Details

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BUY LM2673SD-3.3 https://www.utsource.net/itm/p/12609807.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Operating Range	4.5		42	V
Output Voltage	VOUT	Fixed		3.3		V
Output Current	IOUT	Continuous		3		A
Switching Frequency	fSW	Typical		500		kHz
Efficiency	畏	@ VIN = 12V, IOUT = 3A		92		%
Quiescent Current	IQ	No Load		1.8		mA
Dropout Voltage	VDROPOUT	@ IOUT = 3A		0.6		V
Thermal Shutdown	TSD			160		掳C

Instructions for LM2673SD-3.3

1. Input Capacitor Selection:

   • Use a ceramic capacitor with X7R dielectric for stability and low ESR.
   • Recommended value: 10 渭F to 47 渭F.

2. Output Capacitor Selection:

   • Choose a capacitor with low ESR to minimize output ripple.
   • Recommended value: 22 渭F to 100 渭F ceramic or tantalum capacitors.

3. Inductor Selection:

   • Select an inductor that can handle the maximum current without saturating.
   • Recommended value: 10 渭H to 22 渭H.

4. Feedback Network:

   • The LM2673SD-3.3 has a fixed output voltage of 3.3V, so no external feedback resistors are required.

5. PCB Layout Considerations:

   • Keep the input and output capacitors as close as possible to the device.
   • Ensure good thermal management by providing adequate copper area for heat dissipation.

6. Thermal Protection:

   • The device includes thermal shutdown protection which activates at approximately 160掳C.

7. Operation:

   • Ensure the input voltage is within the specified range (4.5V to 42V) to avoid damage or improper operation.
   • Verify that the load current does not exceed the maximum continuous output current of 3A.

(For reference only)