Details

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BUY LM2585S-ADJ https://www.utsource.net/itm/p/12604431.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	3.0	-	40	V
Output Voltage Range	VOUT	1.23	-	37	V
Output Current	IOUT	-	3.0	-	A
Switching Frequency	fSW	-	150	-	kHz
Efficiency (Typical)	畏	-	85	-	%
Dropout Voltage	VDROPOUT	-	1.0	-	V
Quiescent Current	IQ	-	5	-	mA
Shutdown Current	ISD	-	0.01	-	渭A
Thermal Shutdown Temperature	TSD	-	160	-	掳C
Operating Temperature Range	TOPR	-40	-	125	掳C
Storage Temperature Range	TSTG	-55	-	150	掳C

Instructions for Using LM2585S-ADJ

1. Input Capacitor (CIN):

   • Place a 1 渭F ceramic capacitor close to the input pin to filter out noise and provide a stable input voltage.

2. Output Capacitor (COUT):

   • Use a 10 渭F to 100 渭F electrolytic or tantalum capacitor to smooth the output voltage. For better transient response, add a 0.1 渭F ceramic capacitor in parallel.

3. Inductor (L):

   • Choose an inductor with a value between 10 渭H and 150 渭H. The inductor should have a saturation current rating higher than the maximum output current.

4. Feedback Resistor Network:

   • The output voltage is set by the feedback resistor network. The formula to calculate the output voltage is: [ V_ = 1.23 left(1 + fracright) ]
   • Typical values for R1 are 1 k惟 to 10 k惟. Adjust R2 accordingly to achieve the desired output voltage.

5. Shutdown Pin (SHDN):

   • To enable the regulator, connect the SHDN pin to VIN or leave it floating. To disable the regulator, pull the SHDN pin to GND.

6. Thermal Considerations:

   • Ensure adequate heat dissipation by mounting the IC on a heatsink if operating at high currents or in high ambient temperatures.

7. PCB Layout:

   • Keep the input and output capacitors as close as possible to the respective pins.
   • Use wide traces for power paths to minimize voltage drops and heating.
   • Ground planes can help improve thermal performance and reduce noise.

8. Transient Response:

   • For applications requiring fast transient response, consider using a smaller output capacitor and a faster switching frequency.

9. Overvoltage Protection:

   • The LM2585S-ADJ has built-in overvoltage protection, but external clamping diodes may be necessary for extreme conditions.

10. Capacitor ESR:

    • Use capacitors with low Equivalent Series Resistance (ESR) to minimize ripple and improve stability. However, ensure that the ESR is not too low to avoid instability issues.

(For reference only)