The TPS544C20RVFR is a DC-DC buck converter from Texas Instruments (TI). This IC is designed to convert a higher voltage to a lower, stable output voltage. It is typically used for applications requiring efficient voltage regulation in compact, high-performance circuits.
The TPS544C20RVFR has a QFN-20 package (20 pins) and integrates a variety of features to support Power conversion and regulation. Let's break down the pin functions, encapsulation details, and FAQs in detail.
Package Type:
The TPS544C20RVFR comes in a QFN-20 package, meaning it has 20 pins, and it is a Quad Flat No-lead (QFN) type of surface-mount package. The QFN package offers excellent thermal performance and is widely used in compact power electronics designs.
Pin Functions and Description:
Here is a detailed pin-out for the TPS544C20RVFR, along with the description of each pin’s function. We’ll provide the pin numbers, names, and the exact description of the role of each pin in the system.
Pin Number Pin Name Pin Function Description 1 SW Switch Node. This pin connects to the switching node of the internal MOSFETs , which is used for high-frequency switching in the power converter. 2 VOUT Output Voltage Pin. This is where the regulated output voltage is provided to the load. 3 VCC Power Supply Pin. This pin connects to the input power supply. It powers the internal circuitry of the device. 4 PGND Power Ground. This pin connects to the ground plane of the circuit. It provides a low-impedance path for the high-current ground return. 5 NC No Connect. This pin is not internally connected and can be left floating. 6 FB Feedback Pin. The voltage from this pin is used to regulate the output voltage by comparing it with a reference voltage. 7 COMP Compensation Pin. Used for frequency compensation in the control loop to stabilize the regulator. 8 EN Enable Pin. This pin is used to enable or disable the device by applying a logic high or low signal. 9 SS Soft-Start Pin. Controls the soft-start time of the converter during power-up to reduce inrush current. 10 RT/CT Resistor and capacitor for Timing . This pin is used to set the switching frequency by connecting an external resistor and capacitor. 11 SYNC Synchronization Pin. This pin allows the device to synchronize to an external clock signal. 12 PGOOD Power Good Output Pin. Indicates when the output voltage is within a valid range (high signal means good, low means fault). 13 IN Input Pin. This is the input power source for the DC-DC converter. 14 VOUT_SENSE Output Voltage Sense Pin. Used for sensing the output voltage remotely. 15 GND Ground Pin. Common ground for all internal circuitry. 16 ISEN+ Positive Current Sense Pin. Used for current mode control. Senses the current through the inductor. 17 ISEN- Negative Current Sense Pin. Complements ISEN+ and is used for current feedback. 18 PGND_SENSE Ground Sense Pin. Used to sense ground voltage in power ground loops. 19 SW2 Secondary Switch Node. In some configurations, this pin is used for a second switching channel or mode. 20 SW1 Primary Switch Node. Used in the primary switching channel for the conversion process.Circuit Principle:
The TPS544C20RVFR is a buck converter, meaning it steps down a higher voltage to a lower, stable output voltage using high-frequency switching. The switching frequency is typically set by an external resistor and capacitor connected to the RT/CT pin, controlling the on/off cycles of the internal MOSFETs. The feedback loop, which includes the FB pin, compares the output voltage to a reference and adjusts the switching accordingly to regulate the voltage. The SW pin connects to the output of the internal MOSFET switch, which alternates between high and low states at the switching frequency. The PGND and GND pins provide the necessary return paths for current, ensuring stable operation of the converter.20 FAQ for the TPS544C20RVFR:
Q: What is the input voltage range of the TPS544C20RVFR? A: The TPS544C20RVFR supports an input voltage range of 4.5V to 60V.
Q: How do I enable the TPS544C20RVFR? A: To enable the device, apply a logic high signal to the EN pin.
Q: How do I set the output voltage? A: The output voltage is set by the resistor divider connected to the FB pin.
Q: What is the switching frequency of the TPS544C20RVFR? A: The switching frequency is adjustable between 200 kHz and 2.5 MHz by choosing appropriate values for the external components on the RT/CT pin.
Q: Can the TPS544C20RVFR be synchronized to an external clock? A: Yes, the SYNC pin allows the converter to synchronize to an external clock.
**Q: What is the function of the *COMP* pin?** A: The COMP pin is used for frequency compensation to stabilize the control loop.
**Q: How does the *SS* pin affect the device operation?** A: The SS pin controls the soft-start time of the converter to reduce inrush current during power-up.
Q: How can I monitor the output voltage status? A: The PGOOD pin provides a logic high signal when the output voltage is within regulation.
Q: What is the maximum output current the TPS544C20RVFR can supply? A: The device can supply up to 20A of output current.
Q: What is the efficiency of the TPS544C20RVFR? A: The efficiency can vary depending on the input and output conditions but typically ranges from 85% to 95%.
Q: What is the thermal shutdown temperature of the TPS544C20RVFR? A: The thermal shutdown occurs at around 150°C to protect the device from overheating.
Q: How do I ensure stability in the converter? A: Stability is achieved through proper selection of external components for frequency compensation, connected to the COMP pin.
Q: What is the typical start-up behavior of the TPS544C20RVFR? A: During start-up, the SS pin controls the ramp-up of the output voltage to prevent large inrush currents.
Q: Can the TPS544C20RVFR be used for applications requiring a high input voltage? A: Yes, the device supports input voltages up to 60V, making it suitable for high-voltage applications.
Q: Can I use the TPS544C20RVFR in a high-frequency application? A: Yes, the switching frequency can be adjusted up to 2.5 MHz, allowing for high-frequency operation.
Q: What should I do if the output voltage is not within the expected range? A: Check the feedback loop components and ensure the correct resistor divider is used for the FB pin.
Q: What are the common failure modes for the TPS544C20RVFR? A: Common failures include overvoltage, overheating, and incorrect external component selection.
Q: Can I use the TPS544C20RVFR in automotive applications? A: Yes, the device is rated for automotive use, with wide input voltage capabilities.
Q: Is the TPS544C20RVFR protected against short circuits? A: Yes, the device includes protection features such as overcurrent protection and thermal shutdown.
Q: What is the typical application for the TPS544C20RVFR? A: It is commonly used in industrial, automotive, and telecommunications applications where efficient voltage regulation is required.
This should give you a comprehensive understanding of the TPS544C20RVFR and its applications.