Datasheet

V
IN
1
GND
2
EN
3
FB
4
SW
5
1
2
5
43
V
IN
SW
FB
EN
GND
L
1
: 4.7 µH or 10 µH
[A]
V
OUT
C
OUT
: 10 µF
C
IN
: 4.7 µF
LM3670
V
IN
2.5V to 5.5V
C
1
C
2
R
1
R
2
LM3670
SNVS250E –NOVEMBER 2004–REVISED FEBRUARY 2013 www.ti.com
DESCRIPTION (CONTINUED)
The LM3670 is available in a SOT-23-5 package. A high switching frequency - 1 MHz (typ) - allows use of tiny
surface-mount components. Only three external surface-mount components, an inductor and two ceramic
capacitors, are required.
Typical Application (continued)
A. See Table 3
Figure 2. Adjustable Output Voltage
Connection Diagram
Figure 3. SOT-23-5 Package (Top View)
PIN DESCRIPTIONS
Pin # Name Description
1 V
IN
Power supply input. Connect to the input filter capacitor (Figure 1).
2 GND Ground pin.
3 EN Enable input.
4 FB Feedback analog input. Connect to the output filter capacitor (Figure 1).
5 SW Switching node connection to the internal PFET switch and NFET synchronous rectifier. Connect to an
inductor with a saturation current rating that exceeds the 750 mA max. Switch Peak Current Limit
specification.
2 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
Product Folder Links: LM3670