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Infineon Technologies IR3502MTRPBF
- Part No.:
- IR3502MTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- Power Management - Specialized
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
IR3502MTRPBF.pdf
- Description:
- IC XPHASE3 CONTROLLER 32-MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
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Product details
Overview
IR3502MTRPBF from Infineon Technologies is a VR11.0/VR11.1-compatible multi-phase voltage regulator controller IC designed for CPU core power delivery in high-performance computing platforms. It provides system-level control, daisy-chain phase timing, programmable 250 kHz–1.5 MHz per-phase switching, 0.5% system set-point accuracy, and integrated thermal/current monitoring via NTC thermistor and remote sense inputs.
For engineers reviewing the IR3502MTRPBF datasheet, IR3502MTRPBF pinout, IR3502MTRPBF application, or IR3502MTRPBF equivalent, this device is selected for precision VR11-compliant CPU power stages requiring dynamic VID slew control, hiccup overcurrent protection, open-sense-line detection, and thermally compensated current reporting in server/desktop motherboards.
Technical Context
The IR3502 implements a master controller architecture in XPHASE3™ systems, coordinating up to X phase ICs via PHSIN/PHSOUT daisy-chained timing signals without external interleaving components. Its error amplifier delivers 30 MHz bandwidth and 10 V/µs slew rate for fast transient response under load steps.
It integrates dual compensation paths: one for voltage loop (via VSETPT/FB/EAO) and another for droop-based current sharing (via VDRP/VN/IMON), with programmable load line impedance and constant-current soft-start limiting. The ROSC/OVP pin serves dual function-setting oscillator frequency (250 kHz–9 MHz) and latching overvoltage events above 105 mV relative to VDAC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| System Set-Point Accuracy | ±0.5% - ensures tight output voltage regulation across VID codes and temperature, critical for CPU VDD tolerance compliance. |
| Per-Phase Switching Frequency | 250 kHz to 1.5 MHz - programmable via ROSC resistor; higher frequencies enable smaller output inductors and faster transient response. |
| Error Amplifier Bandwidth | 30 MHz - enables sub-microsecond correction of output deviations, supporting high-speed CPU DVFS transitions. |
| VID Slew Rate | Programmable via RC on VDAC - controls rate of voltage change during dynamic VID updates to prevent overshoot/undershoot. |
| Thermal Compensation | Single NTC input (HOTSET/VRHOT) - adjusts OC threshold, current reporting, and droop based on power stage temperature. |
| Remote Sense Support | Differential VOSEN+/VOSEN− inputs with 3–9 MHz bandwidth - rejects PCB IR drop to maintain accurate load-point regulation. |
| Overvoltage Protection | 105–145 mV above VDAC during normal operation - fast OVP latch prevents CPU damage during transient faults. |
Pinout & Package
IR3502MTRPBF uses a thermally enhanced 32-lead MLPQ package (5 mm × 5 mm, 0.5 mm pitch), optimized for high-power density CPU VRMs with exposed thermal pad on underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 VID7–VID0 | Parallel digital VID input | Configures target output voltage per VR11.0/11.1 protocol; supports 8-bit resolution down to 6.25 mV LSB. |
| 9 ENABLE | Active-high enable input | Asserts fault mode when low; requires defined logic level-floating state is undefined and prohibited. |
| 10 VRHOT | Open-drain thermal alert output | Drives low when HOTSET voltage falls below 1.6 V, signaling overtemperature condition at power stage. |
| 12–13 VOSEN− / VOSEN+ | Differential remote sense inputs | Measure true load voltage; enable closed-loop regulation at point-of-load, rejecting PCB trace resistance effects. |
| 15 FB | Inverting input to error amplifier | Connects to feedback divider; sets DC operating point and stability via external compensation network. |
| 16 EAOUT | Error amplifier output | Drives external compensation network; maximum swing limited to 780 mV below VCCL for rail-to-rail compatibility. |
| 22 SS/DEL | Soft-start/delay timing capacitor | Controls startup ramp time (0.8–3.25 ms) and overcurrent delay counter reset; also programs constant-current limit during soft start. |
| 23 ROSC/OVP | Oscillator programming & OVP flag | Resistor sets per-phase switching frequency; voltage >1.6 V indicates active overvoltage event. |
| 25 CLKOUT | Master clock output | Frequency = per-phase switching frequency × number of phases; synchronizes multiple phase ICs. |
| 26 PHSOUT / 27 PHSIN | Daisy-chain phase timing interface | Enables precise phase interleaving without external timing components; eliminates skew between phases. |
| 29 IIN | Aggregate current monitor input | Receives summed current signals from all phase ICs; used for total load reporting and OCP communication. |
| 31 VRRDY | Open-drain VR ready indicator | Drives low during startup, fault, or open-loop condition; signals host processor when output is stable and valid. |
| 32 IMON | Load current proportional output | Voltage scales linearly with total output current; used for telemetry, thermal derating, and adaptive droop control. |
Key Features
| Feature | Design Value |
|---|---|
| Daisy-chain phase timing | Eliminates need for external clock buffers or delay lines-reduces BOM count and layout complexity in multi-phase designs. |
| Programmable dynamic VID slew rate | Prevents excessive voltage transients during CPU frequency scaling by limiting dV/dt of VOUT during VID code changes. |
| Hiccup overcurrent protection | Auto-retry behavior after fault clears-maintains system uptime while preventing MOSFET thermal runaway during sustained overload. |
| Open remote sense line detection | Monitors VOSEN+ and VOSEN− continuity independently; asserts fault if either line opens, ensuring safe fallback to local sensing. |
| Single NTC thermistor compensation | Unifies thermal management across current reporting, OC threshold, and droop coefficient-reduces component count vs. discrete sensors. |
Applications
| Server CPU Core VRM | Desktop High-End GPU Power |
|---|---|
|
Use Scenario: Dual-socket x86 server motherboard delivering 120 A+ to dual Intel Xeon Scalable processors under dynamic workload. IC Role / Device Role / Timing Role: Master controller managing up to 8 phase ICs, coordinating daisy-chained PHSOUT/PHSIN timing and centralized OVP/OC logic. Use Value: Enables compact, high-efficiency VRM design meeting VR11.1 spec with <0.5% set-point error and <2 µs transient recovery. |
Use Scenario: Enthusiast-class gaming motherboard powering NVIDIA RTX 4090 GPU with aggressive DVFS and thermal throttling. IC Role / Device Role / Timing Role: Voltage regulator controller implementing dynamic VID updates, NTC-based thermal droop, and remote sense at PCIe slot connector. Use Value: Delivers precise GPU VDD tracking during frame-rate spikes while maintaining safe junction temperatures via VRHOT-driven throttling. |
| Workstation CPU Power Delivery | AI Accelerator Board Supply |
|
Use Scenario: AMD Threadripper PRO workstation platform requiring stable 64+ phase power with strict ±10 mV ripple limits. IC Role / Device Role / Timing Role: Centralized control unit interfacing with multiple IR3520x phase ICs, using CLKOUT for global synchronization and IMON for real-time telemetry. Use Value: Achieves <1% total output deviation across full load range and temperature (-40°C to +105°C) via trim-compensated VDAC and EA offset cancellation. |
Use Scenario: PCIe-based AI inference card with dual ASICs drawing 200 W peak, requiring coordinated power sequencing and fault isolation. IC Role / Device Role / Timing Role: Primary VR controller enabling staggered startup via SS/DEL timing, open-loop protection, and VRRDY handshaking with host FPGA. Use Value: Guarantees reliable power-up sequence and rapid fault containment-prevents cascading failure across co-packaged accelerators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35203MTRPBF | Integrated MOSFET drivers; supports up to 6 phases natively; no external phase IC required. | Better suited for space-constrained designs where driver integration reduces board area and gate drive loop inductance. | Select when consolidating controller + driver functionality is prioritized over modular scalability with discrete phase ICs. |
| UCC3895PW | Analog PWM controller with fixed 100–1000 kHz frequency; no VID interface, no digital phase management, no thermal compensation. | Limited to legacy fixed-voltage or analog-programmed supplies; lacks VR11 compliance, remote sense, or NTC support. | Choose only for non-VID, non-VR11 applications where cost sensitivity outweighs feature requirements. |
Compared with IR35203MTRPBF, IR3502MTRPBF offers superior modularity and thermal intelligence but requires external phase ICs; versus UCC3895PW, it delivers full VR11.0/11.1 compliance, digital timing, and integrated telemetry-making it irreplaceable in modern CPU/GPU VRMs.
Availability
IR3502MTRPBF is available at Aetrix Electronics and suitable for server motherboard design, high-end desktop VRMs, and AI accelerator power delivery requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for IR3502MTRPBF 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 conversion solutions.
The IR3500/IR3502 product line was engineered specifically for VR11.0/11.1-compliant CPU core voltage regulation, emphasizing precision set-point accuracy, multi-phase coordination, and intelligent thermal-aware current management.
FAQ
What is the minimum recommended ROSC resistor value for stable 1.5 MHz per-phase operation?
The datasheet specifies ROSC = 7.75 kΩ for nominal 1.5 MHz PHSOUT frequency. Using a lower value risks exceeding absolute max ratings on ROSC/OVP pin and may cause oscillator instability or premature OVP triggering. Always verify with actual board layout parasitics and thermal derating.
Can IR3502MTRPBF operate without a remote sense connection?
Yes-it defaults to local sensing using VO and FB pins-but open-sense-line detection will assert fault, and VRRDY will remain low until VOSEN+ and VOSEN− are properly terminated. Remote sense is mandatory for VR11 compliance and guaranteed load-point regulation.
How does the VRHOT function interact with overcurrent protection?
VRHOT is independent of OCP: it monitors HOTSET voltage (derived from NTC thermistor) and pulls VRHOT low when temperature exceeds threshold. This signal can be used externally to throttle CPU clocks or disable phases-but does not trigger hiccup OCP or shut down the controller.
Is the IMON output calibrated for absolute current measurement?
No-IMON provides a voltage proportional to total output current, but its scale factor depends on external phase IC gain and RDS(on) calibration. For absolute current accuracy, system-level calibration against a shunt or current probe is required during production test.
IR3502MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- XPhase3™
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Processor
- Current - Supply:
- 8mA
- Voltage - Supply:
- 8V ~ 16V
- Operating Temperature:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-MLPQ (5x5)
IR3502MTRPBF FAQ
1.How can I place an order for IR3502MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3502MTRPBF 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 IR3502MTRPBF reliable?
The price and inventory of IR3502MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3502MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3502MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3502MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3502MTRPBF?
IR3502MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3502MTRPBF 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 IR3502MTRPBF?
For technical support, including IR3502MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3502MTRPBF requirements.
6.How does Aetrix verify that IR3502MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3502MTRPBF 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 IR3502MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3502MTRPBF?
All IR3502MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3502MTRPBF, 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 IR3502MTRPBF part is unused and in its original packaging.
Return procedure for IR3502MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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