圣邦微电子

SGM4918 80mW, Capless, Stereo Headphone Amplifier with Shutdown

GENERAL DESCRIPTION

The SGM4918 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4918 uses capless architecture to produce aground-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 SGM4918B, the gain is set internally (-2V/V), further reducing component count. For SGM4918A, the gain can be adjusted by external feedback resistors.

The SGM4918 delivers up to 80mW per channel into a 32Ω load and has low 0.03% 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 SGM4918 operates from a single 2.7V to 5.1V supply, consumes only 5.8mA supply current, has short-circuit and thermal-overload protections, and is specified over the extended -40 to +85 temperature range. The SGM4918 is available in a Green TDFN-3×3-10L package.


PIN CONFIGURATIONS


FEATURES

• SGM4918A: External Feedback Gain Network
    SGM4918B: 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
• 80mW into 32Ω Load from 5V Power Supply at
    THD+N = 0.1% (TYP, per Channel)
• Low 0.03% THD+N
• High PSRR (-78dB at 217Hz)
• Integrated Click-and-Pop Suppression
• 2.7V to 5.1V Single Supply Operation
• Low Quiescent Current (5.8mA at VDD = 5V)
• Shutdown Control
• Short-Circuit and Thermal-Overload Protections
• Undervoltage Lockout Function
• -40
 to +85 Operating Temperature Range
• Available in Green TDFN-3×3-10L Package

APPLICATIONS

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


ORDERING INFORMATION

Part Number Status Package Pins Pb-Free Temp Range
SGM4918AYD10G/TR Production TDFN-3×3-10L 10 Y -40℃ to +85℃ Samples
SGM4918BYD10G/TR Production TDFN-3×3-10L 10 Y -40℃ to +85℃ Samples

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