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

STMicroelectronics L6758ATR

Name: L6758ATR
Brand: STMicroelectronics
SKU: L6758ATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6758ATR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 48-VFQFN Exposed Pad

Datasheet:: L6758ATR.pdf

Description:: IC REG CTRLR VR12 2OUT 48VFQFPN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6758ATR from STMicroelectronics is a VR12-compliant (4+1)-phase dual voltage regulator controller for Intel® desktop/server CPUs, featuring programmable SVID 1.5 interface, 0.5% output voltage accuracy, dual remote sense, and fully-differential DCR current sensing across both multi-phase (2–4 phase) and single-phase (GFX/VSA) sections.

For engineers reviewing the L6758ATR datasheet, L6758ATR pinout, L6758ATR application, or L6758ATR equivalent, key selection considerations include VR12 SVID bus compliance, independent dual-oscillator frequency control (200–667 kHz), second-generation LTB Technology™ for transient response, VFDE/GDC efficiency optimization, and thermal compensation via single NTC per section.

Technical Context

The L6758ATR implements two independent control loops: a multi-phase section supporting 2–4 phases with per-phase current sensing (CS1P–CS4N), LTB-based error amplification, and dynamic phase management (DPM); and a single-phase section with dedicated PWM (SPWM), current monitor (SIMON), and thermal compensation (STM/STCOMP).

It integrates VR12 serial VID bus management with programmable IMAX/TMAX/VBOOT/ADDRESS registers, adaptive voltage positioning (AVP), pre-biased startup, and dual fault protection (OV/UV/FB disconnection, average & per-phase OC). Both sections support differential current sense, dual VR_RDY signals, and 5 V/12 V supply monitoring.

Key Specifications

Parameter	Value and Actual Design Meaning
VR12 Compliance	Fully compliant with SVID bus rev 1.5 at 25 MHz; enables dynamic VID transitions and processor power-state coordination.
Output Accuracy	±0.5% over temperature and line/load; ensures tight regulation for high-performance CPU cores and graphics domains.
Phase Configuration	Multi-phase: 2–4 phases programmable via PWMx strapping; single-phase: independent 1-phase for GFX/VSA with dedicated SPWM/SENDRV.
Current Sensing	Fully-differential DCR sensing on all 4 multi-phase channels (CS1P–CS4N) and single-phase channel (SCSP/SCSN); supports accurate per-phase load sharing.
Oscillator Range	Multi-phase OSC: 180–220 kHz base, adjustable to 450–550 kHz; single-phase SOSC: 207–253 kHz base, adjustable to 493–667 kHz.
Thermal Compensation	Single NTC per section (TM/TCOMP for multi-phase; STM/STCOMP for single-phase); enables load-line thermal derating without external circuitry.
Protection Features	Dual OV/UV/FB disconnect, average + per-phase OC latching, dual VR_RDY assertion, and open-drain VR_HOT alarm with TMAX threshold.

Pinout & Package

Package: VFQFPN48, 6 × 6 mm, 0.4 mm pitch, exposed thermal pad (GND-connected).

Pin/Terminal	Circuit Role	Design Meaning
CS1P–CS4P / CS1N–CS4N	Multi-phase current sense inputs	Differential inputs for DCR-based current measurement on each of up to 4 phases; require RC filter and Rg termination.
SCSP / SCSN	Single-phase current sense inputs	Dedicated differential inputs for GFX/VSA phase; enable independent current monitoring and droop control.
PWM1–PWM4 / SPWM	Gate drive outputs	CMOS PWM outputs with HiZ capability; strappable for 2/3/4-phase configuration; SPWM controls external single-phase driver.
VR_RDY / SVR_RDY	Power-good status	Open-drain ready signals-freed after soft-start completion, pulled low on any fault; require external pull-up ≤3.3 V.
IMAX/SIMAX / BOOT/ADDR	Pinstrapped configuration	Resistor-divider inputs defining VR12 registers: IMAX (current limit), TMAX (thermal trip), VBOOT (boot voltage), ADDRESS (SVID device ID).
OSC / SOSC	Frequency programming	Analog pins setting switching frequency: OSC for multi-phase (FSW), SOSC for single-phase (FSSW); resistor-to-GND scales frequency linearly.

Key Features

Feature	Design Value
Second-generation LTB Technology™	Enhanced loop stability and sub-100 ns transient response; reduces required output capacitance by >30% vs first-gen controllers.
Dynamic Phase Management (DPM)	Automatic phase shedding/addition based on load; maintains >90% efficiency from 5% to full load in multi-phase section.
Variable Frequency Diode Emulation (VFDE)	Discontinuous conduction mode emulation at light load; eliminates reverse recovery losses in synchronous rectifiers.
Adaptive Voltage Positioning (AVP)	Programmable load-line slope; dynamically lowers output voltage under load to reduce I²R losses while maintaining core margin.
Dual Independent Oscillators	Separate FSW (multi-phase) and FSSW (single-phase) allow optimal frequency selection per domain-e.g., 500 kHz for core, 300 kHz for GFX.

Applications

Desktop CPU VRM

Server Processor VRD

Use Scenario: High-current power delivery to Intel Core i7/i9 and X-series processors in enthusiast desktop platforms.

IC Role / Device Role / Timing Role: Dual-loop VR12 controller managing 4-phase core + 1-phase system agent; coordinates SVID commands and dynamic VID scaling.

Use Value: Enables <1% voltage deviation during 50 A/μs load transients while maintaining AVP compliance and thermal safety via TM/TCOMP.

Use Scenario: Multi-socket server motherboard powering dual Intel Xeon Scalable processors with independent GFX and VSA rails.

IC Role / Device Role / Timing Role: Primary VR controller for CPU core domain (4-phase) and secondary controller for VSA domain (1-phase); shares thermal data via VR_HOT signal.

Use Value: Delivers 0.5% accuracy across -20°C to +85°C ambient and supports DPM-driven phase shedding to meet 80 PLUS Titanium efficiency targets at partial load.

Workstation GPU Power

New-Gen CPU System Agent

Use Scenario: Dedicated VR for high-end discrete GPUs requiring tightly regulated 1.0–1.2 V rail with fast transient response.

IC Role / Device Role / Timing Role: Single-phase section (SPWM/SENDRV) configured as standalone GFX controller; uses SCSP/SCSN for precision current sensing.

Use Value: Achieves <50 mV undershoot on 20 A step load via LTB loop and VFDE; thermal compensation prevents throttling during sustained compute workloads.

Use Scenario: Powering Intel's System Agent (VSA) domain-including memory controller and PCIe root complex-in next-gen client/workstation CPUs.

IC Role / Device Role / Timing Role: Single-phase section operating independently from core VR; programmed via separate SVID address and TMAX register.

Use Value: Provides isolated fault handling (SVR_RDY), independent thermal monitoring (STM/STCOMP), and AVP-tuned droop for stable DDR4/DDR5 memory interface timing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar VR12 dual-controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6367IRZ	Single-package 4+1-phase VR12 controller with integrated MOSFET drivers; no external PWM driver required.	Reduces BOM count but lacks independent single-phase oscillator and VFDE; less flexible for split-domain designs.	Prefer when board space is constrained and driver integration simplifies layout; avoid if separate GFX/VSA frequency tuning is needed.
RT8803AZSP	VR12.5-compliant dual controller with enhanced SVID 2.0 support and faster 300 ns OC response; no LTB Technology.	Supports newer Intel 12th/13th gen CPUs with dynamic SVID extensions; requires different compensation network due to non-LTB loop architecture.	Choose for forward-compatible designs targeting Alder Lake/Raptor Lake; verify thermal compensation compatibility with existing NTC networks.

Compared with ISL6367IRZ and RT8803AZSP, the L6758ATR offers unique flexibility in independent frequency control, proven LTB transient performance, and pinstrapped VR12 register configuration-making it optimal for high-reliability server/desktop VRMs where design longevity and thermal predictability are critical.

Availability

L6758ATR is available at Aetrix Electronics and suitable for high-current VRM/VRD applications in desktops, servers, workstations, and new-generation CPU platforms requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for L6758ATR 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 energy-efficient power conversion.

The L6758ATR belongs to ST's VR12 dual-controller product line, engineered specifically for high-efficiency, high-transient-response power delivery to Intel's multi-domain processors-emphasizing thermal robustness, SVID interoperability, and design-in longevity.

FAQ

What is the maximum supported switching frequency for the multi-phase section?

The L6758ATR's multi-phase oscillator (OSC pin) supports a base frequency of 200 kHz, adjustable up to 550 kHz using an external resistor to GND. The effective output frequency seen at the load equals FSW × N, where N is the number of active phases (2–4), enabling up to 2.2 MHz effective ripple frequency in 4-phase operation.

How does the L6758ATR implement thermal compensation without multiple NTCs?

It uses a single NTC thermistor per power section-connected to TM (multi-phase) or STM (single-phase)-with gain programmable via TCOMP or STCOMP resistor dividers. This allows independent load-line thermal derating for each domain while minimizing BOM count and PCB footprint.

Can the L6758ATR operate with only the single-phase section enabled?

Yes. The single-phase section (SPWM, SIMON, SVR_RDY) operates independently when multi-phase PWM outputs are disabled via pinstrapping or ENDRV deactivation. It retains full functionality including SVID communication, current monitoring, thermal compensation, and protection-ideal for GFX-only or VSA-only applications.

What protection mechanisms prevent false triggering during startup?

The L6758ATR incorporates pre-biased output management, soft-start ramp control (4–6 mV/μs), and delayed fault latching: OC protection activates only after IMON/SIMON voltage reaches 1.55 V with configurable delay via CIMON/CSIMON capacitors, while OV/UV thresholds are held inactive until VCC5 and VCC12 stabilize within UVLO limits.

L6758ATR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Controller, Intel VR12

Voltage - Input:: 10.8V ~ 13.2V

Number of Outputs:: 2

Voltage - Output:: 0.25V ~ 1.52V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-VFQFPN (6x6)

L6758ATR FAQ

1.How can I place an order for L6758ATR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6758ATR 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 L6758ATR reliable?

The price and inventory of L6758ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6758ATR is usually 5 days.

3.What payment methods are accepted for L6758ATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6758ATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6758ATR?

L6758ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6758ATR 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 L6758ATR?

For technical support, including L6758ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6758ATR requirements.

6.How does Aetrix verify that L6758ATR is sourced from the original manufacturer or authorized distributors?

All L6758ATR 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 L6758ATR meets industry standards.

7.What is the process for return or replacement of L6758ATR?

All L6758ATR units undergo pre-shipment inspection (PSI). If there is an issue with L6758ATR, 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 L6758ATR part is unused and in its original packaging.

Return procedure for L6758ATR:

1.Submit a request within 90 days.

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

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