Details

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BUY TPS51220ARTVT https://www.utsource.net/itm/p/5792917.html
Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller

Parameter	Symbol	Min	Typ	Max	Unit	Conditions/Notes
Input Voltage	VIN	4.5	-	18	V	Operating range
Output Voltage	VOUT	0.9	-	5.5	V	Programmable by external resistors
Switching Frequency	fSW	-	720	-	kHz	Fixed switching frequency
Efficiency	η	-	93	-	%	At 5V in, 3.3V out, 1A load
Load Current	ILOAD	-	-	6	A	Maximum continuous output current
Quiescent Current	IQ	-	1.3	-	mA	No load, all functions enabled
Shutdown Current	ISD	-	0.5	-	μA	In shutdown mode
Soft-Start Time	tSS	-	4	-	ms	Default setting, adjustable
Thermal Shutdown	TSD	-	160	-	°C	Typical thermal shutdown threshold
Package Type	PKG	-	-	-	-	HTSSOP (16)

Instructions for Use:

1. Input Voltage Configuration:

   • Ensure the input voltage is within the specified range of 4.5V to 18V.

2. Output Voltage Setting:

   • Set the desired output voltage using external resistors connected to the FB pin. Refer to the datasheet for resistor values corresponding to the required output voltage.

3. Switching Frequency Adjustment:

   • The switching frequency is fixed at 720kHz. For applications requiring a different frequency, consider selecting another device from the same family that supports frequency adjustment.

4. Efficiency Optimization:

   • To achieve optimal efficiency, ensure the load current and input/output voltages are within the recommended ranges provided in the datasheet.

5. Load Current Handling:

   • The device can supply up to 6A continuously. Verify that the PCB layout and heatsinking are adequate to handle the maximum load current without overheating.

6. Quiescent and Shutdown Current Management:

   • Keep quiescent current low by ensuring all unnecessary features are disabled when not in use.
   • Utilize the shutdown feature to minimize power consumption during inactive periods.

7. Soft-Start Configuration:

   • Adjust the soft-start time if necessary by connecting an external capacitor to the SS/TRK pin. The default setting is 4ms.

8. Thermal Monitoring:

   • Monitor the device temperature to ensure it does not exceed the thermal shutdown threshold of 160°C. Proper heat dissipation techniques should be employed.

9. Package Handling:

   • Handle the HTSSOP package with care to avoid damage to pins and ensure proper soldering techniques are used during assembly.

For detailed design considerations and application circuits, refer to the full datasheet available from the manufacturer's website.

(For reference only)