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LM2672 Datasheet(PDF) 13 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) 13 Page - National Semiconductor (TI)

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LM2672 Series Buck Regulator Design Procedure (Fixed Output) (Continued)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed Output Voltage Version)
where:
I
SS
= Soft-Start Current
:4.5 µA typical.
t
SS
= Soft-Start Time
:Selected.
V
SSTH
= Soft-Start Threshold Voltage
:0.63V typical.
V
OUT
= Output Voltage
:Selected.
V
SCHOTTKY
= Schottky Diode Voltage Drop
:0.4V typical.
V
IN
= Input Voltage
:Selected.
If this feature is not desired, leave this pin open.
7. Frequency Synchronization (optional)
The LM2672 (oscillator) can be synchronized to run with an
external oscillator, using the sync pin (pin 3). By doing so, the
LM2672 can be operated at higher frequencies than the
standard frequency of 260 kHz. This allows for a reduction in
the size of the inductor and output capacitor.
As shown in the drawing below, a signal applied to a RC filter at
the sync pin causes the device to synchronize to the frequency
of that signal. For a signal with a peak-to-peak amplitude of 3V
or greater,a1k
Ω resistor and a 100 pF capacitor are suitable
values.
7. Frequency Synchronization (optional)
For all applications, usea1k
Ω resistor and a 100 pF capacitor
for the RC filter.
INDUCTOR VALUE SELECTION GUIDES (For
Continuous Mode Operation)
01293429
FIGURE 4. LM2672-3.3
01293430
FIGURE 5. LM2672-5.0
www.national.com
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