• SGM4917A: External Feedback Gain Network SGM4917B: 

  Fixed -2V/V Gain

• No Bulky DC-Blocking Capacitors Required

• Ground-Referenced Outputs Eliminate DC-Bias Voltage 

  on Headphone Ground Pin

• No Degradation of Low-Frequency Response Due to 

  Output Capacitors

• Differential Inputs for Enhanced Noise Cancellation

• 80mW into 32Ω Load from 5V Power Supply at THD+N = 0.1% 

  (TYP, per Channel)

• Low 0.02% THD+N

• High PSRR (-78dB at 217Hz)

• Integrated Click-and-Pop Suppression

• 2.7V to 5.5V Single Supply Operation

• Low Quiescent Current (2.7mA at VDD = 5V)

• Shutdown Control

• Under-Voltage Lockout Function

• -40℃ to +85℃ Operating Temperature Range

• Available in Green TQFN-3×3-16L Package

The SGM4917 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4917 uses capless architecture to produce a ground-referenced output from a single power supply, eliminating the need for large DC-blocking capacitors for output, saving cost, board space, and component height. Additionally, for SGM4917B, the gain is set internally (-2V/V), further reducing component count. For SGM4917A, the gain can be adjusted by external feedback resistors.

The SGM4917 delivers up to 80mW per channel into a 32Ω load and has low 0.02% THD+N. A -78dB power supply rejection ratio (PSRR) at 217Hz allows this device to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and- pop circuitry suppresses audible clicks and pops on startup and shutdown.