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LM4850MM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4850MM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 20 page LM4850 Mono 1.5 W / Stereo 300 mW Power Amplifier General Description The LM4850 is an audio power amplifier capable of deliver- ing 1.5W (typ) of continuous average power into a mono 4 Ω bridged-tied load (BTL) with 1% THD+N or 95mW per chan- nel of continuous average power into stereo 32 Ω single-ended (SE) loads with 1% THD+N, using a 5V power supply. The LM4850 can automatically switch between mono BTL and stereo SE modes utilizing a headphone sense pin. It is ideal for any system that provides both a monaural speaker output and a stereo line or headphone output Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4850 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4850 features an externally controlled, micropower consumption shutdown mode and thermal shutdown protec- tion. The unity-gain stable LM4850’s gain is set by external gain-setting resistors Note 1: An LM4850LD that has been properly mounted to a circuit board will deliver 1.9W into 3 Ω (at 1% THD+N). The other package options for the LM4850 will deliver 1.1W into 8 Ω (at 1% THD+N). See Application Infor- mation sections for further information concerning the LM4850LD, LM4850MM, and LM4850MT. Key Specifications n Output Power at 1% THD+N, 1kHz: n LM4850LD 3 Ω BTL 1.9W (typ) n LM4850LD 4 Ω BTL 1.7W (typ) n LM4850MM, MT 4 Ω BTL 1.5W (typ) n LM4850LD, MM, MT 8 Ω BTL 1.1W (typ) n LM4850LD, MM, MT 8 Ω SE 300mW (typ) n LM4850LD, MM, MT 32 Ω SE 95mW (typ) n THD+N at 1kHz, 95mW into 32 Ω SE 1% (typ) n Single Supply Operation 2.4 to 5.5V n Shutdown Current 44µA (typ) Features n Mono 1.5W BTL or stereo 300mW output n Headphone sense n “Click and pop” suppression circuitry n No bootstrap capacitors required n Thermal shutdown protection n Unity-gain stable n LLP, TSSOP, and MSOP packaging Applications n Portable computers n Desktop computers n PDA’s n Handheld games Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20001031 FIGURE 1. Typical Audio Amplifier Application Circuit July 2002 © 2002 National Semiconductor Corporation DS200010 www.national.com |
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