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LM4804 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4804 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  LM4804 Low Voltage High Power Audio Power Amplifier General Description The LM4804 integrates a Boost Converter with an Audio Power Amplifier to drive voice coil speakers in portable applications. When powered by a 3V supply, it is capable of creating 1.8W power dissipation in an 8 Ω bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4804 does not require boot- strap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4804 features a micro-power shutdown mode. Addi- tionally, the LM4804 features an internal thermal shutdown protection mechanism. The LM4804 contains advanced pop & click circuitry that eliminates output transients which would otherwise occur during power or shutdown cycles. The LM4804 is unity-gain stable. Its closed-loop gain is determined by the value of external, user selected resistors. Key Specifications j Quiescent Power Supply Current (V DD = 4.2V, RL =8 Ω) 11mA (typ) j BTL Output Power (R L =8 Ω, 2% THD+N, V DD = 3V) 1.8W (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, 11mA (typ) quiescent current (V DD = 4.2V, RL = 8 Ω) n 1.8W mono BTL output, R L =8 Ω,V DD =3V n Short circuit protection n Unity-gain stable n External gain configuration capability Applications n Cellphone n PDA Connection Diagrams LM4804LQ (5x5) LQ Marking 20116784 Top View Order Number LM4804LQ See NS Package Number LQA28A 20116737 Top View U = Wafer Fab Code Z = Assembly Plant Code XY = Date Code TT = Die Run Code Boomer® is a registered trademark of National Semiconductor Corporation. March 2005 © 2005 National Semiconductor Corporation DS201167 www.national.com |
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