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LM4670SD
Filterless High Efficiency 3W Switching Audio Amplifier
LM4670
Filterless High Efficiency 3W Switching Audio Amplifier
General DescriptionThe LM4670isa fully integrated single-supply high efficiency
switching audio amplifier.It featuresan innovative modulator
that eliminatestheLC output filter used with typical switching
amplifiers. Eliminatingthe output filter reduces external com-
ponent count, simplifies circuit design, and reduces board
area. The LM4670 processes analog inputs witha delta-
sigma modulation technique that lowers output noise and
THD when comparedto conventional pulse width modula-
tors.
The LM4670is designedto meet the demandsof mobile
phones and other portable communication devices. Operat-
ingona single 5V supply,itis capableof drivinga 4Ω
speaker loadata continuous average outputof 2.3W with
less than 1% THD+N.Its flexible power supply requirements
allow operation from 2.4Vto 5.5V.
The LM4670 has high efficiency with speaker loads com-
paredtoa typical ClassAB amplifier. Witha 3.6V supply
drivingan 8Ω speaker, the IC’s efficiency fora 100mW
power levelis 77%, reaching 88%at 600mW output power.
The LM4670 featuresa low-power consumption shutdown
mode. Shutdown maybe enabledby drivingthe Shutdown
pintoa logic low (GND).
The gainof the LM4670is externally configurable which
allows independent gain control from multiple sourcesby
summingthe signals.
Key Specifications Efficiencyat 3.6V, 100mW into8Ω speaker 77% (typ) Efficiencyat 3.6V, 600mW into8Ω speaker 88% (typ) Efficiencyat 5V, 1W into8Ω speaker 87% (typ) Quiescent current, 3.6V supply 4.8mA (typ) Total shutdown power supply current 0.01µA (typ) Single supply range 2.4Vto 5.5V
Features No output filter requiredfor inductive loads Externally configurable gain Very fast turnon time: 1.35ms (typ) Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Short circuit protection Availablein space-saving microSMD and LLP packages
Applications Mobile phones PDAs Portable electronic devices
Typical ApplicationFIGURE1. Typical Audio Amplifier Application Circuit
December 2004
LM4670
Filterless
High
Efficiency
Switching
Audio
Amplifier
