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Below is the parameter table and instructions for the TPS5140, a high-efficiency, synchronous buck converter from Texas Instruments.

TPS5140 Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Test Conditions
Input Voltage	VIN	2.95	-	5.5	V
Output Voltage	VOUT	0.8	-	3.6	V	Adjustable via FB
Output Current	IOUT	-	3	4	A	Continuous
Switching Frequency	fSW	500	-	2200	kHz	Adjustable via RT
Efficiency (Typical)	η	-	95	-	%	VIN = 5V, VOUT = 3.3V, IOUT = 3A
Quiescent Current	IQ	-	30	-	μA	No load, VIN = 5V
Shutdown Current	ISD	-	1.5	-	μA	VIN = 5V, EN = 0V
Thermal Shutdown Temperature	TSD	-	160	-	°C
Operating Temperature	Toper	-40	-	125	°C
Storage Temperature	Tstg	-65	-	150	°C

TPS5140 Instructions

1. Power Supply Connections:

   • Connect the input voltage (VIN) to the input pin.
   • Ensure a low-ESR capacitor (typically 10 μF to 22 μF) is placed close to the VIN and GND pins to filter input noise.
   • Connect the output voltage (VOUT) to the output pin.
   • Place a low-ESR output capacitor (typically 10 μF to 22 μF) close to the VOUT and GND pins to stabilize the output.

2. Output Voltage Setting:

   • The output voltage is set by the feedback resistor network connected to the FB pin.
   • Use the formula ( V_ = V_ left(1 + fracright) ), where ( V_ = 0.8V ).

3. Switching Frequency Adjustment:

   • The switching frequency can be adjusted by connecting a resistor (RT) between the RT and GND pins.
   • Use the formula ( f_ = frac{1.1 times 10^6} ) to determine the value of RT.

4. Enable Pin (EN):

   • The EN pin controls the operation of the converter.
   • Apply a logic high (≥1.23V) to enable the converter.
   • Apply a logic low (≤0.8V) to disable the converter and put it into a low-power shutdown mode.

5. Thermal Management:

   • Ensure adequate heat dissipation by using a heatsink or thermal pad if operating at high currents.
   • Monitor the temperature to avoid exceeding the maximum operating temperature of 125°C.

6. Protection Features:

   • The TPS5140 includes overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO) to protect the device and the system.
   • UVLO activates when VIN falls below 2.95V, disabling the converter.

7. Layout Considerations:

   • Keep the input and output capacitors as close as possible to the respective pins to minimize parasitic inductance.
   • Use wide traces for power paths to reduce resistance and improve efficiency.
   • Place the inductor and MOSFETs close to the IC to minimize trace inductance and improve performance.

By following these instructions, you can effectively design and implement a power supply using the TPS5140.

(For reference only)