Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general high-frequency PCB design guidelines, such as using a solid ground plane, minimizing trace lengths, and using vias to connect the ground plane to the thermal pad.
To ensure stability, it's essential to follow the recommended compensation network and component values, and to ensure that the output capacitor is properly sized and placed close to the output pin. Additionally, the input capacitor should be placed close to the input pin, and the feedback resistors should be placed close to the output pin.
The maximum input voltage that can be applied to the LMP8640 is 42V, but it's recommended to operate the device within the recommended input voltage range of 2.7V to 36V to ensure optimal performance and reliability.
The output voltage ripple of the LMP8640 can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where Iout is the output current, ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
The thermal resistance of the LMP8640 package is typically around 30°C/W for the junction-to-ambient thermal resistance (RθJA) and 10°C/W for the junction-to-case thermal resistance (RθJC). However, the actual thermal resistance may vary depending on the specific application and PCB design.
LMP8640MKX-H/NOPB datasheet
by Texas Instruments
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