集成电路LM4898MM

1 Watt Fully Differential Audio Power Amplifier With

Shutdown Select

General Description

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 & click circuitry which

virtually eliminates noises which would otherwise occur during turn-on and turn-off transitions.

Key Specifications j Improved PSRR at 217Hz 83dB(typ) j Power Output at 5.0V & 1% THD 1.0W(typ) j Power Output at 3.3V & 1% THD 400mW(typ) j Shutdown Current 0.1μA(typ) Features n Fully differential amplification n Available in space-saving packages micro SMD, MSOP, and LLP n Ultra low current shutdown mode n Can drive capacitive loads up to 500pF n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.4 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n Shutdown high or low selectivity Applications n Mobile phones n PDAs n Portable electronic devices

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