LM4671中文资料具有可从外部配置的增益的 2.5W 单声道、模拟输入 D 类扬声器放大器数据手册TI规格书

描述 Description

The LM4671 is a single supply, high efficiency 2.5W switching audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. The LM4671 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.The LM4671 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 88% at 400mW output power. The LM4671 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND). The gain of the LM4671 is externally configurable which allows independent gain control from multiple sources by summing the signals.

特性 Features

• No Output Filter Required for Inductive Loads
• Very Fast Turn On Time: 17μs (typ)
• \"Click and pop\" Suppression Circuitry
• Available in Space-Saving DSBGA Package
• Efficiency @ 3.6V, 100mW into 8Ω Speaker: 80 % (typ)
• Efficiency @ 5V, 1W into 8Ω Speaker: 86 % (typ)
• Total Shutdown Power Supply Current: 0.01 µA (typ)
• Single Supply Range: 2.4 to 5.5 V