LM4871: 3W Audio Power Amplifier with Shut down Mode

LM4871: 3W Audio Power Amplifier with Shut down Mode

The LM4871 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (see Note). To conserve power in portable applications, the LM4871's micro power shutdown mode (IQ = 0.6µA, typ) is activated when VDD is applied to the SHUTDOWN pin.

Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.0V to 5.5V. Since the LM4871 does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is ideally suited for low-power portable systems that require minimum volume and weight.

Additional LM4871 features include thermal shutdown protection, unity-gain stability, and external gain set.

Note: An LM4871LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4871 will deliver 1.5W into 8Ω (at 10% THD). See the Application Information section for further information concerning the LM4871LD, LM4871MM, LM4871M, and the LM4871N.

 

Features

  • No Output Coupling Capacitors, Bootstrap Capacitors, or Snubber Circuits Required
  • Unity-gain Stable
  • WSON, VSSOP, SOIC, or PDIP Packaging
  • External Gain Configuration Capability
  • Pin Compatible with the LM4861

Applications

  • Portable Computers
  • Desktop Computers
  • Low Voltage Audio Systems

 

KEY SPECIFICATIONS

  • PO at 10% THD+N, 1kHz
  • LM4871LD: 3Ω , 4Ω Loads; 3W (typ), 2.5 W (typ)
  • All other LM4871 Packages: 8Ω load 1.5 W (typ)
  • Shutdown Current 0.6μA (typ)
  • Supply Voltage Range 2.0V to 5.5 V
  • THD at 1kHz at 1W Continuous Average Output Power into 8Ω 0.5% (max)

 

Image Part # Manufacturer Description Stock Price Buy
XC6221D13A7R-G
Torex Semiconductor Ltd.
200MA HIGH SPEED LDO REGULATOR
54300
Min : 5000
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Detail
XC6221C4827R-G
Torex Semiconductor Ltd.
200MA HIGH SPEED LDO REGULATOR
50355
Min : 5000
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IHLP5050FDER5R6M01
Vishay/Dale
FIXED IND 5.6UH 13.5A 10 MOHM
51273
Min : 1
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S-1335D25-N4T1U3
ABLIC U.S.A. Inc.
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56243
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ABLIC U.S.A. Inc.
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61843
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Toshiba Semiconductor and Storage
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65734
Min : 10000
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61668
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