The LM4871 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3? 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 3? (at 10% THD). The other package options for the LM4871 will deliver 1.5W into 8? (at 10% THD). See the section for further information concerning the LM4871LD, LM4871MM, LM4871M, and the LM4871N.

• 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: 3? , 4? Loads; 3W (typ), 2.5 W (typ)
  • All other LM4871 Packages: 8? 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 8? 0.5% (max)

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• Audio input type
• Analog Input
• Architecture
• Class-AB
• Speaker channels (Max)
• Mono
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2
• Load (Min) (ohms)
• 3
• Output power (W)
• 3
• THD + N @ 1 kHz (%)
• 0.13
• Iq (Typ) (mA)
• 6.5
• Control interface
• Hardware
• Closed/open loop
• Closed
• Analog supply (Min) (V)
• 2
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 60
• Operating temperature range (C)
• -40 to 85

LM4871的完整型号有：LM4871LD/NOPB、LM4871M、LM4871M/NOPB、LM4871MM/NOPB、LM4871MMX/NOPB、LM4871MX、LM4871MX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM4871LD/NOPB，工作温度：-40 to 85，封装：WSON (NGN)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM4871LD/NOPB的批量USD价格：.513（1000+）

LM4871M，工作温度：-40 to 85，封装：SOIC (D)-8，包装数量MPQ：95个，MSL 等级/回流焊峰值温度：Level-1-235C-UNLIM，引脚镀层/焊球材料：SNPB，TI官网LM4871M的批量USD价格：.718（1000+）

LM4871M/NOPB，工作温度：-40 to 85，封装：SOIC (D)-8，包装数量MPQ：95个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4871M/NOPB的批量USD价格：.616（1000+）

LM4871MM/NOPB，工作温度：-40 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4871MM/NOPB的批量USD价格：.616（1000+）

LM4871MMX/NOPB，工作温度：-40 to 85，封装：VSSOP (DGK)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4871MMX/NOPB的批量USD价格：.513（1000+）

LM4871MX，工作温度：-40 to 85，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-235C-UNLIM，引脚镀层/焊球材料：SNPB，TI官网LM4871MX的批量USD价格：.616（1000+）

LM4871MX/NOPB，工作温度：-40 to 85，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4871MX/NOPB的批量USD价格：.513（1000+）

LM4871 TINA-TI Reference Design

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