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Infineon Technologies IR3531MTRPBF
- Part No.:
- IR3531MTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- Power Supply Controllers, Monitors
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
IR3531MTRPBF.pdf
- Description:
- IC OUTPUT CTRL 4+1 PHASE 48MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,163
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Product details
Overview
IR3531MTRPBF from Infineon Technologies is a 4+1 phase dual-output voltage regulator controller IC for high-efficiency, high-transient-performance CPU/GPU core power delivery. It supports up to 210W total output, delivers 0.5% system set-point accuracy, enables SVID margining on both rails, and integrates a 6.8V/0.8A bias buck regulator. Used in server VRMs with PowIRstages or discrete IR3535 drivers.
For engineers reviewing the IR3531MTRPBF datasheet, IR3531MTRPBF pinout, IR3531MTRPBF application, or IR3531MTRPBF equivalent, key selection criteria include dual-rail SVID compliance, body-braking™ and Turbo™ transient response features, 250 kHz–1.5 MHz per-phase frequency programmability, and thermal compensation via single NTC.
Technical Context
The IR3531 implements voltage-mode modulation with non-linear transient enhancement (Turbo™ for load-on, Body Braking™ for load-off), enabling fast response without complex loop tuning. It uses tri-state PWM outputs for diode emulation and supports sink/source tracking across two independent output rails.
Current sensing is performed per-phase via IINx inputs and reported through IMON/IMON_R1 pins; thermal compensation and over-current protection are derived from a shared TSENS network and VDRP/VDRP1 signals. The controller communicates with host processors via SVID (VCLK/VDIO/ALERT#/VRHOT#) and supports dynamic phase shedding via PHSSHED.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual rail: 4-phase + 1-phase (asymmetric 4+1 topology for core + SoC or I/O rail) |
| Switching Frequency Range | 250 kHz to 1.5 MHz per phase, synchronized via external SCLK or internal ROSC resistor |
| System Accuracy | ±0.5% overall set-point accuracy including DAC, feedback, and thermal drift compensation |
| Bias Regulator | Integrated 6.8V/0.8A buck converter for powering control/driver ICs - eliminates external bias supply |
| Protection Features | Over-current (per-phase & rail), over-voltage, over-temperature, open remote sense, open-loop detection |
| Thermal Compensation | Single NTC thermistor input (TSENS) used for current reporting, OC threshold scaling, and load-line compensation |
| SVID Compliance | Full SVID v3.0 support: margining, ALERT#, VRHOT#, VRRDY#, dynamic VID updates, and address programming (ADDR pin) |
Pinout & Package
IR3531MTRPBF is housed in a thermally enhanced 48-pin MLPQ package (7 mm × 7 mm, 0.5 mm pitch), with exposed thermal pad for PCB-level heat dissipation. Pin layout optimized for multi-phase layout symmetry and remote-sense routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Global enable input | Active-high logic input; grounding disables all regulators - must be pulled high or driven, not floated |
| PWM1–PWM4, PWM_R1 | Phase gate drive outputs | Tri-state PWM outputs for Rail0 (4 phases) and Rail1 (1 phase); connect to driver IC inputs or LGND to disable phase |
| IIN1–IIN4, IIN_R1 | Per-phase current monitor inputs | Accept current-sense signals from PowIRstages or IR3535 drivers; enable per-phase current sharing and reporting |
| VDRP / VDRP1 | DCR-compensated current signal outputs | Buffered, scaled, thermally compensated current mirrors used to program output impedance via FB/FB1 resistors |
| TSENS | Thermal network interface | Analog input for single NTC thermistor - feeds thermal compensation, OC threshold scaling, and load-line adjustment |
| VCLK / VDIO / ALERT# / VRHOT# | SVID bus interface | Standard SVID v3.0 signaling: clock/data bidirectional, interrupt/alert, and thermal alert outputs for host processor coordination |
Key Features
| Feature | Design Value |
|---|---|
| Voltage Mode Modulation | Stable loop design with predictable transient behavior - avoids instability risks of current mode at high bandwidth |
| Turbo™ Transient Response | Automatic full-phase activation during load step-up minimizes undershoot - no host intervention required |
| Body Braking™ | Low-side MOSFET forced turn-off during load step-down accelerates inductor energy dissipation - reduces overshoot |
| Sink/Source Tracking | Independent rail tracking capability enables precise voltage sequencing between core and I/O rails during startup/shutdown |
| Pre-bias Start-up | Safe start-up into pre-charged output capacitors - prevents reverse current flow and system latch-up |
Applications
| Server CPU Core VRM | AI Accelerator Power Delivery |
|---|---|
Use Scenario: High-current, low-voltage core supply (e.g., 0.8–1.2 V @ up to 120 A) for x86 or Arm-based server CPUs. IC Role / Device Role / Timing Role: Primary 4-phase controller managing DCR-based current sensing, SVID communication, and Turbo™/Body Braking™ transient response. Use Value: Enables sub-10 mV regulation deviation under 50 A/µs load steps while maintaining <1% droop via 0.5% system accuracy and thermal load-line compensation. | Use Scenario: Dual-rail power for GPU/AI ASIC requiring independent core (VDD) and memory interface (VDDQ) supplies with tight tracking. IC Role / Device Role / Timing Role: Dual-output controller delivering 4+1 phase configuration - 4 phases for VDD, 1 phase for VDDQ - with sink/source tracking and SVID margining. Use Value: Achieves ±2 mV tracking between rails during dynamic load changes using dedicated TRACK/TRACK1 references and synchronized PWM timing. |
| High-Density Storage Controller | Network Processor VRM |
Use Scenario: Compact, high-efficiency 12 V input-to-core conversion for NVMe SSD controllers or RAID-on-chip SoCs. IC Role / Device Role / Timing Role: Integrated bias regulator powers auxiliary circuitry; 4+1 architecture supports burst-mode operation and deep power savings via PHSSHED-controlled phase shedding. Use Value: Reduces BOM count by eliminating external bias supply and enables >90% efficiency at 20% load via diode emulation and adaptive phase control. | Use Scenario: Multi-rail power for programmable network processors requiring strict voltage sequencing, margining, and thermal monitoring. IC Role / Device Role / Timing Role: SVID-compliant controller providing VDD, VDDIO, and auxiliary rails with VRHOT# thermal alert, ALERT# fault signaling, and per-rail current telemetry. Use Value: Supports real-time thermal throttling and firmware-driven voltage margining - critical for packet processing stability under variable workloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35203MTRPBF | 6+1 phase, higher current capability (up to 300W), adds PMBus v1.3 support and digital telemetry | Targeted at next-gen servers requiring telemetry logging, black-box fault capture, and tighter PMBus integration | Select when digital diagnostics, long-term health monitoring, or PMBus host control are required - not drop-in compatible due to pinout and protocol differences |
| UCC39461PWR | 4+1 phase, analog-only interface (no SVID), fixed 500 kHz switching, no Turbo™/Body Braking™ | Designed for cost-sensitive industrial or telecom systems where SVID is unnecessary and transient performance requirements are relaxed | Choose for analog-control legacy designs or where SVID complexity and advanced transient features are not needed |
Compared with IR35203MTRPBF and UCC39461PWR, the IR3531MTRPBF uniquely balances SVID compliance, analog flexibility, and proprietary transient acceleration - making it optimal for mainstream server and AI accelerator VRMs where firmware control and analog robustness coexist.
Availability
IR3531MTRPBF is available at Aetrix Electronics and suitable for server motherboard design, AI accelerator power subsystems, and high-density storage controller development requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.
Supply support for IR3531MTRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in high-efficiency power delivery solutions.
The IR35xx family targets high-performance computing power systems - designed specifically for server, data center, and AI hardware requiring precision voltage regulation, SVID compliance, and intelligent transient response.
FAQ
What is the function of the PHSSHED pin?
The PHSSHED pin is an analog input (0–VCC) that dynamically controls phase shedding: 0–25% VCC enables all phases, 25–50% disables one phase, 50–75% disables two, and 75–100% disables three. It allows host firmware or thermal management logic to reduce power loss during light-load conditions while maintaining regulation stability.
Does IR3531MTRPBF support remote sensing on both outputs?
Yes - IR3531MTRPBF provides full differential remote sensing for both rails: VOSEN+/VOSEN− for Rail0 and VOSEN1+/VOSEN1− for Rail1. Each pair connects directly to the load point to compensate for PCB trace resistance, ensuring accurate voltage regulation at the point-of-load.
How does the integrated bias regulator operate?
The integrated 6.8V/0.8A buck regulator uses SW and VCC pins internally, with VCC serving as both output and bias supply for internal circuitry. It eliminates the need for an external 6.8V source, simplifying board layout and reducing BOM count - especially beneficial when powering companion IR3535 drivers or PowIRstages.
Can IR3531MTRPBF be used without SVID communication?
Yes - SVID is optional. The controller supports standalone analog operation using fixed VID resistors on ADDR pins and manual configuration of ROSC, ICCP, and TRACK references. All core regulation, protection, and transient features remain fully functional without SVID host interaction.
IR3531MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Dual Power Supply Controller
- Voltage - Input:
- 10.8V ~ 13.2V
- Voltage - Supply:
- 6.6V ~ 7V
- Current - Supply:
- 7 mA
- Operating Temperature:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-MLPQ (7x7)
IR3531MTRPBF FAQ
1.How can I place an order for IR3531MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3531MTRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IR3531MTRPBF reliable?
The price and inventory of IR3531MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3531MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3531MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3531MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3531MTRPBF?
IR3531MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3531MTRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IR3531MTRPBF?
For technical support, including IR3531MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3531MTRPBF requirements.
6.How does Aetrix verify that IR3531MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3531MTRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IR3531MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3531MTRPBF?
All IR3531MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3531MTRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IR3531MTRPBF part is unused and in its original packaging.
Return procedure for IR3531MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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