Details

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BUY LM3481MM/NOPB https://www.utsource.net/itm/p/12534795.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	-	4.5	-	36	V
Output Voltage Range	VOUT	-	0.8	-	36	V
Switching Frequency	fSW	-	-	650	-	kHz
Quiescent Current	IQ	VIN = 12V, No Load	-	2.5	-	mA
Shutdown Current	ISD	VIN = 12V, VSHDN = 0V	-	1	-	μA
Reference Voltage	VREF	-	-	0.8	-	V
Feedback Voltage	VFB	-	-	0.8	-	V
Current Limit	ILIM	-	-	2.5	-	A
Thermal Shutdown Temperature	TSD	-	-	160	-	°C
Operating Junction Temperature	TJ	-	-40	125	-	°C
Storage Temperature	TSTG	-	-65	150	-	°C

Instructions for Use:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 4.5V to 36V.
   • The input capacitor should be placed as close as possible to the input pins to minimize noise and ensure stable operation.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted from 0.8V to 36V using the feedback resistor network.
   • Use the formula ( V_ = V_ times left(1 + fracright) ) to calculate the resistor values, where ( V_ = 0.8V ).

3. Switching Frequency (fSW):

   • The switching frequency is typically set to 650kHz.
   • Adjust the external frequency-setting resistor if a different frequency is required.

4. Quiescent Current (IQ):

   • The quiescent current is typically 2.5mA under no-load conditions.
   • Ensure that the power supply can handle this current draw.

5. Shutdown Current (ISD):

   • The shutdown current is typically 1μA when the shutdown pin (VSHDN) is pulled low.
   • Use this feature to reduce power consumption when the device is not in use.

6. Reference Voltage (VREF):

   • The internal reference voltage is 0.8V.
   • This voltage is used to set the output voltage through the feedback network.

7. Feedback Voltage (VFB):

   • The feedback voltage is set to 0.8V.
   • Connect the feedback pin to the output voltage divider to maintain the desired output voltage.

8. Current Limit (ILIM):

   • The current limit is typically 2.5A.
   • This protects the device from overcurrent conditions.

9. Thermal Shutdown Temperature (TSD):

   • The device will shut down if the junction temperature exceeds 160°C.
   • Ensure proper heat dissipation to prevent thermal shutdown.

10. Operating Junction Temperature (TJ):

    • The operating junction temperature range is -40°C to 125°C.
    • Ensure that the device operates within this temperature range to avoid damage.

11. Storage Temperature (TSTG):

    • The storage temperature range is -65°C to 150°C.
    • Store the device in a suitable environment to prevent damage during storage.

Additional Notes:

• Always refer to the datasheet for detailed information and specific application notes.
• Proper PCB layout and component selection are crucial for optimal performance and reliability.

(For reference only)