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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.
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.
PAM8905 features DC input protection and all outputs are fully protected against output-to-output shorts. The PAM8905 is available in tiny WCSP12 (1.5mm x 2.0mm) packages.



  • Cell Phones
  • PDA
  • GPS
  • Portable Electronics
  • Speakers


  • 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
  • High PSRR
  • DC Input Protection
  • Auto-Recovery Short-Circuit Protection
  • Thermal Shutdown
  • Available in U-WLB1520-12 Package

Product Specifications

Product Parameters

Qualified to AECQ10x No
Automotive Compliant PPAP No
Minimum VDD 2.8 V
Maximum VDD 5.2 V
IQ 4 mA
Power/CH (W) @ THD=10% N/A
Power/CH (W) @ THD=1% 1.9
Mono or Stereo N/A
Class-D or AB D
Power Limit N/A
Anti-Sat N/A
Headphone Out N/A
Efficiency 85 %
Volume/ Gain AGC
Gain Min N/A dB
Gain Max 20 dB
SNR 95 dB
PSRR -70 dB
Special Feature N/A

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Quality & Reliability

Technical Documents

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
PAM8905PZR Digi-Key Electronics 2954 7/22/2019 Buy Now Americas
PAM8905PZR Mouser Electronics Inc. 2864 7/22/2019 Buy Now Americas


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