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The AAT5101 2.5-W mono Class D audio amplifier from Advanced Analogic Technologies (AnalogicTech) combines low-voltage operation with low quiescent current and standby current that’s an order of magnitude below competitive devices, according to the company. It operates from a 2.1- to 5.5-V supply voltage, suiting it for systems using next-generation, low-voltage lithium-ion (Li-ion) batteries.

To further extend battery life, the amplifier delivers up to 92% efficiency and offers a 0.06-µA shutdown current and 1.35-mA quiescent current. It outputs 1.35 W with an 8-Ω load and a total harmonic distortion plus noise (THD+N) of less than 1% and 2.5 W with a 4-Ω load and THD+N of less than 10%. Also, it features integrated thermal and short-circuit protection circuitry with self-recovery to protect the device from damage during overcurrent conditions. Proprietary circuitry suppresses pop and click noise.

Its low-noise, filterless pulse-width modulation (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, it delivers 0.12% THD+N at 5 V with an 8-Ω load and POUT = 1.0 W. Its power-supply rejection ratio (PSRR) is –60 dB typical, while its signal-to-noise ratio (SNR) is 91 dB typical. 

The amplifier is qualified from –40°C to 85°C. It is available in compact nine-pin wafer-level chip-scale packaging (WLCSP) and costs $0.28 in 1000-unit lots.