5

Pin Descriptions

Pin # Pin Name Pin Function

1

SW

Switching output node — connect to the output LC filter.

2

PVIN

Power input supply voltage (2.7 to 5.5V).

3

VOUT

Input for sensing the output of LC filter.

4

FB

Input for regulation of output LC filter — Using R

to the typical application circuit diagram on page 1).

5

EN

Enable Input — when low, circuit draws <1µA. Apply a square wave clock at EN to synchronize the switching frequency

with an external clock. It is recommended that the externally applied clock frequency should not be above 20MHz.

6

AVIN

Input supply voltage

7

AGND

Analog ground

8

PGND

Power ground

Block Diagram