MP7745

2 x 20W Class D Stereo

Single Ended Audio Amplifer

MP7745 Rev. 0.9

www.MonolithicPower.com

1

5/11/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP7745 is a Stereo 2 x 20W Class D

Audio Amplifier. It is one of MPS’ products of

fully

integrated

audio

amplifiers

which

dramatically reduces solution size by integrating

the following:

250mΩ power MOSFETs

Startup / Shutdown pop elimination

Short circuit protection circuits

The MP7745 utilizes a single ended output

structure capable of delivering 20W per channel

into 4Ω speakers. 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.

FEATURES

• THD+N = 0.05% at 1W, 8Ω

• Low Noise (103µV Typical)

• Switching Frequency Up to 1MHz

• 9.5V to 26V Operation from a Single Supply

• Integrated Startup and Shutdown Pop

Elimination Circuit

• Thermal and Short Circuit Protection

• Integrated Power FETs

• Pin Compatible with MP7722 and MP7742

• Available in TSSOP20-Exposed Package

APPLICATIONS

• Flat Panel TV

• Portable Docking Stations

• Surround Sound DVD Systems

• Televisions

• Multimedia Computers

• Home Stereo Systems

“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

MP7745

BS1

SW1

BS2

SW2

REF1

CH1

INPUT

CH1

OUTPUT

CH2

OUTPUT

IN1

REF2

IN2

EN2

EN1

AGND2

AGND1

PGND2

PGND1

VDD2

CH2

INPUT

EN/SHDN

VDD1

2

18

17

19

12

14

13

3

8

7

6

10

4, 5

9

20

15

0.1

0.2

0.5

1

2

5

10

20

0.01

0.02

0.05

P

(W)

40

12

5

10

20