The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio
amplifier. The LM48312 features TI’s Enhanced Emissions Suppression
(E2S) system, that features a unique patented 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, and system cost, simplifying design.
The LM48312 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 LM48312 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 LM48312 features high efficiency compared to conventional Class AB amplifiers, and
other low EMI Class D amplifiers. When driving an 8Ω speaker from a 5V supply, the device operates
with 88% efficiency at PO = 1W. The LM48312 features five gain settings,
selected through a single logic input, further reducing solution size. 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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