The circuit in Figure 1 is a complete PD power supply circuit with a DC-DC converter that can provide a current of up to 0.85A when outputting a voltage of 12V. The MAX5953A has built-in high-side and low-side power switching FETs. The low-side FET cannot be configured as a synchronous rectifier diode. Therefore, buck converters only use high-side FETs. Because the current limiting circuit inside the IC operates using the voltage drop generated by the low-side FET current, this circuit does not have an automatic current limiting function. When starting up, fuse F1 provides short circuit protection. 
Figure 1. PD schematic including a 12V, 0.85A buck converter
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