My Inquiry
My Account
Infineon Technologies CHL8325A-39CRT
- Part No.:
- CHL8325A-39CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
CHL8325A-39CRT.pdf
- Description:
- IC REG BUCK 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,127
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CHL8325A-39CRT 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 high-performance CPU voltage regulation in desktop and server platforms.
For engineers reviewing the CHL8325A-39CRT datasheet, CHL8325A-39CRT pinout, CHL8325A-39CRT application, or CHL8325A-39CRT equivalent, key selection criteria include VR12/SVI compliance, per-loop telemetry via PMBus, NVM-based configuration storage, variable gate drive support, and active diode emulation for ultra-light-load efficiency.
Technical Context
The CHL8325A implements two independent control loops with real-time current sensing on up to five phases, enabling dynamic phase shedding and adaptive transient response using proprietary non-linear digital PWM algorithms. It supports both Intel VR12 (MPoL) and AMD SVI2/400kHz/3.4MHz modes with mode-selectable pin definitions.
Its integrated AFE includes five current-sense inputs (ISEN1–ISEN5), dual voltage sense (VSEN/VSEN_L2), dual temperature sensing (TSEN/TSEN2 only on CHL8325B), and SMBus/PMBus interface with configurable address via VAR_GATE_PM_ADDR pin. The device uses +3.3V supply and operates from –20°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Architecture | Dual-loop digital multi-phase buck controller with 5-phase total capacity |
| Switching Frequency Range | 200kHz to 1.2MHz per phase - enables optimization of efficiency vs. size trade-off |
| Protocol Support | Intel VR12, AMD SVI2, 400kHz & 3.4MHz memory modes - ensures compatibility with modern CPU/GPU VRD designs |
| Telemetry Interface | I²C/SMBus/PMBus - provides real-time readback of voltage, current, temperature, and power per loop |
| Non-Volatile Memory | On-chip NVM - stores custom configurations without external EEPROM, reducing BOM count |
| Light-Load Operation | Programmable 1-/2-phase mode + active diode emulation - maintains high efficiency below 5% load |
| Thermal Range | –20°C to +85°C ambient - validated for commercial desktop and entry-server thermal envelopes |
Pinout & Package
CHL8325A-39CRT is housed in a Pb-free, RoHS-compliant 6×6 mm, 40-pin QFN package (MSL2), with exposed thermal pad for enhanced heat dissipation in high-current VR applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM1–PWM5 | Phase gate drive outputs | Drive external high-side MOSFETs; timing synchronized across all phases |
| ISEN1–ISEN5 | Current sense inputs | Accept differential signals from DCR or shunt-based current sensing networks |
| VSEN / VSEN_L2 | Output voltage sense inputs | High-impedance feedback nodes for precise dual-loop regulation |
| SMB_CLK / SMB_DIO | PMBus interface clock/data | Enable bidirectional telemetry and configuration over standard system management bus |
| VAR_GATE_PM_ADDR | Gate drive voltage select / PMBus address config | Configures variable gate drive level (CHL8325A) or sets PMBus slave address |
| SMB_ALERT# | System alert output | Open-drain fault indicator for server platform monitoring and logging |
| VR_READY_L11 / VR_READY_L21 | Power-good status outputs | Asserted when respective loop output meets regulation tolerance and sequencing requirements |
Key Features
| Feature | Design Value |
|---|---|
| IR Adaptive Transient Algorithm (ATA) | Reduces required bulk capacitance by >30% vs. conventional digital controllers through predictive non-linear PWM response |
| Dynamic Phase Control | Automatically adds/drops active phases based on real-time load current, improving light-load efficiency |
| Variable Gate Drive | Adjusts high-side MOSFET gate voltage (1.5V–5.0V) dynamically to minimize switching losses across load range |
| Dual-Loop Fault Protection | Independent OVP/UVP/OCP/OTP/CFP per loop ensures robust operation during asymmetric load transients |
| Auto-Phase Detection | Identifies connected phases at startup and compensates for layout-induced timing skew without manual calibration |
Applications
| Desktop CPU VR | Server CPU VR |
|---|---|
Use Scenario: High-end gaming and overclocked desktop platforms requiring stable, low-noise core voltage under rapid load steps. IC Role / Device Role / Timing Role: Dual-loop digital buck controller managing up to 5 phases for Vcore and Vio, with VR12 compliance and Vmax overclocking support. Use Value: ATA algorithm reduces output capacitor count by ≥30%, lowering board area and cost while maintaining <±1% regulation during 10–90% load steps. | Use Scenario: 1U/2U rack-mount servers with dual-socket CPUs and strict thermal/power envelope constraints. IC Role / Device Role / Timing Role: Primary VR controller delivering telemetry-enabled, fault-isolated regulation for two independent CPU domains via PMBus. Use Value: SMB_ALERT# and per-loop VR_HOT# signaling enable platform-level thermal throttling coordination and predictive maintenance. |
| DDR Memory Vtt Tracking | Gaming Platform Power Management |
Use Scenario: DDR4/DDR5 memory subsystems requiring precise Vtt tracking relative to Vddq for signal integrity. IC Role / Device Role / Timing Role: Secondary loop configured as Vtt tracker with synchronous sampling and fast-response compensation. Use Value: Tight Vtt-to-Vddq tracking (<±5mV error) minimizes termination noise and improves memory margin at 3200MT/s+ data rates. | Use Scenario: Enthusiast motherboards with user-controllable overclocking profiles and real-time power monitoring. IC Role / Device Role / Timing Role: Configurable VR controller supporting Vmax setting, dynamic phase control, and PMBus-readback of per-loop current/power. Use Value: NVM-stored profiles allow instant switching between silent, balanced, and performance modes without BIOS reflash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-loop 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 firmware is required |
| CHL8325B-00CRTY | Adds second temperature sensor (TSEN2) and VR12 Desktop-specific OTP logic; lacks VAR_GATE_PM_ADDR | Optimized for VR12 desktop thermal management; not compatible in server SMBus-address-configurable systems | Choose for VR12 desktop platforms requiring dual-temperature monitoring and simplified address setup |
Compared with IR3541MTRPBF, CHL8325A-39CRT offers identical control capability but with pre-programmed customer configuration (39 = specific VID mapping and phase assignment); versus CHL8325B, it retains variable gate drive and PMBus address flexibility at the expense of secondary thermal sensing.
Availability
CHL8325A-39CRT is available at Aetrix Electronics and suitable for desktop CPU VR, server power delivery, DDR memory Vtt tracking, and overclocked gaming platforms requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CHL8325A-39CRT 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 high-efficiency DC-DC conversion and digital power architecture.
The CHL8325A belongs to Infineon's IR Digital Power Controller family, designed specifically for high-density, telemetry-rich CPU and memory voltage regulation in next-generation computing platforms.
FAQ
What is the function of the VAR_GATE_PM_ADDR pin on CHL8325A-39CRT?
The VAR_GATE_PM_ADDR pin serves a dual function: when pulled high or low, it selects the gate drive voltage level (1.5V/3.3V/5.0V) for optimized MOSFET switching loss; when used with pull-up/down resistors, it also sets the PMBus slave address, enabling multiple controllers on the same bus without address conflict.
Does CHL8325A-39CRT support both Intel and AMD CPU power delivery standards?
Yes - CHL8325A-39CRT natively supports Intel VR12 (MPoL) and AMD SVI2 protocols across both control loops, including 400kHz and 3.4MHz memory modes. Pin definitions auto-adapt based on SV_DIO1/SV_CLK1 signaling, and VID decoding is fully compliant with specification-defined tables.
How does the IR Adaptive Transient Algorithm (ATA) improve system design?
ATA uses real-time load-step prediction and non-linear digital PWM to reduce output voltage deviation during rapid transients. This allows designers to cut bulk capacitor count by ≥30% while maintaining <±1% regulation, directly lowering PCB area, cost, and ESR-related losses in high-performance VR applications.
Can CHL8325A-39CRT operate with only one active phase?
Yes - the device supports programmable 1-phase or 2-phase operation under light loads, and can enter active diode emulation mode automatically or via command. This mode disables synchronous rectification and replaces it with controlled high-side FET conduction to maintain efficiency below 5% load without reverse-current issues.
CHL8325A-39CRT 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-39CRT FAQ
1.How can I place an order for CHL8325A-39CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8325A-39CRT 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-39CRT reliable?
The price and inventory of CHL8325A-39CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8325A-39CRT is usually 5 days.
3.What payment methods are accepted for CHL8325A-39CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8325A-39CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8325A-39CRT?
CHL8325A-39CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8325A-39CRT 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-39CRT?
For technical support, including CHL8325A-39CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8325A-39CRT requirements.
6.How does Aetrix verify that CHL8325A-39CRT is sourced from the original manufacturer or authorized distributors?
All CHL8325A-39CRT 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-39CRT meets industry standards.
7.What is the process for return or replacement of CHL8325A-39CRT?
All CHL8325A-39CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8325A-39CRT, 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-39CRT part is unused and in its original packaging.
Return procedure for CHL8325A-39CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CHL8325A-39CRT Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
