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LM4666 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

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Numéro de pièce LM4666
Description  Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier
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Fabricant  NSC [National Semiconductor (TI)]
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Filterless High Efficiency Stereo 1.2W Switching Audio
General Description
The LM4666 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
LM4666 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4666 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 3V supply, it is capable of driving 8
Ω trans-
ducer loads at a continuous average output of 450mW with
less than 1%THD+N. Its flexible power supply requirements
allow operation from 2.8V to 5.5V.
The LM4666 has high efficiency with an 8
Ω transducer load
compared to a typical Class AB amplifier. With a 3V supply,
the IC’s efficiency for a 100mW power level is 79%, reaching
84% at 450mW output power.
The LM4666 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The LM4666 has fixed selectable gain of either 6dB or 12dB.
The LM4666 has short circuit protection against a short from
the outputs to V
DD or GND.
Key Specifications
j Efficiency at 3V, 100mW into 8
Ω transducer 79% (typ)
j Efficiency at 3V, 450mW into 8
Ω transducer 84% (typ)
j Efficiency at 5V, 1W into 8
Ω transducer
85% (typ)
j Total quiescent power supply current
7.0mA (typ)
j Total shutdown power supply current
0.02µA (typ)
j Single supply range
2.8V to 5.5V
No output filter required for inductive transducers
Selectable gain of 6dB or 12dB
Very fast turn on time: 6ms (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Short circuit protection
Available in space-saving SDA package
Mobile phones
Portable electronic devices
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit
May 2004
© 2004 National Semiconductor Corporation

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