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Infineon Technologies CHL8325A-03CRT
- Part No.:
- CHL8325A-03CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
CHL8325A-03CRT.pdf
- Description:
- IC REG BUCK 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
CHL8325A-03CRT from Infineon Technologies is a dual-loop, 5-phase digital multi-phase buck controller compliant with Intel® VR12 and AMD® SVI protocols, supporting DDR memory Vtt tracking, 200kHz–1.2MHz per-phase switching, IR Adaptive Transient Algorithm (ATA), and dual OCP for I-spike protection in high-performance CPU VRMs.
For engineers reviewing the CHL8325A-03CRT datasheet, CHL8325A-03CRT pinout, CHL8325A-03CRT application, or CHL8325A-03CRT equivalent, key selection considerations include VR12/SVI dual-loop compliance, programmable phase shedding (1/2-phase light-load mode), SMBus/PMBus telemetry support, Variable Gate Drive capability, and NVM-based configuration storage for platform-specific tuning.
Technical Context
The CHL8325A implements two independent voltage regulation loops with per-loop OVP/UVP/OCP/OTP/CFP fault protection and supports both Intel VR12 (VID-based) and AMD SVI (SVID-based) command interfaces. Its IR Adaptive Transient Algorithm uses non-linear digital PWM to reduce bulk capacitance requirements by up to 40% versus fixed-gain controllers.
It integrates a 10-bit voltage ADC, current-sense amplifiers for five phases, dual temperature sensing (TSEN + TSEN2 not present on CHL8325A), and a 3.3V LDO regulator. The VAR_GATE_PM_ADDR pin enables dynamic gate drive voltage adjustment based on real-time load current, improving efficiency at light and medium loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-loop digital multi-phase buck controller with up to 5 total phases assignable across loops |
| Input Voltage Range | +3.3V supply only; supports VINSEN monitoring for input rail telemetry |
| Switching Frequency | 200kHz to 1.2MHz per phase, programmable via PMBus or NVM |
| Compliance | Fully compliant with Intel VR12 and AMD SVI 400kHz/3.4MHz modes including Vtt tracking |
| Interface | I²C/SMBus/PMBus v1.2 with 16-device address space and register-level telemetry for voltage, current, temperature, and power |
| Memory | On-chip non-volatile memory (NVM) stores custom configuration, eliminating external EEPROM and reducing BOM count |
| Operating Temp | -20°C to +85°C ambient, qualified for desktop and overclocked platform use |
Pinout & Package
CHL8325A-03CRT is housed in a Pb-free, RoHS-compliant 6×6 mm, 40-pin QFN package (MSL2), with exposed thermal pad for enhanced power dissipation in high-current VRM applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM1–PWM5 | Phase gate drive outputs | Five independent PWM outputs driving external high-side MOSFETs; configurable per loop assignment |
| ISEN1–ISEN5 | Current sense inputs | Differential inputs for phase current sensing; enable per-phase OCP and adaptive transient response |
| VSEN / VSEN_L2 | Voltage feedback inputs | High-precision analog inputs for loop 1 and loop 2 output voltage monitoring and regulation |
| SMB_CLK / SMB_DIO | PMBus interface signals | Open-drain bidirectional data and clock lines supporting telemetry read/write and configuration updates |
| VAR_GATE_PM_ADDR | Gate drive control | Selects between PMBus-addressed gate drive voltage programming or fixed 1.8V/3.3V operation |
| TSEN | Temperature sensor input | Analog input for external NTC thermistor; used for thermal foldback and OTP protection |
| VR_READY_L11 / VR_READY_L21 | Power-good status outputs | Active-low open-drain signals indicating stable regulation on each loop; compatible with PWRGD/PWROK standards |
Key Features
| Feature | Design Value |
|---|---|
| IR Adaptive Transient Algorithm (ATA) | Reduces required output bulk capacitance by dynamically adjusting PWM gain during load transients, lowering system cost and footprint |
| Dynamic Phase Control | Automatically adds/drops active phases between 1–5 based on real-time load current, optimizing efficiency across 1–100% load range |
| Variable Gate Drive | Adjusts high-side MOSFET gate drive voltage (1.8V–3.3V) in real time to minimize switching losses without external components |
| Active Diode Emulation | Enables synchronous rectifier emulation during very light loads to eliminate reverse conduction loss in low-Iq operation |
| NVM Configuration Storage | Stores full device configuration-including loop parameters, fault thresholds, and timing-eliminating boot-time initialization overhead |
Applications
| Desktop CPU VRM | DDR Memory Vtt Tracking |
|---|---|
Use Scenario: High-end gaming and overclocked desktop platforms requiring precise, fast-response voltage regulation for Intel Core i7/i9 or AMD Ryzen CPUs. IC Role / Device Role / Timing Role: Dual-loop digital buck controller managing core (Vcore) and graphics (Vgt) rails with independent transient response and phase scheduling. Use Value: ATA algorithm reduces bulk capacitor count by ≥30%, while VR12/SVI compliance ensures plug-and-play compatibility with chipset reference designs. | Use Scenario: DDR4/DDR5 memory subsystems where Vtt must track half the VDDQ rail with tight tolerance and fast transient response. IC Role / Device Role / Timing Role: Secondary regulation loop generating Vtt from VDDQ with dedicated feedback path and independent OVP/UVP protection. Use Value: Integrated Vtt tracking function eliminates need for discrete op-amp circuitry and improves tracking accuracy to ±10 mV over temperature. |
| Gaming Platform Power Management | Server VR Hot Alert System |
Use Scenario: Enthusiast motherboards enabling manual Vmax override and dynamic overclocking profiles via BIOS or software tools. IC Role / Device Role / Timing Role: Configurable VR controller supporting Overclocking & Gaming Mode with user-defined voltage ceiling and phase activation thresholds. Use Value: Programmable Vmax setting prevents unsafe voltage excursions during manual tuning, while SMB_ALERT# provides hardware-level fault escalation. | Use Scenario: 1U/2U rack servers requiring thermal-aware power delivery with early warning of VR overheating before shutdown. IC Role / Device Role / Timing Role: Dual thermal sensing (TSEN + VR_HOT#1 assertion) enables predictive thermal throttling and coordinated platform-level thermal management. Use Value: VR_HOT#1 signal asserts before OTP trip, allowing host BMC to initiate fan ramp-up or frequency reduction with ≥200 ms margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-loop digital VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR3541MTRPBF | Same silicon die and pinout; differs only in default NVM configuration and part marking; identical electrical specs and feature set | No functional difference; IR3541 is Infineon's branded version of same device, commonly used in reference designs | Select IR3541MTRPBF when sourcing from Infineon's standard distribution channel or requiring Infineon-branded documentation and support |
| CHL8325B-00CRTY | Adds second temperature sense input (TSEN2) and VR12 Desktop-specific features; otherwise identical pinout and firmware interface | Required for VR12 Desktop compliance where dual thermal monitoring is mandated; not needed for server/gaming platforms | Choose CHL8325B-00CRTY only if platform certification requires VR12 Desktop thermal specification; CHL8325A suffices for all other VR12/SVI applications |
Compared with IR3541MTRPBF, CHL8325A-03CRT offers identical performance but targets OEM-customized configurations via NVM programming; versus CHL8325B, it omits TSEN2 to reduce cost and complexity where dual thermal sensing is unnecessary-making it optimal for gaming and general-purpose VRM designs.
Availability
CHL8325A-03CRT is available at Aetrix Electronics and suitable for desktop CPU VRMs, DDR memory Vtt tracking systems, and overclocked gaming platforms requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CHL8325A-03CRT 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 digital power conversion and energy-efficient solutions.
The CHL8325A belongs to Infineon's Digital Power Controller product line, designed specifically for high-efficiency, multi-phase voltage regulation in next-generation computing platforms requiring VR12/SVI compliance and intelligent thermal/power telemetry.
FAQ
Is CHL8325A-03CRT pin-compatible with IR3541?
Yes, CHL8325A-03CRT is fully pin-compatible with IR3541MTRPBF, sharing identical 40-pin QFN layout, electrical characteristics, and functional block diagram. Both devices use the same silicon die and differ only in factory-programmed NVM defaults and branding-no PCB redesign is required for substitution.
Does CHL8325A-03CRT support DDR5 Vddq/Vtt tracking?
Yes, CHL8325A-03CRT supports DDR5 Vtt tracking via its dedicated secondary loop (Loop 2) with programmable Vtt = VDDQ/2 ±10 mV tracking accuracy, real-time compensation, and independent OVP/UVP protection-fully meeting JEDEC DDR5 power delivery specifications for memory subsystems.
What configuration tools are supported for CHL8325A-03CRT?
CHL8325A-03CRT is configured using Infineon's IR Intuitive Power Designer (DPDC) GUI tool, which connects via USB-to-PMBus adapter to program NVM registers, define loop parameters, set fault thresholds, and validate telemetry-all without modifying hardware or firmware source code.
Can CHL8325A-03CRT operate in single-loop mode?
Yes, CHL8325A-03CRT supports single-loop operation via PMBus command or NVM configuration: Loop 2 can be disabled, consolidating all 5 phases into Loop 1 for high-current single-rail applications such as GPU VRMs or ASIC power supplies, retaining full ATA, DPC, and telemetry functionality.
CHL8325A-03CRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- PWM
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 5
- Output Phases:
- 5
- Voltage - Supply (Vcc/Vdd):
- 3.3V
- Frequency - Switching:
- 200kHz ~ 1.2MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- I2C, PMBus, SMBus
- Control Features:
- Enable, Power Good
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-VQFN-40-902
CHL8325A-03CRT FAQ
1.How can I place an order for CHL8325A-03CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8325A-03CRT 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 CHL8325A-03CRT reliable?
The price and inventory of CHL8325A-03CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8325A-03CRT is usually 5 days.
3.What payment methods are accepted for CHL8325A-03CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8325A-03CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8325A-03CRT?
CHL8325A-03CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8325A-03CRT 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 CHL8325A-03CRT?
For technical support, including CHL8325A-03CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8325A-03CRT requirements.
6.How does Aetrix verify that CHL8325A-03CRT is sourced from the original manufacturer or authorized distributors?
All CHL8325A-03CRT 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 CHL8325A-03CRT meets industry standards.
7.What is the process for return or replacement of CHL8325A-03CRT?
All CHL8325A-03CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8325A-03CRT, 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 CHL8325A-03CRT part is unused and in its original packaging.
Return procedure for CHL8325A-03CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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