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Class D Audio Amplifier from AnalogicTech designed for Portable Applications

Advanced Analogic Technologies Inc. (AnalogicTech) announced their first Class D audio amplifier. The AAT5101 2.5W Class D audio amplifier delivers power savings by combining low voltage operation with low quiescent current and standby current for portable electronic systems.

Lithium-ion batteries currently used in most portable systems today shutdown at 2.5V, but new batteries coming onto the market are designed to operate at much lower voltages. The AAT5101 supports operation down to 2.1V and offers low quiescent and standby current to reduce power requirements and extend battery life.

Reduced Operating Voltage

The mono class D audio power amplifier operates from a 2.1V to 5.5V supply voltage for systems using next generation low voltage Li-ion/polymer batteries. To further extend battery life, the audio amplifier delivers up to 92 percent efficiency and offers a very low 0.06 A shutdown current and 1.35 mA quiescent current.

The AAT5101 outputs 1.35W with an 8 ohm load and THD+N < 1 percent and 2.5W with a 4 ohm load and THD+N < 10 percent. The low noise, filterless PWM architecture simplifies system design by eliminating the output filter, reducing external component count and system cost. To ensure clean sound across the entire audio output range, the AAT5101 delivers 0.12 percent THD+N at 5V with 8 ohm load and Pout = 1.0W. PSRR is -60 dB typical, while SNR is 91 dB typical.

The device also includes integrated thermal and short circuit protection circuitry with self-recovery to protect the device from damage during over current conditions. Proprietary circuitry effectively suppresses pop and click noise.

Price and Availability

The AAT5101 is qualified across the -40 C to +85 C temperature range. The new audio amplifier is available in compact 9-pin wafer-level chip scale packaging (WLCSP) and sells for $0.28 in 1K quantities.

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