Details

---

BUY LM2852X-3.3 https://www.utsource.net/itm/p/12607240.html

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Input Voltage Range	VIN	4.5	-	28	V	Stable operation range
Output Voltage	VOUT	-	3.3	-	V	Fixed output voltage
Output Current	IOUT	-	1.5	2	A	Continuous output current
Quiescent Current	IQ	-	0.6	-	mA	Quiescent current at no load
Dropout Voltage	VDROPOUT	-	1.2	-	V	Dropout voltage at full load
Efficiency	畏	-	90	-	%	Typical efficiency at 1A output current
Switching Frequency	fSW	-	1.5	-	MHz	Internal oscillator frequency
Load Regulation	-	-	1	-	%	Change in output voltage with load from 0 to 2A
Line Regulation	-	-	0.1	-	%/V	Change in output voltage with input voltage from 4.5V to 28V
Ripple Rejection	-	-	60	-	dB	Power supply rejection ratio at 100kHz
Operating Temperature	Toper	-40	-	125	掳C	Operating temperature range
Storage Temperature	Tstg	-65	-	150	掳C	Storage temperature range
Thermal Resistance (胃JA)	-	-	60	-	掳C/W	Junction-to-ambient thermal resistance in typical application

Instructions for Use:

1. Input Capacitor (CIN):

   • Place a 10渭F ceramic capacitor close to the input pin to ensure stability and reduce input ripple.
   • Additional bulk capacitance may be required for high input currents or long input traces.

2. Output Capacitor (COUT):

   • Use a 10渭F ceramic capacitor on the output to maintain stability and minimize output ripple.
   • For lower ripple, consider using a larger value or a combination of capacitors.

3. Inductor Selection:

   • Choose an inductor with a value between 1渭H and 4.7渭H, depending on the desired trade-off between size and efficiency.
   • Ensure the inductor can handle the maximum output current without saturating.

4. PCB Layout:

   • Keep the input and output capacitors as close as possible to the respective pins.
   • Use wide, short traces for power paths to minimize parasitic inductance and resistance.
   • Ground planes should be used to provide a low-impedance return path and improve thermal performance.

5. Thermal Management:

   • Ensure adequate airflow or heatsinking if operating at high temperatures or high output currents.
   • The thermal resistance (胃JA) can be reduced by using a larger PCB area for heat dissipation.

6. Protection Features:

   • The LM2852X-3.3 includes overcurrent protection and thermal shutdown to prevent damage under fault conditions.
   • Verify that these features are sufficient for your application or add external protection if necessary.

7. Stability:

   • The device is designed to be stable with ceramic output capacitors. Avoid using electrolytic capacitors as they can affect stability.

8. Start-Up and Shutdown:

   • The device has a soft-start feature to limit inrush current during start-up.
   • The enable pin (EN) can be used to control the start-up and shutdown of the regulator. Pull it low to shut down the device and high to enable it.

9. Testing and Validation:

   • Test the circuit under all expected operating conditions to ensure stability and performance.
   • Measure output voltage, ripple, and efficiency to verify that the design meets specifications.

(For reference only)