MP7740 – 15W CLASS D MONO SINGLE ENDED AUDIO AMPLIFIER

MP7740 Rev. 0.9

www.MonolithicPower.com

4

9/22/2009

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PIN FUNCTIONS

Pin #

Name

Description

1

PIN

Amplifier Positive Input. PIN is the positive side of the differential input to the amplifier. Use a

2

NIN

Amplifier Negative Input. NIN is the negative side of the differential input to the amplifier. Drive

the input signal and close the feedback loop at NIN. See Figure 1.

3

AGND Analog Ground. Connect AGND to PGND at a single point.

4

EN

Enable Input. Drive EN high to turn on the amplifier, low to turn it off.

5

BS

High-Side MOSFET Bootstrap Input. A capacitor from BS to SW supplies the gate drive

current to the internal high-side MOSFET.

6

VDD

Power Supply Input. VDD is the drain of the high-side MOSFET switch, and supplies the

power to the output stage and the MP7740 internal control circuitry. In addition to the main

bulk capacitor, bypass VDD to PGND with a 1µF X7R capacitor placed close to pins 6 and 8.

7

SW

Switched Power Output. SW is the output of the MP7740. Connect the LC filter between SW

and the output coupling capacitor. See Figure 1.

8

PGND Power Ground. Connect PGND to AGND at a single point.

Exposed

Pad

Connect exposed pad to GND plane for proper thermal performance.