Part # LM4890 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4890 Boomer ® Audio Power Amplifier Series 1 Watt Audio Power Amplifier


Part Details:

LM4890 July 2006 1 LM4890 Watt 1 Watt Audio Power AmplifierGeneral Description Key Specifications Audio The LM4890 is an audio power amplifier primarily designed j PSRR at 217Hz, V = 5V (Fig. 1) 62dB(typ.) DD for demanding applications in mobile phones and other por-table communication device applications. It is capable of j Power Output at 5.0V & 1% THD 1W(typ.) delivering 1 watt of continuous average power to an 8 BTL j Power Output at 3.3V & 1% THD 400mW(typ.) Power load with less than 1% distortion (THD+N) from a 5VDC j Shutdown Current 0.1µA(typ.) power supply. Boomer audio power amplifiers were designed specifically toprovide high quality output power with a minimal amount of Features Amplifier external components. The LM4890 does not require output n Available in space-saving packages: micro SMD, MSOP, coupling capacitors or bootstrap capacitors, and therefore is SOIC, and LLP ideally suited for mobile phone and other low voltage appli- n Ultra low current shutdown mode cations where minimal power consumption is a primary re- n BTL output can drive capacitive loads quirement. n Improved pop & click circuitry eliminates noises during The LM4890 features a low-power consumption shutdown turn-on and turn-off transitions mode, which is achieved by driving the shutdown pin with n 2.2 - 5.5V operation logic low. Additionally, the LM4890 features an internal ther- n No output coupling capacitors, snubber networks or mal shutdown protection mechanism. bootstrap capacitors required The LM4890 contains advanced pop & click circuitry which n Thermal shutdown protection eliminates noises which would otherwise occur during n Unity-gain stable turn-on and turn-off transitions. n External gain configuration capability The LM4890 is unity-gain stable and can be configured byexternal gain-setting resistors. Applicationsn Mobile Phones n PDAs n Portable electronic devices


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LM4890.pdf Datasheet