ISL99390FRZ-TR5935
The ISL99390FRZ-TR5935 is a Gen2 Smart Power Stage (SPS) DrMOS module from Renesas Electronics, delivering 90A continuous output current per phase. It integrates the high-side driver, low-side driver, and MOSFETs into a single compact PQFN package, with added SMBus/PMBus 1.3 digital telemetry providing real-time current and temperature monitoring. Designed for multi-phase buck converters paired with Renesas ISL68/69xxx digital multiphase controllers, it powers server Vcore rails, GPU VRMs, telecom DC-DC converters, and high-current FPGA/ASIC point-of-load applications — enabling scalable, high-efficiency power delivery from 90A to 900A+ with minimal BOM and PCB footprint.
Product Specifications
ISL99390FRZ-TR5935 - Renesas Gen2 Smart Power Stage (DrMOS), 90A, SMBus/PMBus
Renesas Electronics - 90A Continuous, 3V-16V Input, Integrated Driver + MOSFETs + Digital Telemetry, PQFN
MFR Part #: ISL99390FRZ-TR5935Superb SKU: SUP-ISL99390FRZ-TR5935
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The ISL99390FRZ-TR5935 is a Gen2 Smart Power Stage (SPS) DrMOS module from Renesas Electronics, delivering 90A continuous output current per phase. It integrates the high-side driver, low-side driver, and MOSFETs into a single compact PQFN package, with added SMBus/PMBus 1.3 digital telemetry providing real-time current and temperature monitoring. Designed for multi-phase buck converters paired with Renesas ISL68/69xxx digital multiphase controllers, it powers server Vcore rails, GPU VRMs, telecom DC-DC converters, and high-current FPGA/ASIC point-of-load applications — enabling scalable, high-efficiency power delivery from 90A to 900A+ with minimal BOM and PCB footprint.
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Key Performance Highlights
Continuous Output
90 A per Phase
Input Voltage
3 V to 16 V
Technology
Gen2 SPS DrMOS
Digital Interface
SMBus / PMBus 1.3
Telemetry
Current + Temperature
Package
PQFN (5 x 6 mm)
Technical Specifications
| Manufacturer | Renesas Electronics Corporation |
| Part Number | ISL99390FRZ-TR5935 |
| Device Type | Smart Power Stage (SPS) / DrMOS Module |
| Generation | Gen2 with integrated digital monitoring |
| Continuous Output Current | 90 A (per phase) |
| Input Voltage Range | 3 V to 16 V |
| Integration | Driver IC + High-Side MOSFET + Low-Side MOSFET(s) |
| Digital Interface | SMBus / PMBus 1.3 (per-phase telemetry) |
| Current Monitoring | High-accuracy per-phase output current reporting |
| Temperature Monitoring | Integrated temperature sensor with digital readout |
| Compatible Controllers | Renesas ISL68xxx / ISL69xxx DMP (Digital Multiphase) |
| Phase Doubler | Compatible with ISL6617A |
| Switching Frequency | Up to 1 MHz+ (multi-phase optimized) |
| Efficiency | 93%+ peak (12V to 1.8V typical) |
| Protections | Over-current, over-temperature, fault flag |
| Package | PQFN (5 mm x 6 mm), SMD |
| Packaging | Tape & Reel (TR5935 suffix) |
| RoHS | RoHS Compliant |
Product Details
Smart Power Stage Architecture
The ISL99390FRZ-TR5935 is a Gen2 Smart Power Stage — the evolution beyond traditional DrMOS. It integrates the complete buck converter power stage: high-side driver, low-side driver, control MOSFET, and synchronous MOSFET(s) with optimized dead-time control into a 5x6mm PQFN package.
Digital Telemetry: Unlike analog-only DrMOS, the Gen2 SPS adds SMBus/PMBus 1.3 interface for real-time per-phase current and temperature monitoring. This enables phase shedding for light-load efficiency, thermal balancing across phases, and predictive failure detection — all without external sense resistors or thermistors.
Multi-Phase Scalability: Each ISL99390 handles one phase at up to 90A continuous. Paired with a Renesas ISL68/69xxx digital controller (4-8 phases native) and optional ISL6617A phase doublers, you can build server-grade VRMs delivering 200A-900A+ with fully digital per-phase telemetry and adaptive voltage positioning (AVP).
Key Applications
Server Vcore VRMs - Intel/AMD CPU and DDR memory voltage regulators
GPU Power Delivery - AI accelerator cards, data center GPUs, gaming graphics
Telecom DC-DC Converters - 48V to point-of-load, network equipment power
FPGA / ASIC Core Rails - Low-voltage, high-current digital core supplies
Storage & Networking - SSD controllers, switch ASICs, baseboard management
Industrial Power Supplies - High-current POL converters, automated test equipment
Embedded Computing - COM Express, VPX, and other standard form-factor modules
Renesas DrMOS / Smart Power Stage Selection
| Part Number | Current | Digital Interface | Package | Typical Use |
|---|---|---|---|---|
| ISL99360FRZ-T | 60 A | SMBus/PMBus | PQFN 5x6 | Mid-range VRMs, consumer GPUs |
| ISL99390FRZ-TR5935 | 90 A | SMBus/PMBus | PQFN 5x6 | Server Vcore, GPU VRMs, telecom |
| ISL99227FRZ-T | 60 A | SMBus/PMBus | PQFN 5x6 | Cost-optimized, DDR memory |
| ISL99392FRZ-TR5935 | 90 A | SMBus/PMBus (master/individual temp) | PQFN 5x6 | Advanced thermal management |
Why Source ISL99390FRZ-TR5935 from Superb Automation?
Multi-Phase VRM BOM - Controller + Nx ISL99390 + inductors + capacitors + heatsink - one PO
High-Current PCB Design - 90A phase current routing, copper weight optimization, thermal via arrays
SMT Assembly + X-Ray - PQFN/power QFN reflow with void detection and thermal pad verification
PMBus/SMBus Validation - We can verify telemetry communication during production test
25 Years Trusted - Electronic components + PCBA partner since 2000
Genuine Parts - Direct from authorized Renesas channels, full lot traceability
Frequently Asked Questions
What is the ISL99390FRZ-TR5935 used for?
The ISL99390FRZ-TR5935 is a 90A Gen2 Smart Power Stage for multi-phase buck converters in server Vcore VRMs, GPU power delivery, telecom DC-DC, and high-current FPGA/ASIC point-of-load regulators. It integrates driver + MOSFETs + SMBus/PMBus telemetry in a 5x6mm PQFN package.
What is the difference between DrMOS and Smart Power Stage?
DrMOS (Driver + MOSFET) integrates driver and FETs into one module. Smart Power Stage (SPS) goes further by adding digital current and temperature monitoring via SMBus/PMBus. The ISL99390 is a Gen2 SPS — it provides per-phase telemetry that enables phase shedding, thermal balancing, and system health monitoring not possible with analog DrMOS.
How do I build a 4-phase, 8-phase, or 16-phase VRM?
Use a Renesas ISL68/69xxx digital multiphase controller (supports 4-8 phases natively). Each output connects to one ISL99390FRZ-TR5935. For 8+ phases, add ISL6617A phase doublers. A 4-phase design delivers 360A; 8-phase delivers 720A; 16-phase delivers 1,440A. PMBus telemetry reports individual phase current and temperature to the controller.
What does the PMBus interface provide?
The PMBus 1.3 interface provides per-phase: output current (high-accuracy), die temperature, fault/warning flags, device ID, and configuration registers. The digital controller uses this for phase shedding, thermal balancing, predictive failure detection, and input power monitoring — enabling intelligent, self-optimizing power delivery.
What PCB layout considerations apply to ISL99390?
For 90A per phase: use 2oz+ copper on power planes, place input capacitors as close as possible to the VIN and PGND pins, use multiple thermal vias under the exposed pad to inner ground planes, keep the switch node (LX) copper area minimal to reduce EMI, and route PMBus/SMBus signals away from high-current switching nodes. Renesas provides detailed layout guidelines in the ISL99390 application note.
