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LM4805_0508 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4805_0508 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LM4805 Low Voltage High Power Audio Power Amplifier General Description The LM4805 is a boosted audio power amplifier designed for driving 8ohm speakers in portable applications. It delivers at least 1W continuous power to an 8 Ω load from any input voltage between 3V and 4.6V with less than 2% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4805 does not require boot- strap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high power and minimal size. The LM4805 features a low-power consumption shutdown mode along with an internal thermal shutdown protection mechanism and short circuit protection. The LM4805 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4805 is unity-gain stable and can be configured by external gain-setting resis- tors. Key Specifications j Quiescent Power Supply Current (V DD = 3V) 14mA (typ) j Output Power (V DD = 3.0V, RL =8 Ω, THD+N = 2%) 1W (typ) j Shutdown Current 2µA (max) Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 2µA (max) shutdown current n Low, 14mA (typ) quiescent current n Unity-gain stable n External gain configuration capability Applications n Cellphone n PTT (Push To Talk) mobile phones Connection Diagrams LM4805LQ (5x5) LQ Marking 20126284 Top View Order Number LM4805LQ See NS Package Number LQA28A 20126256 Top View U = Wafer Fab Z = Assembly Plant Code XY = Date Code TT = Die Run Code Boomer® is a registered trademark of National Semiconductor Corporation. August 2005 © 2005 National Semiconductor Corporation DS201262 www.national.com |
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