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LM4890 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4890 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 31 page  LM4890 1 Watt Audio Power Amplifier General Description The LM4890 is an audio power amplifier primarily designed for demanding applications in mobile phones and other por- table communication device applications. It is capable of delivering 1 watt of continuous average power to an 8 Ω BTL load with less than 1% distortion (THD+N) from a 5V DC 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 appli- cations where minimal power consumption is a primary re- quirement. 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 ther- mal shutdown protection mechanism. 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. Key Specifications j PSRR at 217Hz, VDD = 5V (Fig. 1) 62dB(typ.) j Power Output at 5.0V & 1% THD 1W(typ.) j Power Output at 3.3V & 1% THD 400mW(typ.) j Shutdown Current 0.1µA(typ.) Features n Available in space-saving packages: micro SMD, MSOP, SOIC, and LLP n Ultra low current shutdown mode n BTL output can drive capacitive loads n Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n Thermal shutdown protection n Unity-gain stable n External gain configuration capability Applications n Mobile Phones n PDAs n Portable electronic devices Connection Diagrams 8 Bump micro SMD 8 bump micro SMD Marking 20019223 Top View Order Number LM4890IBP, LM4890IBPX See NS Package Number BPA08DDB 20019270 Top View X - Date Code T - Die Traceability G - Boomer Family E - LM4890IBP Boomer® is a registered trademark of National Semiconductor Corporation. May 2003 © 2003 National Semiconductor Corporation DS200192 www.national.com |
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