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 VDD = 3.6V, PO = 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.
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