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LM4673TMX Datasheet

  • LM4673TMX

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  • NSC

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LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier
November 1, 2007
LM4673
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Filterless, 2.65W, Mono, Class D Audio Power Amplifier
General Description
The LM4673 is a single supply, high efficiency, 2.65W, mono,
Class D audio amplifier. A low noise, filterless PWM architec-
ture eliminates the output filter, reducing external component
count, board area consumption, system cost, and simplifying
design.
The LM4673 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 5V supply, it is capable of driving a 4鈩?speaker
load at a continuous average output of 2.1W with less than
1% THD+N. Its flexible power supply requirements allow op-
eration from 2.4V to 5.5V.
The LM4673 has high efficiency with speaker loads compared
to a typical Class AB amplifier. With a 3.6V supply driving an
8鈩?speaker, the IC's efficiency for a 100mW power level is
80%, reaching 88% at 400mW output power.
The LM4673 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The gain of the LM4673 is externally configurable which al-
lows independent gain control from multiple sources by sum-
ming the signals. Output short circuit and thermal overload
protection prevent the device from damage during fault con-
ditions.
Key Specifications
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Efficiency at 3.6V, 400mW into 8鈩?speaker
88% (typ)
80% (typ)
86% (typ)
2.1mA (typ)
0.01碌A (typ)
2.4V to 5.5V
78dB
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Efficiency at 3.6V, 100mW into 8鈩?speaker
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Efficiency at 5V, 1W into 8鈩?speaker
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Quiescent current, 3.6V supply
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Total shutdown power supply current
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Single supply range
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PSRR, f = 217Hz
Features
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Mono Class D Operation
No output filter required for inductive loads
Externally configurable gain
Very fast turn on time: 17渭s (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Available in space-saving 0.4mm pitch micro SMD and
LLP
Tm
packages
Applications
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Mobile phones
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PDAs
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Portable electronic devices
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
201522
www.national.com

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