MP7748

2x20W Stereo Single Ended

Class D Audio Amplifier

MP7748 Rev. 1.0

www.MonolithicPower.com

1

1/28/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP7748 is a Class D Audio Amplifier for

driving

stereo

speakers

in

single-ended

configuration or a mono speaker in bridge-tied-

load configuration. It is fully integrated audio

amplifier which dramatically reduces solution

size by integrating the following:

•

250mΩ power MOSFETs

•

Startup / Shutdown pop elimination

•

Short circuit protection circuits

The MP7748 is capable of delivering 20W per

channel into 4Ω speaker in single-ended output

structure, or delivering 50W into 6Ω speaker in

bridge-tied-load output structure under 24V

VDD. MPS Class D Audio Amplifiers exhibit the

high fidelity of a Class A/B amplifier at high

efficiencies. The circuit is based on the MPS’

proprietary variable frequency topology that

delivers excellent linearity, fast response time

and operates on a single power supply.

MP7748

features

programmable

VDD

shutdown

voltage

for

each

channel

by

controlling the UVP node voltage. The default

VDD shutdown (rising threshold) voltage is 8.4V

if the UVP pin is NC.

FEATURES

•

Output Power at 24V VDD and 10%

THD+N

• Stereo SE configuration: 20W per channel

into 4Ω load

• Mono BTL configuration: 50W into 6Ω

load

•

THD+N = 0.02% at 1W, 8Ω(SE)

•

Low Noise (103µV with SE configuration,

140µV with BTL configuration)

•

Switching Frequency Up to 1MHz

•

9.5V to 36V Operation from a Single

Supply

•

Integrated Startup and Shutdown Pop

Elimination Circuit

•

Programmable UVP

•

Thermal and Short Circuit Protection

•

Integrated Power FETs

•

Available in TSSOP28-Exposed Package

APPLICATIONS

•

Portable Docking Stations

•

Surround Sound DVD Systems

•

Televisions

•

Flat Panel Monitors

•

Multimedia Computers

•

Home Stereo Systems

For MPS green status, please visit MPS website under Quality Assurance.

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

AAM (Analog Adaptive Modulation) is a Trademark of Monolithic Power

Systems, Inc.

TYPICAL APPLICATION

0.01

20

0.02

0.05

0.1

0.2

0.5

10

5

2

1

60m

35

100m

1

10