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LM4674A bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Filterless 2.5W Stereo Class D Audio Power Amplifier
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LM4674A bảng dữ liệu(HTML) 1 Page - Texas Instruments

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LM4674A
www.ti.com
SNAS366A – SEPTEMBER 2006 – REVISED MAY 2013
LM4674A
Filterless 2.5W Stereo Class D Audio Power
Amplifier
Check for Samples: LM4674A
1
FEATURES
DESCRIPTION
The LM4674A 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.
Logic Selectable Gain
Independent Shutdown Control
The LM4674A is designed to meet the demands of
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 Package
The LM4674A features high efficiency compared to
APPLICATIONS
conventional Class AB amplifiers. When driving an
8
Ω speaker from a 3.6V supply, the device features
Mobile Phones
85% efficiency at PO = 500mW. Four gain options are
PDAs
pin selectable through the GAIN0 and GAIN1 pins.
Laptops
Output short circuit protection prevents the device
from being damaged during fault conditions. Superior
KEY SPECIFICATIONS
click
and
pop
suppression
eliminates
audible
transients on power-up/down and during shutdown.
Efficiency at 3.6V, 100mW into 8
Ω 80% (typ)
Independent left/right shutdown controls maximizes
Efficiency at 3.6V, 500mW into 8
Ω 85% (typ)
power savings in mixed mono/stereo applications.
Efficiency at 5V, 1W into 8
Ω 85% (typ)
Quiescent Power Supply Current at 3.6V
Supply 4mA
Power Output at VDD = 5V, RL = 4Ω, THD ≤ 10%
2.5W (typ)
Power Output at VDD = 5V, RL = 8Ω, THD ≤ 10%
1.5W (typ)
Shutdown Current 0.1
μA (typ)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2013, 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.


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