The LM4890 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8? BTL load with less than 1% distortion (THD+N) from a 5V_DC power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4890 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.

The LM4890 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic low. Additionally, the LM4890 features an internal thermal shutdown protection mechanism.

The LM4890 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions.

The LM4890 is unity-gain stable and can be configured by external gain-setting resistors.

• Available in Space-Saving Packages: DSBGA, VSSOP, SOIC, and WSON
• Ultra Low Current Shutdown Mode
• BTL Output Can Drive Capacitive Loads
• Improved Pop & Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions
• 2.2 - 5.5V Operation
• No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required
• Thermal Shutdown Protection
• Unity-Gain Stable
• External Gain Configuration Capability

Key Specifications

• PSRR at 217Hz, VDD = 5V (Fig. 1): 62dB(typ.)
• Power Output at 5.0V & 1% THD: 1W(typ.)
• Power Output at 3.3V & 1% THD: 400mW(typ.)
• Shutdown Current: 0.1μA(typ.)

All trademarks are the property of their respective owners.

• Audio input type
• Analog Input
• Architecture
• Class-AB
• Speaker channels (Max)
• Mono
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2.2
• Load (Min) (ohms)
• 8
• Output power (W)
• 1.2
• SNR (dB)
• 93
• THD + N @ 1 kHz (%)
• 0.1
• Iq (Typ) (mA)
• 5
• Control interface
• Hardware
• Closed/open loop
• Closed
• Analog supply (Min) (V)
• 2.2
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 66
• Operating temperature range (C)
• -40 to 85

LM4890的完整型号有：LM4890M/NOPB、LM4890MM/NOPB、LM4890MMX/NOPB、LM4890MX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM4890M/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LM4890M/NOPB的批量USD价格：.576（1000+）

LM4890MM/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LM4890MM/NOPB的批量USD价格：.576（1000+）

LM4890MMX/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LM4890MMX/NOPB的批量USD价格：.48（1000+）

LM4890MX/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LM4890MX/NOPB的批量USD价格：.48（1000+）

LM4890 PSpice Model

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