1FEATURES
23• Passes FCC Class B Radiated Emissions with
20 Inches of Cable
• E2S System Reduces EMI While Preserving
Audio Quality and Efficiency
• Output Short Circuit Protection with Auto-
Recovery
• No Output Filter Required
• Improved Audio Quality
• Minimum External Components
• Five Logic Selectable Gain Settings (0, 3, 6, 9,
12dB)
• Low Power Shutdown Mode
• Click and Pop Suppression
• Available in Space-Saving DSBGA Package

APPLICATIONS
• Mobile Phones
• PDAs
• Laptops

KEY SPECIFICATIONS
• Efficiency at 3.6V, 400mW into 8Ω, 84% (Typ)
• Efficiency at 5V, 1W into 8Ω, 88% (Typ)
• Quiescent Power Supply Current at 5V, 3.1mA
• Power Output at VDD = 5V, RL = 4Ω
– THD+N ≤ 10%, 2.6W (Typ)
– THD+N ≤ 1%, 2.1W (Typ)
• Power Output at VDD = 5V, RL = 8Ω
– THD+N ≤ 10%, 1.6W (Typ)
– THD+N ≤ 1%, 1.3W (Typ)
• Shutdown Current, 0.01μA (Typ)

DESCRIPTION
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.