Details

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BUY TPS51225C https://www.utsource.net/itm/p/12614870.html

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage	VIN	2.9	-	5.5	V
Output Voltage	VOUT	0.6	-	3.3	V	Set by FB resistor divider
Switching Frequency	fSW	-	1.5	-	MHz
Quiescent Current	IQ	-	45	-	μA	VIN = 3.6V, IOUT = 0mA
Load Regulation	ΔVOUT/ΔIOUT	-	0.5	-	%	IOUT from 1mA to 500mA
Line Regulation	ΔVOUT/ΔVIN	-	0.2	-	%	VIN from 2.9V to 5.5V
Dropout Voltage	VDROPOUT	-	120	-	mV	IOUT = 500mA, VIN = 3.3V
Soft-Start Time	tSS	-	4	-	ms
Short-Circuit Current	ISC	-	1.2	-	A

Instructions for Use:

1. Input Capacitor Selection:

   • Choose an input capacitor with low ESR and ESL. A ceramic capacitor with X7R dielectric is recommended. Ensure it can handle the maximum input voltage.

2. Output Capacitor Selection:

   • Select an output capacitor that provides stable operation. A ceramic capacitor is preferred due to its low ESR.

3. Feedback Resistor Divider:

   • The output voltage is set by the feedback resistor divider. Calculate the values of R1 and R2 based on the desired output voltage using the formula provided in the datasheet.

4. Inductor Selection:

   • Choose an inductor with a saturation current higher than the maximum load current. Verify that the inductance value supports the switching frequency.

5. PCB Layout Considerations:

   • Place the input and output capacitors as close as possible to the device. Keep the high-current paths short and wide to minimize parasitic inductance.

6. Thermal Considerations:

   • Ensure adequate heat dissipation if operating at high currents or in high ambient temperatures. Consider adding thermal vias under the device.

7. Soft-Start Configuration:

   • The soft-start time can be adjusted by modifying the external capacitor connected to the SS/TR pin.

8. Protection Features:

   • The device includes protection features such as overcurrent protection (OCP) and thermal shutdown. Ensure these are not inadvertently disabled by external circuitry.

9. Power-Up Sequence:

   • Follow the recommended power-up sequence outlined in the datasheet to ensure reliable operation.

Note: Always refer to the latest datasheet for detailed specifications and application notes.

(For reference only)