LM4667, LM4667MMBD
www.ti.com SNAS165C – SEPTEMBER 2003 – REVISED MAY 2013 LM4667 Filterless High Efficiency 1.3W Switching Audio
Amplifier
Check for Samples: LM4667, LM4667MMBD FEATURES DESCRIPTION The LM4667 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
LM4667 processes analog inputs with a delta-sigma
modulation technique that lowers output noise and
THD when compared to conventional pulse width
modulators. 1 2 No Output Filter Required for Inductive
Transducers
Selectable Gain of 6dB or 12dB
Very Fast Turn on Time: 5ms (typ)
Minimum External Components
"Click and Pop" Suppression Circuitry
Micro-Power Shutdown Mode
Short Circuit Protection
Space-Saving DSBGA and VSSOP Packages KEY SPECIFICATIONS Efficiency at 3V, 100mW into 8О© Transducer
74% (typ)
Efficiency at 3V, 450mW into 8О© Transducer …
