MP7758

– 18V, 2x15W, STEREO BTL, INDUCTORLESS CLASS-D AUDIO AMPLIFIER

MP7758 Rev. 1.0

www.MonolithicPower.com

4

12/3/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2020 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

EN

Enable input. Drive the EN pin high to turn the four amplifiers on (1A, 1B, 2A, and 2B);

drive EN low to turn them off.

2

/FAULT

Fault output. A low output at the /FAULT pin indicates that the IC has detected an

over-temperature or over-current condition. This output is open drain.

3

IN1A

Positive audio input for channel 1. Biased at 2.5V.

4

IN1B

Negative audio input for channel 1. Biased at 2.5V.

5

GAIN0

Gain selection bit.

6

GAIN1

Gain selection bit.

7

AVCC

Internal analog reference. This pin has a 5.5V output. Connect a bypass capacitor

from AVCC to AGND.

8

AGND

Analog ground.

9

VDR

Gate drive supply bypass. VDR powers the internal circuitry and the internal MOSFET

gate driver

. Bypass VDR to AGND with a 0.1μF to 10μF capacitor.

10

PLIMIT

Power limiting and anti-clipping feature control. Connect a resistor divider from

AVCC to GND to set the power limit. Connect a resistor divider directly to AVCC for no

power limit.

11

IN2B

Negative audio input for channel 2. Biased at 2.5V.

12

IN2A

Positive audio input for channel 2. Biased at 2.5V.

13

INABSENCE Open-drain output used to report the input signal absence.

14

CAP_D

Delay time control for input signal absence report function. The holding time can

be adjusted with an external capacitor. Connect this pin to AGND to disable automatic

shutdown if an input signal cannot be detected.

15, 16

PVCC2

Power supply input for channel 2.

Bypass PVCC2 to PGND2 with a 1μF X7R

capacitor (in addition to the main bulk capacitor), placed close to the PVCC2 and

PGND2 pins.

17

BST2A

High-side MOSFET bootstrap input for amplifier 2A. A capacitor connected from

BST2A to SW2A supplies the gate drive current to the internal high-side MOSFET.

18

SW2A

Switched power output for amplifier 2A (the positive output of channel 2).

19

PGND2

Power ground for amplifier 2A and 2B.

20

SW2B

Switched power output for amplifier 2B (the negative output of channel 2).

21

BST2B

High-side MOSFET bootstrap input for amplifier 2B. A capacitor from BST2B to

SW2B supplies the gate drive current to the internal high-side MOSFET.

22

BST1B

High-side MOSFET bootstrap input for amplifier 1B. A capacitor from BST1B to

SW1B supplies the gate drive current to the internal high-side MOSFET.

23

SW1B

Switched power output for amplifier 1B (the negative output of channel 1).

24

PGND1

Power ground for amplifier 1A and 1B.

25

SW1A

Switched power output for amplifier 1A (the positive output of channel 1).

26

BST1A

High-side MOSFET bootstrap input for amplifier 1A. Connect a capacitor from

BST1A to SW1A to supply the gate drive current to the internal high-side MOSFET.

27, 28

PVCC1

Power supply input for channel 1.

Bypass PVCC1 to PGND1 with a 1μF X7R

capacitor (in addition to the main bulk capacitor), placed close to the PVCC1 and

PGND1 pins.