MP2125

Dual 1.5A, 1.2MHz

Synchronous Step-Down Converter

MP2125 Rev. 1.0

www.MonolithicPower.com

1

12/24/2013

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

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

MP2125

1

2

3

4

7

11

13

14

FB1

FB2

EN1

GND2

GND1

VIN1

12

8

6

9

10

5

SW1

SW2

PVIN1

EN2

PVIN2

VIN2

N/C

Vin1

2.7V-6V

Vin2

2.7V-6V

C1

C2

EN1

EN2

L1

L2

1.8V/1.5A

1.8V/1.5A

C3

C4

Vout1

R1

R2

R3

Rt

Rt

R4

Vout2

N/C

Efficiency Curve

0

10

20

30

40

50

60

70

80

90

100

0

0.3

0.6

0.9

1.2

1.5

OUTPUT CURRENT (A)

Vin=3V

Vin=5V

Vin=6V