The model "TPS54140ADGQR" belongs to Texas Instruments. It is a DC-DC step-down (buck) converter designed to deliver an efficient and stable output voltage for various electronic applications.
1. Packaging Details:
Package Type: VQFN (Very Thin Quad Flat No-lead) Pin Count: 20 pins Package Code: VQFN-20 Package Dimensions: The package is a 5mm x 5mm QFN package with 0.5mm pitch.2. Pin Function Specifications:
Here is a detailed pinout description for the TPS54140ADGQR based on the 20 pins provided in the VQFN package:
Pin # Pin Name Function Description 1 VIN Input Voltage. This pin is connected to the supply voltage input for the buck converter. 2 PGND Power Ground. Connect to the ground plane of the system to provide a return path for high-current signals. 3 SW Switch node. Connects to the inductor and is responsible for providing a switching voltage. 4 SW Switch node (same as Pin 3). This pin works in parallel to handle high-current switching. 5 EN Enable. This pin is used to enable or disable the operation of the device by applying a logic-high (enable) or logic-low (disable) voltage. 6 PGOOD Power Good. This pin provides a signal indicating whether the output voltage is within the specified range. It typically connects to a microcontroller for monitoring purposes. 7 FB Feedback. This pin is used to monitor the output voltage and adjust the duty cycle of the switching process to regulate the output voltage. 8 COMP Compensation. This pin connects to an external compensation network to stabilize the feedback loop of the regulator. 9 ILIM Current Limit. Sets the maximum output current for the converter by connecting an external resistor. 10 AGND Analog Ground. Provides a low-noise ground return for the analog circuits within the converter. 11 PGND Power Ground (same as Pin 2). 12 VCC Supply Voltage for internal circuitry. Provides power to the internal logic of the device. 13 VOUT Output Voltage. This pin provides the regulated output voltage to the load. 14 NC No Connection. This pin is not internally connected and can be left floating or grounded. 15 SS Soft Start. This pin controls the startup behavior of the converter, smoothing the voltage ramp to avoid inrush current. 16 CLK Clock Output. Provides a clock signal used for synchronization with other devices in the system. 17 VOUT Output Voltage (again, same as Pin 13). 18 FB Feedback (same as Pin 7). 19 VCC Supply Voltage for internal circuitry (same as Pin 12). 20 SW Switch node (same as Pins 3 and 4).3. Circuit Principle Instructions:
The TPS54140ADGQR is a step-down DC-DC buck converter, which means it takes a higher input voltage and efficiently converts it into a lower, regulated output voltage. The primary working principle is as follows:
The input voltage (VIN) is applied to the converter. The converter switches on and off rapidly to transfer energy to the inductor through the SW pin. The inductor stores energy when the switch is closed and releases it when the switch opens. The energy transfer is controlled to maintain a stable output voltage. The output voltage is regulated by adjusting the duty cycle of the switching transistor based on the feedback from the FB pin. The output voltage is provided at the VOUT pin, and any issues with voltage regulation will trigger the PGOOD pin to indicate an error condition.This regulation loop ensures that the output voltage remains stable even with variations in input voltage or output load.
4. 20 FAQ Common Questions and Answers:
Q: What is the recommended input voltage for the TPS54140ADGQR? A: The recommended input voltage (VIN) for the TPS54140ADGQR is between 4.5V and 60V.
Q: How do I set the output voltage of the TPS54140ADGQR? A: The output voltage is set by the resistor divider connected to the FB pin, which determines the feedback voltage.
Q: Can I use the TPS54140ADGQR to regulate a 3.3V output? A: Yes, you can use the TPS54140ADGQR to output 3.3V by selecting the appropriate resistor values for the feedback divider.
Q: How do I enable or disable the converter? A: You can enable or disable the converter by applying a logic-high or logic-low signal to the EN (Enable) pin.
Q: What happens if the input voltage exceeds the recommended range? A: Exceeding the input voltage may damage the converter. Ensure that the input voltage does not exceed 60V, the maximum rating.
Q: What is the current limit feature on the TPS54140ADGQR? A: The ILIM pin allows you to set the maximum output current by connecting an external resistor.
Q: How do I monitor the output voltage status? A: The PGOOD pin provides a logic signal indicating whether the output voltage is within the acceptable range.
Q: Can I synchronize the switching frequency of the TPS54140ADGQR with another device? A: Yes, you can use the CLK pin to output a clock signal for synchronization with other devices.
Q: What is the purpose of the SS (Soft Start) pin? A: The SS pin controls the ramp-up time of the output voltage during startup, reducing inrush current.
Q: How do I connect the ground pins (PGND and AGND)? A: PGND and AGND should be connected to separate ground planes to minimize noise interference in the analog circuits.
Q: What is the maximum switching frequency of the TPS54140ADGQR? A: The maximum switching frequency for the TPS54140ADGQR is 1MHz.
Q: How do I ensure stability in the feedback loop? A: Stability is achieved by designing the external compensation network connected to the COMP pin.
Q: What is the role of the VOUT pin? A: The VOUT pin provides the regulated output voltage to the load.
Q: Can the TPS54140ADGQR operate with a 12V input? A: Yes, the TPS54140ADGQR can operate with a 12V input voltage, as it falls within the 4.5V to 60V input range.
Q: Is thermal protection included in the TPS54140ADGQR? A: Yes, the device includes thermal shutdown to protect against overheating.
Q: How do I select the output capacitor for the TPS54140ADGQR? A: Select an output capacitor with low ESR to maintain stability and support high-frequency operation.
Q: What type of inductor is recommended for the TPS54140ADGQR? A: A low-ESR inductor with suitable current rating and inductance should be selected based on the desired output voltage and load conditions.
Q: Can I use the TPS54140ADGQR for high-power applications? A: Yes, the TPS54140ADGQR is suitable for high-power applications up to 15A output current.
Q: How does the feedback regulation work in the TPS54140ADGQR? A: The feedback regulation works by comparing the output voltage to a reference voltage, adjusting the duty cycle to maintain the desired output.
Q: Can the TPS54140ADGQR be used for automotive applications? A: Yes, the TPS54140ADGQR can be used in automotive applications due to its wide input voltage range (4.5V to 60V).
This should cover the detailed specifications, functionality, and FAQs for the TPS54140ADGQR in a comprehensive manner. Let me know if you need more information!