A 62mW stereo class-G headphone driver with 108dB dynamic range and 600µA/channel quiescent current

Mobile and portable devices like smartphones and tablets require headphone drivers that consume the lowest possible levels of quiescent current while operating directly from available battery voltages. Key headphone performance parameters for these devices are high dynamic range, high output power and low pop-and-click noise. This paper demonstrates a class-G headphone driver with 600μA/channel quiescent current that operates over a 2.95 to 4.5V supply range, which is compatible with Li-Ion batteries. This headphone driver achieves 108dB dynamic range, 62mW output power and 50μV pop-and-click noise.