The model "TPS62933DRLR" is from Texas Instruments. It is a Power Management IC designed specifically for efficient DC-DC conversion, ideal for low-power applications. Below, I will provide a comprehensive overview of the pin function specifications, circuit principles, and packaging details.
Pin Function Specifications and Circuit Principle
Overview:The TPS62933DRLR is a synchronous step-down converter with a wide input voltage range and low quiescent current, optimized for high efficiency in portable applications. It includes multiple pins to interface with the control, feedback, and output stages of the power converter.
Package and Pin Count
Package Type: QFN-16 (16 pins) Pin Count: 16Detailed Pinout Functionality (for QFN-16 Package)
Pin No. Pin Name Pin Type Description 1 VIN Power Input The input voltage to the IC, typically 2.3V to 5.5V. 2 EN Control Input Enable pin: Logic-high enables the IC. Logic-low disables it (Active-low). 3 PGND Ground Power ground pin, must be connected to the ground plane. 4 SW Output Switch pin: The switching node connected to the inductor. 5 FB Control Input Feedback input for voltage regulation. It senses the output voltage and adjusts the duty cycle to maintain the target output voltage. 6 PG Output Power good output, logic-high when the output voltage is within a valid range. 7 NC No Connect Not internally connected to anything. 8 VIN Power Input Same as Pin 1, typically used for parallel inputs or redundancies. 9 VOUT Output Output voltage pin, providing the regulated output voltage. 10 VOS Control Input Voltage offset sense for fine regulation. 11 COMP Control Input Compensation pin for external feedback loop compensation. 12 GND Ground Ground pin for signal and control ground. 13 FREQ Control Input External frequency setting pin, can be used to adjust switching frequency. 14 SS Control Input Soft-start control pin to limit inrush current during startup. 15 PGND Ground Power ground, typically used for large current paths. 16 VOUT Output Duplicate VOUT pin, for flexibility in layout and power routing.Circuit Principle
The TPS62933 operates as a synchronous buck converter, providing high efficiency and low ripple output voltage. The key principles of operation are:
PWM Control: The device adjusts the duty cycle of the switching transistor to regulate the output voltage. Feedback Loop: The feedback voltage (via FB pin) is constantly monitored and compared to a reference voltage to maintain a stable output. Synchronous Rectification: By using both an internal MOSFET for the switch and another MOSFET for the rectifier, efficiency is maximized by minimizing losses. Soft-Start: A capacitor at the SS pin ensures a smooth voltage ramp-up to avoid large inrush currents. Power Good: The PG pin indicates the status of the output voltage and provides an alert when the voltage falls outside the specified range.Frequently Asked Questions (FAQ) about TPS62933DRLR
What is the input voltage range of the TPS62933DRLR? The TPS62933DRLR operates with an input voltage range of 2.3V to 5.5V. What does the EN pin do? The EN pin is used to enable or disable the converter. A logic-high enables the IC, while a logic-low disables it. How does the feedback system work in the TPS62933DRLR? The FB pin is used to monitor the output voltage. The IC adjusts the duty cycle of the internal switch to maintain the desired output voltage. Can the output voltage be adjusted? Yes, the output voltage can be adjusted via external resistors connected to the feedback (FB) pin. What is the purpose of the PG pin? The PG pin provides a logic-high signal when the output voltage is within regulation, and a logic-low when it is out of range. What is the switching frequency of the TPS62933DRLR? The switching frequency is typically set by an internal oscillator but can be adjusted by an external resistor at the FREQ pin. Can the TPS62933DRLR be used for high-power applications? No, the TPS62933DRLR is designed for low-power applications, typically in the range of a few watts. What is the maximum output current the TPS62933DRLR can supply? The maximum output current is 2A, depending on thermal conditions and input voltage. How does the soft-start function work? The SS pin controls the rate at which the output voltage rises, helping to limit inrush current at startup.What is the efficiency of the TPS62933DRLR?
The efficiency of the device can exceed 90%, depending on the input and output voltage and load conditions.What is the quiescent current of the TPS62933DRLR?
The quiescent current is typically very low, around 20µA, which helps in maximizing battery life in portable devices.What is the output voltage range of the TPS62933DRLR?
The output voltage can be adjusted to any value between 0.8V and 3.3V depending on the external resistors.What is the maximum operating temperature for the TPS62933DRLR?
The maximum operating temperature is 125°C.What type of inductors should be used with the TPS62933DRLR?
A low ESR (equivalent series resistance) inductor is recommended for best performance.Can the device be used in battery-powered systems?
Yes, the low quiescent current and high efficiency make the TPS62933DRLR ideal for battery-powered systems.Is the TPS62933DRLR thermally protected?
Yes, the device includes thermal shutdown protection to prevent overheating.How is the TPS62933DRLR package mounted?
The device comes in a QFN-16 package, which is typically soldered onto a PCB using reflow soldering.Can the TPS62933DRLR be used for 5V applications?
Yes, it can be used with a 5V input, as the input range supports up to 5.5V.What is the power-good threshold for the TPS62933DRLR?
The power-good signal is asserted when the output voltage is within a specified range, typically within 5% of the target.Is there an external compensation required for the TPS62933DRLR?
External compensation is required, typically using a capacitor at the COMP pin for stable operation across all load conditions.This explanation and FAQ address all the pin functions, principles of operation, and common user queries. If you need further details or clarification, feel free to ask!