MP2105

1MHz, 800mA Synchronous

Step-Down Converter

MP2105 Rev. 1.2

www.MonolithicPower.com

1

8/19/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP2105 is a 1MHz constant frequency,

current mode, PWM step-down converter. The

device integrates a main switch and a

synchronous rectifier for high efficiency without

an external Schottky diode. It is ideal for

powering portable equipment that runs from a

single cell Lithium-Ion (Li+) battery. The

MP2105 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 MP2105

can also run at 100% duty cycle for low dropout

applications.

The MP2105 is available in a low profile (1mm)

5-pin, TSOT package.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV2105DJ-00A

2.0”X x 2.0”Y x 0.5”Z

FEATURES

• High Efficiency: Up to 95%

• 1MHz Constant Switching Frequency

• 800mA Available Load Current

• 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

• Space Saving 5-Pin TSOT23 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

MP2105

SW

FB

3

5

EN

GND

2

IN

1

4

OUTPUT

1.8V

800mA

INPUT

2.5V to 6V

MP2105_TAC_S01

OFF ON

100

90

80

70

60

50

40

30

20

10

0

10

100

1000

LOAD CURRENT (mA)

MP2105-EC01

Efficiency vs

Load Current