MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER

MP2109 Rev.1.3

www.MonolithicPower.com

4

2/21/2006

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TM

PIN FUNCTIONS

Pin #

Name Description

1

EN1

Channel 1 Enable Control Input. Drive EN1 above 1.5V to turn on the Channel 1. Drive EN1

below 0.3V to turn it off (shutdown current < 0.1µA).

2

FB1

Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The

feedback voltage is 0.6V.

3

IN2

Channel 2 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.

4

GND2 Ground 2.

5

SW2

Channel 2 Power Switch Output. Inductor connection to drains of the internal PFET and NFET

switches.

6

EN2

Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2

below 0.3V to turn it off (shutdown current < 0.1µA).

7

FB2

Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The

feedback voltage is 0.6V.

8

IN1

Channel 1 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.

9

GND1 Ground 1.

10

SW1

Channel 1 Power Switch Output. Inductor connection to drains of the internal PFET and NFET

switches.