1.5MHz, Dual 1.5A, Synchronous

Step-Down Regulator

EC3221

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3F18N-Rev.P001

Pin Assignments

Figure 2 Pin Configuration of EC3221

Pin Description

Pin Number

Pin Name

Description

7,5

EN1,2

Enable Pin. EN is a digital input that turns the regulator on or off .Drive EN pin

high to turn on the regulator, drive it low to turn it off.

Exposed

paddle

GND

Ground Pin..

2,4

LX1,2

Power Switch Output Pin. SW is the switch node that supplies power to the

output.

1,3

IN1,2

Input pin. Decouple this pin to GND paddle with at least 10uF ceramic cap.

8,6

FB1,2

Feedback Pin. Through an external resistor divider network, FB senses the

output voltage and regulates it. The feedback threshold voltage is 0.6V.