MP7748 – 2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER

MP7748 Rev. 1.0

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5

1/28/2011

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PIN FUNCTIONS

Pin #

Name

Description

1, 14

N/C

Not connected internally

2

REF1

3

IN1

Inverting input for amplifier 1.

4

TIMER1

set the internal timer for startup pop elimination.

5

AGND1

Analog ground for Amplifier 1. Connect AGND1 to AGND2. Connect PGND to AGND at a

single point.

6

EN1

Enable input for Amplifier 1. Drive EN1 high to turn on the Amplifier 1, low to turn it off.

7

UVP1

Under-voltage protection reference input for Amplifier 1. Connect UVP1 to UVP2.

8

IN2

Inverting input for amplifier 2.

9

REF2

10

TIMER2

Internal timer input for Amplifier 2. Connect a capacitor from TIMER2 to AGND (2.2uF) to

set the internal timer for startup pop elimination.

11

AGND2

Analog ground for Amplifier 2. Connect AGND2 to AGND1. Connect PGND to AGND at a

single point.

12

EN2

Enable input for Amplifier 2. Drive EN2 high to turn on the Amplifier 2, low to turn it off.

13

UVP2

Under-voltage protection reference input for Amplifier 2. Connect UVP2 to UVP1.

15, 16

VDD2

Power supply input for Amplifier 2. Bypass VDD2 to PGND2 with a 1µF X7R capacitor (in

addition to the main bulk capacitor), placed close to the VDD2 and PGND2 pins.

17

BST2

High-side MOSFET bootstrap input for Amplifier 2. A capacitor from BST2 to SW2

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

18, 19

SW2

Switched power output for Amplifier 2.

20, 21

PGND2

Power ground for Amplifier 2. Connect PGND2 to PGND1. Connect PGND to AGND at a

single point.

22, 23

VDD1

Power supply input for Amplifier 1. Bypass VDD1 to PGND1 with a 1µF X7R capacitor (in

addition to the main bulk capacitor), placed close to the VDD1 and PGND1 pins.

24

BST1

High-side MOSFET bootstrap input for Amplifier 1. A capacitor from BST1 to SW1

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

25, 26

SW1

Switched power output for Amplifier 1.

27, 28

PGND1

Power ground for Amplifier 1. Connect PGND1 to PGND2. Connect PGND to AGND at a

single point.

Exposed

Pad

Connect exposed pad to GND plane for proper thermal performance.