Texas Instruments provides a recommended PCB layout in the TPS79918 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.
To ensure stability, follow the recommended component values and PCB layout guidelines in the datasheet. Additionally, ensure that the output capacitor has a low equivalent series resistance (ESR) and is placed close to the output pin. A minimum output capacitance of 1 μF is recommended. If oscillations occur, try increasing the output capacitance or adding a small ceramic capacitor in parallel with the output capacitor.
The maximum input voltage for the TPS79918 is 12 V. However, it's recommended to operate the device within the specified input voltage range (2.3 V to 10.5 V) to ensure optimal performance and reliability.
Yes, the TPS79918 is suitable for powering microcontrollers. Its low dropout voltage (typically 230 mV at 1 A) and low quiescent current (typically 2 μA) make it an efficient and reliable choice. However, ensure that the output voltage and current meet the microcontroller's requirements, and follow proper power-up and power-down sequencing to prevent damage or malfunction.
Power dissipation can be calculated using the formula: Pd = (Vin - Vout) x Iout. The junction temperature can be estimated using the thermal resistance (RθJA) and the power dissipation. The datasheet provides the RθJA value and a thermal derating curve to help estimate the junction temperature. Ensure that the junction temperature remains within the specified operating range (−40°C to 125°C) to prevent overheating and damage.
TPS79918DDCRG4 datasheet
by Texas Instruments
