General Description
The APA2177 is a stereo, fixed gain, single supply, and cap-free headphone driver, which is available in a WLCSP- 16 packages.
The APA2177 is ground-reference output, and no need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, eliminating component height, and improving the low frequency response.

FEATUREs
• Operating Voltage: 2.4V~5.5V
• Supply Current
    - IDD=2.1mA at VDD=3.6V
• Low Shutdown Current
    - IDD=0.7mA at VDD=3.6V
• Ground Reference Output
    - No Output Capacitor Required (for DC Blocking)
    - Save the PCB Space
    - Reduce the BOM Costs
    - Improve the Low Frequency Response
• Output Power
    25mW/Ch into 16W at VDD=3.6V,THD+N=0.04%
    20mW/Ch into 32W at VDD=3.6V,THD+N=0.02%
• High PSRR: 90dB at 217Hz
• Fast Start-Up Time: 4ms
• Integrate the De-pop Circuitry
• Thermal Protection
• Surface-Mount Packaging
    WLCSP1.6x1.6-16
    TQFN3x3-16

APPLICATIONs
• Handests
• PDAs
• Portable Multimedia Devices
• Notebooks