MP2116DQ-LF-Z Datasheet, PDF (1/13 Pages) MPS Industries, Inc. – 2A, 6V, 100% Duty Cycle Synchronous Step-Down Converter with 0.5A LDO

The Future of Analog IC Technology
MP2116
2A, 6V, 100% Duty Cycle Synchronous
Step-Down Converter with 0.5A LDO
DESCRIPTION
The MP2116 is an internally compensated
1.25MHz, 2A synchronous step-down switching
DC-DC converter plus a standalone low-input
voltage, 0.5A low dropout (LDO) linear regulator.
It is ideal for powering portable equipment that
operates from a single cell Lithium-Ion (Li+)
Battery. The MP2116 can provide up to 2A to
the switcher output, and 0.5A load current to
the LDO output from a 2.5V to 6V input voltage.
Both output voltages can be regulated as low
as 0.6V.
The 2A Synchronous switcher features
integrated high-side and low-side switch for
high efficiency and small footprint. With peak
current mode control and internal compensation,
the MP2116 is stable with ceramic capacitors.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown.
The standalone low-input voltage 0.5A LDO is
used to power noise sensitive circuitry. The
LDO’s separate input supply pin (IN2) can be
connected to the switcher output to reduce
power dissipation and noise from the main
switcher.
MP2116 is available in the small 10-pin
3mmx3mm QFN package.
FEATURES
• 100% Duty Cycle Low Dropout Operation
(High-Side PFET)
• 2A Switcher Output Current at V_IN=3V
• Internal Power MOSFET Switches
• Stable with Ceramic Capacitors
• Up to 95% Efficiency for Switcher
• 1.25MHz Switching Frequency
• Internal Soft-start for Switcher
• 2.5V to 6V Input Range, for Switcher
• 1V to V_IN1 Input Range, for LDO
• 0.5A LDO Output Current
• 1μA Shutdown Current
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Short Circuit Protection
• Power OK Output
• Available in 10-Pin QFN Package
APPLICATIONS
• DVD+/-RW Drives
• Smart Phones
• PDAs
• Digital Cameras
• Portable Instruments
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
R5
500kΩ
OFF ON
VIN
2.5V - 6V
*OUT1
1.8V @ 1.5A
C_O1
22μF
L
R1
499kΩ
C_IN2
R2 ^2.2μF
249kΩ
* IOUT1+IOUT2=2A
2 _EN1
9
EN2
3 _IN1
8
PWROK
4 _{SW1 MP2116 OUT2} 7
6 _IN2
10
FB2
1
FB1
5
GND
C_IN1
10μF
POWER OK
OUT2
R3
1.2V @ 0.5A
60kΩ _CO2
4.7μF
R4
60kΩ
Efficiency vs
Load Current
100
90 ^VIN^=3.3V
80
70
V_IN=4.0V
60
50
40
V_IN=5.0V
30
20
10
0
10
V_OUT=1.8V
100
1000 10000
LOAD CURRENT (mA)
MP2116 Rev.1.0
1/17/2013
www.MonolithicPower.com
1
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