The LM4901 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 and 1.6 watts of continuous avearge power to a
4Ω 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 LM4901 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 LM4901 features a low-power consumption shutdown mode. To facilitate this, Shutdown
may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode
pin either high or low enables the shutdown pin to be driven in a likewise manner to enable
The LM4901 contains advanced pop and click circuitry which eliminates noise which would
otherwise occur during turn-on and turn-off transitions.
The LM4901 is unity-gain stable and can be configured by external gain-setting resistors.
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