Details

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BUY LM350K https://www.utsource.net/itm/p/12607566.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	3	-	40	V
Output Voltage	VOUT	1.2	-	37	V
Output Current	IOUT	-	3	5	A
Dropout Voltage	VDROPOUT	-	2	3	V
Quiescent Current	IQ	-	5	10	mA
Line Regulation	-	-	0.01	0.1	%/V
Load Regulation	-	-	0.1	1	%/A
Thermal Resistance	胃JA	-	-	65	掳C/W
Operating Temperature	Toper	-40	-	125	掳C
Storage Temperature	Tstg	-65	-	150	掳C

Instructions for Using the LM350K:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 3V to 40V.
   • The input voltage should be at least 2V to 3V higher than the desired output voltage to maintain regulation.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted from 1.2V to 37V using external resistors.
   • Use the following formula to set the output voltage: [ V_ = 1.25 left(1 + fracright) + I_ R_2 ] where ( R_1 ) and ( R_2 ) are the resistor values, and ( I_ ) is the adjustment pin current (typically around 50 渭A).

3. Output Current (IOUT):

   • The LM350K can provide up to 5A of output current.
   • For higher currents, ensure proper heat dissipation and use a heatsink if necessary.

4. Dropout Voltage (VDROPOUT):

   • The dropout voltage is typically between 2V and 3V.
   • Ensure the input voltage is always higher than the output voltage by at least this amount to maintain regulation.

5. Quiescent Current (IQ):

   • The quiescent current is typically 5mA but can go up to 10mA.
   • This current is drawn from the input supply even when no load is present.

6. Line Regulation:

   • The line regulation is very good, typically 0.01% per volt.
   • This ensures that the output voltage remains stable even with changes in input voltage.

7. Load Regulation:

   • The load regulation is also excellent, typically 0.1% per ampere.
   • This ensures that the output voltage remains stable even with changes in load current.

8. Thermal Management:

   • The thermal resistance (胃JA) is 65掳C/W.
   • Use a heatsink to dissipate heat if the device is operating at high power levels or in high ambient temperatures.

9. Operating and Storage Temperature:

   • The operating temperature range is from -40掳C to 125掳C.
   • The storage temperature range is from -65掳C to 150掳C.

10. Circuit Protection:

    • The LM350K includes internal overtemperature and short-circuit protection.
    • However, it is recommended to add external protection components like fuses and diodes for robust designs.

11. Capacitors:

    • Use a 0.1渭F ceramic capacitor at the input and a 10渭F electrolytic capacitor at the output for stability.
    • Additional capacitors may be required for specific applications to improve transient response and noise filtering.

12. PCB Layout:

    • Keep the input and output capacitors close to the IC to minimize parasitic inductance.
    • Use wide traces for power connections to reduce resistance and voltage drop.

By following these guidelines, you can ensure reliable and efficient operation of the LM350K in your circuit.

(For reference only)