LM2671N-5.0 National Semiconductor, LM2671N-5.0 Datasheet - Page 12

• Manufacturer Part Number: LM2671N-5.0
• Description: DC/DC Converter IC
• Manufacturer: National Semiconductor

Specifications of LM2671N-5.0

• Input Voltage: 40V
• Output Current: 500mA
• Output Voltage: 5V
• No. Of Pins: 8
• Mounting Type: Through Hole
• Voltage Regulator Type: Buck Switching
• Output Current Max: 0.5A
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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7. Frequency Synchronization (optional)
The LM2671 (oscillator) can be synchronized to run with an
external oscillator, using the sync pin (pin 3). By doing so, the
LM2671 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 k
capacitor are suitable values.
LM2671 Series Buck Regulator Design Procedure (Fixed Output)
INDUCTOR VALUE SELECTION GUIDES (For Continuous Mode Operation)
PROCEDURE (Fixed Output Voltage Version)
FIGURE 4. LM2671-3.3
FIGURE 5. LM2671-5.0
resistor and a 100 pF
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DS100042-30
12
7. Frequency Synchronization (optional)
For all applications, use a 1 k
for the RC filter.
EXAMPLE (Fixed Output Voltage Version)
FIGURE 7. LM2671-ADJ
FIGURE 6. LM2671-12
resistor and a 100 pF capacitor
(Continued)
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