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          80mW, Capless, Stereo Headphone Amplifier with Shutdown
          80mW, Capless, Stereo Headphone Amplifier with Shutdown

          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.

          The SGM4917 operates from a single 2.7V to 5.5V supply, consumes only 2.7mA supply current, and is specified over the extended -40 to +85 temperature range. The SGM4917 is available in a Green TQFN-3×3-16L package.



          • 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


          Notebook PCs

          Cellular Phones


          MP3 Players

          Smart Phones

          Portable Audio Equipment

          Part NumberStatusPackagePinsPb-FreeTemp Range
          SGM4917AYTQ16G/TRProductionTQFN-3×3-16L16Y-40℃ to +85℃
          SGM4917BYTQ16G/TRProductionTQFN-3×3-16L16Y-40℃ to +85℃