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International Test Instruments Corporation IR3508ZMTRPBF
- Part No.:
- IR3508ZMTRPBF
- Manufacturer:
- International Test Instruments Corporation
- Category:
- Power Management - Specialized
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
IR3508ZMTRPBF.pdf
- Description:
- SWITCHING REGULATOR/CONTROLLER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IR3508ZMTRPBF from Infineon Technologies is a multiphase synchronous buck controller Phase IC designed for high-performance CPU/ASIC power delivery. It implements feed-forward voltage-mode PWM control, lossless inductor current sensing, and single-wire average current sharing across up to 8 phases. With 7V/2A high-side and 4A sink-capable low-side gate drivers, it supports converter output voltages up to 5.1 V (VCCL–1.4 V) in thermally enhanced 20-lead 4×4 mm MLPQ packaging.
For engineers reviewing the IR3508ZMTRPBF datasheet, IR3508ZMTRPBF pinout, IR3508ZMTRPBF application, or IR3508ZMTRPBF equivalent, this device is selected for multi-phase VRMs requiring PSI-enabled light-load efficiency optimization, daisy-chain phase timing control without external components, and integrated bootstrap PFET with anti-bias protection.
Technical Context
The IR3508Z operates as a slave Phase IC in XPhase3™ architecture, receiving DACIN reference, EAIN error signal, and IOUT current-share bus from a master Control IC. Its PWM comparator uses input-voltage–dependent ramp slope (42–57 mV/%DC) for feed-forward compensation, while self-calibrating current sense amplifier (±1 mV offset, 32.5 V/V gain) enables accurate per-phase current monitoring.
Phase timing is synchronized via 3-wire digital daisy chain (CLKIN/PHSIN/PHSOUT), with PHSOUT propagation delay of 4–35 ns at 125°C and CLKIN-to-GATEH delay of 40–125 ns. During PSI assertion, the device disables current sense amplifiers and bypasses phase-delay DFF to reduce output ripple while maintaining over-current protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| GATEH Drive | 40 V max rating, 2 A source/sink, 1.0–2.5 Ω on-resistance - drives high-side PFET with fast 5–10 ns edges |
| GATEL Drive | 8 V max rating, 4 A sink capability, 0.4–1.0 Ω sink resistance - ensures robust low-side NMOS turn-off under heavy load |
| Current Sense | Lossless inductor sensing, ±1 mV input offset, 32.5 V/V gain - delivers precise per-phase current feedback to Control IC |
| PWM Ramp Slope | 42–57 mV/%DC (Vin = 12 V) - dynamically adjusts for input rail variation to stabilize loop response |
| PSI Threshold | Rising: 520–700 mV; Hysteresis: 50–120 mV - enables deterministic entry/exit from light-load power-saving mode |
| Package | 20-lead MLPQ, 4 × 4 mm body, thermally enhanced - supports >200 mA DC PGND current and 5 A pulsed GATEL sink |
| Operating Temp | Junction range 0–125°C (recommended), storage –65–150°C - qualified for server CPU VRM environments |
Pinout & Package
IR3508ZMTRPBF is housed in a 20-lead, 4 × 4 mm MLPQ package with exposed thermal pad (PGND-connected). Pin 1 is marked by dot; pins 6, 11, and 20 are NC. LGND (Pin 4) and PGND (Pin 9) are separate ground returns for analog and power domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IOUT | Current sense amplifier output | Provides V(DACIN) + 33×(CSIN+−CSIN−); shared across phases for average current reporting and OVP detection |
| 2 PSI | Power State Indicator input | Active-low signal that disables current sense amps and bypasses DFF to optimize light-load ripple and efficiency |
| 3 DACIN | Reference voltage input | Establishes common-mode baseline for PWM ramp, current sense, and share adjust amplifiers |
| 5 PHSIN | Phase clock input | Receives daisy-chained timing signal from upstream device to align switching edge across interleaved phases |
| 7 PHSOUT | Phase clock output | Drives next phase IC's PHSIN with 4–35 ns propagation delay; completes closed-loop daisy chain |
| 10 GATEL | Low-side gate driver output | Drives NMOS source-follower or synchronous rectifier; sinks 4 A peak for fast turn-off |
| 12 VCCL | Low-side driver supply | Supplies GATEL and powers internal bootstrap PFET connected to BOOST pin |
| 13 BOOST | High-side driver supply | Bias rail for GATEH; supports 40 V max; internal PFET bootstraps from VCCL |
| 14 GATEH | High-side gate driver output | Drives PFET gate; 2 A source/sink, 5–10 ns edges; referenced to SW node |
| 15 SW | Switch node return | Reference for GATEH non-overlap comparator and BOOST supply; connects to inductor center tap |
| 17 CSIN+ | Current sense non-inverting input | Connects to inductor DCR or sense resistor high side; used for debug comparator |
| 18 CSIN− | Current sense inverting input | Connects to inductor DCR or sense resistor low side; also feeds sync rect disable comparator |
| 19 EAIN | Error amplifier input | Receives output of Control IC's EA; initiates body braking if voltage falls below DACIN |
Key Features
| Feature | Design Value |
|---|---|
| Feed-forward voltage-mode PWM | Input-voltage–adaptive ramp slope (42–57 mV/%DC) maintains loop stability across silver-box and PCB drop variations |
| Single-wire average current sharing | IOUT pins tied together form passive bus delivering weighted average current to Control IC for dynamic phase shedding |
| PSI-optimized light-load operation | Disables current sense amps and bypasses phase-delay DFF during PSI assertion to reduce ripple and improve efficiency |
| Integrated bootstrap PFET | Internal PFET between VCCL and BOOST eliminates external diode; reduces BOM count and improves startup reliability |
| Self-calibration | Automatically calibrates PWM ramp, current sense amp, and current share amp offsets at power-up and during PSI transitions |
Applications
| Server CPU VRM | ASIC Power Delivery |
|---|---|
|
Use Scenario: 8-phase VRM supplying 1.0–1.8 V @ 100+ A to dual-socket Xeon Scalable processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Slave Phase IC executing per-phase gate drive, current sensing, and daisy-chain timing synchronization under IR35203/IR35204 Control IC. Use Value: Enables adaptive voltage positioning (AVP) suppression and PSI-driven phase shedding to maintain >90% efficiency at 10% load. |
Use Scenario: 6-phase power stage for 7 nm AI accelerator ASIC with tight transient response requirements and remote sensing. IC Role / Device Role / Timing Role: Provides lossless DCR-based current monitoring and feed-forward PWM control synchronized via PHSIN/PHSOUT daisy chain. Use Value: Delivers <100 ns OVP propagation delay and ±1 mV current sense offset for accurate per-phase current balancing across temperature. |
| High-Density Telecom PSU | Industrial FPGA Power |
|
Use Scenario: Compact 4-phase 12 V input → 3.3 V/40 A VRM for baseband processing units in 5G macro radios. IC Role / Device Role / Timing Role: Implements synchronous rectification with GATEL/GATEH drivers and bootstrap PFET, reducing conduction losses vs. external diodes. Use Value: Achieves 4 A GATEL sink current and 0.4–1.0 Ω sink resistance to support fast NMOS turn-off during high dv/dt transients. |
Use Scenario: 3-phase 48 V input → 1.2 V/30 A power for Xilinx Versal ACAP in industrial edge gateway with extended temperature operation. IC Role / Device Role / Timing Role: Performs self-calibration of PWM ramp and current sense amplifier at startup and PSI transitions to maintain accuracy from –40°C to 105°C. Use Value: Supports 0–125°C junction operation with guaranteed 4–35 ns PHSOUT propagation delay and 15–70 ns OVP response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase Phase IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35203MTRPBF | Master Control IC with integrated VID decoder, clock generator, and EA - not a Phase IC; requires companion IR3508Z or IR3507Z | Cannot replace IR3508ZMTRPBF directly; serves complementary system-level control function | Select only when building full XPhase3™ system with ≥2 phases and need centralized VID, fault management, and daisy-chain initiation |
| ISL6367IRZ-T | Intersil 6-phase PWM controller with integrated MOSFET drivers; no separate Phase IC architecture; uses analog current balance instead of IOUT bus | Lacks PSI interface and daisy-chain timing; requires external current-sense resistors and phase-delay components | Prefer for cost-sensitive, fixed-phase-count designs where board space permits discrete current sensing and no light-load PSI optimization is needed |
Compared with IR3508ZMTRPBF, IR35203MTRPBF provides system-level control but cannot execute per-phase gate drive, while ISL6367IRZ-T integrates control and drive but sacrifices XPhase3™'s scalability, PSI efficiency gains, and lossless current sensing.
Availability
IR3508ZMTRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, ASIC power delivery systems, high-density telecom PSUs, and industrial FPGA power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for IR3508ZMTRPBF 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 global semiconductor leader specializing in power management, sensor, and automotive ICs, with core expertise in high-efficiency power conversion and intelligent control architectures.
The IR3508Z belongs to Infineon's XPhase3™ multiphase controller family, engineered specifically for scalable, high-current CPU/ASIC VRMs demanding precise current sharing, PSI-enabled efficiency, and daisy-chain timing without external timing components.
FAQ
What is the role of the PSI pin in IR3508ZMTRPBF operation?
The PSI (Power State Indicator) pin is an active-low input that triggers light-load power-saving mode. When asserted, the device disables its current sense amplifiers and bypasses the phase-delay DFF circuit to reduce output voltage ripple and improve efficiency. It also maintains over-current protection functionality during PSI mode, enabling seamless transition between full-load and idle states in CPU VRMs.
How does the IR3508ZMTRPBF achieve lossless current sensing?
IR3508ZMTRPBF implements lossless current sensing using the inductor's DC resistance (DCR) as the current-sense element. The CSIN+ and CSIN− pins connect across the DCR, feeding a high-precision current sense amplifier with ±1 mV input offset and 32.5 V/V gain. This eliminates the need for discrete sense resistors, reducing power loss and board area while maintaining accuracy across temperature.
Can IR3508ZMTRPBF operate without a companion Control IC?
No. IR3508ZMTRPBF is a dedicated Phase IC and requires a master Control IC such as IR35203 or IR35204 to provide DACIN reference voltage, EAIN error signal, CLKIN system clock, and VID interface. It lacks internal oscillator, VID decoder, and system-level fault management logic - all functions reside in the Control IC, with IR3508Z handling only per-phase gate drive, current sensing, and timing relay.
What is the maximum supported number of phases in an XPhase3™ system using IR3508ZMTRPBF?
XPhase3™ architecture supports up to eight IR3508ZMTRPBF Phase ICs per Control IC, enabled by the 3-wire digital daisy-chain (CLKIN/PHSIN/PHSOUT) that propagates timing signals with ≤35 ns PHSOUT delay per stage at 125°C. The Control IC detects phase count during power-up by monitoring PHSIN feedback after initiating the daisy chain loop.
IR3508ZMTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- International Test Instruments Corporation
- Series:
- XPhase3™
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Processor
- Current - Supply:
- 4mA
- Voltage - Supply:
- 8V ~ 28V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (4x4)
IR3508ZMTRPBF FAQ
1.How can I place an order for IR3508ZMTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3508ZMTRPBF 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 IR3508ZMTRPBF reliable?
The price and inventory of IR3508ZMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3508ZMTRPBF is usually 5 days.
3.What payment methods are accepted for IR3508ZMTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3508ZMTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3508ZMTRPBF?
IR3508ZMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3508ZMTRPBF 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 IR3508ZMTRPBF?
For technical support, including IR3508ZMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3508ZMTRPBF requirements.
6.How does Aetrix verify that IR3508ZMTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3508ZMTRPBF 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 IR3508ZMTRPBF meets industry standards.
7.What is the process for return or replacement of IR3508ZMTRPBF?
All IR3508ZMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3508ZMTRPBF, 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 IR3508ZMTRPBF part is unused and in its original packaging.
Return procedure for IR3508ZMTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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