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Infineon Technologies CHL8325A-19CRT
- Part No.:
- CHL8325A-19CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
CHL8325A-19CRT.pdf
- Description:
- IC REG BUCK 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
CHL8325A-19CRT 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 server platforms.
For engineers reviewing the CHL8325A-19CRT datasheet, CHL8325A-19CRT pinout, CHL8325A-19CRT application, or CHL8325A-19CRT equivalent, key selection criteria include VR12/SVI compliance, per-loop telemetry via PMBus, NVM-based configuration storage, Variable Gate Drive support, and 40-pin 6×6 QFN package thermal performance under +3.3V supply and −20°C to +85°C ambient operation.
Technical Context
The CHL8325A implements two independent control loops with real-time current sensing on up to five phases, enabling dynamic phase shedding and active diode emulation for light-load efficiency. Its IR Efficiency Shaping Technology includes Variable Gate Drive (adjusting gate voltage based on load current) and Dynamic Phase Control (adding/dropping phases).
It supports both Intel VR12 and AMD SVI memory modes (400kHz/3.4MHz), delivers Vtt tracking for DDR memory, and integrates SMBus/PMBus/I²C telemetry for voltage, current, temperature, and power on both loops - all configurable via IR Intuitive Power Designer GUI and stored in on-chip non-volatile memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Architecture | Dual-loop digital PWM with per-phase current sensing and adaptive transient response |
| Phase Count | Up to 5 total phases, flexibly assignable between Loop 1 and Loop 2 |
| Switching Frequency | 200 kHz to 1.2 MHz per phase; enables optimized EMI and efficiency trade-offs |
| Interface Protocol | PMBus v1.2 compliant; supports telemetry read/write and fault logging for both loops |
| Operating Temp | −20°C to +85°C ambient; validated for commercial desktop and workstation VRD applications |
| Supply Voltage | +3.3V only; eliminates need for auxiliary bias rails in VRM designs |
| Package | 6 mm × 6 mm, 40-pin QFN, MSL2; supports high-density PCB layout and thermal pad grounding |
Pinout & Package
CHL8325A-19CRT is housed in a 6×6 mm, 40-pin QFN package with exposed thermal pad. Pin functions are mode-dependent (Intel/MPoL vs. AMD), with dedicated pins for PWM outputs, current sense inputs (ISEN1–ISEN5), voltage sense (VSEN/VRTN), SMBus interface (SMB_CLK/SMB_DIO/SMB_ALERT#), and configuration (VAR_GATE_PM_ADDR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM1–PWM5 | Phase gate drive outputs | Drive external high-side MOSFETs; support interleaved timing and phase shedding |
| ISEN1–ISEN5 | Per-phase current sense inputs | Enable real-time current monitoring and OCP triggering per phase |
| VSEN / VRTN | Main output voltage sense pair | Differential sensing for Loop 1 feedback; rejects noise and trace IR drop |
| SMB_CLK / SMB_DIO | PMBus serial interface | Supports up to 16-device daisy-chain for system-level VR telemetry and configuration |
| VAR_GATE_PM_ADDR | Configuration select input | Enables variable gate drive mode or sets PMBus address; pulled high/low for factory config |
Key Features
| Feature | Design Value |
|---|---|
| IR Adaptive Transient Algorithm (ATA) | Reduces required bulk capacitance by >30% via non-linear digital PWM response to load steps |
| Dynamic Phase Control | Automatically scales active phase count from 1 to 5 based on real-time load current |
| Active Diode Emulation | Replaces synchronous rectifier body diode conduction at ultra-light loads to reduce reverse recovery loss |
| Non-Volatile Memory (NVM) | Stores full configuration (VID tables, OCP thresholds, telemetry settings) without external EEPROM |
| Dual-Loop Fault Protection | Independent OVP/UVP/OCP/OTP/CFP per loop ensures robustness in multi-rail CPU+memory VR systems |
Applications
| Intel VR12 Desktop Platforms | AMD SVI Gaming Systems |
|---|---|
Use Scenario: High-end desktop motherboard delivering precise core voltage to Intel Core i7/i9 processors with dynamic VID scaling. IC Role / Device Role / Timing Role: Primary VR controller managing up to 5 phases across CPU core and GT rails with VR_READY_L11 signaling. Use Value: ATA minimizes bulk capacitor count while maintaining <10 mV transient droop under 50 A/µs load steps. | Use Scenario: Overclocked gaming platform requiring stable VDDIO and VDDQ for DDR4 memory with Vtt tracking. IC Role / Device Role / Timing Role: Dual-loop controller providing independent regulation for CPU core and memory I/O rails with SVI2 protocol handshake. Use Value: Per-loop PMBus telemetry enables real-time thermal throttling coordination between CPU and memory subsystems. |
| Server VRM Modules | Workstation DDR Memory Subsystems |
Use Scenario: 1U rack server motherboard needing fault-tolerant, hot-pluggable VR with SMB_ALERT# reporting. IC Role / Device Role / Timing Role: VR controller with SMBus alert pin and VR_HOT#1 for server BMC integration and thermal event escalation. Use Value: Dual OCP and CFP detection prevents catastrophic failure during sustained overcurrent events in 24/7 operation. | Use Scenario: Precision workstation supporting ECC DDR4 with tight Vtt regulation tolerance (±15 mV). IC Role / Device Role / Timing Role: Secondary loop configured for Vtt tracking with matched sensing and closed-loop compensation. Use Value: Integrated Vtt tracking eliminates need for discrete op-amp circuitry and reduces BOM cost by 3 components. |
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, identical pinout and feature set; differs only in default NVM configuration and part marking | No functional difference; used interchangeably where customer config matches factory defaults | Select when standard VR12 reference configuration suffices without custom DPDC tuning |
| CHL8325B-00CRTY | Adds second temperature sensor (TSEN2) and supports VR12 Desktop 2nd temp monitoring; lacks VAR_GATE_PM_ADDR | Required for VR12 Desktop compliance with dual-die CPU thermal reporting; not suitable for gate-drive optimization use cases | Select for Intel desktop platforms requiring Tj2 reporting; avoid if Variable Gate Drive is needed |
Compared with IR3541MTRPBF, CHL8325A-19CRT offers identical functionality but with customer-specific NVM configuration pre-loaded; versus CHL8325B-00CRTY, it retains VAR_GATE_PM_ADDR for gate-drive optimization but omits the secondary thermal sensor needed for VR12 Desktop certification.
Availability
CHL8325A-19CRT is available at Aetrix Electronics and suitable for Intel VR12 desktop motherboards, AMD SVI gaming platforms, and server VRM modules requiring stable component supply, long-term lifecycle support, and verified PMBus telemetry interoperability.
Supply support for CHL8325A-19CRT 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 VR controller innovation.
The CHL8325A belongs to Infineon's IR Digital Power Controller product line, designed specifically for high-efficiency, multi-phase CPU and memory voltage regulation in performance-critical computing platforms.
FAQ
What is the function of the VAR_GATE_PM_ADDR pin on CHL8325A-19CRT?
The VAR_GATE_PM_ADDR pin selects between Variable Gate Drive mode (when pulled low) and PMBus address configuration mode (when pulled high). In Variable Gate Drive mode, the controller dynamically adjusts high-side MOSFET gate voltage from 5V to 12V based on real-time load current, optimizing switching losses across the full load range.
Does CHL8325A-19CRT support both Intel VR12 and AMD SVI2 protocols simultaneously?
Yes - CHL8325A-19CRT supports both protocols concurrently on separate loops: Loop 1 can be configured for Intel VR12 (with VR_READY_L11 signaling), while Loop 2 operates in AMD SVI2 mode (using SV_DIO1/SV_CLK1), enabling dual-processor or CPU+GPU VR architectures without external protocol translation.
Can CHL8325A-19CRT operate with only one active phase?
Yes - the device supports programmable 1-phase or 2-phase operation at light loads via Dynamic Phase Control. It also enters Active Diode Emulation mode automatically below ~2 A load, replacing synchronous rectification with controlled high-side FET turn-on to eliminate body diode conduction loss.
Is non-volatile memory (NVM) reprogrammable in-system?
Yes - CHL8325A-19CRT's on-chip NVM is fully reprogrammable via PMBus commands using the IR Intuitive Power Designer GUI. Configuration changes (e.g., OCP thresholds, VID tables, telemetry enable bits) persist across power cycles and do not require external programming hardware.
CHL8325A-19CRT 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-19CRT FAQ
1.How can I place an order for CHL8325A-19CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8325A-19CRT 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-19CRT reliable?
The price and inventory of CHL8325A-19CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8325A-19CRT is usually 5 days.
3.What payment methods are accepted for CHL8325A-19CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8325A-19CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8325A-19CRT?
CHL8325A-19CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8325A-19CRT 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-19CRT?
For technical support, including CHL8325A-19CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8325A-19CRT requirements.
6.How does Aetrix verify that CHL8325A-19CRT is sourced from the original manufacturer or authorized distributors?
All CHL8325A-19CRT 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-19CRT meets industry standards.
7.What is the process for return or replacement of CHL8325A-19CRT?
All CHL8325A-19CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8325A-19CRT, 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-19CRT part is unused and in its original packaging.
Return procedure for CHL8325A-19CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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