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

STMicroelectronics L6711TR

Name: L6711TR
Brand: STMicroelectronics
SKU: L6711TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6711TR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 48-TQFP Exposed Pad

Datasheet:: L6711TR.pdf

Description:: IC REG CTRLR BUCK 48-TQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6711TR from STMicroelectronics is a 3-phase synchronous buck controller with integrated 2A gate drivers, designed for high-current CPU voltage regulation in desktop/server/workstation VRM/VRD systems. It delivers 0.5% output voltage accuracy, supports dynamic VID programming (0.8185V–1.5810V in 12.5mV steps or 0.800V–1.550V in 25mV steps), and features fully differential current sensing across either low-side MOSFETs or output inductors.

For engineers reviewing the L6711TR datasheet, L6711TR pinout, L6711TR application, or L6711TR equivalent, key selection criteria include its 150kHz per-phase switching frequency (450kHz ripple), 3% active current sharing accuracy, integrated thermal sensor, programmable OVP/UVP, and TQFP48 exposed-pad package for high-density DC/DC converter designs.

Technical Context

The L6711TR implements a three-phase interleaved step-down architecture with 120° phase shift between channels, enabling reduced input/output ripple and improved transient response. Its adaptive anti-cross-conduction logic prevents shoot-through during HS/LS switching transitions, while the digital soft-start (2048-step) ensures controlled ramp-up of output voltage.

Current sensing is configurable via CS_SEL: LS MOSFET sensing enables duty-cycle limiting and Track&Hold for accurate low-side current measurement, whereas inductor DCR sensing eliminates duty-cycle constraints and supports R-C network compensation. The device embeds a dedicated 3-phase oscillator with external frequency adjustment via OSC/FAULT pin (6kHz/µA gain) and internal fixed 150kHz operation when unconnected.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.8185V–1.5810V (12.5mV steps) or 0.800V–1.550V (25mV steps) - selectable via VID_SEL pin for VRD10.x or VRM-Hammer compliance.
Voltage Accuracy	±0.5% over line, load, and temperature - ensures tight regulation for modern CPU core supplies.
Switching Frequency	150kHz per phase (450kHz effective ripple) - fixed internal oscillator; adjustable via OSC/FAULT pin current sink.
Current Sharing Accuracy	±3% active current balancing across three phases - critical for thermal uniformity and power delivery scalability.
Gate Drive Capability	2A peak source/sink per channel - drives high-Qg MOSFETs directly without external buffers in high-current VRMs.
Protection Features	Programmable OVP (via OVP pin), UVP, pre-OVP, constant-current OCP, and internal crowbar - enables robust fault recovery and system-level safety.
Soft-Start Resolution	Digital 2048-step soft-start - provides precise control over inrush current and output voltage ramp rate.

Pinout & Package

TQFP48 (7×7 mm, 0.5 mm pitch) with exposed thermal pad - optimized for high-power density and thermal dissipation in multi-phase VRM layouts.

Pin/Terminal	Circuit Role	Design Meaning
VCCDR1–3	Low-side driver supply inputs	Independent 5–12V supplies per phase; must be tied together and locally decoupled to PGND for stable gate drive.
UGATE1–3 / LGATE1–3	High-side / Low-side gate drivers	2A peak drive outputs; series resistors recommended to damp ringing and reduce EMI.
CS1±–CS3±	Differential current sense inputs	Supports dual sensing modes (LS MOSFET or inductor DCR); matched routing required for noise immunity.
VID0–5, VID_SEL	Dynamic voltage identification interface	6-bit VID + select pin configure output voltage and protection thresholds per VRD/VRM standard.
OSC/FAULT	Oscillator control / fault indicator	Sinks current to set frequency; pulled high (5V) during OVP/UVP faults - requires OUTEN or VCC cycle for recovery.
SS_END	Soft-start completion signal	Open-drain output asserted after 2048-step ramp - used for sequencing or status monitoring.

Key Features

Feature	Design Value
Fully differential current sensing	Enables accurate phase current measurement in both LS MOSFET and inductor DCR configurations, improving transient response and current balance.
Dynamic VID with 0.5% accuracy	Maintains tight output regulation across CPU P-states and temperature drift, supporting energy-efficient processor scaling.
Integrated remote sense buffer	Compensates for IR drop between VRM output and CPU socket via FBR/FBG inputs - eliminates load regulation error.
Programmable droop function	Uses FB–VSEN resistor network to implement voltage positioning, ensuring stable current sharing under dynamic load conditions.
Thermal compensation via TC pin	Allows resistor-based temperature-dependent offset adjustment - mitigates thermal drift in high-power server applications.

Applications

Desktop CPU VRM

Server CPU VRD

Use Scenario: Power delivery for Intel Pentium 4/Core 2 or AMD Athlon 64 FX processors requiring dynamic voltage scaling.

IC Role / Device Role / Timing Role: Three-phase synchronous buck controller managing core voltage (V_DD) with dynamic VID updates synchronized to CPU P-state transitions.

Use Value: 0.5% voltage accuracy and 3% current sharing ensure stable operation at up to 100A+ loads while minimizing thermal imbalance across phases.

Use Scenario: High-current voltage regulation for dual-socket Xeon or Opteron platforms with strict VRD10.x compliance requirements.

IC Role / Device Role / Timing Role: VRD-compliant controller implementing droop-based current sharing and remote sensing to meet server motherboard power integrity specs.

Use Value: Integrated remote sense buffer and programmable OVP/UVP enable reliable operation under varying board trace impedances and thermal gradients.

Workstation GPU VRM

High-Density DC/DC Module

Use Scenario: Compact, high-efficiency power stage for professional graphics cards with multi-core GPUs demanding rapid load transients.

IC Role / Device Role / Timing Role: Multi-phase controller delivering fast transient response via 2048-step soft-start and adaptive anti-cross-conduction logic.

Use Value: 150kHz per-phase switching (450kHz ripple) reduces output capacitor count while maintaining low output ripple (<15mV_pp).

Use Scenario: Embedded power module for telecom or storage systems where board space and thermal performance are constrained.

IC Role / Device Role / Timing Role: Controller with exposed-pad TQFP48 package and integrated thermal sensor enabling direct heatsink mounting and real-time temperature feedback.

Use Value: On-die thermal sensor and TC pin allow closed-loop thermal compensation - extends reliability in fanless or convection-cooled enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6322IRZ	Supports 4-phase operation, higher max current (120A), but lacks integrated thermal sensor and uses QFN-48 instead of TQFP.	Better suited for next-gen high-core-count CPUs requiring >3-phase support and tighter thermal monitoring.	Select ISL6322IRZ only if 4-phase capability and higher current headroom are required; verify PCB layout compatibility with QFN thermal pad.
RT8803GQW	Offers 3-phase control with integrated MOSFET drivers, but limited to 0.6–1.5V range and no VID_SEL DAC selection mode.	Targeted at cost-sensitive embedded applications rather than VRM/VRD-compliant systems.	Choose RT8803GQW for non-VID applications where VRD10.x/VRM-Hammer compliance is unnecessary and lower BOM cost is prioritized.

Compared with ISL6322IRZ and RT8803GQW, the L6711TR uniquely combines VRD10.x/VRM-Hammer DAC selectability, 0.5% voltage accuracy, and integrated thermal sensing in a TQFP48 package - making it optimal for legacy and mid-life server/desktop VRMs requiring strict compliance and proven reliability.

Availability

L6711TR is available at Aetrix Electronics and suitable for desktop CPU VRMs, server VRDs, and high-density DC/DC converters requiring stable component supply, long-lifecycle support, and consistent electrical performance across production batches.

Supply support for L6711TR 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 headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and computing markets.

The L6711TR belongs to ST's VRM/VRD controller product line, engineered specifically for high-efficiency, multi-phase CPU core voltage regulation with dynamic VID compliance and robust protection for mission-critical computing platforms.

FAQ

What is the function of the VID_SEL pin on the L6711TR?

The VID_SEL pin selects between two DAC voltage tables: floating configures VRD10.x-compliant output (0.8185V–1.5810V in 12.5mV steps), while grounding selects VRM-Hammer mode (0.800V–1.550V in 25mV steps). This determines both the regulated output voltage and associated OVP/UVP thresholds, ensuring compatibility with specific CPU voltage ID protocols.

How does the L6711TR implement current sharing across three phases?

The L6711TR achieves ±3% active current sharing by averaging phase currents through its internal correction loop and adjusting PWM duty cycles dynamically. It supports two sensing methods - low-side MOSFET or inductor DCR - with CS_SEL pin selection. The controller compensates for MOSFET R_DS(on) mismatch and inductor tolerance variations to maintain balanced loading under steady-state and transient conditions.

Can the L6711TR operate without remote sensing?

Yes. When remote sensing is not used, connect VSEN directly to the output voltage node, and leave FBR and FBG unconnected or tied to VSEN. The internal remote sense buffer remains inactive, and the error amplifier uses local feedback. Droop compensation can still be applied via FB–VSEN resistor network to maintain current sharing accuracy in local-sense configurations.

What happens during an over-voltage fault on the L6711TR?

Upon OVP detection, the OSC/FAULT pin is pulled high to ~5V, disabling PWM outputs and turning on all low-side MOSFETs via internal crowbar circuitry to clamp output voltage. The device latches off until OUTEN is cycled low-high or VCC is power-cycled. Programmable OVP threshold is set via external resistor on OVP pin, with default 115% trip point when left floating.

L6711TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 48-TQFP Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 3

Output Phases:: 3

Voltage - Supply (Vcc/Vdd):: 7.5V ~ 15V

Frequency - Switching:: 150kHz

Duty Cycle (Max):: 80%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Frequency Control, Phase Control, Soft Start

Operating Temperature:: 0°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TQFP-EP (7x7)

L6711TR FAQ

1.How can I place an order for L6711TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6711TR 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 L6711TR reliable?

The price and inventory of L6711TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6711TR is usually 5 days.

3.What payment methods are accepted for L6711TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6711TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6711TR?

L6711TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6711TR 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 L6711TR?

For technical support, including L6711TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6711TR requirements.

6.How does Aetrix verify that L6711TR is sourced from the original manufacturer or authorized distributors?

All L6711TR 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 L6711TR meets industry standards.

7.What is the process for return or replacement of L6711TR?

All L6711TR units undergo pre-shipment inspection (PSI). If there is an issue with L6711TR, 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 L6711TR part is unused and in its original packaging.

Return procedure for L6711TR:

1.Submit a request within 90 days.

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

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