Texas Instruments LM4670
The LM4670 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 LM4670 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.| Part No. | LM4670 |
|---|---|
| Datasheet | LM4670 Download |
| Manufacturer |  Texas Instruments |
| Description | Filterless High Efficiency 3W Switching Audio Amplifier |
| Buy | Stock & Price |
FEATURES
1●23 No Output Filter Required for Inductive Loads
● Externally Configurable Gain
● Very Fast Turn on Time: 1.35ms (Typ)
● Minimum External Components
● "Click and Pop" Suppression Circuitry
● Micro-Power Shutdown Mode
● Short Circuit Protection
● Available in Space-Saving DSBGA and WSON Packages
APPLICATIONS
● Mobile Phones● PDAs
● Portable Electronic Devices KEY SPECIFICATIONS
● Efficiency at 3.6V, 100mW into 8Ω Speaker, 77% (Typ)
● Efficiency at 3.6V, 600mW into 8Ω Speaker, 88% (Typ)
● Efficiency at 5V, 1W into 8Ω Speaker, 87% (Typ)
● Quiescent Current, 3.6V Supply, 4.8mA (Typ)
● Total Shutdown Power Supply Current, 0.01µA (Typ)
● Single Supply Range, 2.4 to 5.5V
DESCRIPTION
Eliminating the output filter reduces external component count, simplifies circuit design, and reduces board area. The LM4670 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.3W with less than 1% THD+N.
