LM4870 Datasheet | National Semiconductor

Description The LM4870 is a bridge-connected audio power amplifier capable of delivering 1.1W of continuous average power to an 8Ω load with less than 0.5% THD+N over the audio spectrum from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external ponents. Since the LM4870 does not require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4870 features an externally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. It also includes two headphone control inputs and a headphone sense output for external monitoring. The LM4870 is unity-gain stable and the gain is set using external resistors. Key Specifications n THD+N at 1W into 8Ω n Output power into 8Ω at 1k Hz at 10%THD+N n Shutdown Current 0.5% (max) 1.5W (typ) 0.6µA (typ) Features n No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary n Small Outline (SOIC) power packaging n Unity-gain stable n External gain configuration capability Applications n Personal puters n Desktop puters n Low voltage audio system Typical Application Connection Diagram Small Outline Package DS100094-2 Top View Order Number LM4870M See NS Package Number M16A DS100094-1 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS100094 .national. Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec.) 6.0V - 65˚C...