Connection Diagram and Package Mark Information

Pin Description

Pin #

Name

Description

1V

IN

Power supply input. Connect to the input filter capacitor (Figure 1).

2

GND

Ground pin.

3

EN

4

FB

Feedback analog input. Connect directly to the output filter capacitor for fixed voltage

versions. For adjustable version external resistor dividers are required. The internal

resistor dividers are disabled for the adjustable version.

5

SW

Switching node connection to the internal PFET switch and NFET synchronous

rectifier.

20108431

FIGURE 2. Typical Application Circuit for ADJ version

SOT23-5 Package

NS Package Number MF05A

20108402

Note: The actual physical placement of the package marking will vary from part to part.

FIGURE 3. Top View

www.national.com

2