LM4665

LM4665 www.ti.com SNAS146E – FEBRUARY 2002 – REVISED MAY 2013 LM4665 Filterless High Efficiency 1W Switching Audio Amplifier Check for Samples: LM4665 FEATURES 1 2 No Output Filter Required for Inductive Transducers Selectable Gain of 6dB (2V/V) or 12dB (4V/V) Very Fast Turn On Time: 5ms (typ) User Selectable Shutdown High or Low Logic Level Minimum External Components "Click and Pop" Suppression Circuitry Micro-Power Shutdown Mode Short Circuit Protection DSBGA, WSON, and VSSOP Packages (No Heat Sink Required) APPLICATIONS Mobile Phones PDAs Portable Electronic Devices KEY SPECIFICATIONS Efficiency at 100mW into 8Ω Transducer 75%(typ) Efficiency at 400mW into 8Ω Transducer 80%(typ) Total Quiescent Power Supply Current (3V) 3mA(typ) Total Shutdown Power Supply Current (3V) 0.01µA(typ) Single Supply Range (VSSOP & WSON) 2.7V to 5.5V Single Supply Range (DSBGA) (Note 11) 2.7V to 3.8V DESCRIPTION The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4665 is designed to meet the demands of mobile phones and other portable commun...