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SGM4891

1.2W Audio Power Amplifier
 
1.2W Audio Power Amplifier
GENERAL DESCRIPTION

The SGM4891 is a 1.2W, fully integrated, audio power amplifier. It is designed to maximize audio performance in portable applications such as mobile phone. The portable application requires audio power amplifier has minimum of external components and can operate from a single 2.5V to 5.5V power supply. SGM4891 is capable of delivering 1.2W of continuous output power with typically 1% distortion (THD+N) when it drives an 8Ω speaker from a 5.0V power supply.

The SGM4891 features a low power consumption shutdown mode, which is achieved by driving the shutdown pin with a logic low. Additionally, the SGM4891 features an internal thermal shutdown protection mechanism.

The SGM4891 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.

For maximum flexibility, the SGM4891 provides an externally controlled gain (with resistors), as well as an externally controlled turn-on time (with the bypass capacitor). When using a 1μF bypass capacitor, it offers 145ms wake-up time when V+ is equal to 5.0V.

The SGM4891 is available in a Green TDFN-2×2-8L package. It operates over an ambient temperature range of -40 to +85.

PIN CONFIGURATIONS

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FEATURES
  • Ideal for Notebook Computers, PDAs, and Other Small Portable Audio Devices

  • 1.2W into 8Ω BTL Load from 5V Supply at THD+N = 1% (TYP)

  • Excellent PSRR: Direct Connection to Battery

  • Fast Turn-On Time

  • Unity Gain Stable

  • 2.5V to 5.5V Operation

  • Shutdown Current: 0.02μA (TYP)

  • Shutdown Pin is Compatible with 1.8V Logic

  • -40 to +85 Operating Temperature Range

  • Available in a Green TDFN-2×2-8L Package

APPLICATIONS

Portable Systems

MP3 Players

Mobile Phone

PDAs

GPS

ORDERING INFORMATION
Part NumberStatusPackagePinsPb-FreeTemp Range
SGM4891YDE8G/TRProductionTDFN-2×2-8L8Y-40℃ to +85℃

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