Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general high-frequency PCB design guidelines, such as keeping the power traces short and wide, using a solid ground plane, and minimizing vias and thermal reliefs.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. A general rule of thumb is to choose a capacitor with a capacitance value of at least 10uF to 22uF, and a voltage rating of at least 1.5 times the output voltage. Additionally, consider the capacitor's ESR, ESL, and ripple current rating.
While the datasheet specifies a maximum input voltage of 5.5V, it's recommended to derate the input voltage to 5V or lower to ensure reliable operation and to prevent damage to the device.
The TPS54429PWP has a built-in OCP feature that can be enabled by connecting the OCP pin to a resistor divider network. The OCP threshold can be set by selecting the appropriate resistor values. Additionally, the device also has a hiccup mode that can be enabled to prevent damage during overcurrent conditions.
The TPS54429PWP has a thermal derating of -1.5%/°C above 25°C. This means that the device's output current capability will decrease as the temperature increases. It's essential to consider this derating when designing the system to ensure reliable operation.
TPS54429PWP datasheet
by Texas Instruments
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