MP1740
3W HIGH EFFICIENCY
The Future of Analog IC Technology
MONO CLASS-D AUDIO AMPLIFIER
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.
FEATURES
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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)
Wireless or Cellular Handsets
PDAs
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.
APPLICATIONS
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
To Battery
fs=1kHz, V
CC
=5V, Gain=2V/V
No Weighting
TND+N vs. P
OUT
Cs
AVCC
PVCC
THD+N (%)
20
10
5
R
I
IN+
IN-
EN
INP
R
I
INN
EN
VOP
OUT+
OUT-
2
1
0.5
0.2
0.1
0.05
0.02
0.01
MP1740
VON
PGND
AGND
60m 100m 200m 300m 500m
1
2
3 4
P
OUT
(W)
MP1740 Rev. 1.0
1/5/2012
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved
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MPS [ MONOLITHIC POWER SYSTEMS ]
