LM4805 Datasheet | National Semiconductor

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 8Ω 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 ponents. The LM4805 does not require bootstrap 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 resistors. Key Specifications j Quiescent Power Supply Current (VDD = 3V) j Output Power 14m A (typ) 1W (typ) 2µA (max) (VDD = 3.0V, RL = 8Ω, THD+N = 2%) j Shutdown Current Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 2µA (max) shutdown current n Low, 14m A (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 Top View U = Wafer Fab Z = Assembly Plant Code XY = Date Code TT = Die Run Code Top View Order Number LM4805LQ See NS Package Number LQA28A Boomer ® is a registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS201262 .national. Typical Application .. - Cf2 is optional. FIGURE 1. Typical Audio Amplifier Application Circuit .national. Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor...