MP1740

3W HIGH EFFICIENCY

MONO CLASS-D AUDIO AMPLIFIER

MP1740 Rev. 1.0

www.MonolithicPower.com

1

1/5/2012

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved

The Future of Analog IC Technology

DESCRIPTION

The MP1740 is a high efficiency Class-D H-

bridge audio amplifier. It utilizes a full bridge

output structure capable of delivering 3W into

4Ω speaker. The device exhibits the high fidelity

of a class AB amplifier with an efficiency of 91%.

It also dramatically reduces solution size by

integrating the following:

300mΩ (high side or low side) power MOSFETs

(VCC=3.6V)

Startup / Shutdown pop elimination

Short circuit protection

9 Balls Wafer chip scale package (WLCSP) and

requires a few external components.

This amplifier also improves GSM power supply

rejection, and operates on a single cellular Li-

ion battery.

The gain of this amplifier can be controlled

easily by a few modification of external

configuration while minimizing noise to 37

μVRMS.

FEATURES

• 3W Into 4Ω with 5 V Supply @ 10% THD+N

• Efficiency up to 90% at 1.7W Pout, 8 ohm

load

• 2.5V to 5.5V Supply Voltage Operation

• THD+N = 0.1% @ 1.8W, 5V, 4Ω

• 2mA Quiescent current and 0.5μA

shutdown current

• Full Bridge Output Drive

• Internal 250kHZ Switching frequency

• Fully Differential input

• Improved CMRR Eliminates Two Input

Coupling Capacitors

• 1ms start-up time Eliminates pop

• Integrated Short Circuit Protection

• Integrated Thermal Shutdown

• 9 Balls Wafer chip scale package (WLCSP)

APPLICATIONS

•

Wireless or Cellular Handsets

•

PDAs

All MPS parts are lead-free and adhere to the RoHS directive. For MPS

green status, please visit MPS website under Products, Quality

Assurance page.

“MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP1740

EN

AVCC

AGND

INN

INP

VON

PGND

PVCC

VOP

IN+

IN-

OUT

-

OUT

+

EN

To Battery

Cs

No Weighting

0.01

20

0.02

0.05

0.1

0.2

0.5

1

2

5

10

60m

4

100m 200m 300m 500m

1

2

3