1FEATURES
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 VDD = 3.3V THD+N ≤ 1%
– LS Mode, RL = 8Ω 520mW (Typ)
– HP Mode, R L = 32Ω 40mW (Typ)
• Output Power at VDD = 5V THD+N ≤ 1%
– LS Mode, RL = 8Ω 1.25W (Typ)
– HP Mode, RL = 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.