The LM48310 is a single supply, high efficiency, mono, 2.6W, filterless switching audio
amplifier. The LM48310 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 LM48310 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 LM48310 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI
suppressing spread spectrum mode. 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
(THD+N = 0.03%) and high efficiency (η = 88%). The LM48310 also features a SYNC_IN input and
SYNC_OUT, which allows multiple devices to operate with the same switching frequency, eliminating
beat frequencies and any other interference caused by clock intermodulation.
The LM48310 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 LM48310 is internally set to
12dB, 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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