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 high-efficiency 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).

FEATUREs
■ Power supply range: 2.3 V to 4.8 V
■ 0.6 mA/channel quiescent current
■ 2.1 mA current consumption with
   100 µW/channel (10 dB crest factor)
■ 0.006% typical THD+N at 1 kHz
■ 100 dB typical PSRR at 217 Hz
■ 100 dB of SNR A-weighted at G = 0 dB
■ Zero pop and click
■ I2C interface for volume control
■ Digital volume control range from -60 dB to
   +4 dB
■ Independent right and left channel shutdown
   control
■ Integrated high-efficiency step-down converter
■ Low software standby current: 5 µA max
■ Output-coupling capacitors removed
■ Thermal shutdown
■ Flip-chip package: 1.65 mm x 1.65 mm,
   400 µm pitch, 16 bumps

APPLICATIONs
■ Cellular phones, smart phones
■ Mobile internet devices
■ PMP/MP3 players