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LM4667ITL-LM4667ITLX-LM4667MM-LM4667MMX
Filterless High Efficiency 1.3W Switching Audio Amplifier
LM4667
Filterless High Efficiency 1.3W Switching Audio
Amplifier
General DescriptionThe LM4667isa 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
LM4667 processes analog inputs witha delta-sigma modu-
lation technique that lowers output noise and THD when
comparedto conventional pulse width modulators.
The LM4667is 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 2.7Vto 5.5V.
The LM4667 has high efficiency withan8Ω transducer load
comparedtoa typical ClassAB amplifier. Witha3V supply,
the IC’s efficiencyfora 100mW power levelis 74%, reaching
84%at 450mW output power.
The LM4667 featuresa low-power consumption shutdown
mode. Shutdown maybe enabledby drivingthe Shutdown
pintoa logic low (GND).
The LM4667 has fixed selectable gainof either 6dBor 12dB.
The LM4667 has short circuit protection againsta short from
the outputsto VDD, GND,or across the outputs.
Key Specifications Efficiencyat 3V, 100mW into8Ω transducer 74% (typ) Efficiencyat 3V, 450mW into8Ω transducer 84% (typ) Efficiencyat 5V, 1W into8Ω transducer 86% (typ) Total quiescent power supply current 3.5mA (typ) Total shutdown power supply current 0.01µA (typ) Single supply range 2.7Vto 5.5V
Features No output filter requiredfor inductive transducers Selectable gainof 6dBor 12dB Very fast turnon time: 5ms (typ) Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Short circuit protection Availablein space-saving micro SMD and MSOP
packages
Applications Mobile phones PDAs Portable electronic devices
Typical Application200405G5
FIGURE1. Typical Audio Amplifier Application CircuitSeptember 2004
LM4667
Filterless
High
Efficiency
1.3W
Switching
Audio
Amplifier
