Details

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BUY NCP551SN50T1G https://www.utsource.net/itm/p/4929455.html
150 mA CMOS Low Iq Low-Dropout Voltage Regulator

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage	VIN	2.7	-	5.5	V
Output Voltage	VOUT	1.8	-	3.3	V	Adjustable
Quiescent Current	IQ	-	0.4	-	μA	No load
Load Regulation		-	0.5	-	%	0mA to 500mA
Line Regulation		-	0.05	-	%/V
Dropout Voltage	VDROPOUT	-	200	-	mV	@ 500mA
PSRR		-	65	-	dB	@ 1kHz
Operating Temperature	TOPR	-40	-	85	°C
Storage Temperature	TSTG	-65	-	150	°C

Instructions for NCP551SN50T1G:

1. Power Supply Connection:

   • Connect the input voltage (VIN) between the IN pin and GND.
   • Ensure the input voltage is within the specified range of 2.7V to 5.5V.

2. Output Configuration:

   • Adjust the output voltage using external resistors connected to the ADJ pin if not using fixed output versions.
   • Verify the output voltage (VOUT) is within the required operating range of your application (1.8V to 3.3V).

3. Capacitor Selection:

   • Use appropriate input and output capacitors to stabilize the regulator. Typically, ceramic capacitors with low ESR are recommended.
   • For input capacitance, a minimum of 1μF is suggested.
   • For output capacitance, use a value as per the datasheet recommendations to ensure stability.

4. Thermal Considerations:

   • Ensure adequate heat dissipation if operating near the maximum current or in high ambient temperatures.
   • The device can operate up to 85°C; beyond this, thermal shutdown may occur.

5. PCB Layout:

   • Place the regulator close to the power plane to minimize noise.
   • Keep the ground connections short and direct to reduce inductance and improve performance.

6. Testing and Verification:

   • After assembly, test the regulator under various load conditions to ensure it meets the design specifications.
   • Check for proper regulation, dropout voltage, and thermal stability.

(For reference only)