The TPS5401DGQR is a part of Texas Instruments (TI), a well-known semiconductor company. This component is a DC-DC buck converter, primarily designed to provide regulated output voltages for various applications, such as Power ing circuits from a higher voltage source.
Detailed Pin Function Specifications and Circuit Principle Instructions:
Packaging: The TPS5401DGQR comes in a VQFN-20 package, which stands for Very Thin Quad Flat No-lead (VQFN) with 20 pins. This is a surface-mount package that is designed for compact circuit designs. Pin Function Description (for 20 pins): Pin Number Pin Name Pin Type Pin Function Description 1 VIN Input This pin is for the input voltage, typically between 4.5V and 60V. 2 PGND Ground Power Ground pin for the internal circuitry. 3 SW Output Switch pin for the internal switching transistor , connecting to the external inductor. 4 VOSENSE Feedback Voltage feedback pin to sense the output voltage, connecting to a voltage divider. 5 VOUT Output Output voltage pin. This is where the regulated output voltage is provided. 6 COMP Control External compensation pin for the control loop, used to stabilize the feedback loop. 7 FREQ Control Frequency setting pin, used to select the switching frequency. 8 EN Enable Enable input, used to turn the device on or off. 9 SS Control Soft-start pin, used to set the soft-start period of the output voltage. 10 PGOOD Output Power Good status output, indicating the correct output voltage. 11 BOOT Power Bootstrap pin to supply voltage for the internal high-side switch. 12 NC No Connect Not connected to any internal circuitry, should be left open. 13 VIN Input Duplicate input voltage pin for convenience. 14 PGND Ground Duplicate ground pin for convenience. 15 SW Output Duplicate switch pin for convenience. 16 VOSENSE Feedback Duplicate feedback pin for convenience. 17 VOUT Output Duplicate output pin for convenience. 18 COMP Control Duplicate compensation pin for convenience. 19 FREQ Control Duplicate frequency setting pin for convenience. 20 EN Enable Duplicate enable pin for convenience.Circuit Principle:
TPS5401DGQR is a buck converter. It steps down a higher input voltage to a regulated lower output voltage. The internal switching transistor is controlled by feedback from the output voltage, with the switching frequency adjustable through the FREQ pin. The COMP pin helps stabilize the feedback loop and ensures that the output voltage remains stable and within regulation. The PGOOD pin provides an indicator of whether the output voltage is within the acceptable range. When the output is within a specified range, PGOOD will be high.FAQs for the TPS5401DGQR:
What is the maximum input voltage for the TPS5401DGQR? The maximum input voltage is 60V.
What is the output voltage range of the TPS5401DGQR? The output voltage range is 0.8V to 15V, adjustable via external resistors.
Can the TPS5401DGQR operate without external components? No, it requires external components like an inductor, capacitor , and resistors to set the output voltage.
What is the switching frequency of the TPS5401DGQR? The switching frequency is typically set between 250 kHz and 1 MHz, adjustable using the FREQ pin.
**What is the function of the *EN* pin?** The EN pin enables or disables the converter. When high, the device is enabled; when low, it is disabled.
**What is the *PGOOD* pin used for?** The PGOOD pin indicates the status of the output voltage. It is high when the output voltage is within range.
**What is the purpose of the *SS* pin?** The SS pin controls the soft-start time, which limits inrush current when the device is powered up.
What is the typical application for the TPS5401DGQR? It is typically used in applications requiring a step-down DC-DC converter, such as power supplies for microcontrollers, FPGA s, and other digital circuits.
Can the TPS5401DGQR be used for higher current applications? No, it is designed for applications up to 1A. For higher current, you should choose a different device like the TPS54xx series.
What is the minimum input voltage required for the TPS5401DGQR to function properly? The minimum input voltage is 4.5V.
What is the maximum output current the TPS5401DGQR can provide? The maximum output current is 1A.
How does the TPS5401DGQR handle thermal issues? It has thermal shutdown protection, which disables the converter if the junction temperature exceeds safe limits.
Is the TPS5401DGQR capable of synchronizing with an external clock? No, it does not have external synchronization capability. It operates at the fixed or adjusted frequency set by the FREQ pin.
What is the efficiency of the TPS5401DGQR? The efficiency can be up to 90% depending on the input voltage, output voltage, and load conditions.
Does the TPS5401DGQR have over-current protection? Yes, it has cycle-by-cycle current limit protection.
Can I use the TPS5401DGQR to convert from 5V to 3.3V? Yes, the TPS5401DGQR can step down 5V to 3.3V with proper feedback resistors.
How should I design the external components for the TPS5401DGQR? You need to select an appropriate inductor, input/output capacitors, and feedback resistors based on the desired output voltage and current.
**What is the function of the *BOOT* pin?** The BOOT pin is used to supply voltage to the high-side switch during operation.
Can I use the TPS5401DGQR in automotive applications? Yes, it can be used in automotive applications as long as the input voltage is within the specified range (4.5V to 60V).
What is the typical soft-start time for the TPS5401DGQR? The soft-start time is typically controlled by an external capacitor on the SS pin, with values ranging from a few milliseconds to a few seconds depending on the capacitor size.
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