The LM48311 is a single supply, high efficiency, mono, 2.6W, filterless switching audio
amplifier. The LM48311 features Texas Instruments' 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 LM48311 is designed to meet the demands of portable multimedia devices. Operating
from a single 5V supply, the device is capable of delivering 2.6W 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 LM48311 features both a spread spectrum modulation scheme, and an advanced, patented edge
rate control (ERC) architecture that significantly reduces emissions, while maintaining high
quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%).
The LM48311 features high efficiency compared to conventional Class AB amplifiers, and
other low EMI Class D amplifiers. When driving and 8Ω speaker from a 5V supply, the device operates
with 88% efficiency at PO = 1W. The gain of the LM48311 is internally set to
6dB, further reducing external component count. A low power shutdown mode reduces supply current
consumption to 0.01µA.
Advanced output short circuit protection with auto-recovery prevents the device from
being damaged during fault conditions. Superior click and pop suppression eliminates audible
transients on power-up/down and during shutdown.
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