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LM2672 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2672
Description  SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2672 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Test Circuit and Layout Guidelines (Continued)
LM2672 Series Buck Regulator
Design Procedure (Fixed Output)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed Output Voltage Version)
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® 3.1, NT, or 95 operating systems.
Given:
Given:
V
OUT = Regulated Output Voltage (3.3V, 5V, or 12V)
V
OUT =5V
V
IN(max) = Maximum DC Input Voltage
V
IN(max) = 12V
I
LOAD(max) = Maximum Load Current
I
LOAD(max) = 1A
01293423
CIN - 22 µF, 50V Tantalum, Sprague “199D Series”
COUT - 47 µF, 25V Tantalum, Sprague “595D Series”
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68 µH Sumida #RCR110D-680L
R1 - 1.5 k
Ω,1%
CB - 0.01 µF, 50V Ceramic
For a 5V output, select R2 to be 4.75 k
Ω,1%
where V
REF = 1.21V
Use a 1% resistor for best stability.
FIGURE 3. Standard Test Circuits and Layout Guides
Adjustable Output Voltage Versions
www.national.com
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