IT4990 - 1.37 Watt Low Noise Audio Power Amplifier


The IT4990 is an audio power amplifier designed for portable communication device applications such as mobile phone applications. The IT4990 is capable of delivering 1.37W of continuous average power to an 8Ω BTL load and with less than 1% distortion (THD+N) from a 5V power supply, and 470mW to a 8Ω BTL load from a 3V power supply. The IT4990 provides high quality output power while requiring few external components and minimal power consumption. It features a low-power shutdown mode, which is achieved by driving the SHDNB pin with logic low. For maximum flexibility, the IT4990 provides an externally controlled gain (with resistors), as well as an externally controlled turn-on time (with the bypass capacitor). The IT4990 is available in a 1.4mm×1.4mm WCSP package.


  • 2.3V -5.5V operation range

  • Output power

  • 1.37 W into 8Ω at 5V Supply at THD=1% (Typ.)

    470 mW into 8Ω at 3V Supply at THD=1% (Typ.)

    340 mW into 8Ω at 2.6V Supply at THD=1% (Typ.)

  • Low quiescent current

  • 2.5mA Typical at VDD=5V

    Shutdown current < 0.1uA

  • High signal-to-noise ratio performance

  • Po=1W, f=1KHz, SNR=101 dB (A-weighting) at VDD=5V

  • Ultra low noise (12u Vrms, A-weighting) and output offset voltage

  • Thermal shutdown protection

  • No output coupling capacitors, snubber networks or bootstrap capacitors required

  • Unity-gain stable

  • External gain configuration capability



Technology Information:

  Data Sheet

  Package: WCSP-9


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