There are many members in the family of FS45&FS65, which you can choose the best for your application, you can see the rules of number definition and check the difference of different members from the picture below:                             More detailed, refer to :https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?&tab=Documentation_Tab&linkline=Data-Sheet

Hello, everyone , we have developed lots of resources to take you to the world of FS45&FS65, you can get what you want in the below form: MODEL NAME URL Development Kits KITFS4503CAEEVM https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/analog-toolbox/fs4503-system-basis-chip-linear-0.5a-vcore-fs1b-ldt-can:KITFS4503CAEEVM KITFS6522LAEEVM https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/analog-toolbox/fs6522-system-basis-chip-dcdc-2.2a-vcore-ldt-can-lin:KITFS6522LAEEVM? KITFS6523CAEEVM https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/analog-toolbox/fs6523-system-basis-chip-dcdc-2.2a-vcore-fs1b-ldt-can:KITFS6523CAEEVM? FRDMFS4503CAEVM https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/analog-toolbox/freedom-board-fs4503-system-basis-chip-ldo-500ma-vcore-fs1b-ldt-can:FRDMFS4503CAEVM FRDMFS6522LAEVM https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/freedom-development-boards/analog-and-power-management/frdmfs6522laevm-fs6522-system-basis-chip-dcdc-2.2a-vcore-fs1b-ldt-can:FRDMFS6522LAEVM FRDMFS6523CAEVM https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/fs6523-system-basis-chip-with-kl25z:FRDMFS6523CAEVM? Documentation Data Sheet https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?&tab=Documentation_Tab&linkline=Data-Sheet Fact sheet https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?tab=Documentation_Tab Application Note -  AN5238 https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?tab=Documentation_Tab Safety Manual https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?tab=Documentation_Tab Webinars Please contact local supporters Trainings Please contact local supporters Functional Safety Documentation Please contact local supporters FMEDA Please contact local supporters Tools Power dissipation tool https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/grade-1-and-grade-0-safety-power-system-basis-chip-with-can-flexible-data-transceiver:FS6500?tab=Design_Tools_Tab Flex GUI https://www.nxp.com/products/power-management/system-basis-chips/functional-safety-sbcs/fs6523-system-basis-chip-with-kl25z:FRDMFS6523CAEVM?tab=Design_Tools_Tab Compensation network calculator Please contact local supporters Simplis models Please contact local supporters Config decoder Please contact local supporters eFast Please contact local supporters SW Drivers Embedded SW: FS65/FS45 SW Driver | NXP