The model "TPS54260DGQR" is a product from Texas Instruments. It is a DC-DC buck converter used for Power management. Below, I will provide detailed information on the pin functions, pinout, and some common FAQs regarding this component.
1. Package Type:
The "TPS54260DGQR" is housed in a VQFN-20 package. It is a 20-pin device with a Very Thin Quad Flat No-lead (VQFN) type of packaging. This package allows for better heat dissipation and provides a more compact footprint suitable for high-density applications.
2. Pinout and Pin Functions:
Here is the detailed pinout for the TPS54260DGQR in a 20-pin VQFN package:
Pin Number Pin Name Pin Function 1 VDD Power supply input pin. Connect to a stable input voltage (typically 5V to 36V) for the operation of the IC. 2 VIN Input voltage pin. This is typically connected to a voltage source from a DC bus or battery to provide power to the device. 3 SW Switch node. This pin is connected to the inductor and acts as the output of the switching converter. It is a high-frequency switching node. 4 PGND Power ground pin. Connect to the system ground plane to provide a return path for power currents. 5 BOOT Bootstrapping capacitor connection. This pin is used for driving the high-side MOSFET and needs to be connected to a capacitor to ensure proper operation. 6 EN Enable pin. This pin is used to enable or disable the device. Pull high to enable, pull low to disable the device. 7 PGOOD Power-good output. This pin indicates whether the output voltage is within a valid range. If the output voltage is within the target range, the pin is high. 8 FB Feedback pin. Connect this pin to a resistive divider network to set the output voltage. It is used to compare the feedback voltage to an internal reference. 9 COMP Compensation pin. This pin is used for controlling the loop dynamics and improving the stability of the regulator. 10 FREQ Frequency selection pin. Used to set the switching frequency of the device. Typically connected to a resistor or capacitor. 11 VOUT Output voltage pin. This is the regulated output voltage from the DC-DC converter. 12 ILIM Current limit pin. This pin is used to set the peak inductor current limit by connecting an external resistor. 13 RT Resistor pin. Used to set the switching frequency when a resistor is placed between this pin and ground. 14 NC No connection pin. This pin does not have any electrical connection and is used for mechanical purposes in the package. 15 SS Soft-start pin. This pin is used to set the soft-start time by connecting a capacitor to it. 16 VCC Logic voltage input pin. This pin is used for the internal logic supply voltage (typically 3.3V or 5V). 17 AGND Analog ground pin. Connect to the system ground to provide a reference for analog signals. 18 VIN2 Additional input voltage pin for dual-input configurations. Used for higher power applications. 19 GND Ground pin. This is the primary ground connection for the device. 20 PGND Power ground. Used to return the current to the system's ground plane, typically for the power sections of the device.3. Pin Function Details:
Power Pins (VDD, VIN, SW, PGND): VDD is the input power pin, typically 5V to 36V. It supplies the necessary power to the chip. VIN is another input voltage pin for the DC-DC converter, and it is typically connected to a source such as a battery or external supply. SW is the switch node that connects to the external inductor and is responsible for switching the output voltage to match the set target value. PGND is the power ground that provides a return path for the high current flowing through the power section. Control Pins (EN, PGOOD, FB, COMP, FREQ): EN is used to enable or disable the device. A high logic level enables the device, and a low logic level disables it. PGOOD indicates the status of the output voltage. If the output is within the specified voltage range, the PGOOD pin outputs a high signal. FB is the feedback pin where the external resistor divider network is connected to set the desired output voltage. COMP is used for loop compensation, which helps stabilize the device and ensure a smooth transient response. FREQ sets the switching frequency and is typically tied to an external resistor or capacitor. Other Pins (BOOT, ILIM, SS, VCC, RT, NC): BOOT provides the voltage required to drive the high-side MOSFET by connecting to a capacitor. ILIM is for setting the current limit for the device, preventing excessive inductor current during operation. SS determines the soft-start time to limit the inrush current during startup. VCC supplies the internal logic voltage for the device. RT is used to adjust the switching frequency, often through an external resistor. NC is not connected and has no electrical function but is provided for mechanical reasons.4. Common FAQs About TPS54260DGQR
Q1: What is the input voltage range for the TPS54260DGQR?A1: The input voltage range is 4.5V to 36V.
Q2: How can I set the output voltage of the TPS54260DGQR?A2: The output voltage is set by connecting a resistor divider to the FB pin.
Q3: What is the purpose of the soft-start pin (SS)?A3: The SS pin controls the soft-start time to limit inrush current during the startup sequence.
Q4: How do I enable the TPS54260DGQR?A4: To enable the device, apply a high logic level to the EN pin.
Q5: What is the switching frequency of the TPS54260DGQR?A5: The switching frequency is set by an external resistor connected to the FREQ pin.
Q6: What should be connected to the BOOT pin?A6: The BOOT pin should be connected to a bootstrap capacitor to drive the high-side MOSFET.
Q7: Can I use the TPS54260DGQR with a battery?A7: Yes, the TPS54260DGQR can be used with a battery as long as the input voltage stays within the specified range.
Q8: How do I know when the output voltage is valid?A8: The PGOOD pin will be high when the output voltage is within the specified range.
Q9: What is the role of the SW pin?A9: The SW pin is the switch node that connects to the inductor, generating the output voltage.
Q10: What is the maximum current limit for the TPS54260DGQR?A10: The maximum current limit is set through the ILIM pin using an external resistor.
Q11: How do I connect the power ground (PGND) pins?A11: Both PGND pins should be connected to the system ground plane for proper current return.
Q12: Can the TPS54260DGQR be used for higher power applications?A12: Yes, it can handle higher power applications with proper design, especially with dual-input configurations.
Q13: What is the difference between VDD and VIN?A13: VDD is the input power pin for the IC, and VIN is typically used for the input power to the DC-DC converter.
Q14: How can I configure the TPS54260DGQR for different output voltages?A14: The output voltage is determined by the resistor network connected to the FB pin.
Q15: What should be done if the PGOOD pin is low?A15: If the PGOOD pin is low, check the output voltage for possible faults, such as undervoltage.
Q16: How do I handle the output capacitor?A16: The output capacitor should be chosen based on the output voltage ripple and transient response requirements.
Q17: Can I use external components to control the switching frequency?A17: Yes, you can use an external resistor or capacitor connected to the FREQ pin to set the switching frequency.
Q18: What is the purpose of the COMP pin?A18: The COMP pin is used for loop compensation, ensuring stable operation of the regulator.
Q19: What is the thermal performance of the TPS54260DGQR?A19: The VQFN-20 package offers good thermal dissipation, but care should be taken in layout to ensure efficient heat sinking.
Q20: How do I connect the ILIM pin?A20: The ILIM pin should be connected to an external resistor to set the peak inductor current limit.
Conclusion:
The TPS54260DGQR is a highly versatile and efficient DC-DC buck converter from Texas Instruments, housed in a 20-pin VQFN package. It offers a wide range of control and protection features such as soft-start, current limit, and feedback regulation. The pinout and function list above provide a comprehensive understanding of the device's capabilities.