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Infineon Technologies CHL8318-03CRT
- Part No.:
- CHL8318-03CRT
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
CHL8318-03CRT.pdf
- Description:
- IC REG BUCK 56VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,654
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Product details
Overview
CHL8318-03CRT from CHiL Semiconductor is an 8-phase digital synchronous buck controller compliant with Intel VR11.0/VR11.1 specifications, designed for CPU core voltage regulation. It supports programmable 1–8-phase operation, 200 kHz–1 MHz per-phase switching frequency (±2% accuracy), SMBus-based Gamer Mode with VID up to 2.3 V, and adaptive transient response for high-performance desktop/server VRDs.
For engineers reviewing the CHL8318-03CRT datasheet, CHL8318-03CRT pinout, CHL8318-03CRT application, or CHL8318-03CRT equivalent, key selection criteria include VR11.x compliance, digital phase control logic, PSI signaling for light-load efficiency, thermal phase balancing, and integrated IMON current monitoring without external sense resistors.
Technical Context
The CHL8318-03CRT implements a non-linear digital PWM architecture with adaptive transient algorithm to reduce bulk capacitance requirements. Its digital processor handles real-time current balancing across up to eight phases using ISENx/IRTNx differential current sensing inputs and supports coupled inductor operation with 180° phase interleaving.
It integrates a 3.3 V LDO, nine-byte NVM for configuration storage, SMBus fault reporting (OVP/UVP/OCP/OTP), and three independent NTC temperature sensor interfaces (TSEN1–TSEN3) enabling VR_HOT and OTP protection with digital thermal phase balancing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phases | Programmable 1–8-phase synchronous buck operation for scalable CPU power delivery |
| Switching Frequency | 200 kHz–1 MHz per phase, ±2% accuracy enables stable loop design and EMI control |
| VR Compliance | Fully compliant with Intel VR11.0 and VR11.1, including PSI# signaling and IMON reporting |
| Gamer VID Range | Up to 2.3 V with 6.25 mV resolution via SMBus for overclocking applications |
| Temperature Sensing | Three NTC inputs (TSEN1–TSEN3) support VR_HOT alert and digital thermal phase balancing |
| Supply Voltage | +3.3 V nominal; operates from 0 °C to +85 °C ambient for commercial server/desktop use |
| NVM Storage | Nine bytes of on-chip non-volatile memory store configuration for "set-and-forget" deployment |
Pinout & Package
CHL8318-03CRT is housed in an 8 mm × 8 mm, 56-pin QFN package with exposed thermal pad (MSL Level 1, RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINSEN | Input voltage sense input | High-impedance monitor for input rail voltage; enables accurate OVP/UVP detection |
| ISEN1–ISEN8 | Phase current sense inputs | Differential inputs paired with IRTNx for lossless per-phase current measurement |
| IRTN1–IRTN8 | Current sense return terminals | Low-side reference for ISENx; supports Kelvin connection to minimize PCB layout error |
| PWM1–PWM8 | Gate drive outputs | Eight independent digital PWM outputs driving external MOSFET drivers (e.g., CHL8510) |
| VID0–VID7 | CPU VID bus inputs | 8-bit parallel interface for VR11.x voltage identification decoding |
| SCL/SDA/SALERT# | SMBus interface pins | 3-wire SMBus 2.0 interface for configuration, real-time monitoring, and fault reporting |
| TSEN1–TSEN3 | NTC temperature sensor inputs | Supports three external thermistors for localized VR temperature monitoring and thermal throttling |
| PSI# | Power Status Indicator output | Open-drain signal indicating active phase count reduction for light-load efficiency mode |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Transient Algorithm | Non-linear digital PWM reduces required output bulk capacitance by >30% vs. fixed-frequency controllers |
| Dynamic Phase Control | Autonomous phase add/drop across load range maintains >90% efficiency from 1% to 100% load |
| Variable Gate Drive (VAR_GATE) | Adjusts driver strength per phase based on load current to optimize switching losses |
| Digital Thermal Phase Balancing | Proportional current redistribution between phases based on TSEN1–TSEN3 readings prevents hot-spotting |
| Gamer Mode via SMBus | Enables extended VID (2.3 V), digital load-line adjust, and Gamer OC/OVP without hardware changes |
Applications
| Intel VR11.x CPU VRD | High-Performance Desktop VRM |
|---|---|
Use Scenario: Core voltage regulation for Intel Core i7/i9 processors supporting VR11.1 protocol. IC Role / Device Role / Timing Role: Primary digital multi-phase buck controller managing VID decode, phase sequencing, and IMON reporting. Use Value: Enables precise 6.25 mV VID steps, PSI#-driven phase shedding, and SMBus-configurable load line for dynamic performance tuning. | Use Scenario: High-efficiency VRM on enthusiast desktop motherboards with overclocking capability. IC Role / Device Role / Timing Role: Central controller coordinating up to eight CHL8510 gate drivers and coupled inductors. Use Value: Delivers >90% efficiency across full load range via dynamic phase control and variable gate drive optimization. |
| Server CPU Power Delivery | Gaming Platform Overclocking System |
Use Scenario: Dual-socket server motherboard requiring robust thermal management and fault logging. IC Role / Device Role / Timing Role: Multi-phase controller with three NTC inputs and SMBus fault indicators (OVP/UVP/OCP/OTP). Use Value: Supports digital thermal phase balancing and VR_HOT alerts to maintain safe junction temperatures under sustained load. | Use Scenario: Gaming PC platform where users enable "Gamer Mode" via BIOS or utility software. IC Role / Device Role / Timing Role: Digital controller executing SMBus Gamer commands including VID override, track, and OC/OVP thresholds. Use Value: Allows real-time voltage scaling up to 2.3 V with no external components-enabling stable overclocks without hardware mods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase digital buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6367CRZ-T | 7-phase max, VR12.0/IMVP7 compliant; lacks Gamer Mode features and VAR_GATE | Targeted at newer Intel platforms; no native VR11.x PSI# or extended VID support | Select if upgrading to IMVP7/VR12.0 systems; not drop-in for VR11.x designs |
| MP8765GL-Z | 6-phase, analog-digital hybrid; no SMBus configurability, no NVM, no TSEN inputs | Cost-optimized for mid-tier desktops; no thermal phase balancing or gamer-specific functions | Choose for simpler, lower-cost VRMs without advanced telemetry or overclocking features |
Compared with ISL6367CRZ-T and MP8765GL-Z, the CHL8318-03CRT uniquely delivers VR11.x-native PSI#, 8-phase scalability, integrated Gamer Mode, and digital thermal balancing-making it optimal for legacy high-end desktop and overclocking-focused VRD implementations.
Availability
CHL8318-03CRT is available at Aetrix Electronics and suitable for Intel VR11.x CPU VRD design, high-performance desktop VRM development, and gaming platform overclocking systems requiring stable component supply and long-term lifecycle support.
Supply support for CHL8318-03CRT 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
CHiL Semiconductor was a fabless power management IC designer acquired by Intersil (now Renesas) in 2014; its digital multiphase controllers were widely adopted in high-end computing VRDs before integration into Renesas' ISL/RAA product lines.
The CHL8318 belongs to CHiL's VR11.x-optimized digital controller family, engineered specifically for low-latency adaptive transient response, SMBus-based system-level control, and thermal-aware multi-phase current balancing in CPU power delivery.
FAQ
What is the maximum number of phases supported by CHL8318-03CRT?
The CHL8318-03CRT supports up to eight synchronous buck phases, configurable via SMBus or hardware strapping. It enables full 8-phase operation for peak CPU current demands and dynamically scales down to 1–4 phases during light loads using PSI# signaling to maintain high efficiency across the entire load range.
Does CHL8318-03CRT require external current sense resistors?
No. The CHL8318-03CRT uses differential ISENx/IRTNx inputs for lossless, sensorless current sensing per phase-eliminating the need for external shunt resistors. This reduces power loss, PCB area, and thermal stress while maintaining high accuracy for IMON reporting and current balancing.
Can CHL8318-03CRT be used with non-CHiL gate drivers?
Yes. While optimized for CHiL's ATL and tri-state drivers (e.g., CHL8510), the CHL8318-03CRT's PWM1–PWM8 outputs are compatible with standard 3.3 V logic-level gate drivers. Designers must verify timing margins, drive strength, and dead-time settings when substituting third-party drivers.
How is configuration stored and retained on CHL8318-03CRT?
Configuration parameters-including phase count, switching frequency, load line, fault thresholds, and Gamer Mode settings-are stored in nine bytes of on-chip non-volatile memory (NVM). These values persist across power cycles and are programmed once via SMBus using CHiL's Intuitive Power Designer (IPD) GUI tool.
CHL8318-03CRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- PWM
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 8
- Voltage - Supply (Vcc/Vdd):
- 3.3V
- Frequency - Switching:
- 200kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- SMBus
- Control Features:
- Enable
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-VQFN-56-901
CHL8318-03CRT FAQ
1.How can I place an order for CHL8318-03CRT through Aetrix?
Please submit a Request for Quotation (RFQ) for CHL8318-03CRT 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 CHL8318-03CRT reliable?
The price and inventory of CHL8318-03CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8318-03CRT is usually 5 days.
3.What payment methods are accepted for CHL8318-03CRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8318-03CRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CHL8318-03CRT?
CHL8318-03CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CHL8318-03CRT 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 CHL8318-03CRT?
For technical support, including CHL8318-03CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8318-03CRT requirements.
6.How does Aetrix verify that CHL8318-03CRT is sourced from the original manufacturer or authorized distributors?
All CHL8318-03CRT 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 CHL8318-03CRT meets industry standards.
7.What is the process for return or replacement of CHL8318-03CRT?
All CHL8318-03CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8318-03CRT, 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 CHL8318-03CRT part is unused and in its original packaging.
Return procedure for CHL8318-03CRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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