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SGM4917
80mW, Capless, Stereo Headphone Amplifier with Shutdown
80mW, Capless, Stereo Headphone Amplifier with Shutdown
GENERAL DESCRIPTION

The SGM4917 is stereo headphone amplifier which is designed for portable applications and can operate from a 2.7V to 5.5V single supply. Capless design can produce a ground-referenced output from a single power supply, and can eliminate output DC-blocking capacitors for less-component height and low-cost. For SGM4917B, the internal gain setting (-2V/V) is to further reduce component count. For SGM4917A, the gain can be adjusted by external feedback resistors.

The SGM4917 has low quiescent current 2.7mA at 5V supply, low 0.02% THD+N, 80mW per channel into 32Ω load from 5V power supply at THD+N = 0.1%. The high supply rejection ratio (PSRR) of -78dB at 217Hz allows the device to operate from noisy digital supplies without an additional linear regulator. The device provides short-circuit and thermal-overload protections. Build-in shutdown control also helps for pop/click-free on/off control.

The SGM4917 is available in a Green TQFN-3×3-16L package. It operates over an ambient temperature range of -40 to +85.

PIN CONFIGURATIONS

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FEATURES
  • Supply Voltage Range: 2.7V to 5.5V

  • SGM4917A: External Feedback Gain Network

    SGM4917B: Fixed -2V/V Gain

  • Capless Structure

    Eliminates Ground-Referenced Outputs

    Eliminates Output DC-Blocking Capacitors

    Provides Flat Frequency Response

  • 80mW into 32Ω Load from 5V Power Supply at THD+N = 0.1% (Typical, per Channel)

  • THD+N = 0.02% (f = 1kHz)

  • High PSRR: -78dB (at 217Hz)

  • Quiescent Current: 2.7mA (TYP)

  • Shutdown Control

  • Short-Circuit and Thermal-Overload Protections

  • Under-Voltage Lockout Function

  • Enhanced Noise Cancellation by Differential Inputs

  • -40 to +85 Operating Temperature Range

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

APPLICATIONS

Smart Phones

Portable Audio Equipment

Notebook PCs

PDAs

ORDERING INFORMATION
Part Number Status Package Pins Pb-Free Temp Range
SGM4917AYTQ16G/TR Production TQFN-3×3-16L 16 Y -40℃ to +85℃ Samples
SGM4917BYTQ16G/TR Production TQFN-3×3-16L 16 Y -40℃ to +85℃ Samples