1FEATURES
23• E2S Class D Amplifier
• Ground Referenced Headphone Outputs —
Eliminates Output Coupling Capacitors
• I2C Volume and Mode Control
• Mono Earpiece Amplifier
• Flexible Output for Speaker and Headphone
Output
• 20–Bump DSBGA Package
• Soft Enable Function
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection
• Low Supply Current
• Micro-Power Shutdown

KEY SPECIFICATIONS
• Output power at V DD = 5V:
– Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.25W
(typ)
– Headphone: RL = 32Ω SE, THD+N ≤ 1%:
42mW (typ) ground–
Earpiece: R L = 8Ω SE, THD+N ≤ 1%: 135mW
(typ)
• Output power at VDD = 3.3V:
– Speaker: RL = 8Ω BTL, THD+N ≤ 1%:
520mW (typ)
– Headphone: RL = 32Ω BTL, THD+N ≤ 1%:
42mW (typ)
– Earpiece: R L = 8Ω SE, THD+N ≤ 1%: 35mW
(typ)
• Output Offset
– LS Mode: 9mV (typ)
– HP Mode: 1mV (typ)
– Earpiece: 1mV (typ)
• Single Supply Operation (V DD): 2.7 to 5.5V
• I2C Single Supply Operation: 1.7 to 5.5V

APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronics

DESCRIPTION
The LM49150 is a fully integrated audio subsystem
designed for portable handheld applications such as
cellular phones. Part of TI's PowerWise™ product
family, the LM49150 consumes very low power in the
various modes of operation and still providing great
audio performance. The LM49150 combines a 1.25W
mono E2S (Enhanced Emission Suppression) class D
amplifier, 135mW Class AB earpiece amplifier,
42mW/channel stereo ground reference headphone
amplifiers, volume control, and mixing circuitry into a
single device.
The filterless class D amplifier delivers 1.25W into an
8Ω load with <1% THD+N with a 5V supply. The E2S
class D amplifier features a patented, ultra low EMI
PWM architecture that significantly reduces RF
emissions while preserving audio quality. The
42mW/channel headphone drivers feature TI’s
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 cost.
The LM49150 features a fully differential mono input,
and two single-ended stereo inputs. The three inputs
can be mixed/multiplexed to either the speaker or
headphone amplifiers. Each input channel has an
independent, 32-step digital volume control. The
headphone output stage features an additional, 8-
step gain control, while the speaker output stage has a selectable 6dB or 12dB gain. The mixer, volume
control and device mode select are controlled through
an I2C compatible serial interface.
The LM49150’s superior click and pop suppression
eliminates audible transients on power-up/down and
during shutdown. The LM49150 is available in a ultra-
small 20-bump DSBGA package (2.225mm X
2.644mm).