LM48413_14 Datasheet, PDF (1/23 Pages) Texas Instruments – Audio Power Amplifier Series Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power Amplifier

LM48413
www.ti.com
SNAS460A – NOVEMBER 2008 – REVISED JANUARY 2009
LM48413 Boomer™ Audio Power Amplifier Series Ultra Low EMI, Filterless, 1.2W Stereo
Class D Audio Power Amplifier with E²S and Texas Instruments 3D Enhancement
Check for Samples: LM48413
FEATURES
1
•23 E²S System Reduces EMI Preserving Audio
Quality and Efficiency
• Output Short Circuit Protection
• Stereo Class D Operation
• No Output Filter Required
• Texas Instruments 3D Enhancement
• Minimum External Components
• Click and Pop Suppression
• Micro-Power Shutdown
• Available in Space-Saving Approximately 2mm
x 2.2mm DSBGA package
APPLICATIONS
• Mobile Phones
• PDAs
• Laptops
KEY SPECIFICATIONS
• Quiescent Power Supply Current at 3.6V
supply 4mA (Typ)
• Power Output at V_DD = 5V, R_L = 8Ω, THD ≤ 1%
1.2 W (Typ)
• Shutdown current 0.03µA (Typ)
• Efficiency at 3.6V, 100mW into 8Ω 80% (Typ)
• Efficiency at 3.6V, 500mW into 8Ω 80% (Typ)
• Efficiency at 5V, 1W into 8Ω 86% (Typ)
DESCRIPTION
The LM48413 is a single supply, high efficiency,
1.2W/channel, filterless switching audio amplifier. The
LM48413 features Texas Instruments' Enhanced
Emissions Suppression (E²S) system - a unique
patented ultra low EMI, spread spectrum, PWM
architecture. It significantly reduces RF emission
while preserving audio quality and efficiency. The E²S
system improves battery life, reduces external
component count, board area consumption, system
cost and product design cycle time. The LM48413TL
is available in a micro-SMD package, further saving
space.
The LM48413 is designed to meet the demands of
mobile phones and other portable communication
devices. Operating from a single 5V supply, the
device is capable of delivering 1.2W/channel of
continuous output power to a 8Ω load with less than
1% THD+N. Flexible power supply requirements
allow operation from 2.4V to 5.5V. The wide band
spread spectrum architecture of the LM48413
reduces EMI-radiated emissions due to the modulator
frequency.
The LM48413 features high efficiency compared with
conventional Class AB amplifiers. The E²S system
includes an advanced, patent-pending edge rate
control (ERC) architecture that further reduce
emissions by minimizing the high frequency
components of the device output, while maintaining
its high quality audio reproduction and high efficiency
(η = 85% at V_DD = 3.6V, P_O = 500mW). The LM48413
also includes Texas Instruments' 3D audio
enhancement that improves stereo sound quality. In
devices where the left and right speakers are in close
proximity, 3D enhancement affects channel
specialization, widening the perceived soundstage.
Output short circuit protection prevents the device
from being damaged during fault conditions. Superior
click and pop suppression eliminates audible
transients on power up/down and during shutdown.
Shutdown control also provided to maximizes power
savings.
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.
Boomer is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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.
Copyright © 2008–2009, Texas Instruments Incorporated