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LM4671ITL Datasheet

  • LM4671ITL

  • National Semiconductor [Filterless High Efficiency 2.5W Swi...

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  • NSC

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LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier
December 18, 2007
LM4671
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Filterless High Efficiency 2.5W Switching Audio Amplifier
General Description
The LM4671 is a single supply, high efficiency 2.5W switching
audio amplifier. A low noise, filterless PWM architecture elim-
inates the output filter, reducing external component count,
board area consumption, system cost, and simplifying design.
The LM4671 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 LM4671 has high efficiency with speaker loads compared
to a typical Class AB amplifier. With a 3V supply driving an
8鈩?speaker, the IC's efficiency for a 100mW power level is
80%, reaching 88% at 400mW output power.
The LM4671 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 LM4671 is externally configurable which al-
lows independent gain control from multiple sources by sum-
ming the signals.
Key Specifications
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Efficiency @ 3.6V, 100mW into
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speaker
80% (typ)
88% (typ)
86% (typ)
2.8mA (typ)
0.01碌A (typ)
2.4V to 5.5V
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Efficiency @ 3.6V, 400mW into
鈥冣€?8鈩?/div>
speaker
speaker
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Efficiency @ 5V, 1W into 8鈩?/div>
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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
Features
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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 microSMD package
Applications
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Mobile phones
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PDAs
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Portable electronic devices
Typical Application
201073j3
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer庐 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
201073
www.national.com

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