Texas Instruments provides a recommended PCB layout in the TPS7H1111MPWPT application note (SLVAE04) that includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The output capacitor selection depends on the output voltage, output current, and desired transient response. TI recommends using a low-ESR capacitor with a value between 10uF to 100uF, and a voltage rating at least 1.5 times the output voltage. The TPS7H1111MPWPT datasheet provides a detailed capacitor selection guide.
Although the datasheet specifies a maximum input voltage of 5.5V, it's essential to consider the voltage rating of the specific package and the operating conditions. For the TPS7H1111MPWPTSEP, the maximum input voltage is 5.25V, and it's recommended to keep the input voltage below 5V to ensure reliable operation.
To ensure stability, follow the recommended PCB layout, use a low-ESR output capacitor, and add a 10nF to 100nF ceramic capacitor between the VIN and GND pins to filter out high-frequency noise. Additionally, avoid using long traces and minimize the distance between the input and output capacitors.
The typical dropout voltage of the TPS7H1111MPWPTSEP is around 200mV to 300mV, depending on the output current and input voltage. This means that the input voltage should be at least 200mV to 300mV higher than the output voltage to ensure proper regulation.
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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.
