The part number TPS53355DQPR refers to a voltage regulator IC produced by Texas Instruments (TI). This particular IC is a step-down (buck) converter, typically used to convert a higher input voltage to a stable lower output voltage for various electronic devices. It is designed for use in Power supply applications, particularly for systems requiring efficient power conversion with precise voltage regulation.
Packaging:
The TPS53355DQPR comes in a QFN (Quad Flat No-lead) package. The QFN package is typically used for surface-mount devices, and it is known for its small size and efficient thermal management. The exact package type for the TPS53355DQPR is the VQFN-16 (16 pins), which means there are 16 total pins in this specific package.
Pin Function Specification:
Here is a detailed table for the 16 pins of the TPS53355DQPR, including each pin's function and usage:
Pin Number Pin Name Function Description 1 VIN Input Voltage Pin: This is the input pin for the power supply. The voltage applied to this pin is converted to a lower output voltage by the regulator. The recommended input voltage is 4.5V to 17V. 2 VOUT Output Voltage Pin: This is the pin where the regulated output voltage is provided to the load. The voltage is determined by feedback from the external resistor divider. 3 GND Ground Pin: This pin serves as the common ground for the IC and the rest of the circuit. 4 FB Feedback Pin: Used for feedback control to regulate the output voltage. An external resistor divider network is connected to this pin to set the output voltage. 5 EN Enable Pin: This pin is used to enable or disable the operation of the regulator. It can be tied high (for enabling the device) or low (to disable). 6 COMP Compensation Pin: Used for the external compensation network, which stabilizes the regulator's operation. The external components are necessary for proper loop stability. 7 SS Soft Start Pin: Controls the rate of voltage rise at the output during startup. It prevents inrush current and allows for smooth start-up of the output voltage. 8 PGOOD Power Good Pin: This output pin indicates whether the output voltage is within the required range. When the output voltage is within the specified range, this pin is high; otherwise, it is low. 9 BOOT Bootstrap Pin: This pin is used for the bootstrap capacitor to supply the high-side MOSFET gate driver. A capacitor is required between this pin and the SW pin. 10 SW Switch Pin: This is the output pin of the internal switching transistor . It connects to the inductor and is used to control the current flow during the step-down conversion process. 11 VDD Power Supply Pin: Supplies power to the internal logic of the device. The voltage applied to this pin should be within the recommended range. 12 AGND Analog Ground Pin: This is the ground pin for the analog section of the IC, providing a separate ground reference for noise-sensitive parts of the IC. 13 PHASE Phase Pin: Used to sense the voltage across the inductor to control the switching timing. 14 NC No Connection Pin: This pin has no internal connection and does not serve any function in the circuit. It can be left unconnected or tied to ground. 15 PGND Power Ground Pin: This pin is used for the power section ground and should be connected to the main ground plane of the system. 16 DRV Driver Pin: This pin controls the gate of the external MOSFETs in the power stage. It needs to be connected to the gate drive circuitry for proper switching.FAQ (Frequently Asked Questions):
What is the TPS53355DQPR and what is it used for? The TPS53355DQPR is a buck converter IC designed to step down a higher input voltage to a stable lower output voltage for power supply applications. What is the package type for the TPS53355DQPR? The TPS53355DQPR comes in a QFN-16 package, which has 16 pins in total. What is the input voltage range for the TPS53355DQPR? The recommended input voltage range for the TPS53355DQPR is 4.5V to 17V. What is the output voltage of the TPS53355DQPR? The output voltage is set by an external resistor divider connected to the FB (feedback) pin. How do I enable or disable the TPS53355DQPR? The EN (Enable) pin is used to enable or disable the IC. A high voltage on this pin enables the device, while a low voltage disables it. **What is the purpose of the *FB* (feedback) pin?** The FB pin is used to monitor the output voltage. An external resistor divider is connected to this pin to set the output voltage. What is the soft start feature in the TPS53355DQPR? The SS pin controls the soft start function, which manages the rate of voltage rise at the output during startup to prevent inrush currents. **What is the function of the *PGOOD* pin?** The PGOOD pin signals the status of the output voltage. It goes high when the output voltage is within the desired range, and low if it is out of range. **What is the *BOOT* pin used for?** The BOOT pin connects to the bootstrap capacitor, which is used to supply the gate drive for the high-side MOSFET.**What is the *SW* pin in the TPS53355DQPR?**
The SW pin is the switching output, controlling the current flow to the inductor in the step-down conversion process.**What is the purpose of the *COMP* pin?**
The COMP pin is used for external compensation to stabilize the regulator’s operation, particularly the control loop.**Can the *TPS53355DQPR* be used in parallel with other regulators?**
Yes, the device can be used in parallel for higher current applications, but careful design consideration is needed to balance the current distribution.Is it necessary to use an external inductor with the TPS53355DQPR?
Yes, the TPS53355DQPR requires an external inductor to filter the output voltage and provide smooth DC output.**What is the function of the *PHASE* pin?**
The PHASE pin senses the voltage across the inductor to control the switching timing of the regulator.What is the recommended output capacitor for the TPS53355DQPR?
A high-quality low-ESR ceramic capacitor is recommended for the output to ensure stable operation and minimize noise.What is the ground pin configuration of the TPS53355DQPR?
The GND, AGND, and PGND pins serve different grounding functions: GND is the main ground, AGND is for the analog section, and PGND is for the power section.How do I determine the correct output voltage for the TPS53355DQPR?
The output voltage is determined by the resistor divider network connected to the FB pin. The voltage can be calculated using the formula: Vout = Vref × (1 + R2/R1).Can I use the TPS53355DQPR for high-power applications?
Yes, the TPS53355DQPR is suitable for applications requiring up to 3A of output current, though thermal management should be considered for higher power levels.What is the maximum output current for the TPS53355DQPR?
The TPS53355DQPR can supply up to 3A of output current.Is the TPS53355DQPR RoHS compliant?
Yes, the TPS53355DQPR is RoHS compliant, meaning it is free of hazardous substances such as lead, mercury, and cadmium.This detailed guide provides an overview of the TPS53355DQPR pin functions, packaging, and answers to common questions. Let me know if you'd like further clarification on any point!
