LM4890 - 1 瓦音频功率放大器

LM4890是TI德州仪器公司的一款扬声器放大器（AB类/D类）产品，LM4890是1 瓦音频功率放大器，本站介绍了LM4890的封装应用图解、特点和优点、功能等，并给出了与LM4890相关的TI元器件型号供参考。

LM4890 - 1 瓦音频功率放大器 - 扬声器放大器（AB类/D类） - 低功耗放大器 - 德州仪器

产品描述

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 5VDC 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.

产品特性

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.)

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