BLOCK DIAGRAM

Rev G – 12/02/2008

SP6669 1.5MHz 0.6A Sync. Step Down Converter © 2008 Exar Corporation

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Fig.1: SP6669 Block Diagram

PIN DESCRIPTION

SOT23-5L

Pin Number

Name

Description

1

EN

Enable Pin. Do not leave the pin floating.

2

GND

Ground Signal Pin.

3

SW

Switching node.

4

VIN

Power Supply Pin.

Must be decoupled to ground with a 4.7µF or greater ceramic capacitor.

VFB

Adjustable Version Feedback Input Pin.

Connect VFB to the center point of the resistor divider.

5

VOUT

Fixed Output Voltage Version, Output Voltage Pin.

An internal resistive divider divides the output voltage down for comparison

to the internal reference voltage.