MP1740 –3W HIGH EFFCIENCY MONO CLASS-D AUDIO AMPLIFIER

MP1740 Rev. 1.0

www.MonolithicPower.com

5

1/5/2012

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PIN FUNCTIONS

Ball

WLCSP

Name

Input/Ouput

/Power

(I/O/P)

Description

A1

INP

I

Positive differential input

A2

AGND

P

Analog Ground

A3

VON

O

Negative BTL output

B1

AVCC

P

Analog Power Supply

B2

PVCC

P

Power Supply

B3

PGND

P

Power Ground

C1

INN

I

Negative differential input

C2

EN

I

Enable Input. (drive high to enable the MP1740)

C3

VOP

O

Positive BTL output

TYPICAL PERFORMANCE CHARACTERISTICS

TEST SET-UP FOR GRAPHS

+

-

EN

VCC

Cs

40kHz Low

Pass Filter

Measurement

Output

Load

+

-

Measurement

Input

0.22uF

Cs

0.22uF

Cs

10uF

MP1740

EN

AVCC

AGND

INP

INN

VON

PGND

PVCC

VOP

Notes:

6) A 33µH inductor was placed in series with the load resistor to emulate a small speaker for efficiency measurements.

7) The 40 kHz low-pass filter is required even if the analyzer has a low-pass filter.

8)

For PSRR test, Please remove the great 10uF decoupling capacitor and just keep the small decoupling capacitors for recovery switching

currents.