TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
9
10
Name Description
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).
Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The
FB1
feedback voltage is 0.6V.
IN2 Channel 2 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
GND2 Ground 2.
Channel 2 Power Switch Output. Inductor connection to drains of the internal PFET and NFET
SW2
switches.
Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2
EN2
below 0.3V to turn it off (shutdown current < 0.1µA).
Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The
FB2
feedback voltage is 0.6V.
IN1 Channel 1 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
GND1 Ground 1.
Channel 1 Power Switch Output. Inductor connection to drains of the internal PFET and NFET
SW1
switches.
EN1
MP2109 Rev.1.3
2/21/2006
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