LM3674 Datasheet, PDF (2/15 Pages) National Semiconductor (TI) – 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

Typical Application (Continued)
FIGURE 2. Typical Application Circuit
Connection Diagram and Package Mark Information
SOT23-5 Package
NS Package Number MF05A
20167230
20167202
Note: The actual physical placement of the package marking will vary from part to part.
FIGURE 3. Top View
Pin Descriptions
Pin #
1
2
3
Name
V_IN
GND
EN
4
FB
5
SW
Description
Power supply input. Connect to the input filter capacitor ( Figure 1).
Ground pin.
Enable input. The device is in shutdown mode when voltage to this pin is <0.4V and
enable when >1.0V. Do not leave this pin floating.
Feedback analog input. Connect to the output filter capacitor for fixed voltage
versions. For adjustable version external resistor dividers are required ( Figure 2).
The internal resistor dividers are disabled for the adjustable version.
Switching node connection to the internal PFET switch and NFET synchronous
rectifier.
www.national.com
2