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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

STMicroelectronics L6756DTR

Name: L6756DTR
Brand: STMicroelectronics
SKU: L6756DTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6756DTR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 40-VFQFN Exposed Pad

Datasheet:: L6756DTR.pdf

Description:: IC REG CTRLR VR10 4OUT 40VFQFPN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6756DTR from STMicroelectronics is a 2/3/4-phase buck controller designed for Intel VR10, VR11, and VR11.1 CPU power delivery, featuring LTB Technology® for enhanced load transient response, ±0.5% output voltage accuracy over line/load/temperature, and full-differential DCR current sensing. It supports scalable multi-phase operation up to 4 phases and integrates remote sense buffer and feedback disconnection protection for high-current desktop/server CPU VRMs.

For engineers reviewing the L6756DTR datasheet, L6756DTR pinout, L6756DTR application, or L6756DTR equivalent, key selection criteria include VR11.x DAC programmability (7/8-bit VID), PSI#-enabled low-power state management, adjustable 100 kHz–1 MHz oscillator, LSLess startup for pre-biased outputs, and VFQFPN40 6×6 mm thermal performance with R_thJC = 1 °C/W.

Technical Context

The L6756DTR implements a dual-edge asynchronous PWM architecture with selectable 2-, 3-, or 4-phase operation via G2/G4 pin strapping. Its LTB Technology® dynamically boosts loop gain during load transients using the LTB and LTB_GAIN pins, minimizing output filter requirements while maintaining stability under dynamic CPU loads.

It embeds an integrated 2.5 V reference (VREF), supports VR10/VR11.x DAC modes via PSI_A/PSI# configuration, and delivers precise voltage positioning through IMON, VDRP, and differential current sense inputs (CS1–CS4, CS1N–CS4N) with droop-based current sharing and ±4 μA droop accuracy.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase support	Configurable 2/3/4-phase operation via G2/G4 pin strapping - enables scalable current handling from ~60 A to >150 A with external drivers.
Output voltage accuracy	±0.5% over line, load, and temperature - ensures stable core voltage for Intel CPUs across operating conditions.
VID resolution	7/8-bit programmable DAC (VR10/VR11.1) - supports 6.25 mV steps down to 0.1 V for fine-grained CPU voltage control.
Oscillator range	100 kHz to 1 MHz via ROSC resistor - sets per-phase switching frequency; total effective frequency at load = N × F_SW.
Current sensing	Full-differential DCR sensing across all phases - eliminates offset errors and enables accurate per-phase current monitoring.
Protection features	OVP/UVP, feedback disconnection, overcurrent (ILIM threshold at 1.7 V), and VR_RDY open-drain fault indicator - safeguards CPU and power stage.
Package	VFQFPN40 6×6 mm with exposed thermal pad - provides R_thJC = 1 °C/W for high-power density CPU VRM designs.

Pinout & Package

VFQFPN40 6×6 mm package with 40-pin layout and exposed thermal pad connected to PGND for optimal thermal dissipation (R_thJC = 1 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 (EN)	Enable input	Internally pulled up to 3.3 V; pull low to disable controller - supports system-level power sequencing.
2–9 (VID0–VID7)	VR voltage identification	3.3 V-tolerant digital inputs defining output voltage per Intel VR10/VR11.x tables - enables dynamic DVID transitions.
10 (PSI#/VR10)	Power state indicator / DAC mode select	Configured by PSI_A: asserts low for VR11 low-power states or selects VR10 DAC when shorted to SGND.
12 (ROSC)	Oscillator programming	Resistor-to-GND sets per-phase F_SW (10 kHz/µA); floating = 200 kHz - determines ripple, efficiency, and component size.
13 (ILIM)	Overcurrent threshold	Sources DROOP current; OC triggers at 1.7 V - sets current limit independent of inductor DCR tolerance.
16–17 (FBG/VSEN)	Remote sense inputs	FBG connects to load ground, VSEN to load V_CORE - enables Kelvin sensing to reject PCB IR drop.
30–33 (G1–G4)	PWM outputs	CMOS drivers for external high-side MOSFETs - phase count set by grounding G2/G4; HiZ capable for phase shedding.
40 (IMON)	Current monitor output	Sources current proportional to total load - clamped to 1.1 V max for safe interfacing with VR11.1 CPUs.

Key Features

Feature	Design Value
LTB Technology®	Dynamically enhances loop bandwidth during load transients - reduces required bulk capacitance by up to 40% in VRM designs.
LSLess startup	Enables soft-start into pre-biased outputs - prevents reverse inductor current and negative voltage spikes at CPU V_CORE.
Flexible driver interface	Gx outputs support HiZ mode and phase shedding - allows seamless transition between 2/3/4-phase operation without firmware change.
Integrated remote sense buffer	Eliminates need for external op-amps in Kelvin sense path - improves noise immunity and reduces BOM count.
Feedback disconnection protection	Shuts down on FBG/VSEN open-circuit - prevents unregulated high voltage at CPU due to PCB trace disconnect.

Applications

Desktop CPU VRM

Server Processor Power

Use Scenario: High-current voltage regulation for Intel Core i7/i9 and Xeon E5/E7 processors in ATX motherboards.

IC Role / Device Role / Timing Role: Multi-phase buck controller managing dynamic VID updates, phase shedding, and load-line compensation.

Use Value: ±0.5% voltage accuracy and LTB-enhanced transient response ensure CPU stability during turbo boost and AVX workloads.

Use Scenario: Dual-socket server boards requiring redundant, high-efficiency CPU core power with thermal headroom.

IC Role / Device Role / Timing Role: Primary VR11.1-compliant controller coordinating with PMBus-enabled PMICs for rail sequencing and telemetry.

Use Value: VFQFPN40 package with 1 °C/W R_thJC sustains >120 A continuous output under 70 °C ambient without forced airflow.

Workstation GPU Power

High-Density DC/DC Converter

Use Scenario: Power delivery for NVIDIA Quadro and AMD Radeon Pro GPUs with aggressive dynamic power profiles.

IC Role / Device Role / Timing Role: 4-phase controller implementing voltage positioning and PSI#-driven low-power states during GPU idle cycles.

Use Value: Programmable soft-start (500 µs typical) and LSLESS startup prevent inrush damage during GPU hot-plug events.

Use Scenario: Compact 1U network switch or AI accelerator card requiring >100 A at <1.0 V in minimal board area.

IC Role / Device Role / Timing Role: Scalable phase controller enabling layout-optimized interleaved inductor placement and reduced input/output ripple.

Use Value: Dual-edge asynchronous architecture lowers EMI compared to traditional fixed-frequency controllers, easing EMC certification.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6367IRZ	6-phase capable, integrated MOSFET drivers, no LTB Technology®, requires external DAC for VR11.1	Targets higher-current server platforms (>200 A); lacks LSLess startup and VR_RDY fault signaling	Select for systems needing >4 phases or integrated drivers; avoid if LTB transient enhancement or pre-biased startup is required.
RT8803AZSP	4-phase, VR12.5/VR13 compliant, 0.5% accuracy, but no PSI# support or remote sense buffer integration	Designed for newer Intel 10nm+/AMD Zen 3+ platforms; lacks VR10 backward compatibility and feedback disconnection protection	Choose for next-gen CPU support where VR11.1 legacy features and robustness against sense-line faults are non-critical.

Compared with ISL6367IRZ and RT8803AZSP, the L6756DTR uniquely combines VR10/VR11.1 dual-mode DAC, LTB-enhanced transient response, and integrated remote sense buffer - making it optimal for cost-sensitive, thermally constrained VRM designs requiring backward compatibility and field-proven reliability.

Availability

L6756DTR is available at Aetrix Electronics and suitable for desktop motherboard VRMs, server CPU power supplies, and workstation GPU power delivery requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for L6756DTR 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 decades of expertise in CPU VRM solutions for computing markets.

The L6756DTR belongs to ST's VRM controller product line, engineered specifically for Intel-compatible multi-phase core power delivery - emphasizing transient response, voltage accuracy, and system-level protection in space-constrained computing applications.

FAQ

What is the maximum supported output current for L6756DTR?

The L6756DTR itself does not deliver current; it controls external high-side MOSFETs. With four phases driving 60 A per phase (using 3 mΩ DCR inductors and 30 A-rated drivers), total output can exceed 200 A. Actual current is limited by external components, PCB layout, and thermal design - the VFQFPN40 package supports junction temperatures up to 125 °C under sustained 120 A load with proper heatsinking.

Does L6756DTR support VR12 or newer CPU specifications?

No. The L6756DTR is explicitly designed for Intel VR10, VR11, and VR11.1 specifications only. It lacks VR12/VR13 features such as SVID interface, adaptive voltage positioning (AVP), or SMBus communication. For VR12+, ST recommends the STNRG388A or third-party alternatives like Renesas ISL91302B.

How is phase count configured on L6756DTR?

Phase count is set by strapping G2 and/or G4 pins to GND: G4 grounded = 3-phase; G2 and G4 grounded = 2-phase; both floating = 4-phase. This hardware-selectable configuration avoids firmware dependencies and enables flexible board reuse across different CPU power tiers without changing the controller IC.

Can L6756DTR operate without remote sense connections?

Yes, but with reduced accuracy. If FBG and VSEN are tied directly to local ground and output, the controller operates in local-sense mode - losing Kelvin compensation for PCB IR drop. Voltage accuracy degrades to ±1.5% typical due to trace resistance, and feedback disconnection protection becomes inactive. Remote sense is strongly recommended for CPU VRMs where <1% regulation is required.

L6756DTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 40-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Controller, Intel VR10, VR11, VR11.1

Voltage - Input:: 10.8V ~ 13.2V

Number of Outputs:: 4

Voltage - Output:: 0.3V ~ 1.6V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 40-VFQFPN (6x6)

L6756DTR FAQ

1.How can I place an order for L6756DTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6756DTR 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 L6756DTR reliable?

The price and inventory of L6756DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6756DTR is usually 5 days.

3.What payment methods are accepted for L6756DTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6756DTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6756DTR?

L6756DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6756DTR 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 L6756DTR?

For technical support, including L6756DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6756DTR requirements.

6.How does Aetrix verify that L6756DTR is sourced from the original manufacturer or authorized distributors?

All L6756DTR 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 L6756DTR meets industry standards.

7.What is the process for return or replacement of L6756DTR?

All L6756DTR units undergo pre-shipment inspection (PSI). If there is an issue with L6756DTR, 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 L6756DTR part is unused and in its original packaging.

Return procedure for L6756DTR:

1.Submit a request within 90 days.

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

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