A good PCB layout for the UCD90124RGCR involves keeping the power and ground planes separate, using a solid ground plane, and placing the decoupling capacitors close to the device. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
The recommended power-up sequence for the UCD90124RGCR is to first apply the 3.3V supply (VIN), followed by the 1.8V supply (VDD), and then the 0.9V supply (VDDA). The power-down sequence should be reversed.
The maximum allowed capacitance for the output capacitors on the UCD90124RGCR is 100 μF. Exceeding this value may cause instability in the output voltage.
The output voltage of the UCD90124RGCR can be adjusted by connecting a resistor divider network between the VOUT pin and the GND pin. The output voltage is determined by the ratio of the resistors in the divider network.
The thermal derating curve for the UCD90124RGCR is typically provided in the device's datasheet or application notes. It shows the maximum allowed power dissipation versus ambient temperature. For the UCD90124RGCR, the thermal derating curve indicates that the maximum power dissipation decreases as the ambient temperature increases.
UCD90124RGCR datasheet
by Texas Instruments
