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Infineon Technologies CHL8325A-16CRT
- Part No.:
- CHL8325A-16CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
CHL8325A-16CRT.pdf
- Description:
- IC REG BUCK 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
CHL8325A-16CRT from Infineon Technologies is a dual-loop, 5-phase digital multi-phase buck controller supporting Intel® VR12 and AMD® SVI protocols, with programmable switching frequency (200kHz–1.2MHz), IR Adaptive Transient Algorithm (ATA), and dual-loop OCP for CPU voltage regulation in high-performance desktop and gaming platforms.
For engineers reviewing the CHL8325A-16CRT datasheet, CHL8325A-16CRT pinout, CHL8325A-16CRT application, or CHL8325A-16CRT equivalent, key selection criteria include VR12/SVI protocol compliance, per-loop telemetry via PMBus, NVM-based configuration storage, variable gate drive support, and 6×6 40-pin QFN thermal performance in compact VRMs.
Technical Context
The CHL8325A implements two independent control loops with fully programmable phase assignment (up to 5 total phases), supporting both Intel VR12 and AMD SVI2/400kHz/3.4MHz modes. It integrates dual current-sense ADCs, temperature sensing (TSEN), and SMBus/PMBus v1.2 interface for real-time telemetry of voltage, current, temperature, and power on both loops.
Its IR Efficiency Shaping Technology includes Variable Gate Drive (enabled via VAR_GATE_PM_ADDR pin) and Dynamic Phase Control-automatically scaling active phases from 1 to 5 based on load-and Active Diode Emulation for ultra-light-load efficiency. ATA uses non-linear digital PWM to reduce bulk capacitor count without compromising transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-loop digital multi-phase buck controller with up to 5 total phases |
| Protocol Support | Fully compliant with Intel VR12 and AMD SVI2 (400kHz & 3.4MHz) modes |
| Switching Frequency | 200kHz to 1.2MHz per phase, configurable per loop |
| Interface | I²C/SMBus/PMBus v1.2 with 16-device addressability and register-level telemetry |
| Memory | On-chip non-volatile memory (NVM) for storing custom configurations and fault thresholds |
| Operating Temp | −20°C to +85°C ambient, suitable for commercial desktop and overclocked platform environments |
| Supply Voltage | +3.3V VCC input; integrated LDO generates internal 1.8V rail |
Pinout & Package
CHL8325A-16CRT 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; phase count assignable between Loop 1 and Loop 2 |
| ISEN1–ISEN5 | Current sense inputs | Differential current sense inputs per phase, enabling per-phase current monitoring and OCP |
| VSEN / VSEN_L2 | Output voltage feedback | High-impedance analog inputs for precise remote sensing of Vout1 and Vout2 |
| SMB_CLK / SMB_DIO / SMB_ALERT# | PMBus interface signals | Standard SMBus clock/data/alert lines supporting telemetry read/write and fault alert signaling |
| VAR_GATE_PM_ADDR | Configuration select | Selects between PMBus address mode and Variable Gate Drive control mode (CHL8325A-specific) |
| TSEN | Temperature sensor input | Analog input for external NTC thermistor; enables thermal foldback and OTP protection |
Key Features
| Feature | Design Value |
|---|---|
| IR Adaptive Transient Algorithm (ATA) | Non-linear digital PWM reduces required output bulk capacitance by up to 40% while maintaining <100mV transient deviation |
| Dynamic Phase Control | Automatically scales active phases (1–5) based on real-time load current, improving light-load efficiency by >15% |
| Variable Gate Drive | Adjusts high-side MOSFET gate drive voltage (3.3V–7.5V) dynamically to minimize switching losses across load range |
| Dual-loop OCP & Fault Protection | Independent overcurrent protection per loop with I-spike detection optimized for AMD CPU burst loads |
| Vtt Tracking Function | Generates DDR memory termination voltage (Vtt) referenced to VDDQ/2, supporting DDR3/DDR4 memory subsystems |
Applications
| Intel VR12 Desktop Platforms | AMD SVI2 Gaming Systems |
|---|---|
Use Scenario: High-end desktop motherboards requiring strict VR12 compliance for 4th–6th Gen Intel Core processors. IC Role / Device Role / Timing Role: Primary CPU voltage regulator controller managing up to 5 phases with VID decoding, telemetry, and adaptive transient response. Use Value: Enables single-chip VRM design with NVM-stored configurations, eliminating external EEPROM and reducing BOM count by 3 components. | Use Scenario: Overclocked AMD Ryzen-based gaming PCs demanding fast load-step response and robust thermal management. IC Role / Device Role / Timing Role: Dual-loop controller delivering independent Vcore and SoC rail regulation with I-spike-enhanced OCP and VR_HOT# fault signaling. Use Value: Reduces peak output voltage deviation to <80mV during 20A/µs load steps, minimizing need for expensive ceramic bulk capacitors. |
| DDR Memory Vtt Tracking | Server-Class Power Management |
Use Scenario: DDR4 memory subsystems requiring precise Vtt regulation tied to VDDQ/2 reference. IC Role / Device Role / Timing Role: Secondary loop configured as tracking regulator generating Vtt from main VDDQ rail with <±1% accuracy. Use Value: Eliminates need for discrete op-amp tracking circuit, saving 20mm² PCB area and simplifying layout near memory modules. | Use Scenario: Entry-level server motherboards needing SMBus-alert-driven fault reporting and system-level power sequencing. IC Role / Device Role / Timing Role: PMBus-enabled controller providing VR_READY_L11/PWRGD2 and VR_READY_L21/PWROK2 power-good signals with programmable delay. Use Value: Supports coordinated power-up of CPU, memory, and chipset via standardized SMBus telemetry and alert signaling to BMC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-loop digital multi-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR3541MTRPBF | Same silicon die and feature set; differs only in default NVM configuration and part marking | No functional difference-identical pinout, timing, and protocol behavior | Select when standard factory configuration suffices and no customer-specific NVM programming is required |
| CHL8325B-00CRTY | Adds second temperature sense input (TSEN2) and supports VR12 Desktop 2nd temp monitoring mode | Required for dual-thermal-zone VR designs (e.g., CPU + VRM FET temp monitoring) | Choose only if secondary thermal sensing and VR12 Desktop-specific OTP logic are needed |
Compared with IR3541MTRPBF, CHL8325A-16CRT offers identical core functionality but enables customer-specific NVM configuration via CRT1 suffix; versus CHL8325B, it omits TSEN2-reducing cost and complexity where single-point thermal monitoring suffices.
Availability
CHL8325A-16CRT is available at Aetrix Electronics and suitable for Intel VR12 desktop platforms, AMD SVI2 gaming systems, and DDR4 Vtt tracking applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CHL8325A-16CRT 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, automotive, and industrial control ICs, with deep expertise in digital power conversion and energy-efficient solutions.
The CHL8325A belongs to Infineon's IR Digital Power Controller product line, designed specifically for high-efficiency, software-configurable CPU and memory VRMs in performance desktop, workstation, and entry-server platforms.
FAQ
What is the function of the VAR_GATE_PM_ADDR pin on CHL8325A-16CRT?
The VAR_GATE_PM_ADDR pin selects between two operating modes: when pulled high, it enables Variable Gate Drive (3.3V–7.5V adjustable gate voltage); when pulled low, it configures the device for standard PMBus address selection. This dual-function pin eliminates the need for an external configuration resistor or jumper, simplifying board layout and enabling runtime reconfiguration.
Does CHL8325A-16CRT support DDR5 memory Vpp or Vddq regulation?
No. CHL8325A-16CRT supports DDR3/DDR4 Vtt tracking via its secondary loop but does not provide dedicated Vpp (1.8V) or Vddq (1.1V/1.2V) regulation required for DDR5. Its VSEN_L2 loop is limited to ±1% tracking accuracy and lacks the fast transient response and low-noise filtering specified for DDR5 Vddq rails.
Can CHL8325A-16CRT be used without programming its NVM?
Yes. CHL8325A-16CRT powers up with factory-default NVM settings compliant with Intel VR12 and AMD SVI2 specifications. No programming is required for basic operation; NVM customization is optional and performed using Infineon's Intuitive Power Designer (DPDC) GUI for advanced features like custom OCP thresholds or phase shedding profiles.
How does the IR Adaptive Transient Algorithm (ATA) differ from conventional digital PID control?
ATA uses proprietary non-linear digital PWM algorithms that adjust duty cycle and phase activation in real time based on predicted load change-not just error correction. Unlike linear PID, ATA anticipates transients using current-slope analysis and pre-empts voltage droop before it occurs, achieving <100mV deviation on 20A/µs steps without increasing output capacitance.
CHL8325A-16CRT 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-16CRT FAQ
1.How can I place an order for CHL8325A-16CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8325A-16CRT 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-16CRT reliable?
The price and inventory of CHL8325A-16CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8325A-16CRT is usually 5 days.
3.What payment methods are accepted for CHL8325A-16CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8325A-16CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8325A-16CRT?
CHL8325A-16CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8325A-16CRT 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-16CRT?
For technical support, including CHL8325A-16CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8325A-16CRT requirements.
6.How does Aetrix verify that CHL8325A-16CRT is sourced from the original manufacturer or authorized distributors?
All CHL8325A-16CRT 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-16CRT meets industry standards.
7.What is the process for return or replacement of CHL8325A-16CRT?
All CHL8325A-16CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8325A-16CRT, 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-16CRT part is unused and in its original packaging.
Return procedure for CHL8325A-16CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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