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Infineon Technologies IR3531AMTRPBF
- Part No.:
- IR3531AMTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- Power Supply Controllers, Monitors
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
IR3531AMTRPBF.pdf
- Description:
- IC OUTPUT CTRL 4+1 PHASE 48MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
IR3531AMTRPBF from Infineon Technologies is a 4+1 phase dual-output voltage regulator controller IC for high-efficiency, high-density CPU/GPU 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 drivers.
For engineers reviewing the IR3531AMTRPBF datasheet, IR3531AMTRPBF pinout, IR3531AMTRPBF application, or IR3531AMTRPBF equivalent, key selection criteria include dual-rail SVID compliance, body-braking transient response, thermally compensated current sensing via single NTC, and 48-pin MLPQ package compatibility with multi-phase layout constraints.
Technical Context
The IR3531A implements voltage-mode modulation with Body Braking™ to rapidly dissipate inductor energy during load turn-off, improving transient response. It supports sink/source tracking across two independent outputs (Rail0: 4-phase, Rail1: 1-phase) and uses tri-state PWM outputs for diode emulation at light loads.
Current reporting, over-current protection, and load-line thermal compensation are all derived from a single NTC thermistor connected to TSENS. Synchronization is achieved via external SCLK input, enabling adjustable switching frequency per phase from 250 kHz to 1.5 MHz using the ROSC/OVP resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual rail: 4-phase + 1-phase (Rail0/Rail1), supporting asymmetric load distribution |
| Switching Frequency Range | 250 kHz – 1.5 MHz per phase, set by ROSC resistor or synchronized to external SCLK |
| System Accuracy | ±0.5% overall set-point accuracy including DAC, feedback, and sensing path errors |
| Bias Regulator | Integrated 6.8V/0.8A buck converter powers control/driver ICs, reducing external BOM count |
| Thermal Compensation | Single NTC thermistor provides OC threshold, current reporting, and load-line compensation for both rails |
| Protection Features | Over-current, over-voltage, over-temperature, open remote sense, and open-loop detection |
| SVID Compliance | Full SVID 3.0 support including margining, ALERT#, VRHOT#, and VRRDY signaling |
Pinout & Package
Thermally enhanced 48-lead 7 mm × 7 mm MLPQ (Exposed Pad) package with exposed thermal pad for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Global enable input | Active-high logic; grounding shuts down all regulators - must be tied to defined voltage, not floated |
| PWM1–PWM4 (Pins 27,28,34,35) | Rail0 phase drive outputs | Tri-state PWM signals; connecting any to LGND disables that phase for flexible 1–4 phase operation |
| PWM_R1 (Pin 48) | Rail1 phase drive output | Single PWM output for 1-phase Rail1; supports tracking and margining independently |
| VDRP / VDRP1 (Pins 16,45) | DCR current-sense compensation outputs | Buffered, scaled, thermally compensated current signals used with FB/FB1 to program output impedance |
| TSENS (Pin 33) | Thermal network interface | Analog input for single NTC thermistor shared between both rails for OC threshold and load-line compensation |
| IMON / IMON_R1 (Pins 13,12) | Load current monitor outputs | Voltage proportional to Rail0/Rail1 load current; fed to internal ADC for SVID IOUT reporting |
| BBR# / BBR1# (Pins 26,36) | Body Braking™ control buses | Assert low to disable low-side MOSFETs during load step-off - critical for fast transient recovery |
Key Features
| Feature | Design Value |
|---|---|
| Body Braking™ Transient Control | Automatically disables low-side MOSFETs at load turn-off to dissipate inductor energy faster, reducing undershoot by up to 40% vs. standard synchronous rectification |
| Dual-Rail SVID Margining | Independent ±1%, ±2%, ±3% voltage margining on both Rail0 and Rail1 via SVID commands without hardware change |
| Pre-bias Start-up Support | Allows safe startup into pre-charged output capacitors - essential for hot-swap and multi-rail sequencing |
| Soft Stop Functionality | Controls orderly shutdown of PWM outputs and bias regulator to prevent output voltage glitches during disable |
| Single NTC Thermal Integration | One thermistor serves OC threshold setting, current reporting scaling, and load-line compensation for both rails - reduces component count and layout area |
Applications
| Server CPU VRM | AI Accelerator Power |
|---|---|
Use Scenario: High-current, tightly regulated 0.8–1.2V core supply for dual-socket Xeon Scalable processors with dynamic load steps up to 100A/μs. IC Role / Device Role / Timing Role: Primary 4+1 phase controller coordinating PowIRstages, managing SVID communication with CPU, and executing real-time load-line compensation. Use Value: 0.5% set-point accuracy and Body Braking™ reduce voltage deviation to <±15mV during 80A load transients, meeting Intel VRD13.0 spec. | Use Scenario: Dual-rail power for GPU memory (1.35V) and compute core (0.75V) in datacenter AI accelerators with strict thermal envelope limits. IC Role / Device Role / Timing Role: Independent rail control with shared thermal sensing (TSENS) and synchronized phase shedding (PHSSHED) to balance power and temperature across rails. Use Value: Single NTC-based thermal compensation ensures accurate current reporting and OC protection for both rails under varying junction temperatures, avoiding derating. |
| Network Switch ASIC Supply | High-Density Storage Controller |
Use Scenario: Compact 200W power solution for 16nm/7nm switch ASICs requiring precise 0.95V core and 1.8V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Dual-output controller with sink/source tracking (TRACK/TRACK1) and SVID margining for factory calibration and field tuning. Use Value: Adjustable 250kHz–1.5MHz switching allows optimization for efficiency (low fSW) or size (high fSW), supporting 4-layer PCB designs with ≤12mm² footprint. | Use Scenario: Multi-rail power for NVMe SSD controllers with bursty 12V-to-1.1V conversion demands and thermal constraints in 1U chassis. IC Role / Device Role / Timing Role: 4+1 phase architecture supplies main core rail while bias regulator (VCC/SW) powers auxiliary LDOs and monitoring circuitry. Use Value: Integrated 6.8V/0.8A bias buck eliminates need for external bias supply, reducing BoM cost and improving startup reliability under cold ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multi-phase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35203MTRPBF | 6+1 phase, higher current capability (up to 300W), no integrated bias regulator | Targeted at higher-power CPUs (e.g., EPYC); requires external 6.8V bias supply | Select when >210W total output or >6-phase operation is required; verify external bias design |
| TPS53689RTAT | 4+1 phase, D-CAP3 control, no SVID margining, integrated MOSFET drivers | Designed for TI ecosystem; lacks VRHOT#/VRRDY signaling and single-NTC thermal integration | Select for cost-sensitive industrial applications where SVID compliance and advanced thermal features are not mandatory |
Compared with IR35203MTRPBF and TPS53689RTAT, the IR3531AMTRPBF uniquely combines SVID-compliant dual-rail margining, integrated bias regulation, and single-NTC thermal management - making it optimal for space-constrained, thermally demanding server and AI accelerator VRMs where firmware interoperability and layout simplicity are critical.
Availability
IR3531AMTRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, AI accelerator power modules, and high-density network switch ASIC supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IR3531AMTRPBF 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 SVID-compliant, multi-phase CPU/GPU VRMs with emphasis on transient response, thermal intelligence, and system-level interoperability.
FAQ
What is the function of the PHSSHED pin?
PHSSHED (Pin 11) is an analog input that scales phase count based on voltage level: 0–25% VCC enables all 4 phases, 25–50% disables 1 phase, 50–75% disables 2, and 75–100% disables 3. This enables dynamic phase shedding for efficiency optimization under light loads without firmware intervention.
Does IR3531AMTRPBF support pre-bias start-up?
Yes - the IR3531A supports pre-bias start-up on both rails. It detects existing output voltage before enabling PWM outputs and sequences soft-start to avoid reverse current flow into pre-charged capacitors, ensuring safe operation in hot-swap and multi-rail systems.
How is current sensing implemented for both rails?
Current sensing uses DCR-based methods with dedicated VDRP/VDRP1 outputs and IMON/IMON_R1 monitor pins. Each rail's current signal is thermally compensated via a shared NTC on TSENS, eliminating separate thermistors while maintaining accuracy across temperature for both rails' OC protection and telemetry.
Can IR3531AMTRPBF operate without an external SVID master?
Yes - it supports standalone operation using internal reference (VDAC/VDAC1) and fixed-frequency mode (ROSC resistor). SVID functionality (margining, ALERT#, VRHOT#) is optional; basic regulation remains fully functional with only analog inputs (TRACK, FB, VOSEN) and PWM outputs active.
IR3531AMTRPBF 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)
IR3531AMTRPBF FAQ
1.How can I place an order for IR3531AMTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3531AMTRPBF 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 IR3531AMTRPBF reliable?
The price and inventory of IR3531AMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3531AMTRPBF is usually 5 days.
3.What payment methods are accepted for IR3531AMTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3531AMTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3531AMTRPBF?
IR3531AMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3531AMTRPBF 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 IR3531AMTRPBF?
For technical support, including IR3531AMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3531AMTRPBF requirements.
6.How does Aetrix verify that IR3531AMTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3531AMTRPBF 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 IR3531AMTRPBF meets industry standards.
7.What is the process for return or replacement of IR3531AMTRPBF?
All IR3531AMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3531AMTRPBF, 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 IR3531AMTRPBF part is unused and in its original packaging.
Return procedure for IR3531AMTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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