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STMicroelectronics L6716
- Part No.:
- L6716
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN
- Datasheet:
-
L6716.pdf
- Description:
- IC REG CTRL VR11.1 3OUT 48VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
L6716 from STMicroelectronics is a 2/3/4-phase VR11.1-compliant voltage regulator controller with three integrated high-current gate drivers, differential remote sensing, full inductor current sensing, and Load Transient Boost (LTB) Technology™. It delivers ±0.5% output voltage accuracy across line and temperature, supports up to 1.60000 V via 8-bit VID programming, and enables high-density CPU power delivery for desktop/server/workstation platforms.
For engineers reviewing the L6716 datasheet, L6716 pinout, L6716 application, or L6716 equivalent, this device is selected for Intel VR11.1-compliant multi-phase buck regulation where fast load transient response, programmable OVP/OCP, differential voltage positioning, and pre-biased soft-start are required.
Technical Context
The L6716 implements an adaptive multi-phase PWM control architecture with independent channel current sensing (CS1±–CS4±), droop-based voltage positioning, and digital VID decoding for dynamic voltage identification. Its internal oscillator sets per-phase switching frequency (200 kHz default), multiplied by phase count at the output node.
It integrates three high-side/low-side gate drivers (UGATE1/LGATE1 through UGATE3/LGATE3), supports external PWM4 input for 4-phase expansion, and features dedicated protection logic including preliminary OVP, feedback disconnection detection, and constant-current limiting during overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phase Support | 2- or 3-phase with internal drivers; 4-phase with external PWM driver signal |
| Output Voltage Accuracy | ±0.5% over line, load, and temperature - ensures tight CPU core voltage regulation |
| VID Resolution | 8-bit DAC supporting up to 1.60000 V - compliant with Intel VR11.1 D-VID tables |
| Current Sensing | Full differential inductor current sense per phase (CSx±) - enables accurate per-phase current sharing |
| Remote Sensing | Differential VSEN/FBG inputs - eliminates PCB IR drop error in high-current CPU rails |
| Protection Features | Preliminary OVP, programmable OCP, feedback disconnection, SS_END fault signaling - safeguards CPU and power stage |
| Package | VFQFPN-48, 7 × 7 mm with exposed pad - optimized thermal performance for high-power density VRMs |
Pinout & Package
VFQFPN-48 package (7 × 7 mm, 0.5 mm pitch) with thermally enhanced exposed pad for efficient heat dissipation in high-current VRM applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT1–BOOT3 | High-side driver bootstrap supply | Provides floating gate drive voltage for UGATE1–UGATE3; requires external 100 nF capacitor to PHASEx |
| UGATE1–UGATE3 / LGATE1–LGATE3 | Integrated gate driver outputs | Directly drive HS/LS MOSFET gates; support 2- or 3-phase operation without external drivers |
| CS1±–CS4± | Differential current sense inputs | Enable per-phase current measurement; CS4± used only in 4-phase mode with external driver |
| VID0–VID7 | 8-bit voltage identification inputs | Set output voltage per VR11.1 table; no internal pull-ups - require external resistor network |
| VSEN / FBG | Differential remote voltage sense | Connects to load positive/negative terminals to eliminate PCB trace resistance error |
| IMON | Analog current monitor output | Sources current proportional to total load current; clamped to 1.1 V max for CPU safety |
| LTB / LTBGAIN | Load transient boost control | Enables simultaneous multi-phase activation during load steps; gain set by external RLTBGAIN |
| OCSET/PSI_A | Overcurrent threshold & PSI mode select | ROCSET sets per-phase OCP level; also configures phase count during CPU low-power (PSI#) states |
Key Features
| Feature | Design Value |
|---|---|
| Load Transient Boost (LTB) Technology™ | Simultaneous activation of all active phases during load steps - reduces required bulk capacitance by >30% |
| LSLess Startup | Enables safe startup into pre-biased output rails - prevents reverse current flow into powered loads |
| Differential Droop Voltage Positioning | Programmable offset and droop slope via OFFSET/ROFFSET and IDROOP - maintains stable current sharing across phases |
| Feedback Disconnection Protection | Shuts down output if VSEN/FBG sense lines open - prevents unregulated high-voltage damage to CPU |
| VR11.1 DAC + Backward Compatibility | Native 8-bit D-VID decoding up to 1.60000 V; supports VR10/VR11 tables via OVPSEL pin configuration |
Applications
| Desktop CPU VRM | Server Processor Power |
|---|---|
|
Use Scenario: High-current, dynamically scaled core voltage delivery for Intel Core i7/i9 desktop CPUs with rapid VID transitions. IC Role / Device Role / Timing Role: Multi-phase buck controller managing up to 3 phases with integrated drivers, real-time current sharing, and LTB-enhanced transient response. Use Value: Enables <10 µs load step recovery using fewer ceramic capacitors, reducing BOM cost and PCB area vs. legacy VR10 designs. |
Use Scenario: Dual-socket Xeon server motherboard requiring robust, thermally efficient, and fault-tolerant CPU core rail regulation. IC Role / Device Role / Timing Role: Primary VR11.1 controller with differential remote sensing, programmable OVP/OCP, and SS_END fault signaling for system-level monitoring. Use Value: Delivers ±0.5% voltage accuracy across temperature and load, ensuring CPU stability under sustained 200+ A loads with thermal compensation. |
| Workstation GPU Power | High-Density DC/DC Module |
|
Use Scenario: Compact workstation graphics card needing high-efficiency, low-noise, and fast-transient core voltage regulation for GPU VRMs. IC Role / Device Role / Timing Role: 2-phase controller with LTB and droop-based current sharing - minimizes output ripple and improves transient margin. Use Value: Achieves <5 mV p-p output ripple at 1.2 V/100 A with 2-phase operation, enabling smaller output capacitors and tighter layout constraints. |
Use Scenario: Embedded computing module requiring scalable, pin-compatible VR controller for varying CPU power tiers (e.g., Core i3 to i7). IC Role / Device Role / Timing Role: Configurable 2/3/4-phase controller with VID-programmable voltage, PSI#-managed low-power states, and IMON-based telemetry. Use Value: Supports seamless migration across processor generations via software-configurable VID and phase count - no hardware redesign needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6367 (Renesas) | 4-phase native controller with integrated drivers; supports VR12.5/IMVP7; lacks LTB Technology™ | Targeted at newer Intel platforms with higher current density and digital interface requirements | Select when upgrading to VR12.5/IMVP7 compliance and requiring PMBus telemetry |
| TPS53679 (Texas Instruments) | 6-phase controller with CSD (Current Sense Differential) architecture; supports D-CAP3 mode; no native VR11.1 DAC | Optimized for ultra-fast transient response in cloud server applications with flexible VID mapping | Select when prioritizing sub-100 ns load-step response and need >4-phase scalability |
Compared with ISL6367 and TPS53679, the L6716 offers unique VR11.1-native DAC support, LTB-enhanced transient suppression, and VFQFPN-48 thermal efficiency - making it optimal for cost-sensitive, high-reliability VR11.1 desktop/server deployments where backward compatibility and capacitor reduction are critical.
Availability
L6716 is available at Aetrix Electronics and suitable for desktop CPU VRMs, server processor power supplies, and high-density DC/DC converters requiring stable component supply, long-lifecycle support, and verified thermal performance in compact 7×7 mm packages.
Supply support for L6716 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
STMicroelectronics is a global semiconductor leader specializing in power management, microcontrollers, and analog ICs, with deep expertise in CPU voltage regulation and industrial-grade reliability.
The L6716 belongs to ST's VR11.x controller product line, designed specifically for Intel-compliant multi-phase buck regulation in high-current computing platforms where precision, protection, and thermal efficiency are paramount.
FAQ
What is the function of the LTB pin on the L6716?
The LTB (Load Transient Boost) pin enables simultaneous activation of all active phases during rapid load steps. When configured with RLTB–CLTB to VOUT, it triggers immediate multi-phase conduction to minimize output voltage deviation. Shorting LTB to SGND disables the feature. The LTBGAIN pin sets loop gain via ROFFSET to optimize response without oscillation.
How does the L6716 support VR10/VR11 backward compatibility?
By grounding the OVPSEL pin, the L6716 selects VR10/VR11 voltage tables and fixes the overvoltage protection threshold at 1.800 V (typ). Its 8-bit VID interface remains fully functional, and the DAC retains ±0.5% accuracy. The device automatically interprets VID codes per legacy tables while maintaining all protection and sensing features.
Can the L6716 operate in 4-phase mode without external components?
No - 4-phase operation requires an external PWM driver (e.g., L6741) driven by the PWM4/PH_SEL pin. The L6716 provides only three integrated gate drivers (UGATE1–3/LGATE1–3); the fourth phase must be externally driven. PH_SEL pin state (floating = 2-phase, grounded = 3-phase, driven = 4-phase) configures mode selection.
What protection mechanisms prevent damage during feedback disconnection?
When VSEN or FBG lines disconnect, the internal comparator detects loss of remote sense and forces shutdown within 10 µs. The OUTEN pin is latched low, SSEND goes low, and all gate drivers disable - preventing unregulated high-voltage output. Recovery requires cycling OUTEN or VCC. This protects CPUs from catastrophic overvoltage due to broken sense traces.
L6716 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-VFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Controller, Intel VR11.1
- Voltage - Input:
- 10.8V ~ 13.2V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.03V ~ 1.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VFQFPN (7x7)
L6716 FAQ
1.How can I place an order for L6716 through Aetrix?
Please submit a Request for Quotation (RFQ) for L6716 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 L6716 reliable?
The price and inventory of L6716 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6716 is usually 5 days.
3.What payment methods are accepted for L6716?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6716 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6716?
L6716 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6716 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 L6716?
For technical support, including L6716 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6716 requirements.
6.How does Aetrix verify that L6716 is sourced from the original manufacturer or authorized distributors?
All L6716 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 L6716 meets industry standards.
7.What is the process for return or replacement of L6716?
All L6716 units undergo pre-shipment inspection (PSI). If there is an issue with L6716, 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 L6716 part is unused and in its original packaging.
Return procedure for L6716:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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