MP7745DF datasheet(5/13 Pages) MPS

5 / 13 page

MP7745 – 2 x20 W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER

MP7745 Rev. 0.9

www.MonolithicPower.com

5/11/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PIN FUNCTIONS

Pin #

Name

Description

1, 11, 16

No Connect. Not internally connected

REF1

Amplifier 1 Reference. REF1 is the reference point for amplifier 1. Use a resistive voltage

divider to set the voltage at REF1 to VDD/2.

IN1

Amplifier 1 Input. IN1 is the inverting input for amplifier 1.

4, 5

AGND1

Analog Ground 1. Connect AGND1 to AGND2.

EN1

Enable Input 1. EN1 must be connected to EN2. Drive EN1 high to enable MP7745; low to

disable it.

IN2

Amplifier 2 Input. IN2 is the inverting input for amplifier 2.

REF2

Amplifier 2 Reference. REF2 is the reference point for amplifier 2. Use a resistive voltage

divider to set the voltage at REF2 to VDD/2.

AGND2

Analog Ground 2. Connect AGND2 to AGND1.

EN2

Enable Input 2. EN2 must be connected to EN1. Drive high to enable MP7745, drive low to

disable.

BS2

High-Side MOSFET Bootstrap Input for Amplifier 2. A capacitor from BS2 to SW2 supplies the

gate drive current to the internal high-side MOSFET. Connect a 0.1µF~1µF capacitor from

SW2 to BS2.

VDD2

Power Supply Input. Bypass VDD2 to PGND2 with a 1µF X7R capacitor (in addition to the

main bulk capacitor), placed close to the IC PIN13 and PIN15.

SW2

Switched Power Output. SW2 is the output of Amplifier 2. Connect the LC filter to this pin.

PGND2

Power Ground for Amplifier 2. Connect PGND2 to PGND1.

BS1

High-Side MOSFET Bootstrap Input for Amplifier 1. A capacitor from BS1 to SW1

supplies the gate drive current to the internal high-side MOSFET. Connect a

0.1µF~1µF capacitor from SW1 to BS1. See Figure 1.

VDD1

Power Supply Input. Bypass VDD1 to PGND1 with a 1µF X7R capacitor (in addition to

the main bulk capacitor), placed close to the IC PIN18 and PIN20.

SW1

Switched Power Output. SW1 is the output of Amplifier 1. Connect the LC filter to this

pin. See Figure 1.

PGND1

Power Ground for Amplifier 1. Connect PGND1 to PGND2. See Figure 1.

Exposed

Pad

Connect exposed pad to GND plane for proper thermal performance.

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