A Product Line of
1.9W Class-D Audio Amplifier with Integrated
Boost Converter and Battery Tracking AGC
The PAM8905 is a high efficiency Class-D audio power amplifier with
an integrated boost converter. It drives up to 1.9W (1% THD+N) into
an 8Ω speaker. With 85% typical efficiency, the PAM8905 helps
extend battery life when playing audio.
A PVDD SW BGND
The built-in boost converter generates the voltage rail for the output
stage. This provides a louder audio output than a stand-alone
amplifier connected directly to the battery. It also maintains a
consistent loudness, regardless of battery voltage.
The PAM8905 features battery tracking AGC function which adjusts
the Class-D gain to limit battery current at lower battery voltage.
D PGND AGND
PAM8905 features DC input protection and all outputs are fully
protected against output-to-output shorts. The PAM8905 is available
in U-WLB1520-12 package.
Built-In Battery Tracking Automatic Gain Control (AGC)
High Efficiency Integrated Boost Converter Over 85%
1.9W into an 8Ω Load from a 3.6V Supply
Operates from 2.8V to 5.2V
Efficient Class-D Prolongs Battery Life
Minimized ON/OFF Pop Noise
Superior Low Noise
DC Input Protection
Auto-Recovery Short-Circuit Protection
Available in U-WLB1520-12 Package
Typical Applications Circuit
2.8V to 5.2V
Document number: DS37026 Rev. 2 - 2
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