Details

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BUY LM22676MRE-ADJ/NOPB https://www.utsource.net/itm/p/12610400.html

Parameter	Symbol	Test Conditions	Min	Typical	Max	Unit
Input Voltage	VIN	Continuous Operation	4.5	-	42	V
Output Voltage	VOUT	Adjustable	1.23	-	38	V
Output Current	IOUT	Continuous Operation	-	3	5	A
Switching Frequency	fSW	Default Setting	-	500	-	kHz
Efficiency	畏	VOUT = 5V, IOUT = 3A	-	92	-	%
Quiescent Current	IQ	No Load, VIN = 12V	-	5	-	mA
Dropout Voltage	VDROPOUT	IOUT = 3A	-	0.5	-	V
Thermal Shutdown Temperature	TSD	-	160	-	掳C
Operating Junction Temperature	TJ	-	-40	-	125	掳C
Storage Temperature	TSTG	-	-65	-	150	掳C

Instructions for LM22676MRE-ADJ/NOPB

1. Circuit Configuration:

   • Connect the input voltage (VIN) to the input pin.
   • Connect the output voltage (VOUT) to the feedback (FB) pin through a voltage divider.
   • Connect the ground (GND) pin to the system ground.
   • Connect the inductor (L) between the switch node (SW) and the output capacitor (COUT).

2. Component Selection:

   • Inductor (L): Choose an inductor with a value that ensures stable operation at the desired output current and switching frequency. Typically, values range from 4.7 渭H to 22 渭H.
   • Output Capacitor (COUT): Use a low ESR ceramic capacitor for optimal performance. Values typically range from 10 渭F to 100 渭F.
   • Input Capacitor (CIN): Use a ceramic capacitor with a value of at least 10 渭F to filter input noise.

3. Feedback Network:

   • The output voltage is set by the ratio of two resistors (R1 and R2) connected to the FB pin. The formula to calculate the output voltage is: [ V_ = V_ left(1 + fracright) ] where ( V_ = 1.23 ) V.

4. Thermal Considerations:

   • Ensure proper heat dissipation by mounting the device on a heatsink or using a PCB with adequate copper area.
   • Monitor the junction temperature to ensure it does not exceed 125掳C.

5. Layout Guidelines:

   • Keep the traces between the SW pin, inductor, and output capacitor as short as possible to minimize parasitic inductance.
   • Place the input and output capacitors close to the respective pins to reduce noise and improve stability.

6. Testing and Troubleshooting:

   • Verify the input and output voltages with a multimeter.
   • Check the ripple on the output voltage using an oscilloscope.
   • If the device overheats, check the thermal design and ensure proper airflow.

By following these guidelines, you can ensure reliable and efficient operation of the LM22676MRE-ADJ/NOPB buck converter.

(For reference only)