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SGM4917

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

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.

PIN CONFIGURATIONS

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FEATURES
  • 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

APPLICATIONS

Notebook PCs

Cellular Phones

PDAs

MP3 Players

Smart Phones

Portable Audio Equipment

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

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