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Infineon Technologies CHL8326-19CRT
- Part No.:
- CHL8326-19CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
CHL8326-19CRT.pdf
- Description:
- IC REG BUCK 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
CHL8326-19CRT from Infineon Technologies is a dual-loop digital multi-phase buck controller supporting up to 6 phases per loop, compliant with Intel® VR12 and AMD® SVI/PVI specifications, operating from 200kHz to 1.2MHz switching frequency, featuring IR Adaptive Transient Algorithm (ATA), I²C/SMBus/PMBus telemetry, and +3.3V supply for CPU core and memory VR applications.
For engineers reviewing the CHL8326-19CRT datasheet, CHL8326-19CRT pinout, CHL8326-19CRT application, or CHL8326-19CRT equivalent, key selection criteria include dual-loop phase assignment flexibility, per-loop OVP/UVP/OCP/OTP/CFP fault protection, NVM-based custom configuration, active diode emulation at light load, and VR_HOT#/PWROK# signaling for system power sequencing.
Technical Context
The CHL8326-19CRT implements two independent digital PWM control loops with programmable phase allocation (up to 6 total phases), each supporting Intel VR12 and AMD SVI/PVI protocols via dedicated VID/SV interface pins. It integrates dual ADCs for voltage, current, and temperature sensing per loop, with real-time telemetry over PMBus v1.2.
Its IR Efficiency Shaping Technology includes Variable Gate Drive (adjusting MOSFET gate voltage based on load current) and Dynamic Phase Control (automatic phase add/drop), while the proprietary Adaptive Transient Algorithm (ATA) reduces output capacitance requirements by optimizing non-linear digital PWM response during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Phases | 6 total phases, flexibly assignable between Loop 1 and Loop 2 for asymmetric load distribution. |
| Switching Frequency | 200 kHz to 1.2 MHz per phase - enables optimization of efficiency vs. size trade-off in high-current VR designs. |
| Interface Protocol | I²C/SMBus/PMBus v1.2 - supports telemetry readback of voltage, current, temperature, and power for both loops. |
| Fault Protection | Per-loop OVP, UVP, OCP, OTP, CFP - ensures independent safety monitoring and shutdown for each VR rail. |
| Operating Temp | –20°C to +85°C ambient - validated for commercial-grade server, desktop, and gaming platform environments. |
| Supply Voltage | +3.3 V ±5% - powers internal logic and LDOs; eliminates need for auxiliary bias rails. |
| Package | 7×7 mm, 48-pin QFN, MSL2 - surface-mount compatible with standard reflow profiles and thermal pad grounding. |
Pinout & Package
CHL8326-19CRT uses a 7×7 mm, 48-pin QFN package with exposed thermal pad (pin 49 = GND). Pin numbering follows top-view counterclockwise layout starting from top-left corner (pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM1–PWM6 | Phase gate drive outputs | Drive external high-side MOSFETs; support interleaved timing and phase shedding. |
| ISEN1–ISEN6 | Current sense inputs | Accept DCR or shunt-based current feedback per phase for accurate load-line regulation. |
| VSEN / VSEN_L2 | Output voltage sense | Differential remote sensing inputs for Loop 1 and Loop 2 to compensate PCB IR drop. |
| VR_READY1 / VR_READY_L21 | Power-good status outputs | Open-drain signals indicating stable regulation on each loop; used for system power sequencing. |
| SMB_CLK / SMB_DIO | PMBus clock/data | Standard bidirectional SMBus interface for configuration, telemetry, and fault logging. |
| VAR_GATE | Variable gate drive control | Enables dynamic adjustment of gate drive voltage to optimize switching loss vs. conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-loop independent control | Enables simultaneous regulation of CPU core (Vcore) and DDR memory (Vtt/Vref) with separate transient response tuning. |
| IR Adaptive Transient Algorithm (ATA) | Reduces required bulk capacitance by >30% versus fixed-gain PID controllers through nonlinear digital PWM correction. |
| Active Diode Emulation | Replaces synchronous rectifier body diode conduction with controlled low-side FET turn-on at ultra-light loads, improving efficiency below 1A. |
| Non-volatile memory (NVM) | Stores custom configuration (VID tables, fault thresholds, phase mapping) eliminating boot-time I²C programming overhead. |
| Auto-phase detection | Identifies connected phases at startup and auto-compensates loop gain and timing without manual calibration. |
Applications
| CPU Core Voltage Regulation | DDR Memory Vtt Tracking |
|---|---|
Use Scenario: Regulating high-current, dynamically scaled CPU core voltage in desktop and enthusiast gaming platforms. IC Role / Device Role / Timing Role: Dual-loop digital buck controller managing up to 6 phases with VR12-compliant VID decoding and adaptive transient response. Use Value: Enables stable sub-1V operation under rapid load steps (e.g., 100A/µs) while minimizing output capacitor count via ATA. | Use Scenario: Providing precision-tracking Vtt supply for DDR3/DDR4 memory subsystems with tight voltage tolerance. IC Role / Device Role / Timing Role: Secondary loop configured for Vtt generation with tracking ratio and offset programmable via PMBus. Use Value: Maintains Vtt = 0.5 × VDDQ ±5 mV across temperature and load, reducing signal integrity margin loss in high-speed memory interfaces. |
| Overclocked Platform Power | Server CPU VRD Compliance |
Use Scenario: Supporting extreme overclocking with user-defined Vmax limits and enhanced thermal throttling in enthusiast motherboards. IC Role / Device Role / Timing Role: Controller enabling Gaming Mode via SV_ALERT#/VID[4]2 pin, with configurable overvoltage ceiling and VR_HOT# critical alert. Use Value: Allows safe, repeatable overclocking headroom extension while preserving silicon reliability via per-loop OTP and CFP protection. | Use Scenario: Meeting Intel VRD12.0 specification for dual-rail server CPUs requiring independent fault reporting and telemetry. IC Role / Device Role / Timing Role: VR controller implementing full VR12 protocol stack, including PWRGD2, PWROK2, and VRHOT_ICRIT# signals. Use Value: Ensures compatibility with server BMCs and platform firmware for coordinated power management and failure diagnostics. |
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 |
|---|---|---|---|
| IR3536MTRPBF | Same die, default factory configuration (no customer NVM programming); identical pinout and electrical specs. | Lacks pre-loaded CHL8326-19CRT-specific VID tables and phase mapping; requires DPDC GUI configuration post-solder. | Select when design flexibility and field reconfiguration outweigh pre-programmed consistency. |
| MP8765GQ-Z | Single-loop 6-phase controller; no native dual-loop or SVI/PVI support; uses analog-assisted digital control instead of full digital PWM. | Requires external circuitry for Vtt tracking; lacks PMBus telemetry for second rail; limited to Intel-only mode. | Select only for cost-sensitive single-rail applications where dual-loop independence is not required. |
Compared with IR3536MTRPBF, CHL8326-19CRT offers guaranteed factory-programmed configuration and faster time-to-power; compared with MP8765GQ-Z, it delivers true dual-rail autonomy, AMD compatibility, and integrated telemetry-critical for high-end client and server VR designs.
Availability
CHL8326-19CRT is available at Aetrix Electronics and suitable for CPU core voltage regulation, DDR memory Vtt tracking, and overclocked platform power delivery requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CHL8326-19CRT 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 solutions.
The CHL8326 belongs to Infineon's IR35xx digital multiphase controller product line, designed specifically for high-efficiency, high-density voltage regulator modules (VRMs) in computing platforms requiring precise multi-rail control and telemetry.
FAQ
What is the function of the VAR_GATE pin on CHL8326-19CRT?
The VAR_GATE pin controls the variable gate drive voltage level applied to external high-side MOSFETs. It dynamically adjusts between 5 V and 12 V based on real-time load current to minimize combined switching and conduction losses, improving efficiency across the full 0–100% load range without external components.
Does CHL8326-19CRT support AMD PVI mode on both loops simultaneously?
Yes. CHL8326-19CRT supports AMD PVI mode independently on Loop 1 and Loop 2 via dedicated SV interface pins (SV_CLK1/SV_DIO1/SV_ALERT1 for Loop 1; RCSP_L2/RCSM_L2 for Loop 2), enabling concurrent regulation of CPU core and memory rails using AMD's proprietary voltage identification protocol.
How is non-volatile memory (NVM) used in CHL8326-19CRT?
The on-chip NVM stores user-defined configurations-including phase assignment maps, fault thresholds, VID tables, ATA coefficients, and SMBus addresses-enabling immediate operation after power-up without host processor initialization, reducing boot time and simplifying system firmware.
Can CHL8326-19CRT operate with only one active phase per loop?
Yes. The controller supports programmable 1-phase or 2-phase operation per loop at light loads, and further enters active diode emulation mode below ~0.5 A, turning off high-side FETs and synchronously controlling low-side FETs to replace body-diode conduction-improving light-load efficiency by up to 8%.
CHL8326-19CRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- PWM
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 6
- Output Phases:
- 6
- 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-48-901
CHL8326-19CRT FAQ
1.How can I place an order for CHL8326-19CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8326-19CRT 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 CHL8326-19CRT reliable?
The price and inventory of CHL8326-19CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8326-19CRT is usually 5 days.
3.What payment methods are accepted for CHL8326-19CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8326-19CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8326-19CRT?
CHL8326-19CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8326-19CRT 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 CHL8326-19CRT?
For technical support, including CHL8326-19CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8326-19CRT requirements.
6.How does Aetrix verify that CHL8326-19CRT is sourced from the original manufacturer or authorized distributors?
All CHL8326-19CRT 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 CHL8326-19CRT meets industry standards.
7.What is the process for return or replacement of CHL8326-19CRT?
All CHL8326-19CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8326-19CRT, 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 CHL8326-19CRT part is unused and in its original packaging.
Return procedure for CHL8326-19CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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