MP2127

2.7-6V Input, 2A, 1.2MHz

Synchronous Step-Down Converter

MP2127 Rev. 0.91

www.MonolithicPower.com

1

4/27/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2127 is a fully integrated, internally

compensated 1.2MHz fixed frequency PWM

step-down converter. 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 MP2127 can provide up to

2A of load current with output voltage as low as

0.8V. It can also operate at 100% duty cycle for

low dropout applications. With peak current

mode control and internal compensation, the

MP2127 is stable with ceramic capacitors and

small inductors. Fault condition protection

includes cycle-by-cycle current limiting and

thermal shutdown.

MP2127 is available in the small 6-pin

3mmx3mm QFN package.

FEATURES

• Output Adjustable from 0.8V to VIN

• Up to 95% Efficiency

• 100% Duty Cycle for Low Dropout

Applications

• Power Good Indicator Output

• 1.2MHz Fixed Switching Frequency

• Stable with Low ESR Output Ceramic

Capacitors

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Short circuit protection

• 2.7V-6V Input Operation Range

• Available in 6-pin 3x3mm QFN

APPLICATIONS

• Smart Phones, PDA’s

• DVD+/-RW Drives

• Digital Cameras

• Portable Instruments

“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

MP2127

PVIN

VIN

GND

PGOOD

SW

FB 1

2

3

6

4

5

C1

10

2.7V 6V

L1

3.3

R1

20k

R2

40k

C1

33

1.2V/2A

PGOOD

R3

100k

0

10

20

30

40

50

60

70

80

90

100

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Efficiency vs.

Load Current

LOAD CURRENT(A)

VIN=3V

VIN=5V