Gigabyte Z77X-UD4H Motherboard
Voltage Regulator
Contents
The CPU voltage regulator circuit of the Gigabyte Z77X-UD4H has eight phases for the CPU main voltage (Vcc a.k.a. Vcore), two for the CPU VSA (a.k.a. system agent) voltage, and one for the embedded GPU (VAXG). Therefore, it uses an “8+2+1” configuration.
The voltage regulator is controlled by an IR3564 integrated circuit, which uses a digital design. For the main voltage and the VSA voltage, the motherboard uses one IR3598 integrated circuit instead of a discrete driver transistor. One integrated circuit is used per two phases, as each one has two MOSFETs inside. Two NTMFS4921N MOSFETs are used per phase as the “low side” and the “high side” transistors. On the single phase for the VAXG voltage, one RJK03B7DPA MOSFET is used as “driver” and two RJK0393DPA MOSFETs are used as “low side” and “high side.”
Figure 9: Voltage regulator circuit
The Gigabyte Z77X-UD4H uses solid electrolytic capacitors. All coils on this motherboard are ferrite-core models, which can provide up to 20% improvement in efficiency.
If you want to learn more about the voltage regulator circuit, please read our tutorial on the subject.
