SGMICRO SGM4917AYTQ16G/TR

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°C to +85°C 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°C to +85°C Operating Temperature Range
• Available in a Green TQFN-3×3-16L Package

• Notebook PCs
• Cellular Phones
• PDAs
• MP3 Players
• Smart Phones
• Portable Audio Equipment