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Infineon Technologies 111-4043PBF
- Part No.:
- 111-4043PBF
- Manufacturer:
- Infineon Technologies
- Category:
- Power Management - Specialized
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
111-4043PBF.pdf
- Description:
- IC CTRL XPHASE3 VR11.0 32-MLPQ
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IR3500A from Infineon Technologies is a VR11.0 and AMD PVID-compatible multiphase voltage regulator controller IC that manages system-level power sequencing, dynamic VID control, and per-phase coordination with xPHASE3™ Phase ICs. It delivers 0.5% system set-point accuracy, programmable 250 kHz–1.5 MHz per-phase switching via ROSC resistor, and integrated remote sensing with <50 µA bias current - used in high-performance CPU/GPU VRMs on server and workstation motherboards.
For engineers reviewing the IR3500A datasheet, IR3500A pinout, IR3500A application, or IR3500A equivalent, key selection considerations include its dual-protocol VID support (AMD 5/6-bit and Intel VR11 with/without 1.1 V boot), programmable load line impedance via VDRP/FB RC network, VRHOT thermal monitoring interface, and centralized overvoltage protection with communication to phase ICs.
Technical Context
The IR3500A implements a master-slave architecture where it serves as the central control IC coordinating up to X xPHASE3™ Phase ICs via daisy-chained PHSIN/PHSOUT signals and CLKOUT timing distribution. Its error amplifier features 30 MHz bandwidth and 12 V/µs slew rate for fast transient response in high-current digital loads.
It supports dual VID protocols through hardware-configurable VIDSEL pin thresholds (0.48–0.75 V for AMD 5-bit, 0.85–1.15 V for AMD 6-bit, 2.97–3.63 V for VR11), and integrates dedicated circuitry for open-sense-line detection, OC delay counter scaling with ROSC value, and VCCL linear regulator control with 91–99% UVLO start threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| System Set-Point Accuracy | ±0.5% deviation across 0.3–1.55 V output range - ensures tight regulation under dynamic CPU load transitions. |
| Per-Phase Switching Frequency | 250 kHz to 1.5 MHz, set by ROSC resistor (7.75 kΩ to 50 kΩ) - enables optimization of efficiency vs. size in multi-phase buck converters. |
| Error Amplifier Bandwidth | 20–40 MHz typical - supports rapid correction of output voltage deviations during nanosecond-scale load steps. |
| Remote Sense Bias Current | <50 µA on VOSEN+ and VOSEN− - minimizes IR drop error in long PCB traces between VRM and processor socket. |
| VRHOT Threshold | 1.584–1.616 V at HOTSET - interfaces directly with NTC thermistor networks to trigger thermal shutdown before power stage overheating. |
| OC Delay Counter Scaling | 1024–4096 cycles depending on ROSC value - provides adjustable overcurrent response time matching phase count and switching frequency. |
| PGOOD Under-Voltage Hysteresis | 25–95 mV - prevents false power-good assertion during marginal output recovery after load transients. |
Pinout & Package
IR3500A is housed in a thermally enhanced 32-lead MLPQ package (5 mm × 5 mm body, 0.5 mm pitch), optimized for high-power density VRM layouts with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID7–VID0 (1–8) | VID code inputs | Accept parallel digital voltage identification codes for VR11 or AMD PVID protocols; input thresholds depend on VIDSEL configuration. |
| ENABLE (9) | Global enable control | Logic-high active; 775–875 mV threshold for VR11, 1.05–1.3 V for AMD - defines startup sequence and fault latching behavior. |
| VRHOT (10) & HOTSET (11) | Thermal monitor interface | Open-collector output driven low when HOTSET voltage falls below 1.6 V; connects to NTC-based voltage divider for temperature-dependent shutdown. |
| VOSEN+ (13) & VOSEN− (12) | Remote sense differential inputs | Measure true load voltage at CPU socket; internal amplifier rejects common-mode noise and draws <50 µA to minimize trace IR error. |
| IIN (18) | Current-summing input | Receives average phase current signals from xPHASE3™ Phase ICs; also carries overvoltage alert pulses to slave devices. |
| VDRP (17) | Load line programming node | Buffered copy of IIN; connected to FB via RC network to implement programmable output impedance (droop) for current-sharing stability. |
| ROSC/OVP (23) | Oscillator timing & OVP input | Resistor-to-ground sets per-phase switching frequency and bias currents; also receives overvoltage signal from phase ICs for centralized protection. |
| PHSIN (27) & PHSOUT (26) | Daisy-chain phase synchronization | Enable cascaded timing alignment across multiple Phase ICs without external clock fanout buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-protocol VID support | Hardware-selectable AMD 5/6-bit PVID or Intel VR11 (with/without 1.1 V boot) via VIDSEL pin voltage thresholds - eliminates firmware reconfiguration for platform reuse. |
| Programmable dynamic VID slew rate | Set via capacitor on VDAC pin - controls voltage transition speed during frequency scaling to prevent overshoot/undershoot in CPU core domains. |
| Centralized overvoltage protection | Single OVP comparator monitors VDAC reference and communicates trip condition to all Phase ICs via IIN line - ensures coordinated shutdown without per-phase latency mismatch. |
| Open remote sense line detection | Active comparator triggers if VOSEN+ drops below 87.5% of VCCL or VOSEN− exceeds 440 mV - prevents erroneous regulation due to broken sense connections. |
| VCCL linear regulator control | Internal LDO output (VCCLDRV) with programmable UVLO (91–99% of VCCL) and 10–30 mA sink capability - powers external gate drivers or logic with stable bias. |
Applications
| Server CPU VRM | Workstation GPU Power Delivery |
|---|---|
|
Use Scenario: High-current, multi-phase voltage regulation for dual-socket Xeon Scalable processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Master controller managing up to 8 xPHASE3™ Phase ICs, coordinating dynamic VID updates, load-line droop, and thermal shutdown via VRHOT. Use Value: Enables <1% output voltage deviation under 100 A/µs load steps while maintaining VR11.0 compliance and reducing board area by 30% versus discrete controller + driver solutions. |
Use Scenario: Precision power delivery to NVIDIA A100 or AMD MI250X GPU modules requiring strict voltage tolerance and thermal derating. IC Role / Device Role / Timing Role: Centralized control unit interfacing with GPU's PVID bus, regulating output via remote sense, and triggering VRHOT shutdown at 95°C junction temperature. Use Value: Delivers 0.5% set-point accuracy across −40°C to +85°C ambient, with open-sense-line detection preventing catastrophic undervoltage during thermal pad delamination. |
| High-End Desktop Motherboard | AI Accelerator Module |
|
Use Scenario: Enthusiast-grade AM5/Intel LGA1700 motherboard supporting DDR5 memory and PCIe 5.0 lanes with aggressive power management. IC Role / Device Role / Timing Role: VRM controller implementing adaptive load-line compensation via VDRP/FB RC network and dynamic VID slew control during Precision Boost Overdrive events. Use Value: Reduces output ripple to <5 mVpp under 60 A transient load, with PGOOD hysteresis preventing BIOS reset loops during brief voltage sags. |
Use Scenario: Compact AI inference card (e.g., Cerebras WSE-2 or Graphcore GC200) requiring tightly regulated core voltage with minimal BOM count. IC Role / Device Role / Timing Role: Single-chip solution providing VID decoding, current sensing aggregation, and centralized OVP - eliminating need for separate current-sense amplifiers and protection logic. Use Value: Achieves 94% peak efficiency at 400 W with 32-pin MLPQ footprint, enabling full power delivery in 75 mm × 50 mm module space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201 | Successor with VR12.0/IMVP8 support, integrated MOSFET drivers, and enhanced telemetry (I²C/PMBus); lacks VRHOT pin and uses different VIDSEL logic. | Targets newer platforms requiring PMBus configuration and digital telemetry; not drop-in compatible due to pinout and protocol changes. | Select for designs needing firmware-updatable parameters and bidirectional communication - not for VR11.0 or AMD PVID legacy systems. |
| TPS53679 | Texas Instruments part with 6-bit VID only, no AMD 5-bit mode; includes integrated 5-V LDO and different OVP architecture (no ROSC/OVP shared pin). | Designed for Intel-only client platforms; requires redesign of sense network and thermal interface due to missing VRHOT/HOTSET pins. | Choose when targeting cost-sensitive consumer notebooks with fixed VID protocol and no requirement for AMD compatibility or NTC-based thermal shutdown. |
Compared with IR3500A, IR35201 adds digital configurability but removes analog thermal monitoring, while TPS53679 simplifies BOM for Intel-only use but sacrifices AMD support and centralized OVP signaling - making IR3500A uniquely suited for mixed-protocol, thermally critical server VRMs.
Availability
IR3500A is available at Aetrix Electronics and suitable for server CPU VRMs, workstation GPU power delivery, high-end desktop motherboards, and AI accelerator modules requiring stable component supply and long-term industrial lifecycle support.
Supply support for IR3500A 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 global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The IR3500A belongs to Infineon's xPHASE™ VR controller family, designed specifically for high-efficiency, multi-phase CPU/GPU voltage regulation in datacenter and high-performance computing platforms with strict VR11.0 and AMD PVID compliance requirements.
FAQ
What VID protocols does the IR3500A support, and how is selection configured?
The IR3500A supports both AMD 5-bit/6-bit PVID and Intel VR11.0 protocols. Selection is determined by the voltage applied to the VIDSEL pin: 0.48–0.75 V enables AMD 5-bit mode, 0.85–1.15 V enables AMD 6-bit mode, and 2.97–3.63 V enables VR11.0 with boot-to-1.1 V capability. VIDSEL must not be left floating and is typically tied via resistor divider to LGND or VCCL.
How does the IR3500A implement load-line (droop) compensation?
Load-line compensation is implemented using the VDRP pin - a buffered copy of the IIN current-sum signal - connected to the FB pin via an external RC network. This creates a controlled voltage drop proportional to output current, ensuring stable current sharing across parallel phases and preventing oscillation in multi-phase configurations.
Can the IR3500A operate without external Phase ICs?
No. The IR3500A is a master controller only and requires at least one compatible xPHASE3™ Phase IC (e.g., IR3548A) to drive high-side/low-side MOSFETs. It provides no gate drive outputs; all PWM generation and MOSFET control occur in the Phase ICs, coordinated via PHSIN/PHSOUT and CLKOUT signals.
What is the function of the ROSC/OVP pin, and how does it affect system timing?
The ROSC/OVP pin serves dual functions: connecting a resistor to LGND sets the oscillator frequency (250 kHz–1.5 MHz per phase) and scales bias currents for OCSET, VSETPT, and VDAC; simultaneously, it receives overvoltage alerts from Phase ICs. This integration eliminates separate timing and protection signal routing, enabling deterministic OVP response synchronized to switching edges.
111-4043PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- XPhase3™
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Processor
- Current - Supply:
- 6.5mA
- Voltage - Supply:
- 4.75V ~ 7.5V
- Operating Temperature:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-MLPQ (5x5)
111-4043PBF FAQ
1.How can I place an order for 111-4043PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for 111-4043PBF 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 111-4043PBF reliable?
The price and inventory of 111-4043PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 111-4043PBF is usually 5 days.
3.What payment methods are accepted for 111-4043PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 111-4043PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 111-4043PBF?
111-4043PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 111-4043PBF 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 111-4043PBF?
For technical support, including 111-4043PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 111-4043PBF requirements.
6.How does Aetrix verify that 111-4043PBF is sourced from the original manufacturer or authorized distributors?
All 111-4043PBF 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 111-4043PBF meets industry standards.
7.What is the process for return or replacement of 111-4043PBF?
All 111-4043PBF units undergo pre-shipment inspection (PSI). If there is an issue with 111-4043PBF, 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 111-4043PBF part is unused and in its original packaging.
Return procedure for 111-4043PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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