LM4881 Datasheet | National Semiconductor

Description The LM4881 is a dual audio power amplifier capable of delivering 200 m W of continuous average power into an 8Ω load with 0.1% (THD) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents using surface mount packaging. Since the LM4881 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4881 features an externally controlled, low power consumption shutdown mode which is virtually clickless and popless, as well as an internal thermal shutdown protection mechanism. The unity-gain stable LM4881 can be configured by external gain-setting resistors. Key Specifications n THD at 1 k Hz at 125 m W continuous average output power into 8Ω n THD at 1 k Hz at 75 m W continuous average output power into 32Ω n Output power at 10% THD+N at 1 k Hz into 8Ω n Shutdown Current 0.1% (max) 0.02% (typ) 300 m W (typ) 0.7 µA (typ) Features n n n n n MSOP surface mount packaging Unity-gain stable External gain configuration capability Thermal shutdown protection circuitry No bootstrap capacitors, or snubber circuits are necessary Applications n Headphone Amplifier n Personal puters n Microphone Preamplifier Typical Application Connection Diagrams MSOP Package DS100005-2 SOP and DIP Package DS100005-1 - Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors. DS100005-38 FIGURE 1. Typical Audio Amplifier Application Circuit Top View Order Number LM4881MM, LM4881M, or LM4881N See NS Package Number MUA08A, M08A, or N08E Boomer ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS100005 .national. Absolute Maximum Ratings (Note 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability...