The maximum input voltage that can be applied to the LTC3523EUD is 18V, but it's recommended to keep it below 15V for optimal performance and reliability.
To optimize inductor selection, consider the inductor's saturation current, DC resistance, and core loss. A good starting point is to choose an inductor with a saturation current at least 1.5 times the maximum output current, and a DC resistance less than 100mΩ.
To minimize noise and EMI, keep the input and output capacitors close to the IC, use a solid ground plane, and keep the high-frequency switching nodes (e.g., LX and SW) away from sensitive analog nodes. Also, use a shielded inductor and orient it to minimize radiation.
The output voltage of the LTC3523EUD can be adjusted by changing the resistive divider ratio of the feedback resistors (RFBT and RFBG). Use the formula VOUT = 0.8V x (1 + RFBT/RFBG) to calculate the desired resistor values.
The thermal derating of the LTC3523EUD is 30mW/°C above 70°C. To calculate the maximum power dissipation, use the formula PDMAX = (TJMAX - TA) / θJA, where TJMAX is the maximum junction temperature (150°C), TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance (45°C/W).
LTC3523EUD#PBF datasheet
by Linear Technology
