LM49151 Datasheet, PDF (1/34 Pages) National Semiconductor (TI) – Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No Clip with Clip Control

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LM49151
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SNAS482F – MARCH 2009 – REVISED MARCH 2013
LM49151 Boomer™ Audio Power Amplifier Series Mono Class D Audio Subsystem with
Earpiece Driver, Ground Referenced Headphone Amplifiers, Speaker Protection and No
Clip with Clip Control
Check for Samples: LM49151
FEATURES
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•23 E²S Class D Amplifier
• Ground Referenced Outputs — Eliminates
Output Coupling Capacitors
• I²C Programmable No Clip Function with Clip
Control
• Voltage Limiter Speaker Protection
• I²C Volume and Mode Control
• Ear Piece Amplifier
• Advanced Click-and-Pop Suppression
• Low Supply Current
• Micro-Power Shutdown
• 20-bump DSBGA Package
APPLICATIONS
• Mobile Phones
• PDAs
• Notebook PCs
• Portable Electronics Devices
• MP3 Players
KEY SPECIFICATIONS
• Output Power at V_DD = 3.3V THD+N ≤ 1%
– LS Mode, R_L = 8Ω 520mW (Typ)
– HP Mode, R_L = 32Ω 40mW (Typ)
• Output Power at V_DD = 5V THD+N ≤ 1%
– LS Mode, R_L = 8Ω 1.25W (Typ)
– HP Mode, R_L = 32Ω 42mW (Typ)
• Output Offset
– LS Mode 15 6mV (Typ)
– HP Mode 15 2mV (Typ)
DESCRIPTION
The LM49151 is a fully integrated audio subsystem
designed for portable handheld applications such as
cellular phones. The LM49151 combines a 1.25W
mono E²S class D amplifier, 125mW Class AB
earpiece driver, 42mW/channel stereo ground
referenced headphone drivers, volume control, input
mixer/multiplexer, and speaker protection into a
single device.
The LM49151 class D speaker amplifier features
Texas Instruments' unique Automatic Level Control
(ALC) that provides both a I²C programmable no-clip
feature with Clip Controls and speaker protection.
The E²S (Enhanced Emission Suppression) class D
amplifier features a patented, ultra low EMI PWM
architecture that significantly reduces RF emissions
while preserving audio quality and efficiency while
delivering 1.25W into an 8Ω load with <1% THD+N
with a 5V supply. The 42mW/channel headphone
drivers feature Texas Instruments' ground referenced
architecture that creates a ground-referenced output
from a single supply, eliminating the need for bulky
and expensive DC-blocking capacitors, saving space
and minimizing system cost.
The LM49151 features separate volume controls for
the loudspeaker and headphone inputs. Mode
selection, shutdown control, and volume are
controlled through an I²C compatible interface. The
LM49151's superior click and pop suppression
eliminates audible transients on power-up/down and
during shutdown.
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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.
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All other trademarks are the property of their respective owners.
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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 © 2009–2013, Texas Instruments Incorporated