LM4670
www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 LM4670 Boomer™ Audio Power Amplifier Series Filterless High Efficiency 3W Switching
Audio Amplifier
Check for Samples: LM4670 FEATURES DESCRIPTION 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.
Eliminating the output filter reduces external
component count, simplifies circuit design, and
reduces board area. The LM4670 processes analog
inputs with a delta-sigma modulation technique that
lowers output noise and THD when compared to
conventional pulse width modulators. 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, …
