Details

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BUY LM2574N-5.0 P+ https://www.utsource.net/itm/p/12609206.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Continuous	4.5	-	40	V
Output Voltage	VOUT	Fixed	-	5.0	-	V
Output Current	IOUT	Continuous	-	3.0	-	A
Switching Frequency	fSW	Internal	-	52	-	kHz
Efficiency	η	@ 5V, 1A	-	82	-	%
Dropout Voltage	VDROPOUT	@ 1A	-	1.2	-	V
Load Regulation	ΔVOUT	0mA to 3A	-	1.0	-	%
Line Regulation	ΔVOUT	10V to 36V	-	0.1	-	%
Ripple Voltage	VRIPPLE	@ 1A	-	50	-	mVpp
Quiescent Current	IQ	No Load	-	5	-	mA
Thermal Shutdown	TSD	Max Operating	-	160	-	°C
Storage Temperature	TSTG		-40	-	125	°C

Instructions for Using the LM2574N-5.0 P+

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 4.5V to 40V.
   • Use appropriate input capacitors (typically 10μF to 100μF) to stabilize the input voltage.

2. Output Voltage (VOUT):

   • The LM2574N-5.0 is a fixed 5.0V output regulator.
   • Use an output capacitor (typically 10μF to 100μF) to filter the output and reduce ripple.

3. Output Current (IOUT):

   • The maximum continuous output current is 3.0A.
   • Ensure the load does not exceed this limit to avoid overheating or damage.

4. Switching Frequency (fSW):

   • The internal switching frequency is 52kHz.
   • This helps in selecting the appropriate inductor and capacitor values for the output filter.

5. Efficiency (η):

   • The efficiency is typically 82% at 5V and 1A.
   • Optimize the circuit design to achieve the best efficiency by minimizing losses in the inductor and diode.

6. Dropout Voltage (VDROPOUT):

   • The dropout voltage is 1.2V at 1A.
   • Ensure the input voltage is at least 1.2V higher than the output voltage to maintain regulation.

7. Load Regulation (ΔVOUT):

   • The load regulation is 1.0% from 0mA to 3A.
   • This indicates the change in output voltage with varying load currents.

8. Line Regulation (ΔVOUT):

   • The line regulation is 0.1% from 10V to 36V.
   • This indicates the change in output voltage with varying input voltages.

9. Ripple Voltage (VRIPPLE):

   • The ripple voltage is 50mVpp at 1A.
   • Use additional filtering if lower ripple is required.

10. Quiescent Current (IQ):

    • The quiescent current is 5mA with no load.
    • This is the current consumed by the regulator itself.

11. Thermal Shutdown (TSD):

    • The thermal shutdown temperature is 160°C.
    • Ensure proper heat dissipation to prevent the device from overheating.

12. Storage Temperature (TSTG):

    • The storage temperature range is -40°C to 125°C.
    • Store the device in a suitable environment to avoid damage.

13. PCB Layout:

    • Place the input and output capacitors close to the regulator to minimize parasitic inductance.
    • Use wide traces for power paths to reduce resistance and heating.

14. Inductor Selection:

    • Choose an inductor with a saturation current rating higher than the maximum output current.
    • A typical value for the inductor is 100μH to 220μH.

15. Diode Selection:

    • Use a Schottky diode with a low forward voltage drop to minimize power loss.
    • Ensure the diode can handle the peak current and reverse voltage.

By following these guidelines, you can ensure reliable operation of the LM2574N-5.0 P+ in your application.

(For reference only)