MP7731
5W - 30W Class D Mono
Bridged Audio Amplifier
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 4Ω
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.
FEATURES
30W into 4Ω with V
DD
= 16.5V
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
EVALUATION BOARD REFERENCE
Board Number
EV0045
Dimensions
4.8cm x 3.0cm x 1.5cm
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
THD+N vs Output Power
V
CC
20
19
18
17
16
15
14
13
12
11
MP7731
1
2
NC
PIN1
NIN1
AGND1
NC
EN1
NIN2
PIN2
AGND2
EN2
PGND1
SW1
VDD1
BS1
NC
PGND2
SW2
VDD2
BS2
NC
+
V
CC
AUDIO IN+
3
4
5
6
-
V
CC
V
CC
+
AUDIO IN-
7
8
9
EN
10
V
CC
50
f=1kHz
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
100M
1
THD+N (%)
10
50
OUTPUT POWER (W)
MP7731 Rev. 1.8
9/25/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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