MP2125 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – Dual 1.5A, 1.2MHz Synchronous Step-Down Converter

The Future of Analog IC Technology
MP2125
Dual 1.5A, 1.2MHz
Synchronous Step-Down Converter
DESCRIPTION
The MP2125 is a fully integrated dual PWM
step-down converter with built-in internal power
MOSFETs. It is ideal for powering portable
equipment that runs from a single cell Lithium-
Ion (Li+) Battery, with an input range from 2.7V
to 6V. The MP2125 can provide up to 1.5A of
load current with output voltage as low as 0.8V
for each output. It can also operate at 100%
duty cycle for low dropout applications.
With peak current mode control and internal
compensation, the MP2125 is stable with
ceramic capacitors and small inductors.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown.
MP2125 is available in the small 14-pin
3mmx4mm QFN package.
FEATURES
• 2.7V-6V Input Operation Range
• Each Output Adjustable from 0.8V to VIN
• 1uA Shutdown Current
• Up to 92% Efficiency
• 100% Duty Cycle for Low Dropout
Applications
• Fixed 1.2MHz Frequency
• Stable with Low ESR Output Ceramic
Capacitors
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Short Circuit Protection
• Available in 14-pin 3mmx4mm QFN
package
APPLICATIONS
• Solid State Disk
• DVD+/-RW Drivers
• Smart Phones
• PDAs
• Digital Cameras
• Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Vin1
2.7V-6V
C1
Vin2
2.7V-6V
C2
12
PVIN1
EN1 ¹⁴
13 _VIN1
SW1 ³
2 _GND1
FB1 ¹
4 _N/C ^MP2125 _N/C 11
5 _PVIN2
EN2 ⁷
6
VIN2
SW2 ¹⁰
9 _GND2
FB2 ⁸
EN1
L1
Rt
Vout1
1.8V/1.5A
R1
C3
R2
EN2
L2
Vout2
1.8V/1.5A
R3
C4
Rt
R4
Efficiency Curve
100
90
80
70
60
50
40
30
20
10
0
0
Vin=6V
Vin=5V
Vin=3V
0.3 0.6 0.9 1.2 1.5
OUTPUT CURRENT (A)
MP2125 Rev. 1.0
www.MonolithicPower.com
1
12/24/2013
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