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1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown



  • Tiny 1.25 x 1.25 mm 0.4mm pitch micro SMD package
  • Very low iddq (1.7mA at 5V)
  • PSRR 95dB at 217Hz
  • CMRR 70dB at 217Hz
  • SNR 108dB
  • THD+N 0.04% (Pout = 700mW)


  • Mobile phones
  • PDAs
  • Portable electronic devices and accessories


Texas Instruments  LM4941TMBD

The LM4941 is a W class AB fully differential audio amplifier in a tiny 0.4mm pitch micro SMD package. The LM4941 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.25 Watts of average power to an 8 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply.

The LM4941TMBD is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM4941TM. It is an easy-to-use stand-alone board that requires power and GND, a differential input signal and an output load.