LM48410 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Low EMI, Filterless, 2.3W Stereo Class D Audio Power Amplifier with National 3D Enhancement

LM48410
www.ti.com
SNAS403E – FEBRUARY 2007 – REVISED MAY 2013
LM48410
Low EMI, Filterless, 2.3W Stereo Class D Audio
Power Amplifier with 3D Enhancement
Check for Samples: LM48410
FEATURES
1
•2 Selectable Spread Spectrum Mode Reduces
EMI
• Output Short Circuit Protection
• Stereo Class D Operation
• No Output Filter Required
• 3D Enhancement
• Logic Selectable Gain
• Independent Channel Shutdown Controls
• Minimum External Components
• Click and Pop Suppression
• Micro-Power Shutdown
• Available in Space-Saving 4mm x 4mm WQFN
Package
APPLICATIONS
• Mobile Phones
• PDAs
• Laptops
KEY SPECIFICATIONS
• Quiescent Power Supply Current at 3.6V
supply 4mA
• Power Output at V_DD = 5V, R_L = 4Ω, THD ≤ 10%
2.3W (typ)
• Power Output at V_DD = 5V, R_L = 8Ω, THD ≤ 10%
1.5W (typ)
• Shutdown current 0.03μA (typ)
• Efficiency at 3.6V, 100mW into 8Ω 80% (typ)
• Efficiency at 3.6V, 500mW into 8Ω 85% (typ)
• Efficiency at 5V, 1W into 8Ω 86% (typ)
DESCRIPTION
The LM48410 is a single supply, high efficiency,
2.3W/channel, filterless switching audio amplifier. A
low noise PWM architecture eliminates the output
filter, reducing external component count, board area
consumption, system cost, and simplifying design. A
selectable spread spectrum modulation scheme
suppresses RF emissions, further reducing the need
for output filters.
The LM48410 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 2.3W/channel of
continuous output power to a 4Ω load with less than
10% THD+N. Flexible power supply requirements
allow operation from 2.4V to 5.5V. The LM48410
offers two logic selectable modulation schemes, fixed
frequency mode, and an EMI reducing spread
spectrum mode.
The LM48410 features high efficiency compared with
conventional Class AB amplifiers. When driving an
8Ω speaker from a 3.6V supply, the device operates
with 85% efficiency at P_O = 500mW/Ch. Four gain
options are pin selectable through the G0 and G1
pins. The LM48410 also includes 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.
Independent left/right shutdown controls maximizes
power savings in mixed mono/stereo applications.
1
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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.
Copyright © 2007–2013, Texas Instruments Incorporated