LM4673_15 Datasheet, PDF (1/28 Pages) Texas Instruments – Filterless, 2.65W, Mono, Class D Audio Power

LM4673, LM4673SDBD, LM4673TMBD
www.ti.com
SNAS317D – DECEMBER 2005 – REVISED MAY 2013
LM4673
Filterless, 2.65W, Mono, Class D Audio Power
Amplifier
Check for Samples: LM4673, LM4673SDBD, LM4673TMBD
FEATURES
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•2 Mono Class D Operation
• No Output Filter Required for Inductive Loads
• Externally Configurable Gain
• Very Fast Turn On Time: 17μs (typ)
• Minimum External Components
• "Click and Pop" Suppression Circuitry
• Micro-Power Shutdown Mode
• Available in Space-Saving 0.4mm Pitch
DSBGA and WSON Packages
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Efficiency at 3.6V, 400mW into 8Ω Speaker
88% (typ)
• Efficiency at 3.6V, 100mW into 8Ω Speaker
80% (typ)
• Efficiency at 5V, 1W into 8Ω Speaker 86% (typ)
• Quiescent Current, 3.6V Supply 2.1mA (typ)
• Total Shutdown Power Supply Current
0.01µA (typ)
• Single Supply Range 2.4V to 5.5V
• PSRR, f = 217Hz 78dB
DESCRIPTION
The LM4673 is a single supply, high efficiency,
2.65W, mono, Class D audio amplifier. A low noise,
filterless PWM architecture 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. Operating on a single 5V supply, it is
capable of driving a 4Ω speaker load at a continuous
average output of 2.1W with less than 1% THD+N. Its
flexible power supply requirements allow operation
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 8Ω 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 allows independent gain control from multiple
sources by summing the signals. Output short circuit
and thermal overload protection prevent the device
from damage during fault conditions.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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