Details

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BUY LM2574HVM-5.0/NOPB https://www.utsource.net/itm/p/9921316.html
IC REG BUCK 5V 500MA 14SOIC

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Operating	4.5	-	40	V
Output Voltage	VOUT	Fixed	-	5.0	-	V
Output Current	IOUT	Continuous	-	3.0	-	A
Switching Frequency	fSW	Typical	-	150	-	kHz
Duty Cycle	D	Maximum	-	86	-	%
Dropout Voltage	VDROPOUT	IOUT = 3A, VIN = 5V	-	2.0	-	V
Quiescent Current	IQ	VIN = 40V, No Load	-	5.0	-	mA
Efficiency	η	VIN = 12V, VOUT = 5V	-	84	-	%
Thermal Shutdown	TSD		-	160	-	°C

Instructions for LM2574HVM-5.0/NOPB

1. Input Capacitor (CIN):

   • Use a 0.33 μF ceramic capacitor for stability.
   • Place as close as possible to the input pin.

2. Output Capacitor (COUT):

   • Select a capacitor with low ESR (Equivalent Series Resistance).
   • Recommended value is 100 μF aluminum electrolytic or tantalum.

3. Inductor Selection:

   • Choose an inductor based on the desired ripple current and output voltage regulation.
   • Typically, a 100 μH inductor is suitable for most applications.

4. Feedback Resistor Network:

   • The LM2574HVM-5.0/NOPB has a fixed output voltage of 5V, so no external resistors are required for setting the output voltage.

5. Schottky Diode:

   • Use a fast recovery Schottky diode to minimize switching losses.
   • Ensure it can handle the maximum peak current and has a reverse voltage rating higher than the input voltage.

6. Layout Considerations:

   • Keep the layout compact to reduce noise and parasitic effects.
   • Minimize trace lengths between the switch node, inductor, and diode.

7. Thermal Management:

   • Ensure adequate heat sinking if operating at high currents or in high ambient temperatures.
   • Monitor the junction temperature to avoid exceeding the thermal shutdown threshold.

8. Power-On Reset:

   • The device does not have a built-in power-on reset; consider adding external circuitry if necessary for your application.

9. Polarity Protection:

   • Ensure correct polarity of all components, especially capacitors and diodes, to prevent damage to the IC.

10. Testing:

    • After assembly, test the output voltage and current under various load conditions to ensure stable operation.

(For reference only)