The LM4898 is a fully differential 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 LM4898 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 LM4898 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 select pin to be driven in a likewise manner to enable
Shutdown. Additionally, the LM4898 features an internal thermal shutdown protection mechanism.
The LM4898 contains advanced pop and click circuitry which virtually eliminates noises
which would otherwise occur during turn-on and turn-off transitions.
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