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The APA2057A is a monolithic integrated circuit, whichcombines a stereo power amplifier and a stereo outputcapacitor-less headphone amplifier. The stereo poweramplifier provides 19-steps gain setting for flexibleapplication. The headphone amplifier is ground-refer-ence output, and no need the output capacitors for DCblocking. The advantages of eliminating the output ca-pacitor are saving the cost, PCB’s space and componentheight. Both the de-pop circuitry and the thermal shutdownprotection circuitry are integrated in the APA2057A,which reduces pops and clicks noise during power on/off and in shutdown mode. Thermal shutdown protectsthe chip from being destroyed by over-temperaturefailure. To simplify the audio system design in notebookcomputer applications, the APA2057A provides the in-ternal gain setting, and these features can minimizecomponents and PCB area. The APA2057A is available in both TSSOP-28P andTQFN5x5-28 packages. Both packages are character-ized by space saving and thermal efficiency.