A good PCB layout for the LMZ12002EXTTZE/NOPB involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the input and output traces. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure the device operates within the recommended operating conditions, make sure to provide a stable input voltage within the recommended range (2.7V to 5.5V), keep the ambient temperature within the recommended range (-40°C to 125°C), and avoid exceeding the maximum junction temperature (150°C).
The recommended input capacitor value is 10uF to 22uF, and a low-ESR ceramic capacitor (X5R or X7R dielectric) is recommended. The capacitor should be placed as close to the VIN pin as possible.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout x Rload) / (f x Cout), where Iout is the output current, Rload is the load resistance, f is the switching frequency, and Cout is the output capacitance.
The recommended output capacitor value is 10uF to 22uF, and a low-ESR ceramic capacitor (X5R or X7R dielectric) is recommended. The capacitor should be placed as close to the VOUT pin as possible.
LMZ12002EXTTZE/NOPB datasheet
by Texas Instruments
