Tiny audio amp produces 1.9W from 5V

May 28, 2015 | 01:54
PAM8905 audio amp
PAM8905 audio amp
The PAM8905 is a new audio amp chip from Diodes Incorporated measuring just 1.5 x 2.0 mm. The design operates in class D mode, achieving a total harmonic distortion of 1% (plus noise) and delivering a maximum of 1.9 W into 8 ohm using a power supply in the range between 2.8 V to 5.2 V. The PAM8905 features an integrated boost converter powering the output stage to achieve the rated output power and maintaining volume with falling battery voltage. The boost converter is a fully synchronous design, ensuring a low external component count and high efficiency.

Protection features of the PAM8905 include DC input protection which safeguards the speakers when the input is biased at a high DC voltage, output short circuit protection with auto recovery, under-voltage lockout, over-temperature and ON/OFF pop noise suppressor. The operating voltage range makes it ideal for mobile applications powered from a single 3.7 V Lithium ion battery.

The PAM8905 is available in a tiny 12-lead WCSP12 package measuring just 1.5 x 2.0 mm.
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