LM4871

ACTIVE

3-W, mono, analog input Class-AB audio amplifier

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Data sheet

document-pdfAcrobat LM4871 3W Audio Power Amplifier with Shutdown Mode datasheet (Rev. F)

LM4871

ACTIVE

Data sheet

Order now

Product details

Audio input type

Analog Input

Architecture

Class-AB

Speaker channels (max)

Mono

Control interface

Hardware

Output power (W)

3

Power stage supply (max) (V)

5.5

Power stage supply (min) (V)

2

THD + N at 1 kHz (%)

0.13

Load (min) (Ω)

3

Analog supply voltage (min) (V)

2

Analog supply voltage (max) (V)

5.5

Rating

Catalog

Operating temperature range (°C)

-40 to 85

Audio input type

Analog Input

Architecture

Class-AB

Speaker channels (max)

Mono

Control interface

Hardware

Output power (W)

3

Power stage supply (max) (V)

5.5

Power stage supply (min) (V)

2

THD + N at 1 kHz (%)

0.13

Load (min) (Ω)

3

Analog supply voltage (min) (V)

2

Analog supply voltage (max) (V)

5.5

Rating

Catalog

Operating temperature range (°C)

-40 to 85

VSSOP (DGK)

8

14.7 mm² (3 mm × 4.9 mm)

SOIC (D)

8

29.4 mm² (4.9 mm × 6 mm)

WSON (NGN)

8

16 mm² (4 mm × 4 mm)

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

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)

All trademarks are the property of their respective owners.

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

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)

All trademarks are the property of their respective owners.

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 micropower shutdown mode (I_Q = 0.6µA, typ) is activated when V_DD 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 section for further information concerning the LM4871LD, LM4871MM, LM4871M, and the LM4871N.

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 micropower shutdown mode (I_Q = 0.6µA, typ) is activated when V_DD 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 section for further information concerning the LM4871LD, LM4871MM, LM4871M, and the LM4871N.

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