LM48411 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio Power Amplifier with E2S

LM48411
www.ti.com
SNAS399G – SEPTEMBER 2007 – REVISED MAY 2013
LM48411
Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D
Audio Power Amplifier with E²S
Check for Samples: LM48411
FEATURES
1
•2 E²S System Reduces EMI Preserving Audio
Quality and Efficiency
• Output Short Circuit Protection
• Stereo Class D Operation
• No Output Filter Required for Inductive Loads
• Logic Selectable Gain
• Independent Shutdown Control
• Minimum External Components
• "Click and Pop" Suppression Circuitry
• Micro-Power Shutdown Mode
• Available in Space-Saving 0.5mm Pitch
DSBGA Package
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Efficiency at 3.6V, 500mW into 8Ω Speaker:
87% (typ)
• Efficiency at 3.6V, 100mW into 8Ω Speaker:
80% (typ)
• Efficiency at 5V, 1W into 8Ω Speaker:
88% (typ)
• Quiescent Current, 3.6V Supply: 4.2mA (typ)
• Power Output at V_DD = 5V R_L = 4Ω, THD ≤ 10%:
2.5W (typ)
• Power Output at V_DD = 5V R_L = 8Ω, THD ≤ 10%:
1.5W (typ)
• Total Shutdown Power Supply Current:
0.01µA (typ)
• Single Supply Range: 2.4V to 5.5V
DESCRIPTION
The LM48411 is a single supply, high efficiency,
2.5W/channel Class D audio amplifier. The LM48411
features TI's Enhanced Emissions Suppression (E²S)
system, that features a unique patent-pending ultra
low EMI, spread spectrum, PWM architecture, that
significantly reduces RF emissions while preserving
audio quality and efficiency. The E²S system
improves battery life, reduces external component
count, board area consumption, system cost, and
simplifying design.
The LM48411 is designed to meet the demands of
mobile phones and other portable communication
devices. Operating on a single 5V supply, it is
capable of delivering 2.5W/channel of continuous
output power to a 4Ω load with less than 10%
THD+N. Its flexible power supply requirements allow
operation from 2.4V to 5.5V. The wide band spread
spectrum architecture of the LM48411 reduces EMI-
radiated emissions due to the modulator frequency.
The LM48411 features high efficiency compared to a
conventional Class AB amplifier. The E²S system
includes an advanced, patent-pending edge rate
control (ERC) architecture that further reduce
emissions by minimizing the high frequency
component of the device output, while maintaining
high quality audio reproduction and high efficiency (η
= 87% at V_DD = 3.6V, P_O = 500mW). Four gain
options are pin selectable through GAIN0 and GAIN1
pins.
The LM48411 features a low-power consumption
shutdown mode. Shutdown may be enabled by
driving the Shutdown pin to a logic low (GND).
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 control 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.
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