PLL), which synchronizes the Class-D amplifier and boost converter clocks in order to eliminate potential audible beat frequencies.
Pricing and availability
The TPA2014D1 Class-D audio power amplifier is available now from TI and its authorized distributors in a 4 mm x 4 mm QFN package and will be available at the end of May in a very small 2.3 mm x 2.3 mm WCSP package, saving cost and considerable board area. Suggested resale pricing is $1.32 for the QFN package and $1.40 for the WCSP package in 1,000-piece quantities. Samples and EVMs are available from ti.com/audio.
Extending TI’s offering for portable devices
The TPA2014D1 extends TI’s portfolio of Class-D amplifiers for the portable market, such as the TPA2013D1, which is available for customers requiring higher output power and the ability to drive a 4-Ohm load. Both devices are designed to work with TI’s portable audio converters such as the TLV320AIC3106, the TLV320DAC32 digital-to-analog converter and the AureusTM platform of audio DSPs. TI provides the silicon, software, systems expertise and support for the entire audio signal chain, enabling customers to get to market quickly. For more information see the Audio Solutions Guide at ti.com/audio. In addition, see TI’s power management products for portable consumer applications at power.ti.com.