The model "TPS54308DDCR" is a product from Texas Instruments (TI). It's a part of their DC-DC buck converter series, designed to efficiently step down a higher input voltage to a lower, stable output voltage for various Power supply applications.
Packaging and Pin Function Details
Packaging Type: The "TPS54308DDCR" comes in a VQFN-20 (Very Thin Quad Flat No-lead) package. This package has 20 pins.Here is a detailed explanation of the pin functions for the 20 pins of the TPS54308DDCR:
Pin Number Pin Name Pin Type Pin Function/Description 1 VIN Power Supply Input voltage pin. Connect this pin to the input supply voltage. The recommended input range is 4.5V to 60V. 2 PGND Ground Power ground pin. Connect this pin directly to the ground of the power supply to ensure stable operation. 3 VOUT Output Output voltage pin. Provides the regulated output voltage. 4 SW Switching Node This pin connects to the external inductor and is used to deliver the switching signal to the inductor. 5 VOS Feedback Voltage Feedback voltage input for output voltage regulation. Used to sense the output voltage. 6 EN Enable Enable pin. When this pin is pulled high, the device is enabled, and the switching regulator operates. 7 FREQ Frequency Set Pin for setting the switching frequency. The frequency is adjustable through an external resistor. 8 CBOOT Boost capacitor Bootstrapped capacitor for driving the high-side MOSFET gate. Connect a capacitor between this pin and SW pin. 9 PGOOD Power Good Power-good indicator. This open-drain output pin provides a low signal when the output voltage is within regulation. 10 COMP Compensation Compensation pin used to stabilize the feedback loop by connecting an external capacitor and resistor. 11 ILIM Current Limit Current limit set pin. Allows an external resistor to set the current limit threshold for the device. 12 SS Soft-Start Soft-start pin. This pin helps to limit inrush current during startup by connecting an external capacitor. 13 FBD Feedback Divider Feedback divider pin for regulating the output voltage through external resistors. 14 SENSE+ Current Sense+ Positive current sense input for the inductor. Used to monitor the current flowing through the inductor. 15 SENSE- Current Sense- Negative current sense input for the inductor. Provides the differential voltage for current sensing. 16 VDD Internal Voltage Internal voltage pin for internal circuits of the device. Connect to a stable, filtered power supply. 17 NC No Connection No connection. This pin does not connect internally to the device. Do not use it. 18 VOUT2 Secondary Output A second output voltage pin for specialized designs or for dual output applications. 19 GND Ground Ground pin for the control logic section of the device. 20 PGND2 Power Ground 2 Another power ground pin for the regulator section. Connect to the main ground of the system.Frequently Asked Questions (FAQ)
Q: What is the input voltage range for the TPS54308DDCR? A: The recommended input voltage range for the TPS54308DDCR is from 4.5V to 60V.
Q: How do I enable the TPS54308DDCR? A: You can enable the TPS54308DDCR by applying a high signal to the EN (Enable) pin.
Q: Can I adjust the output voltage of the TPS54308DDCR? A: Yes, the output voltage can be adjusted by changing the feedback divider resistors connected to the FBD pin.
Q: What is the purpose of the PGND pin on the TPS54308DDCR? A: The PGND pin is the power ground pin that connects to the system ground, providing a reference for the power side of the converter.
Q: How do I set the switching frequency for the TPS54308DDCR? A: The switching frequency is set by an external resistor connected to the FREQ pin.
Q: What is the use of the SW pin on the TPS54308DDCR? A: The SW pin connects to the inductor and is used to deliver the switching signal to the inductor in the step-down conversion process.
Q: What is the function of the PGOOD pin on the TPS54308DDCR? A: The PGOOD pin is a power-good indicator that provides a low signal when the output voltage is within regulation.
Q: Can I adjust the current limit for the TPS54308DDCR? A: Yes, the current limit can be adjusted by connecting an external resistor to the ILIM pin.
Q: What is the role of the COMP pin on the TPS54308DDCR? A: The COMP pin is used for feedback loop compensation and requires an external capacitor and resistor for stability.
Q: How does soft-start function in the TPS54308DDCR? A: The SS pin enables soft-start functionality, reducing inrush current during startup by connecting an external capacitor.
Q: What should I connect to the CBOOT pin of the TPS54308DDCR? A: The CBOOT pin is used to connect a capacitor between this pin and the SW pin to drive the high-side MOSFET gate.
Q: What is the recommended output capacitor for the TPS54308DDCR? A: The recommended output capacitor is typically a low ESR capacitor to ensure stability and minimize ripple.
Q: What is the maximum output current that the TPS54308DDCR can provide? A: The TPS54308DDCR can supply up to 3A of output current.
Q: Can I use the TPS54308DDCR in parallel to increase output current? A: Yes, multiple TPS54308DDCR devices can be paralleled to increase the output current, but proper layout and external circuitry are necessary.
Q: How do I prevent overvoltage in the TPS54308DDCR? A: To prevent overvoltage, ensure the feedback circuit is correctly designed, and consider adding external overvoltage protection components.
Q: What is the typical efficiency of the TPS54308DDCR? A: The typical efficiency of the TPS54308DDCR is up to 95%, depending on the input/output voltage and load conditions.
Q: What is the significance of the VDD pin in the TPS54308DDCR? A: The VDD pin provides an internal supply voltage for the control logic section of the device.
Q: How does the TPS54308DDCR handle thermal shutdown? A: The TPS54308DDCR has an internal thermal shutdown feature that disables the device when the junction temperature exceeds a certain threshold, protecting the IC from overheating.
Q: Can I use the TPS54308DDCR for automotive applications? A: Yes, the TPS54308DDCR is suitable for automotive applications, but make sure to check the environmental conditions and input voltage requirements specific to your design.
Q: How do I calculate the inductor size for the TPS54308DDCR? A: The inductor size is determined by the required output current, switching frequency, and input/output voltage specifications. Use the provided equations in the datasheet for guidance.
These details cover the entire 20-pin configuration and offer insights into usage, design, and troubleshooting for the TPS54308DDCR. Let me know if you'd like further clarification or additional details!
