Texas Instruments provides a recommended PCB layout in the TPS79901 datasheet, which includes guidelines for component placement, trace routing, and thermal management. Additionally, the TI website offers a PCB layout checklist and a layout guide for low-dropout (LDO) regulators like the TPS79901DDCTG4.
The output capacitor selection depends on the output voltage, output current, and desired transient response. A general guideline is to use a capacitor with a minimum capacitance of 2.2 μF and an ESR (equivalent series resistance) of less than 1 Ω. TI recommends using a ceramic capacitor with an X5R or X7R dielectric. The datasheet provides more detailed guidance on output capacitor selection.
The TPS79901DDCTG4 has an absolute maximum input voltage rating of 12 V. However, the recommended operating input voltage range is 2.3 V to 10.5 V. Exceeding the absolute maximum input voltage can damage the device.
To ensure stability, follow the recommended PCB layout guidelines, use a suitable output capacitor, and avoid long input and output traces. Additionally, ensure that the input voltage is within the recommended operating range, and the output current is within the specified limits. TI also provides a stability analysis tool to help designers evaluate the stability of their design.
The power dissipation of the TPS79901DDCTG4 depends on the input voltage, output voltage, and output current. The datasheet provides a power dissipation calculation formula. For thermal management, use a thermal pad on the bottom of the package, and ensure good thermal conductivity between the device and the PCB. TI recommends using a thermal via or a heat sink if necessary.
TPS79901DDCTG4 datasheet
by Texas Instruments
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