SY24112QDC - Capacitor-less Headphone/Lineout Driver with LDO & Charge Pump


  • 21mW/Ch Output Power into 32Ω Load at 3.3V When RS=47Ω
  • 86mW/Ch Output Power into 32Ω Load at 3.3V When RS=0Ω
  • Wide Power Supply Range: 2.2V-5.5V
  • Ground Referenced Outputs Eliminate the DC Bias Voltage on the Headphone Ground Pin
  • No Output DC Blocking Capacitors
  • Reduced Board Area
  • Reduced Component Cost
  • Improved THD+N Performance
  • No Degradation of the Low Frequency Response Due to the Output Capacitors
  • Built in the LDO and the Charge Pump
  • Short Circuit Protection, Thermal Protection and Under Voltage Protection
  • Click and Pop Suppression Circuit
  • Surface Mount, QFN, 16 Pin, 3mm×3mm

Typical Application


The SY24112 is a stereo headphone/lineout driver designed to allow the removal of the output DC blocking capacitors for reducing the component counts and the cost. It is composed of a LDO and a charge pump. The SY24112 is an ideal choice for small portable electronics where size and cost are critical design parameters. The SY24112 is capable of driving 21mW into a 32Ω load at 3.3V when RS=47Ω. The gain of SY24112 is set by the Gain Control pin. The charge pump and the headphone power are supplied by the LDO.


  • Notebook Computers
  • CD/MP3 Player
  • Smart Phones
  • Cellular Phones
  • PDA