LM2672N-12 National Semiconductor, LM2672N-12 Datasheet - Page 10
LM2672N-12
Manufacturer Part Number
LM2672N-12
Description
Voltage Regulator IC
Manufacturer
National Semiconductor
Specifications of LM2672N-12
Output Current
1A
Output Voltage
12V
No. Of Pins
8
Peak Reflow Compatible (260 C)
No
Leaded Process Compatible
No
Mounting Type
Through Hole
Package / Case
8 Lead
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2672N-12
Manufacturer:
NSC
Quantity:
5 510
Company:
Part Number:
LM2672N-12
Manufacturer:
MOT
Quantity:
5 510
Company:
Part Number:
LM2672N-12/NOPB
Manufacturer:
IXYS
Quantity:
2 000
www.national.com
To simplify the buck regulator design procedure, National
Semiconductor is making available computer design software to
be used with the SIMPLE SWITCHER line of switching
regulators. LM267X Made Simple version 1.0 is available on
Windows
Given:
Test Circuit and Layout Guidelines
C
C
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68 µH Sumida #RCR110D-680L
R1 - 1.5 kΩ, 1%
C
For a 5V output, select R2 to be 4.75 kΩ, 1%
where V
Use a 1% resistor for best stability.
LM2672 Series Buck Regulator
Design Procedure (Fixed Output)
V
V
I
LOAD
IN
OUT
B
OUT
IN
- 0.01 µF, 50V Ceramic
- 22 µF, 50V Tantalum, Sprague “199D Series”
(max) = Maximum DC Input Voltage
- 47 µF, 25V Tantalum, Sprague “595D Series”
(max) = Maximum Load Current
= Regulated Output Voltage (3.3V, 5V, or 12V)
PROCEDURE (Fixed Output Voltage Version)
®
REF
3.1, NT, or 95 operating systems.
= 1.21V
FIGURE 3. Standard Test Circuits and Layout Guides
Adjustable Output Voltage Versions
(Continued)
10
Given:
V
V
I
LOAD
OUT
IN
(max) = 12V
(max) = 1A
= 5V
EXAMPLE (Fixed Output Voltage Version)
01293423