LM4663 Datasheet | National Semiconductor

Description The LM4663 is a fully integrated single supply, high efficiency Class D audio power amplifier solution. The LM4663 utilizes a continuous time delta-sigma modulation technique that lowers output noise and THD when pared to conventional pulse width modulators. The LM4663 also features a stereo headphone amplifier that delivers 80m W into a 32Ω headset with less than 0.5% THD. The LM4663 has two stereo inputs that can be selected to drive either the headphone amplifier or the Class D amplifier. All amplifiers are protected with thermal shutdown. In standby mode, the LM4663 draws an extremely low 2µA supply current. With a 4Ω load, the IC’s efficiency for a 250m W power level is 69%, reaching 83% at a power level of 2W. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn-off. The LM4663 is available in a 24-lead TSSOP package, ideal for portable and desktop puter applications. n n n n n n Efficiency at 2 Watt into 4Ω Efficiency at 250m W into 4Ω Total quiescent power supply current Total shutdown power supply current THD+N 1k Hz, 20m W, 32Ω (Headphone) Single supply range 83% (typ) 69% (typ) 22m A (typ) 2µA (typ) 0.15% (typ) 4.5V to 5.5V Features n n n n n n Delta-sigma modulator. Two stereo input selector. “Click and pop” suppression circuitry. Micropower shutdown mode. 24 lead TSSOP package (No heatsink required). Stereo headphone amplifier. Applications n Portable puters n Desktop puters n Multimedia Monitors Key Specifications n PO at THD+N = 1% n THD+N at 1k Hz at 1 Watt into 4Ω (Power Amp) 2.1W (typ) 0.2% (typ) Block Diagram Connection Diagram TSSOP Package DS101269-2 DS101269-1 Top View Order Number LM4663MT See NS Package Number MTC24 (TSSOP Package) BOOMER™ is a trademark of National Semiconductor Corporation. © 2000 National Semiconductor Corporation DS101269 .national. Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the...