Texas Instruments LM4666
The LM4666 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. The LM4666 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.| Part No. | LM4666 |
|---|---|
| Datasheet | LM4666 Download |
| Manufacturer |  Texas Instruments |
| Description | Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier |
| Buy | Stock & Price |
FEATURES
1●2 No Output Filter Required for Inductive Transducers
● Selectable Gain of 6dB or 12dB
● Very Fast Turn On Time: 6ms (typ)
● Minimum External Components
● "Click and Pop" Suppression Circuitry
● Micro-Power Shutdown Mode
● Short Circuit Protection
● Available in Space-Saving NHK0014A Package
APPLICATIONS
● Mobile Phones● PDAs
● Portable Electronic Devices KEY SPECIFICATIONS
● Efficiency at 3V, 100mW into 8Ω Transducer: 79% (typ)
● Efficiency at 3V, 450mW into 8Ω Transducer: 84% (typ)
● Efficiency at 5V, 1W into 8Ω Transducer: 85% (typ)
● Total Quiescent Power Supply Current: 7.0mA (typ)
● Total Shutdown Power Supply Current: 0.02µA (typ)
● Single supply range: 2.8V to 5.5V
DESCRIPTION
Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4666 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 450mW with less than 1%THD+N.
