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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Infineon Technologies CHL8318-02CRT

Name: CHL8318-02CRT
Brand: Infineon Technologies
SKU: CHL8318-02CRT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CHL8318-02CRT

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

Package:: 56-VFQFN Exposed Pad

Datasheet:: CHL8318-02CRT.pdf

Description:: IC REG BUCK 56VQFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,054

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Product details

Overview

CHL8318-02CRT from CHiL Semiconductor is an 8-phase digital synchronous buck controller compliant with Intel VR11.1/VR11.0 specifications, designed for CPU core voltage regulation. It supports programmable 1–8-phase operation, 200 kHz–1 MHz switching frequency (±2% accuracy), SMBus-based gamer-mode VID control up to 2.3 V, and adaptive transient response for high-performance desktop/server VRDs.

For engineers reviewing the CHL8318-02CRT datasheet, CHL8318-02CRT pinout, CHL8318-02CRT application, or CHL8318-02CRT equivalent, key selection considerations include VR11.x compliance, digital phase management, thermal phase balancing, coupled-inductor support, and integrated IMON current monitoring without external sense resistors.

Technical Context

The CHL8318-02CRT implements a digital PWM architecture with non-linear adaptive transient control, enabling bulk capacitor reduction via predictive load-step response. Its dual-loop control integrates voltage error PID with real-time current balance across phases using eight independent ISEN inputs and eight PWM outputs.

It features three NTC temperature sensor interfaces (TSEN1–TSEN3), SMBus-configurable fault reporting (OVP/UVP/OCP/OTP), and nine bytes of on-chip NVM for user-defined configuration storage. The controller operates from a +3.3 V supply and supports PSI signaling for light-load efficiency optimization (1–4 active phases).

Key Specifications

Parameter	Value and Actual Design Meaning
Phases	Programmable 1–8-phase synchronous buck control for scalable CPU power delivery
Switching Frequency	200 kHz–1 MHz per phase, ±2% accuracy enables stable loop design and EMI control
VID Resolution	6.25 mV in Gamer Mode, supporting precise CPU voltage tuning up to 2.3 V
IMON Output	Digital current monitor output with lossless, sensorless input current sensing
Temperature Sensing	Three dedicated NTC inputs (TSEN1–TSEN3) for VR_HOT and OTP fault triggering
PSI Support	Configurable 1–4-phase PSI# signal for dynamic phase shedding during light loads
NVM Storage	9 bytes of on-chip non-volatile memory for persistent device configuration

Pinout & Package

CHL8318-02CRT is housed in a 56-pin, 8 mm × 8 mm QFN package with exposed thermal pad (MSL Level 1, RoHS compliant). Pin functions are validated per CHiL Semiconductor PB0006 Rev. 1.00.

Pin/Terminal	Circuit Role	Design Meaning
VINSEN	Input Voltage Sense Input	Monitors 12 V rail for OVP/UVP protection and input current calculation
ISEN1–ISEN8	Phase Current Sense Inputs	Eight differential inputs for per-phase current measurement and balance control
PWM1–PWM8	Gate Drive Outputs	Eight digital PWM outputs driving external high-side MOSFETs or 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	Two-wire bus for configuration, real-time monitoring, and fault reporting
TSEN1–TSEN3	NTC Thermistor Inputs	Analog inputs for thermal monitoring and VR_HOT/OTP fault generation

Key Features

Feature	Design Value
Gamer Mode SMBus Commands	Enables extended VID (2.3 V), Vmax, OC/OVP override, and Track mode without hardware changes
Adaptive Transient Algorithm	Reduces required output bulk capacitance by >30% vs. fixed-gain analog controllers
Dynamic Phase Control	Autonomously adds/drops phases across load range to maintain >90% efficiency from 1% to 100% load
Thermal Phase Balancing	Proportional current redistribution between phases based on real-time die temperature gradients
Coupled Inductor Support	Enables 180° out-of-phase phase pairing for improved transient response and smaller magnetics

Applications

Intel VR11.x CPU VRD

High-Performance Server VRM

Use Scenario: Core voltage regulation for Intel Core i7/i9 processors in LGA1151/LGA2066 platforms.

IC Role / Device Role / Timing Role: Primary digital multi-phase buck controller managing CPU V_core with VR11.1-compliant VID decoding and PSI signaling.

Use Value: Enables accurate dynamic voltage scaling, fast load-step response (<10 µs), and seamless integration with Intel's PMBus-compliant system management.

Use Scenario: Dual-socket Xeon Scalable server motherboards requiring high-current, thermally balanced core regulation.

IC Role / Device Role / Timing Role: 8-phase controller coordinating with CHL8510 drivers to deliver >300 A with <±3% phase current imbalance.

Use Value: Delivers >92% peak efficiency at 50 A/phase and supports thermal derating via TSEN-driven phase shedding.

Gaming Desktop Overclocking Platform

DDR Memory Power Delivery

Use Scenario: Enthusiast gaming motherboard with user-accessible overclocking controls via UEFI or software.

IC Role / Device Role / Timing Role: Digital VR controller executing Gamer Mode commands (Gamer VID, Vmax, Load-Line Adjust) over SMBus.

Use Value: Supports stable 2.3 V V_core at 6.25 mV resolution and real-time OC/OVP threshold adjustment without hardware rework.

Use Scenario: DDR4/DDR5 memory subsystem requiring tightly regulated VDDQ and VPP rails.

IC Role / Device Role / Timing Role: Secondary VR controller configured for 2–4 phase operation to regulate memory I/O voltage with PSI-enabled light-load efficiency.

Use Value: Achieves <10 mV load regulation and <5 µs transient recovery while reducing standby power by 40% via PSI-driven phase collapse.

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
ISL6367IRZ-T	7-phase, VR12.5-compliant; lacks Gamer Mode, no TSEN inputs, only 2 NTC channels	Targeted at post-VR11 platforms with tighter voltage tolerance (±0.5%) but no overclocking feature set	Prefer for VR12.5 systems requiring tighter VID accuracy; not suitable for VR11.x Gamer Mode use cases
RT8803AZSP	8-phase, VR11.1-compliant; no NVM storage, no VAR_GATE, fixed 300–600 kHz f_SW	Cost-optimized VRD for mainstream desktops; lacks adaptive transient algorithm and thermal balancing	Select when NVM persistence and dynamic phase balancing are non-critical; lower BOM cost but reduced light-load efficiency

Compared with ISL6367IRZ-T and RT8803AZSP, CHL8318-02CRT uniquely combines VR11.x compliance, Gamer Mode SMBus extensibility, on-chip NVM, and thermal-aware phase balancing-making it the only option supporting both enterprise server reliability and enthusiast overclocking flexibility in a single controller.

Availability

CHL8318-02CRT is available at Aetrix Electronics and suitable for Intel VR11.x CPU VRD designs, high-performance server VRMs, and gaming-platform overclocking systems requiring stable component supply, long-term lifecycle assurance, and full technical documentation support.

Supply support for CHL8318-02CRT 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 Corp. is a fabless power management IC designer headquartered in Tewksbury, MA, specializing in digitally controlled multi-phase buck controllers for high-performance computing.

The CHL8318 product line was developed specifically to address Intel VR11.x platform requirements-including PSI signaling, IMON accuracy, and digital overclocking-while enabling simplified, "set-and-forget" VRD implementation with minimal external components.

FAQ

What is the operating temperature range for CHL8318-02CRT?

The CHL8318-02CRT is rated for commercial ambient operation from 0 °C to +85 °C. Its thermal protection relies on three external NTC sensors (TSEN1–TSEN3) connected to the controller, with VR_HOT and OTP faults triggered based on configurable thresholds stored in on-chip NVM.

Does CHL8318-02CRT require external gate drivers?

Yes, CHL8318-02CRT requires external gate drivers such as the CHL8510. It provides eight digital PWM outputs (PWM1–PWM8) but does not integrate high- or low-side driver stages. The VAR_GATE pin allows dynamic adjustment of gate drive strength based on load current to optimize efficiency.

How is current sensing implemented without shunt resistors?

CHL8318-02CRT uses lossless, sensorless input current monitoring (IMON) derived from VINSEN and PWM duty cycle analysis, combined with eight differential ISEN inputs for per-phase current sensing. No external shunt resistors are needed for primary current measurement or phase balancing.

Can CHL8318-02CRT be used with non-coupled inductors?

Yes, CHL8318-02CRT supports both coupled and non-coupled inductor topologies. Coupled inductor mode enables enhanced transient response and phase-pairing (180° out-of-phase), but standard discrete inductors are fully supported with default phase interleaving and full 1–8 phase scalability.

CHL8318-02CRT 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

CHL8318-02CRT FAQ

1.How can I place an order for CHL8318-02CRT through Aetrix?

Please submit a Request for Quotation (RFQ) for CHL8318-02CRT 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 CHL8318-02CRT reliable?

The price and inventory of CHL8318-02CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CHL8318-02CRT is usually 5 days.

3.What payment methods are accepted for CHL8318-02CRT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CHL8318-02CRT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CHL8318-02CRT?

CHL8318-02CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CHL8318-02CRT 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 CHL8318-02CRT?

For technical support, including CHL8318-02CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CHL8318-02CRT requirements.

6.How does Aetrix verify that CHL8318-02CRT is sourced from the original manufacturer or authorized distributors?

All CHL8318-02CRT 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 CHL8318-02CRT meets industry standards.

7.What is the process for return or replacement of CHL8318-02CRT?

All CHL8318-02CRT units undergo pre-shipment inspection (PSI). If there is an issue with CHL8318-02CRT, 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 CHL8318-02CRT part is unused and in its original packaging.

Return procedure for CHL8318-02CRT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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