Texas Instruments LM4674 Evaluation Module LM4674TLBD LM4674TLBD Datenbogen
Produktcode
LM4674TLBD
SNAS344E – DECEMBER 2005 – REVISED APRIL 2013
LM4674
Filterless 2.5W Stereo Class D Audio Power
Amplifier
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FEATURES
DESCRIPTION
The LM4674 is a single supply, high efficiency,
2
•
Output Short Circuit Protection
2.5W/channel, filterless switching audio amplifier. A
•
Stereo Class D Operation
low noise PWM architecture eliminates the output
•
No Output Filter Required
filter, reducing external component count, board area
consumption, system cost, and simplifying design.
consumption, system cost, and simplifying design.
•
Logic Selectable Gain
•
Independent Shutdown Control
The LM4674 is designed to meet the demands of
mobile phones and other portable communication
mobile phones and other portable communication
•
Minimum External Components
devices. Operating from a single 5V supply, the
•
Click and Pop Suppression
device is capable of delivering 2.5W/channel of
•
Micro-Power Shutdown
continuous output power to a 4
Ω
load with less than
10% THD+N. Flexible power supply requirements
•
Available in Space-Saving 2mm x 2mm x
allow operation from 2.4V to 5.5V.
0.6mm DSBGA, and 4mm x 4mm x 0.8mm
WQFN Packages
WQFN Packages
The LM4674 features high efficiency compared to
conventional Class AB amplifiers. When driving an
conventional Class AB amplifiers. When driving an
APPLICATIONS
8
Ω
speaker from a 3.6V supply, the device features
85% efficiency at P
O
= 500mW. Four gain options are
•
Mobile Phones
pin selectable through the G0 and G1 pins.
•
PDAs
Output short circuit protection prevents the device
•
Laptops
from being damaged during fault conditions. Superior
click
click
and
pop
suppression
eliminates
audible
KEY SPECIFICATIONS
transients on power-up/down and during shutdown.
Independent left/right shutdown control maximizes
Independent left/right shutdown control maximizes
•
Efficiency at 3.6V, 100mW into 8
Ω
: 80% (typ)
power savings in mixed mono/stereo applications.
•
Efficiency at 3.6V, 500mW into 8
Ω
: 85% (typ)
•
Efficiency at 5V, 1W into 8
Ω
: 85% (typ)
•
Quiescent Power Supply Current
at 3.6V supply: 4mA
•
Power Output at V
DD
= 5V,
R
L
= 4
Ω
, THD
≤
10%: 2.5 W (typ)
•
Shutdown Current: 0.03
μ
A (typ)
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.