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LM4665 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce LM4665
Description  Filterless High Efficiency 1W Switching Audio Amplifier
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Fabricant  NSC [National Semiconductor (TI)]
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Filterless High Efficiency 1W Switching Audio Amplifier
General Description
The LM4665 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
LM4665 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4665 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 400mW with
less than 2%THD+N.
The LM4665 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 75%, reaching
80% at 400mW output power.
The LM4665 features a low-power consumption shutdown
mode. Shutdown may be enabled by either a logic high or
low depending on the mode selection. Connecting the Shut-
down Mode pin to either V
DD (high) or GND (low) enables
the Shutdown pin to be driven in a likewise manner to
activate shutdown.
The LM4665 has fixed selectable gain of either 6dB or 12dB.
The LM4665 has short circuit protection against a short from
the outputs to V
DD, GND or across the outputs.
Key Specifications
j Efficiency at 100mW into 8
Ω transducer
j Efficiency at 400mW into 8
Ω transducer
j Total quiescent power supply current (3V)
j Total shutdown power supply current (3V) 0.01µA(typ)
j Single supply range (MSOP & LD)
2.7V to 5.5V
j Single supply range (ITL) (Note 11)
2.7V to 3.8V
No output filter required for inductive transducers
Selectable gain of 6dB (2V/V) or 12dB (4V/V)
Very fast turn on time: 5ms (typ)
User selectable shutdown High or Low logic level
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Short circuit protection
micro SMD, LLP, and MSOP packages (no heat sink
Mobile phones
Portable electronic devices
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit
December 2002
© 2002 National Semiconductor Corporation

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Datasheet Download

Numéro de composants électroniques

Numéro de pièceDescription des composantsHtml ViewFabricant
LM4664Filterless High Efficiency 1.1W Switching Audio Amplifier 1 2 3 4 5 MoreNational Semiconductor (TI)
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LM4666Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier 1 2 3 4 5 MoreNational Semiconductor (TI)
LM4670Filterless High Efficiency 3W Switching Audio Amplifier 1 2 3 4 5 MoreNational Semiconductor (TI)
SSM2301Filterless High Efficiency Mono 1.4 W Class-D Audio Amplifier 1 2 3 4 5 MoreTexas Instruments
SSM2302Filterless High Efficiency Class-D Stereo Audio Amplifier 1 2 3 4 5 MoreAnalog Devices
MJE170Low Power Audio Amplifier Low Current High Speed Switching Applications 1 2 3 4 5 Fairchild Semiconductor
MJE180Low Power Audio Amplifier Low Current High Speed Switching Applications 1 2 3 4 Fairchild Semiconductor
KSA910Driver Stage Of Audio Amplifier & High Voltage Switching Applications 1 2 3 4 Fairchild Semiconductor

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