LM49150, LM49150TLEVAL

www.ti.com

SNAS439B – AUGUST 2008 – REVISED MARCH 2009

LM49150

Mono Class D Audio Subsystem with Earpiece

Driver and Stereo Ground Referenced Headphone Amplifiers

Check for Samples: LM49150, LM49150TLEVAL

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FEATURES

DESCRIPTION

The LM49150 is a fully integrated audio subsystem

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•

designed for portable handheld applications such as

•

Ground Referenced Headphone Outputs —

cellular phones. Part of TI's PowerWise™ product

Eliminates Output Coupling Capacitors

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 Earpiece Amplifier

•

Flexible Output for Speaker and Headphone

amplifier,

135mW

Class

AB

earpiece

amplifier,

Output

42mW/channel stereo ground reference headphone

•

20–Bump DSBGA Package

amplifiers, volume control, and mixing circuitry into a

single device.

•

Soft Enable Function

The filterless class D amplifier delivers 1.25W into an

•

“Click and Pop” Suppression Circuitry

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•

Thermal Shutdown Protection

class D amplifier features a patented, ultra low EMI

•

Low Supply Current

PWM architecture that significantly reduces RF

•

Micro-Power Shutdown

emissions

while

preserving

audio

quality.

The

42mW/channel

headphone

drivers

feature

TI’s

ground referenced architecture that creates a ground-

APPLICATIONS

referenced output from a single supply, eliminating

•

Mobile Phones

the need for bulky and expensive DC-blocking

•

PDAs

capacitors, saving space and minimizing cost.

•

Portable Electronics

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

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).

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

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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.

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PowerWise is a trademark of Texas Instruments.

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All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.