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 8Ω 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
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.
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