MP2109 Datasheet, PDF (1/8 Pages) Monolithic Power Systems – Dual 1.2MHz, 800mA Synchronous Step-Down Converter

TM
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.
EVALUATION BOARD REFERENCE
Board Number
EV2109DQ-00A
Dimensions
1.5”X x 1.0”Y x 0.5”Z
MP2109
Dual 1.2MHz, 800mA Synchronous
Step-Down Converter
FEATURES
• 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
• <0.1µA Shutdown Current
• Internally Compensated
• Space Saving 10-Pin QFN Package
APPLICATIONS
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies
• PDAs
• MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V_IN1/IN2
2.5V to 6V
OFF ON
8
IN1
1 _EN1
3
IN2
EN2 ⁶
V_OUT1
1.8V
800mA
10 _{SW1 MP2109 SW2} 5
2
FB1
7
FB2
GND1 GND2
9
4
OFF ON
V_OUT2
1.2V
800mA
MP2109_S01
100
95
90
85
80
75
70
65
60
55
50
0
V_OUT=3.3V
500
1000
LOAD CURRENT (mA)
MP2109_EC01
MP2109 Rev.1.3
www.MonolithicPower.com
1
2/21/2006
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© 2006 MPS. All Rights Reserved.