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MP2109 Datasheet

  • MP2109

  • Monolithic Power Systems [Dual 1.2MHz, 800mA Synchronous St...

  • MPS

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TM
MP2109
Dual 1.2MHz, 800mA Synchronous
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP2109 contains two independent 1.2MHz
constant frequency, current mode, PWM
step-down
converters.
Each
converter
integrates a main switch and a synchronous
rectifier for high efficiency without an external
Schottky diode. The MP2109 is ideal for
powering portable equipment that runs from a
single cell Lithium-Ion (Li+) battery. Each
converter can supply 800mA of load current
from a 2.5V to 6V input voltage. The output
voltage can be regulated as low as 0.6V. The
MP2109 can also run at 100% duty cycle for
low dropout applications.
FEATURES
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Up to 95% Efficiency
1.2MHz Constant Switching Frequency
800mA Load Current on Each Channel
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Current Mode Control
Short Circuit Protection
Thermal Fault Protection
<0.1碌A Shutdown Current
Internally Compensated
Space Saving 10-Pin QFN Package
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
EVALUATION BOARD REFERENCE
Board Number
EV2109DQ-00A
Dimensions
1.5鈥漍 x 1.0鈥漎 x 0.5鈥漐
APPLICATIONS
鈥淢PS鈥?and 鈥淭he Future of Analog IC Technology鈥?are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V
IN1/IN2
2.5V to 6V
8
IN1
3
IN2
EN2
6
100
95
OFF ON
OFF ON
1
EN1
90
EFFICIENCY (
%
)
85
80
75
70
65
60
55
50
0
V
OUT
=3.3V
V
OUT1
1.8V
800mA
10
SW1
MP2109
SW2
5
V
OUT2
1.2V
800mA
2
FB1
GND1
9
GND2
4
FB2
7
MP2109_S01
500
LOAD CURRENT (mA)
1000
MP2109_EC01
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
漏 2006 MPS. All Rights Reserved.
1

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