LM4889 Description:
LM4889是一款音频功率放大器，主要设计用于移动电话和其他便携式通信设备应用中的高要求应用。
LM4889具有低功耗关机模式，通过以逻辑低电平驱动关机引脚来实现。
LM4889包含先进的弹出和点击电路，以消除在开启和关闭转换过程中可能出现的噪声。
LM4889是单位增益稳定的，可以通过外部增益设置电阻器进行配置。
The LM4889 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 8Ω BTL load with less than 2% distortion (THD+N) from a 5VDC power supply.
Boomer™ audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4889 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 LM4889 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with a logic low. Additionally, the LM4889 features an internal thermal shutdown protection mechanism.
The LM4889 contains advanced pop & click circuitry to eliminate noise which would otherwise occur during turn-on and turn-off transitions.
The LM4889 is unity-gain stable and can be configured by external gain-setting resistors.
LM4889 Features:
Available in Space-Saving VSSOP, SOIC,WSON, and DSBGA Packages
Ultra Low Current Shutdown Mode (3.3 to 2.6V- 0.01µA)
Can Drive Capacitive Loads up to 500 pF
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
Unity-Gain Stable
External Gain Configuration Capability
LM4889 Applications:
Mobile Phones
PDAs
Portable Electronic Devices
LM4889 Key Specifications:
Improved PSRR at 217Hz, 5-3.3V 75dB
Power Output at 5.0V & 2% THD 1.0W(typ.)
Power Output at 3.3V & 1% THD 400mW(typ.)
Shutdown Current at 3.3 & 2.6V 0.01µA(typ.)
LM4889 Typical Application:
LM4889 Connection Diagram:
LM4889 Higher Gain Audio Amplifier:
Differential Amplifier Configuration for LM4889:
