Texas Instruments provides a recommended layout and placement guide in the TPS25740BRGET Evaluation Module User's Guide (SLUUAC7). It's essential to follow this guide to ensure proper thermal performance, reduce electromagnetic interference (EMI), and prevent electrical overstress (EOS).
The input capacitor selection depends on the input voltage, output voltage, and output current. A general guideline is to choose a capacitor with a voltage rating of at least 1.5 times the maximum input voltage, and a capacitance value of 10uF to 22uF. Additionally, consider the capacitor's ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance) to ensure it can handle the high-frequency switching of the TPS25740BRGET.
The EN (Enable) pin is an active-high input that enables or disables the TPS25740BRGET. When EN is high, the device is enabled, and when EN is low, the device is disabled. You can use the EN pin to implement power sequencing, shutdown, or restart functionality in your system. Connect EN to a logic-level signal or a voltage source, and ensure it meets the specified voltage and timing requirements.
The TPS25740BRGET has a fixed output voltage of 3.3V, but you can adjust the output voltage using an external resistor divider network. Connect the VOUT pin to a resistor divider network, and calculate the resistor values based on the desired output voltage and the internal reference voltage (1.2V). Ensure the resistor values are within the specified range to maintain accuracy and stability.
The thermal derating curve is provided in the TPS25740BRGET datasheet and shows the maximum output current vs. ambient temperature. Use this curve to determine the maximum output current your design can handle at a given ambient temperature. For example, if your design operates at 50°C, the maximum output current might be 2A instead of the maximum 3A at 25°C.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
