Texas Instruments LM4665
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. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.| Part No. | LM4665 |
|---|---|
| Datasheet | LM4665 Download |
| Manufacturer |  Texas Instruments |
| Description | Filterless High Efficiency 1W Switching Audio Amplifier |
| Buy | Stock & Price |
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
Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 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 400mW with less than 2%THD+N.
