ST TS4621MLEIJT

A class-G stereo headphone driver dedicated to high-performance audio, 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). 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. Designed to be used with an output serial resistor. It ensures unconditional stability over a wide range of capacitive loads. Packaged in a tiny 16-bump flip-chip package with a pitch of 400 μm.

• 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"
• Gain settings: 0 dB and 6 dB
• Integrated high efficiency step-down converter
• Low standby current: 5 μA max
• Output-coupling capacitors removed
• Thermal shutdown Flip-chip package: 1.65 mm × 1.65 mm, 400 μm pitch, 16 bumps

• Cellular phones, smartphones
• Mobile internet devices
• PMP/MP3 players
• Portable CD/DVD players