Core specifications
ISL99390FRZ-TR5935 belongs to Renesas' second-generation smart power stage product line, which integrates power MOSFET and gate driver in a single package.The key parameters are as follows:
Output capability:Support90A DC output current, is the industry-recognized high-performance DrMOS level current specification.
voltage range:Input voltage3V to 16V, compatible with 12V bus power supply, and the output voltage adapts to the 0.6V to 1.8V ultra-low voltage core power supply requirements of CPU/GPU/ASIC.
Current monitoring accuracy: Available over full range of line, load and temperatureBest-in-class current detection accuracy (±3%), combined with Renesas’ Digital PWM controller, achieves system-level precision power management and industry-leading transient response under load line regulation.
Switches and Packaging: Wide switching frequency range, supports high-density design, and adopts packagingPQFN-39（5mm×6mm×0.76mm）, Thermal enhanced design, pin spacing 0.5mm.
Protection and Compatibility: Integrated high-side MOSFET over-current protection, low-side short-circuit protection, intelligent reverse over-current protection, over-temperature protection and VCC under-voltage lockout.This model is compatible with 3.3V tri-state logic PWM digital controllers, while the BFRZ suffix version is compatible with a 5V tri-state logic PWM phase multiplier (ISL6617A).
environmental adaptability：Operating temperature-40℃ to 85℃, moisture sensitivity level MSL-3, compliant with RoHS environmental regulations.
Core advantages
The value of ISL99390FRZ-TR5935 in design is mainly reflected in three aspects: First, the 90A current carrying capacity means that when selecting the number of power supply phases for GPU, ASIC, and AI chips, fewer SPS devices can be used to output the same total power density, thus significantly saving server motherboard layout space.In NVIDIA H100 AI accelerator card, AMD EPYC and Intel Xeon processor platforms, this SPS is often used to build core power supply solutions with 8 to 12 or more phases to cope with sharply rising transient currents.In May 2026, this material once surged in the global server and AI computing markets, becoming a popular power chip that the industry is paying attention to.Secondly, the built-in ±3% high-precision current and temperature monitor directly eliminates the inductor DCR current sampling network and its thermal compensation components in the traditional solution, simplifying the system design and improving the linearity and consistency of current telemetry.The Renesas digital PWM controller and SPS perform handshake through a dedicated three-state PWM pin. Fault status and load overload conditions can be reported directly through the dedicated pin, which enhances the cooperative protection response when multi-phase parallel connection.Thirdly, the 5×6mm thermally enhanced package and PCB footprint are at the leading level among DrMOS devices with the same power capability, meeting the high integration requirements of AI accelerator cards and blade servers.
Typical application scenarios
ISL99390FRZ-TR5935 is mainly active in high power density scenarios in data centers and edge computing.
Server CPU/GPU core power supplyIt is its core application direction.As the demand for computing power from AI training and inference nodes skyrockets, the power consumption of CPUs and GPUs continues to increase, and multi-phase power supply circuits have extremely high requirements on the transient response and current balance of SPS.This device can be used with Renesas ISL68/69xxx digital polyphase controllers to build a Vcore power supply solution that supports hundreds or even thousands of amps.ISL99390 and Infineon TDA21490 are regarded as similar competing products and together constitute the main option of 90A DrMOS in the server market.
AI accelerator card and GPU clusterThis chip is also widely used.Among OCP open computing platforms and high-density AI servers, the ISL99390FRZ-TR5935 has become one of the most trusted SPSs in AI training cluster power supply design with its ±3% current detection accuracy and precise chip-level thermal management capabilities.The application areas have clearly covered accelerators (GPU, ASIC, artificial intelligence), core/graphics/memory power supply voltage regulators (VR) for microprocessors, high-density voltage regulators (VR) for servers/networks/cloud computing, as well as point-of-load (POL) DC/DC converters and video game consoles.
High performance computing and telecommunications infrastructureIn terms of power supply, it serves as a key component for power management in base station BBUs and core network equipment. Together with the Renesas digital multi-phase controller, it can flexibly build a complete solution from single-phase auxiliary power supply to multi-phase core power supply.Edge computing nodes in the industrial control sector also benefit from their high voltage and wide input and fully integrated security protection.
Related models and alternative references
ISL99390FRZ-TR5935 belongs to Renesas' second-generation smart power stage product line. The same series provides a wealth of PWM logic and current level branches for project selection.
Different PWM logic versions of the same series: ISL99390FRZ-TR5935 itself is adapted to the digital controller of 3.3V three-state logic PWM.If you need to adapt a phase multiplier (such as ISL6617A) to the 5V three-state logic PWM output, you should chooseISL99390BFRZ-TR5935, the package pins are fully compatible, only the PWM input logic voltage is different to meet the system integration of phase expansion circuit or traditional multi-phase interleaved parallel connection.
Selection of different current levels in the same series: If the total power requirement is reduced and the cost is more sensitive, you can chooseISL99380FRZ-TR5935(Class 80A) orISL99360FRZ-TS2568(60A class), the packaging and I/O definitions are consistent with the 90A version, and the power supply logic and supporting controller solutions are also unified.It can be used as a low-cost backup option in server auxiliary power supply, I/O power supply and other occasions.ISL99392BFRZ-TR5935 also belongs to a different branch of this series and can be referenced appropriately.
Supporting controller selection extension: In the server core power supply platform, the SPS is usually used with Renesas ISL682xx and ISL68/69xxx digital multi-phase controllers, including those that support 16-phase control.ISL68223, ISL68233 and other models.With phase multiplierISL6617AThe number of parallel phases can be further expanded to achieve large-scale joint power supply of dozens of phases.
Cross-brand compatible alternative reference: Competing products of the same level in this device market include Infineon’sTDA21490(90A intelligent power level), which is also the main option for CPU core power supply in Intel Sapphire Rapids and AMD EPYC server platforms.Because the package pin definitions and PWM input logic of each manufacturer are different, you need to carefully check the data sheet and conduct complete electrical verification when replacing.In addition, MPSMP86990Series and ADI'sLTC7050There is some overlap in functions and packaging between the series and ISL99390. When planning a replacement, be sure to pay attention to the differences in fault protection mechanisms and current monitoring accuracy.
write at the end
With 90A peak output, ±3% current detection accuracy, 3V to 16V wide voltage input and PQFN-39 compact package, Renesas ISL99390FRZ-TR5935 provides high-efficiency power conversion and accurate system monitoring benchmarks for high-density power supply designs of AI servers, GPU clusters and data centers.Aimed at typical occasions such as high-performance CPU/GPU power supply, multi-phase voltage reduction and point-of-load power supply, this second-generation intelligent power stage represents the industry-leading design benchmark in terms of power density, current accuracy and system protection.
As a chip agent distributor that has been deeply involved in the electronic components industry since 2011, Shenzhen Hongmai Electronics Co., Ltd. has long-term stock of Renesas ISL99390FRZ-TR5935 and ISL99390 series full models of smart power stages in original stock, and also provides supporting supplies.It supports ISL99380FRZ-TR5935, ISL99360FRZ-TS2568 and other branch models with different current levels, as well as peripheral components such as Renesas digital polyphase controllers and phase multipliers, and supports factory batch direct delivery, small batch samples and technical selection assistance.If you need to inquire or need selection suggestions for different PWM logic versions and current levels of the same series, please feel free to contact us (tel: 0755-23815611, QQ 2355878270).Shenzhen Hongmai Electronics Co., Ltd.
