MP2109

Dual 1.2MHz, 800mA Synchronous

Step-Down Converter

MP2109 Rev.1.4

www.MonolithicPower.com

1

10/16/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2109 contains two independent 1.2MHz

constant

frequency,

current

mode,

PWM

step-down

converters.

Each

converter

integrates a main switch and a synchronous

rectifier for high efficiency without an external

Schottky diode. The MP2109 is ideal for

powering portable equipment that runs from a

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

converter 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

MP2109 can also run at 100% duty cycle for

low dropout applications.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV2109DQ-00A

1.5”X x 1.0”Y x 0.5”Z

FEATURES

• Up to 95% Efficiency

• 1.2MHz Constant Switching Frequency

• 800mA Load Current on Each Channel

• 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

• Internally Compensated

• Space Saving 10-Pin QFN 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 Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP2109

IN2

IN1

3

8

4

9

GND2

GND1

FB2

SW2

EN2

7

5

6

2

10

1

FB1

SW1

EN1

2.5V to 6V

OFF ON

OFF ON

1.2V

800mA

1.8V

800mA

MP2109_S01

100

95

90

85

80

75

70

65

60

55

50

0

500

1000

LOAD CURRENT (mA)

MP2109_EC01