NCP3218 NCP3218A PWM Controller ICs

The NCP3218 / NCP3218A PWM Controller IC from onsemi (ON Semiconductor) is a compact, high-efficiency power management solution for DC-DC buck and VRM applications on laptop and desktop motherboards. Both variants are used to regulate critical power rails for CPUs, GPUs, and chipsets, offering stable voltage control and fast transient response under dynamic load conditions.

NCP3218A is the revised silicon version of NCP3218, providing minor internal improvements (stability/tuning) while maintaining the same application area and footprint. For repair work, exact suffix matching is recommended where specified by the board design. All units supplied by OKSpare are quality tested before dispatch.

Technical Specifications (Applicable to NCP3218 & NCP3218A)

• PWM controller for synchronous DC-DC buck converters

• Designed for CPU, GPU, and chipset power regulation

• Fast transient response for dynamic load changes

• High-efficiency power conversion

• Integrated protections: OVP, UVP, OCP

• NCP3218A: revised A-version with improved stability

• Same footprint (check board requirement for exact variant)

• Compact QFN package suitable for motherboard power sections