The part number "TPS54335ADDAR" belongs to Texas Instruments (TI), a well-known s EMI conductor manufacturer. The TPS54335ADDAR is a DC-DC buck converter, which is designed for Power management applications, particularly in systems that require efficient voltage conversion with a high level of integration.
Package Type
The "ADDAR" in the part number indicates the package type and size. This specific model is housed in a QFN (Quad Flat No-lead) package with a 20-pin configuration. It is a compact and efficient packaging used for surface-mount applications, providing good thermal performance and minimizing the space required on the PCB.
Pin Function Specifications
Here is the pinout for the 20-pin QFN package for the TPS54335ADDAR and the detailed description of each pin’s function:
Pin # Pin Name Pin Function Description 1 VIN Power supply input for the buck converter. This pin receives the input voltage (typically 4.5V to 60V) that is converted to the desired output voltage. 2 PGND Power ground. This pin is connected to the power return of the system, used to return current from the load. It should be kept low-impedance to minimize ground loop issues. 3 VOUT Voltage output. This pin provides the output voltage from the buck converter. It should be connected to the load or the output power stage. 4 SW Switch node. This pin connects to the external inductor and is used to switch the power from the input to the output. It is typically connected to the drain of the internal MOSFET. 5 EN Enable input. This pin is used to enable or disable the device. Pulling it high enables the converter, while pulling it low disables it. 6 FREQ Frequency control pin. This pin allows for adjustment of the switching frequency of the converter, which can be used to optimize the efficiency or reduce EMI. 7 SS Soft-start pin. This pin is used to control the soft-start functionality to reduce inrush current at startup, preventing excessive inrush current that could damage components. 8 COMP Compensation pin. This pin is used for feedback compensation, ensuring the stability of the feedback loop. Typically, a capacitor and resistor network is used to set compensation. 9 VDD Internal voltage supply. This pin powers the internal circuitry of the converter, typically regulated internally from the VIN input pin. 10 VOSENSE Voltage output sense pin. This pin provides feedback of the output voltage for the voltage regulation feedback loop. It is typically connected to a voltage divider from the output. 11 FB Feedback pin. This is the feedback input for voltage regulation, which compares the output voltage to the reference voltage. 12 PG Power good output. This pin indicates when the output voltage is within the acceptable range. It is a logic signal that goes high when the output is within tolerance. 13 GND Ground pin. This is the reference ground for the entire device, providing a common return path for all signals and power. 14 SW Switch node (second). Same function as pin 4, typically providing connection to an additional phase or for redundancy. 15 VIN Power supply input (second). Provides an alternate connection to the power supply for the VIN pin to improve the input current capability. 16 VDD Internal voltage supply (second). An additional pin to power internal logic, providing redundancy or improving current capacity. 17 VOSENSE Voltage output sense (second). Additional feedback input for voltage regulation, similar to pin 10, for use with multi-phase or redundant designs. 18 FB Feedback pin (second). Additional feedback for multi-phase designs, ensuring that voltage regulation is balanced across all phases. 19 EN Enable input (second). A duplicate enable pin, used to control the enabling of the converter in multi-phase or redundant configurations. 20 GND Ground pin (second). Provides additional connection to ground for high-current applications, ensuring stable ground reference for the device.Common FAQ for TPS54335ADDAR
1. What is the input voltage range for the TPS54335ADDAR?Answer: The input voltage range for the TPS54335ADDAR is from 4.5V to 60V, which makes it suitable for a wide variety of power sources.
2. How many output voltage options are available for the TPS54335ADDAR?Answer: The TPS54335ADDAR is a fixed-output buck converter, and its output voltage is selectable by external feedback resistors. It supports output voltages ranging from 0.8V to 15V.
3. Can the TPS54335ADDAR be used for automotive applications?Answer: Yes, the TPS54335ADDAR is designed for a wide input voltage range, which makes it suitable for automotive power systems with voltage variations.
4. What is the maximum output current for the TPS54335ADDAR?Answer: The maximum output current is 3A, provided the thermal conditions are within specification.
5. How does the soft-start feature work on the TPS54335ADDAR?Answer: The soft-start function gradually ramps up the output voltage during startup, reducing inrush current and preventing damage to the circuit.
6. What is the typical switching frequency for the TPS54335ADDAR?Answer: The typical switching frequency is 300kHz, but it can be adjusted using the frequency control pin.
7. Does the TPS54335ADDAR include thermal protection?Answer: Yes, it includes thermal shutdown protection to prevent overheating and damage to the device.
8. How is the output voltage regulated in the TPS54335ADDAR?Answer: The output voltage is regulated by comparing the feedback voltage (from the FB pin) to an internal reference voltage of 0.8V.
9. What is the power good signal used for in the TPS54335ADDAR?Answer: The power good signal (PG) indicates whether the output voltage is within the specified range. It is typically used for fault detection and system monitoring.
10. Can the TPS54335ADDAR operate in parallel with other converters?Answer: Yes, it can be used in multi-phase configurations for higher output power and improved efficiency.
11. Is the TPS54335ADDAR compatible with external inductors?Answer: Yes, the TPS54335ADDAR is designed to work with external inductors that meet the specified value for optimal performance.
12. What is the recommended PCB layout for the TPS54335ADDAR?Answer: A well-designed PCB layout should minimize the loop area for high-current paths, provide adequate ground planes, and ensure proper thermal management.
13. What type of feedback compensation is needed for the TPS54335ADDAR?Answer: External components such as a resistor and capacitor network are required for feedback compensation to ensure stability across the operating range.
14. Can the TPS54335ADDAR be used for point-of-load applications?Answer: Yes, it is ideal for point-of-load applications where a high-efficiency voltage conversion is needed.
15. How can I disable the TPS54335ADDAR?Answer: You can disable the device by pulling the EN (enable) pin low.
16. Is there an internal diode in the TPS54335ADDAR?Answer: Yes, the TPS54335ADDAR includes an internal synchronous rectifier MOSFET to improve efficiency.
17. What is the maximum output ripple voltage for the TPS54335ADDAR?Answer: The output ripple voltage typically ranges from 10mV to 50mV, depending on the application.
18. Can the TPS54335ADDAR be used with multiple output voltages?Answer: The TPS54335ADDAR is designed for a single output voltage, but it can be used in multi-output configurations with additional converters.
19. What is the typical efficiency of the TPS54335ADDAR?Answer: The typical efficiency is around 95%, but this varies based on input voltage, output voltage, and load conditions.
20. What is the thermal shutdown threshold for the TPS54335ADDAR?Answer: The thermal shutdown threshold is typically 150°C, at which point the device will automatically shut down to protect itself from overheating.
This document provides a detailed explanation of the TPS54335ADDAR, including pin functions, usage, and common FAQs.
