Details

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BUY LM2574N-5 https://www.utsource.net/itm/p/12608609.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	4.5	-	40	V
Output Voltage	VOUT	-	5.0	-	V
Output Current	IOUT	-	3.0	-	A
Switching Frequency	fSW	-	52	-	kHz
Dropout Voltage	VDROPOUT	-	1.5	-	V
Quiescent Current	IQ	-	5.0	-	mA
Efficiency	畏	-	85	-	%
Load Regulation	-	-	0.5	-	%
Line Regulation	-	-	0.1	-	%
Output Ripple Voltage	VRIipple	-	100	-	mV p-p
Operating Temperature	Toper	-40	-	125	掳C
Storage Temperature	Tstg	-65	-	150	掳C

Instructions for Using LM2574N-5:

1. Input Voltage (VIN):

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

2. Output Voltage (VOUT):

   • The output voltage is fixed at 5.0V.
   • Use an output capacitor (typically 100渭F to 1000渭F) to stabilize the output voltage and reduce ripple.

3. Output Current (IOUT):

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

4. Switching Frequency (fSW):

   • The switching frequency is typically 52kHz.
   • This frequency helps in choosing the appropriate inductor and capacitors for the circuit.

5. Dropout Voltage (VDROPOUT):

   • The dropout voltage is typically 1.5V, meaning the input voltage must be at least 1.5V higher than the output voltage to maintain regulation.

6. Quiescent Current (IQ):

   • The quiescent current is typically 5.0mA.
   • This is the current consumed by the regulator when no load is present.

7. Efficiency (畏):

   • The typical efficiency is 85%.
   • Higher efficiency can be achieved with proper component selection and layout.

8. Load Regulation:

   • The load regulation is typically 0.5%, indicating the change in output voltage with varying load conditions.

9. Line Regulation:

   • The line regulation is typically 0.1%, indicating the change in output voltage with varying input voltage.

10. Output Ripple Voltage (VRIipple):

    • The typical output ripple voltage is 100mV peak-to-peak.
    • Use additional filtering if lower ripple is required.

11. Operating Temperature (Toper):

    • The operating temperature range is from -40掳C to 125掳C.
    • Ensure the device is used within this range to avoid thermal stress.

12. Storage Temperature (Tstg):

    • The storage temperature range is from -65掳C to 150掳C.
    • Store the device in a dry and cool environment to prevent damage.

Additional Notes:

• Inductor Selection:

  • Choose an inductor with a value between 100渭H and 1000渭H depending on the desired output current and switching frequency.
  • Ensure the inductor has a saturation current rating higher than the maximum output current.

• PCB Layout:

  • Place the input and output capacitors as close as possible to the IC to minimize noise and improve stability.
  • Use wide traces for power connections to reduce resistance and heat generation.

• Thermal Considerations:

  • Provide adequate heat sinking if the device is expected to operate at high power levels.
  • Monitor the temperature of the IC during operation to ensure it remains within safe limits.

(For reference only)