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4.0W Mono Class-G 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 can drive up to 4.0W (10% THD+N) into a 4Ω speaker with a power supply as low as 2.8V.

The built-in boost converter generates the voltage required for the output stage providing a much louder audio and consistent output power regardless of the battery voltage. The PAM8945 features battery tracking AGC function which adjusts the amplifier gain to limit battery current at lower battery voltage.

Combining battery tracking and the high efficiency (typically 85%) the PAM8945 provides high quality audio for extended periods of time compared to a standard Class D amplifier and a battery.

The PAM8945 features DC input protection and all outputs are fully protected against output-to-output shorts. The PAM8945 is available in tiny TQFN2030-12L package.


  • Built-In Battery Tracking Automatic Gain Control (AGC)
  • High Efficiency Integrated Boost Converter Over 85%
  • 4.0W into an 4Ω 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


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

Product Specifications

Product Parameters

Minimum VDD (V) 2.8
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 Feature Boost Converter Built-in

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Avnet EU 62038 10/3/2022 Germany Buy Now
Arrow Electronics 6000 10/3/2022 United States Buy Now
Digi-Key Electronics 29834 10/3/2022 Europe, Asia, North America Buy Now
Farnell, An Avnet Company 3961 10/3/2022 England Buy Now
Mouser Electronics Inc. 13094 10/3/2022 South America, North America, Asia, Europe, Middle East Buy Now
Future Electronics - Europe 42000 10/2/2022 England Contact Sales
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