Diodes Incorporated
W QFN2030 12

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4.0W Class-G Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC

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The PAM8945 is a high-efficiency Class-G audio power amplifier with an integrated boost converter. It drives up to 4.0W (10% THD+N) into a 4Ω speaker. With 85% typical efficiency, the PAM8945 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 PAM8945 features battery tracking AGC function which adjusts the amplifier gain to limit battery current at lower battery voltage.

The PAM8945 features DC input protection and all outputs are fully protected against output-to-output shorts. The PAM8945 is available in tiny W-QFN2030-12 package.


  • Built-in Battery Tracking Automatic Gain Control (AGC)
  • High-Efficiency Integrated Boost Converter Over 85%
  • 0W into a 4Ω Load at 10% THD
  • 2W into a 4Ω Load at 1% THD
  • Operates from 2.8V to 5.2V
  • Efficient Class-G 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 2.0mm x 3.0mm 12L W-QFN Package
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Cell Phones and Tablets
  • GPS
  • Portable and Batery Powered Electronics
  • Active and Wireless Speakers

Product Specifications

Product Parameters

Minimum VDD (V) 2.8
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
Maximum VDD (V) 5.2 V
IQ (mA) 4 mA
Power/CH (W) @ THD=10% 4
Power/CH (W) @ THD=1% 3.2
Mono or Stereo Mono
Class-D or AB D
Power Limit No
Anti-Sat No
Headphone Out No
Efficiency (%) 86 %
Volume/ Gain AGC
Gain Min N/A dB
Gain Max 20 dB
SNR 95 dB
PSRR 70 dB
Special Features Boost Converter Built-in

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