Summary
High-performance class-G stereo headphone amplifier with I2C volume control September 2011 Rev 2
Description
The TS4621B is a class-G stereo headphone driver dedicated to high audio performance, high power efficiency and space-constrained applications. It is based on the core technology of a low power dissipation amplifier combined with a highefficiency step-down DC/DC converter for supplying this amplifier. When powered by a battery, the internal stepdown DC/DC converter generates the appropriate voltage to the amplifier depending on the amplitude of the audio signal to supply the headsets. It achieves a total 2.1 mA current consumption at 100 µW output power (10 dB crest factor). THD+N is 0.02 % maximum at 1 kHz and PSRR is 100 dB at 217 Hz, which ensures a high audio quality of the device in a wide range of environments. The traditionally bulky output coupling capacitors can be removed. A dedicated common-mode sense pin removes parasitic ground noise. The TS4621B is designed to be used with an output serial resistor. It ensures unconditional stability over a wide range of capacitive loads. The TS4621B is packaged in a tiny 16-bump flip-chip package with a pitch of 400 µm. TS4621BEIJT - flip-chip Balls are underneath Pinout (top view) AVDD SW INLC1 CMS SDA AGND C2 HPVDD VOUTL VOUTR INL+ INR+ PVSS SCL INR4 3 2 1 A B C D AVDD SW INLC1 CMS SDA AGND C2 HPVDD VOUTL VOUTR INL+ INR+ PVSS SCL INR4 3 2 1 A B C D