LM48312_15 Datasheet, PDF (1/22 Pages) Texas Instruments – Boomer Audio Power Amplifier Series 2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power Amplifier with E2S

LM48312
www.ti.com
SNAS494D – JANUARY 2010 – REVISED MAY 2013
LM48312 Boomer™ Audio Power Amplifier Series 2.6W, Ultra-Low EMI, Filterless, Mono
Class D Audio Power Amplifier with E²S
Check for Samples: LM48312
FEATURES
1
•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 V_DD = 5V, R_L = 4Ω
– THD+N ≤ 10%, 2.6W (Typ)
– THD+N ≤ 1%, 2.1W (Typ)
• Power Output at V_DD = 5V, R_L = 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 P_O = 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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Boomer is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2013, Texas Instruments Incorporated