Diodes Incorporated
U QFN4040 20

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3W Stereo Class D with Separate Shutdown Control

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The PAM8404 is a 3W high efficiency filterless Class-D audio amplifier in 4mmX4mm and 2mmX2mm wafer chip scale (WCSP) packages that requires few external components. Features like 89% efficiency, -63dB PSRR, improved RF-rectification immunity, and very small PCB area make the PAM8404 Class-D amplifier ideal for cellular handset and PDA applications. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the PAM8404. The PAM8404 allows independent gain by summing signals from seperate sources, and has as low as 43μV noise floor. PAM8404 is available in QFN 4mmx4mm and WCSP 2mmx2mm packages.


  • 3W Output at 10% THD with a 4Ω Load and 5V Supply
  • Supply Voltage from 2.5V to 5.5V
  • Efficiency Up to 89%
  • Superior Low Noise without Input
  • Few External Components to Save the Space and Cost
  • Short Circuit Protection
  • Thermal Shutdown
  • Space Saving Packages : 2mm X 2mmWCSP 4mm X 4mm Thin QFN
  • Pb-Free Packages


  • LCD Monitor / TV Projector
  • Notebook Computers
  • Portable Speakers
  • Portable DVD Players, Game Machines
  • Cellular Phones/Speaker Phones

Product Specifications

Product Parameters

Minimum VDD (V) 2.5
Compliance (Only Automotive supports PPAP) Standard
AEC Qualified No
Maximum VDD (V) 5.5 V
IQ (mA) 11 mA
Power/CH (W) @ THD=10% 3
Power/CH (W) @ THD=1% 2.4
Mono or Stereo Stereo
Class-D or AB D
Power Limit No
Anti-Sat No
Headphone Out No
Efficiency (%) 89 %
Volume/ Gain 4-Settings
Gain Min 6 dB
Gain Max 24 dB
SNR 87 dB
PSRR 63 dB
Special Feature N/A

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