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


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.


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


  • 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

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% 4
Power/CH (W) @ THD=1% N/A
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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Quality & Reliability

Technical Documents

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
PAM8945PJR Avnet EU 6000 7/22/2019 Buy Now Europe, Middle East, Africa
PAM8945PJR Arrow Electronics 835 7/22/2019 Buy Now Americas
PAM8945PJR Digi-Key Electronics 741 7/22/2019 Buy Now Americas
PAM8945PJR Mouser Electronics Inc. 616 7/22/2019 Buy Now Americas


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