LM2672M-3.3 National Semiconductor, LM2672M-3.3 Datasheet - Page 13

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LM2672M-3.3

Manufacturer Part Number
LM2672M-3.3
Description
SWITCHING REG 1A 3.3V, 2672, SOIC8
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2672M-3.3

Primary Input Voltage
12V
No. Of Outputs
1
Output Voltage
3.3V
Output Current
1A
Voltage Regulator Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Svhc
No SVHC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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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, a 1 kΩ resistor and a 100 pF capacitor are suitable
values.
LM2672 Series Buck Regulator Design Procedure (Fixed Output)
Inductor Value Selection Guides
(For Continuous Mode Operation)
PROCEDURE (Fixed Output Voltage Version)
FIGURE 4. LM2672-3.3
FIGURE 5. LM2672-5.0
01293430
01293429
13
7. Frequency Synchronization (optional)
For all applications, use a 1 kΩ resistor and a 100 pF capacitor
for the RC filter.
EXAMPLE (Fixed Output Voltage Version)
FIGURE 7. LM2672-ADJ
FIGURE 6. LM2672-12
01293432
(Continued)
01293431
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