MP7731

5W - 30W Class D Mono

Bridged Audio Amplifier

MP7731 Rev. 1.8

www.MonolithicPower.com

1

9/25/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP7731 is a mono, 5W - 30W Class D Audio

Amplifier. It is one of MPS’ second generation of

fully integrated audio amplifiers which dramatically

reduces solution size by integrating the following:

Start Up / Shut Down Pop Elimination

Short Circuit Protection Circuits

180mΩ Power MOSFETs

Mute / Standby Mode

The MP7731 utilizes a full bridge output structure

capable of delivering 5W - 30W into 4

Ω

speakers. As in all other MPS Class D Audio

Amplifiers, this device exhibits the high fidelity

of a Class AB amplifier with an efficiency of

90%. The circuit is based on the MPS’ proprietary

variable frequency topology Analog Adaptive

Modulation (AAM

™, Patent No. 6,420,930; other

patents pending) that delivers excellent PSRR,

fast response time and operates on a single

power supply.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV0045

4.8cm x 3.0cm x 1.5cm

FEATURES

90% Efficiency at 5W

Amplifies Full Audio Range with Low THD+N

Typical = 0.1%

9.5V to 18V Supply Voltage Operation

Full Bridge Output Drive

4 Integrated 180mΩ Switches

Turn On / Turn Off Click and Pop Suppression

Integrated Short Circuit Protection

Integrated Thermal shutdown

Mute / Standby Mode

APPLICATIONS

• Flat Panel LCD and PDP Displays

• Notebook and Multimedia Computers

• Televisions

• Home Stereos

• DVD and VCD Players

• Game Devices and Systems

• Monitors

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

of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP7731

NC

PIN1

NIN1

AGND1

NC

EN1

NIN2

PIN2

AGND2

EN2

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

PGND1

SW1

VDD1

BS1

NC

PGND2

SW2

VDD2

BS2

NC

AUDIO IN+

+

-

+

EN

AUDIO IN-

50

20

10

5

2

1

0.5

0.2

0.1

0.05

0.02

0.01

100M

10

50

1

OUTPUT POWER (W)

THD+N vs Output Power

f=1kHz