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LM4666-LM4666SD-LM4666SDX
Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier
LM4666
Filterless High Efficiency Stereo 1.2W Switching Audio
Amplifier
General DescriptionThe LM4666isa fully integrated single-supply high efficiency
switching audio amplifier.It featuresan innovative modulator
that eliminatestheLC output filter used with typical switching
amplifiers. Eliminating the output filter reduces parts count,
simplifies circuit design, and reduces board area. The
LM4666 processes analog inputs witha delta-sigma modu-
lation technique that lowers output noise and THD when
comparedto conventional pulse width modulators.
The LM4666is designedto meet the demandsof mobile
phones and other portable communication devices. Operat-
ingona single3V supply,itis capableof driving8Ω trans-
ducer loadsata continuous average outputof 450mW with
less than 1%THD+N.Its flexible power supply requirements
allow operation from 2.8Vto 5.5V.
The LM4666 has high efficiency withan8Ω transducer load
comparedtoa typical ClassAB amplifier. Witha3V supply,
the IC’s efficiencyfora 100mW power levelis 79%, reaching
84%at 450mW output power.
The LM4666 featuresa low-power consumption shutdown
mode. Shutdown maybe enabledby drivingthe Shutdown
pintoa logic low (GND).
The LM4666 has fixed selectable gainof either 6dBor 12dB.
The LM4666 has short circuit protection againsta short from
the outputsto VDDor GND.
Key Specifications Efficiencyat 3V, 100mW into8Ω transducer 79% (typ) Efficiencyat 3V, 450mW into8Ω transducer 84% (typ) Efficiencyat 5V, 1W into8Ω transducer 85% (typ) Total quiescent power supply current 7.0mA (typ) Total shutdown power supply current 0.02µA (typ) Single supply range 2.8Vto 5.5V
Features No output filter requiredfor inductive transducers Selectable gainof 6dBor 12dB Very fast turnon time: 6ms (typ) Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Short circuit protection Availablein space-saving SDA package
Applications Mobile phones PDAs Portable electronic devices
Typical Application200558E6
FIGURE1. Typical Audio Amplifier Application CircuitMay 2004
LM4666
Filterless
High
Efficiency
Stereo
1.2W
Switching
Audio
Amplifier
