The datasheet provides some general guidelines, but a good rule of thumb is to keep the input and output traces short and separate, use a solid ground plane, and place the device close to the power supply. Additionally, it's recommended to use a 4-layer PCB with a dedicated analog ground layer to minimize noise coupling.
The output capacitor value depends on the output voltage, output current, and desired ripple voltage. A good starting point is to use the formula provided in the datasheet, but it's also important to consider the ESR and ESL of the capacitor. A general rule of thumb is to use a capacitor with an ESR of less than 1 ohm and an ESL of less than 10nH.
The datasheet specifies a maximum input voltage of 15V, but it's recommended to derate this value by 10-20% to ensure reliable operation. Additionally, it's important to consider the voltage rating of the input capacitor and ensure that it can handle the maximum input voltage.
The LTC1264-7CN#PBF has a SYNC pin that can be used to synchronize the switching frequency of multiple devices. To do this, connect the SYNC pins of each device together and drive them with a common clock signal. This will ensure that the devices switch at the same frequency and reduce electromagnetic interference (EMI).
The thermal derating of the LTC1264-7CN#PBF is specified in the datasheet as a function of ambient temperature. As the ambient temperature increases, the maximum output current must be derated to prevent overheating. A good rule of thumb is to derate the output current by 1-2% per degree Celsius above 25°C.
LTC1264-7CN#PBF datasheet
by Linear Technology
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