As the demand for energy-efficient computing, high-speed telecommunications, and electric mobility scales exponentially, the underlying power delivery architectures must undergo rapid optimization. Within any DC-DC converter topology—whether it is a Buck, Boost, or Resonant LLC converter—the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) functions as the core switching element. Designing a custom MOSFET tailored explicitly for DC-DC converters addresses the critical balance between conduction losses ($I^2R$) and dynamic switching losses ($V \cdot I \cdot f_{sw} \cdot t$).
SEO Insight & Information Gain: Standard off-the-shelf MOSFETs suffer from standardized gate charges ($Q_g$) and drain-to-source on-resistances ($R_{DS(on)}$) that often lead to compromises in high-frequency designs. Custom tuning of the gate charge to internal source resistance ratio allows power supply designers to push operational switching frequencies above 1 MHz without suffering severe thermal degradation.
The global market for power MOSFETs in DC-DC conversion applications is undergoing a major transition. According to industry analyses, the growing adoption of distributed power architectures in cloud data centers (shifting from 12V to 48V bus architectures) and the rapid deployment of electric vehicle (EV) onboard chargers and auxiliary power modules are driving high-volume demand. Furthermore, stricter environmental regulations (such as Energy Star and 80 PLUS Titanium specifications) require converters to achieve peak efficiencies exceeding 96%. Consequently, semiconductor companies must focus on optimizing Silicon (Si) architectures to their absolute physical limits while exploring wide-bandgap (WBG) integration pathways.
HONGKONG Olukey INDUSTRY CO., LIMITED is a solution provider focusing on the overall solution of electronic product components. The main products mainly include: WINSOK MOSFET, Cmsemicon MCU, PCBA circuit board solution development and other three types of product lines.
At present, the products of Olukey Industry are widely used in automotive electronics, military electronics, smart industry, new energy, smart medical care, 5G, Internet of Things, smart home, and various consumer electronics products. Relying on the advantages of global general agents of major original factories, we are based in the Asia-Pacific market. We provide customers with various advanced high-tech electronic components by using comprehensive superior services, assisting manufacturers in producing high-quality products and providing comprehensive support.
When engineering high-frequency DC-DC converters, selecting the proper packaging and voltage thresholds is critical. Olukey Industry leverages the comprehensive design capabilities of WINSOK MOSFETs to customize key performance indicators. Below is an overview of technical parameters comparing custom optimized features with general-purpose industry components.
| Parameters | Standard Industry MOSFET | Winsok Custom MOSFET Solution | Primary Design Advantage |
|---|---|---|---|
| On-Resistance ($R_{DS(on)}$) | High (>8.5 mΩ at 10V) | Low (<2.2 mΩ to 4.5 mΩ) | Drastically lowers $I^2R$ conduction loss |
| Gate Charge ($Q_g$) | 45 nC - 60 nC | 12 nC - 25 nC | Enables fast switching, cuts driver losses |
| Reverse Recovery Charge ($Q_{rr}$) | High (Slow Body Diode) | Optimized Fast-recovery Diode | Minimizes voltage ringing and EMI issues |
| Thermal Resistance ($R_{thJC}$) | 1.8 °C/W (Standard TO) | 0.5 - 1.1 °C/W (DFN5x6 / DFN3x3) | Excellent heat dissipation, compact design |
By adjusting the internal die geometries, trench density, and gate oxide thicknesses, WINSOK custom MOSFETs achieve a highly favorable Figure of Merit (FOM = $R_{DS(on)} \times Q_g$). This optimization is particularly effective in synchronous buck converters, where the high-side control FET demands minimal switching losses and the low-side sync FET requires exceptionally low $R_{DS(on)}$.
We use comprehensive high-quality services to provide customers with various types of advanced high-tech electronic components, assist manufacturers in producing high-quality products and provide comprehensive services. Over the years, the company has relied on reputation to survive, adhering to the tenet of "quality first, service first", and has established good cooperative relationships with many high-tech enterprises and original manufacturers at home and abroad.
Relying on the advantages of global general agents of major original manufacturers, we are based on the Asia-Pacific market. Through active market development and effective resource integration, we have become one of the outstanding and fast-growing agents in the Asia-Pacific region. The company has many years of professional distribution experience. We use our comprehensive advantageous services to provide customers with various types of advanced high-tech electronic components, assist manufacturers in producing high-quality products and provide comprehensive services.
WINSOK MOSFET's product voltages are mainly medium and low voltage: 15V, 20V, 30V, 40V, 60V, 80V, 100V, 120V, 150V, 200V, 250V, 300V, 400V, 500V, 600V, 650V. The main packages include DFN3X3-8, DFN5X6-8, TO-252, TO-263, SOP-8, SOT-23, TO-220, etc. There are more than 600 models and more than 40 packages. Extensive coverage of medium-voltage and low-voltage MOSFET product lines on the market.
Cmsemicon MCU is a microcontroller company born in Shenzhen, with rich product types and technology research and development experience. Becoming a global high-value agent is the common goal pursued by OLUKEY Industrial employees. We adhere to the corporate values of "Pragmatism, Win-win, Service and Responsibility", continue to strengthen service quality, and aim to provide high-quality services. Work hand in hand with suppliers to jointly explore a larger market and contribute to the prosperity and development of semiconductors.
The power management sector is currently experiencing a double evolution. On one hand, designers are optimizing standard silicon MOSFET processes; on the other hand, wide-bandgap (GaN and SiC) devices are gaining traction. However, due to cost-efficiency and package maturity, customized low $R_{DS(on)}$ silicon MOSFETs remain the preferred choice for DC-DC converters operating between 15V and 250V.
The transition from 12V to 48V electrical systems in hybrid and battery electric vehicles (HEV/BEV) requires highly reliable MOSFETs. Custom packages such as dual-channel DFN5x6 or TO-263-7L help withstand extreme thermal fluctuations and transient load-dump conditions.
5G small cells and edge processing equipment demand compact brick-converters. DFN3X3-8 and SOP-8 dual MOSFET packages from WINSOK minimize design footprints, enabling high power densities for thermal-envelope restricted environments.
With USB-PD (Power Delivery) 3.1 supporting up to 240W, charger units require intelligent buck-boost stages. Custom sub-30V MOSFETs ensure high-efficiency conversion, preventing excessive heat in wall adapters.
Looking toward the 2026–2030 horizon, the silicon MOSFET roadmap focuses heavily on package-level improvements. Custom top-side cooled packages (TSC) are being engineered to allow heat sinks to sit directly on top of the copper lead frames, bypass-cooling the PCB. Additionally, Olukey Industry and WINSOK are continuous in refining trench gate structures to lower the gate-to-drain capacitance ($C_{gd}$), reducing switching transient losses in ultra-high frequency converters.
A synchronous buck converter uses a high-side control FET and a low-side sync FET. Standard catalog parts optimize neither. A custom approach designs the high-side FET with exceptionally low gate charge (Qg) to cut switching loss, and the low-side FET with ultra-low on-resistance (RDS(on)) to minimize conduction losses, maximizing system efficiency.
DFN (Dual Flat No-lead) packages significantly reduce parasitic package inductance compared to leaded TO-220 packages. Lower parasitic inductance reduces voltage ringing and EMI at high switching frequencies, while the exposed pad provides low thermal resistance (RthJC) to the PCB.
A higher Qg requires more current from the gate driver to charge the gate capacitance within the target switching time. Selecting a customized low-Qg MOSFET reduces the drive-current requirement, lowering driver thermal loads and permitting higher operating frequencies.
WINSOK MOSFETs offer pin-compatible equivalents to major global brands (such as Infineon, ON Semi, Vishay, etc.) with competitive electrical characteristics. This helps manufacturers secure supply lines, lower bill-of-materials (BOM) costs, and optimize thermal performance.
WINSOK MOSFETs cover medium and low voltages starting from 15V up to 650V. This wide coverage makes them suitable for low-voltage consumer devices, 48V telecom equipment, and high-voltage industrial power supplies.
Olukey Industry provides integrated design-in support, combining WINSOK MOSFETs, Cmsemicon MCUs, and customized PCBA development services. This holistic approach ensures component compatibility, optimizes thermal layout, and shortens time-to-market.
Olukey