EV21148-QD-00B
1A Synchronous Step-down Converter
in Ultra-small 1x1.5mm QFN
EV21148-QD-00B Rev.1.0 www.MonolithicPower.com 1
5/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP21148 is a monolithic, step-down,
switch-mode converter with built-in internal
power MOSFETs. It achieves 1A continuous
output current from a 2.3V-to-5.5V input voltage
with excellent load and line regulation. The
output voltage can be regulated to as low as
0.6V.
The Constant-On-Time control scheme
provides fast transient response and eases loop
stabilization. Fault protections include cycle-by-
cycle current limiting and thermal shutdown.
The MP21148 is available in an ultra-small
QFN-6 (1.0mmx1.5mm) package and requires
a minimal number of readily available standard
external components.
The MP21148 is ideal for a wide range of
applications including high performance DSPs,
wireless power, portable and mobile devices,
and other low-power systems.
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Input Voltage V
IN
2.3 – 5.5 V
Output Voltage V
OUT
1.2 V
Output Current I
OUT
1 A
Note: V
IN
<3.3V may need more input capacitor.
FEATURES
2.2MHz Switching Frequency
EN for Power Sequencing
Power Good Only for Fixed Output Version
Wide 2.3V-to-5.5V Operating Input Range
Output Adjustable from 0.6V
Up to 1A Output Current
120m and 80m Internal Power MOSFET
Switches
Output Discharge
100% Duty Cycle
Short-Circuit Protection with Hiccup Mode
Stable with Low ESR Output Ceramic
Capacitors
Available in a QFN-6(1.0mmx1.5mm)
Package
APPLICATIONS
Wireless/Networking Cards
Portable and Mobile Devices
Battery Powered Devices
Low Voltage I/O System Power
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. Fo
MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
EV21148-QD-00B EVALUATION BOARD
Board Number MPS IC Number
EV21148-QD-00B MP21148GQD
I
OUT
(A)
Efficiency vs. I
OUT
V
IN
=5V
70
75
80
85
90
95
100
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
V
OUT
=1.2V
V
OUT
=1.8V
V
OUT
=2.5V
V
OUT
=3.3V
