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LM4670_06 Datasheet

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LM4670 Filterless High Efficiency 3W Switching Audio Amplifier
July 2006
LM4670
Filterless High Efficiency 3W Switching Audio Amplifier
General Description
The LM4670 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 external com-
ponent count, simplifies circuit design, and reduces board
area. The LM4670 processes analog inputs with a delta-
sigma modulation technique that lowers output noise and
THD when compared to conventional pulse width modula-
tors.
The LM4670 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?/div>
speaker load at a continuous average output of 2.3W with
less than 1% THD+N. Its flexible power supply requirements
allow operation from 2.4V to 5.5V.
The LM4670 has high efficiency with speaker loads com-
pared to a typical Class AB amplifier. With a 3.6V supply
driving an 8鈩?speaker, the IC鈥檚 efficiency for a 100mW
power level is 77%, reaching 88% at 600mW output power.
The LM4670 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 LM4670 is externally configurable which
allows independent gain control from multiple sources by
summing the signals.
Key Specifications
j
Efficiency at 3.6V, 100mW into 8鈩?speaker 77% (typ)
j
Efficiency at 3.6V, 600mW into 8鈩?speaker 88% (typ)
j
Efficiency at 5V, 1W into 8鈩?speaker
j
Quiescent current, 3.6V supply
j
Total shutdown power supply current
j
Single supply range
87% (typ)
4.8mA (typ)
0.01碌A (typ)
2.4V to 5.5V
Features
n
n
n
n
n
n
n
n
No output filter required for inductive loads
Externally configurable gain
Very fast turn on time: 1.35ms (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Short circuit protection
Available in space-saving microSMD and LLP packages
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
20089901
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS200899
www.national.com

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