The LM4906 is an audio power amplifier primarily designed for demanding applications in
mobile phones and other portable communication device applications. It is capable of delivering 1W
of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a +5V power
The LM4906 is the first Texas Instruments Boomer Power Amplifier that does not require an
external PSRR bypass capacitor. The LM4906 also has an internal selectable gain of either 6dB or
12dB. In addition, no output coupling capacitors or bootstrap capacitors are required which makes
the LM4906 ideally suited for cell phone and other low voltage portable applications.
The LM4906 contains advanced pop and click circuitry that eliminates noise, which would
otherwise occur during turn-on and turn-off transitions.
Boomer audio power amplifiers were designed specifically to provide high quality output
power with a minimal amount of external components. The LM4906 features a low -power consumption
shutdown mode (the part is enabled by pulling the SD pin high). Additionally, the LM4906 features
an internal thermal shutdown protection mechanism.
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