View cs51312.rev1 datasheet:

CS51312 Synchronous CPU Buck Controller for 12V Only Applications Description Features The CS51312 is a synchronous dual The CS51312 is specifically designed Synchronous Switching NFET Buck Regulator Controller. It is to power Intel’s Pentium® II processor Regulator Controller for CPU VCORE designed to power the core logic of and includes the following features: the latest high performance CPUs and 5-bit DAC with 1.2% tolerance, Dual N-Channel MOSFET ASICs from a single 12V input. It uses Power-Good output, overcurrent hic- Synchronous Buck Design the V2TM control method to achieve cup mode protection, overvoltage V2TM Control Topology the fastest possible transient response protection, VCC monitor, Soft Start, 200ns Transient Loop Response and best overall regulation.