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

STMicroelectronics L6713A

Name: L6713A
Brand: STMicroelectronics
SKU: L6713A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6713A

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 64-TQFP Exposed Pad

Datasheet:: L6713A.pdf

Description:: IC REG CTRLR VR10 3OUT 64TQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6713A from STMicroelectronics is a 2/3-phase synchronous buck controller with integrated high-current gate drivers, designed for Intel VR10.x/VR11 and AMD 6-bit CPU voltage regulation. It delivers ±0.5% output voltage accuracy, supports up to 1.60000 V (Intel) or 1.5500 V (AMD), features Load Transient Boost™ technology, differential remote sensing, and operates in TQFP64 10×10 mm package with exposed thermal pad for desktop/server VRD applications.

For engineers reviewing the L6713A datasheet, L6713A pinout, L6713A application, or L6713A equivalent, key selection considerations include phase configuration flexibility (2- vs. 3-phase via PHASE_SEL), dual-edge asynchronous PWM architecture, programmable OVP/OCP thresholds, VID DAC compatibility across Intel and AMD platforms, and embedded thermal monitoring with VR_HOT/VR_FAN outputs.

Technical Context

The L6713A implements a multi-phase step-down controller with 180° (2-phase) or 120° (3-phase) interleaved timing, using adaptive anti-cross-conduction logic per channel to prevent shoot-through. Its current-sense architecture employs full differential sensing across each inductor (CS1±, CS2±, CS3±) with dedicated gain paths feeding a shared current-sharing correction loop.

It integrates a programmable oscillator (200 kHz base per phase, scalable via OSC/FAULT pin), dynamic VID management with D-VID support, and a dual-mode DAC: 7/8-bit for Intel VR10.x/VR11 (1.60000 V max) and 6-bit for AMD (1.5500 V max), both achieving ±0.5% output accuracy over line and temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Configuration	Selectable 2-phase (180°) or 3-phase (120°) operation via PHASE_SEL pin; enables optimal power density and ripple cancellation.
Output Voltage Accuracy	±0.5% over line, load, and temperature; ensures tight regulation for modern CPU core voltage requirements.
DAC Resolution & Range	7/8-bit Intel VR10.x/VR11 DAC (up to 1.60000 V); 6-bit AMD DAC (up to 1.5500 V); supports dynamic VID transitions.
Load Transient Response	LTB Technology™ enables simultaneous multi-phase activation during load steps, reducing required bulk capacitance by up to 40%.
Current Sensing	Full differential sensing per phase (CS1±–CS3±); eliminates PCB trace resistance error and improves current sharing accuracy.
Thermal Monitoring	Embedded VRD thermal monitor with two independent open-drain outputs: VR_FAN (warning) and VR_HOT (alarm).
Protection Features	Programmable OVP (via OVP pin), preliminary OVP, UVP, cycle-by-cycle OCP (via OCSET), and latch-off fault response.
Package	TQFP64 10×10 mm with exposed thermal pad; optimized for high-power dissipation in compact VRM modules.

Pinout & Package

TQFP64 (10×10 mm) with exposed thermal pad connected to PGND plane via multiple vias for enhanced thermal performance and EMI control.

Pin/Terminal	Circuit Role	Design Meaning
UGATE1–3, LGATE1–3	High-side and low-side gate driver outputs	Drive external N-channel MOSFETs; each HS output includes boot supply path (BOOTx/PHASEx) with internal anti-cross-conduction logic.
CS1±–CS3±	Differential current sense inputs	Enable accurate per-phase current measurement across inductors; critical for droop control and current sharing in multi-phase designs.
VID0–VID7 / VID_SEL	Dynamic voltage identification interface	Configures output voltage code (Intel VR10.x/VR11 or AMD 6-bit); VID_SEL selects DAC mode; D-VID supported in both modes.
VSEN / FBG / FB / COMP	Remote voltage sensing and regulation loop	Differential sensing (VSEN–FBG) rejects IR drop; FB/COMP form type-II compensation network for stable loop response.
SS/ LTBG/ AMD	Multi-function configuration pin	Selects Intel/AMD DAC mode; sets soft-start time and LTB™ gain; enables system-level coordination of startup and transient response.
VR_HOT / VR_FAN / TM	Thermal monitoring interface	TM reads external thermistor network; VR_FAN signals warning threshold; VR_HOT signals critical overtemperature shutdown condition.

Key Features

Feature	Design Value
Load Transient Boost™ (LTB)	Simultaneous multi-phase activation during load steps reduces output capacitor count and cost while maintaining <1% voltage deviation.
Dual-edge asynchronous PWM	Enables variable on-time control without fixed frequency constraints; improves light-load efficiency and transient agility.
Embedded thermal monitor	Integrated analog front-end for thermistor-based temperature sensing with two independent alarm outputs (VR_FAN/VR_HOT).
Differential remote voltage sensing	Rejects PCB trace resistance error between VR and CPU; maintains ±0.5% regulation at point-of-load under high-current conditions.
Low-side-less startup	Enables safe initial power-up without low-side MOSFET conduction; prevents inrush current issues in high-droop VR designs.
Adjustable switching frequency	200 kHz base per phase (scalable via OSC/FAULT pin); effective output ripple frequency = N × FSW (N = phase count).

Applications

Desktop CPU VRD

Workstation VRM Module

Use Scenario: High-current voltage regulation for Intel Core 2 Duo or AMD Athlon 64 X2 processors in ATX desktop motherboards.

IC Role / Device Role / Timing Role: Primary 2/3-phase buck controller managing core voltage (VDD), coordinating VID updates, and enforcing Intel VR10/AMD 6-bit compliance.

Use Value: ±0.5% voltage accuracy and LTB™ ensure stable CPU operation during rapid P-state transitions with minimal output capacitance.

Use Scenario: Compact, high-efficiency VRM module for dual-socket workstation motherboards supporting Xeon or Opteron CPUs.

IC Role / Device Role / Timing Role: Integrated controller + driver solution enabling 3-phase interleaving, differential sensing, and thermal-aware throttling.

Use Value: Exposed thermal pad and VR_HOT/VR_FAN outputs allow direct integration into thermal management firmware for predictive fan control and shutdown.

Server CPU Power Supply

VRM Reference Design Platform

Use Scenario: Multi-rail power delivery for dual-CPU server boards requiring strict VR11 compliance and high reliability.

IC Role / Device Role / Timing Role: Central controller implementing dynamic VID, programmable OVP/OCP, and droop-based current sharing across parallel phases.

Use Value: DROOP pin enables hardware-based current balancing without external op-amps; reduces BOM count and layout complexity.

Use Scenario: STMicroelectronics reference design platform for evaluating VR11-compliant power stages with discrete MOSFETs.

IC Role / Device Role / Timing Role: Fully featured evaluation controller demonstrating PHASE_SEL configuration, SS/ LTBG/ AMD pin multiplexing, and thermal feedback integration.

Use Value: Pin-compatible layout with documented thermal via pattern and current-sense routing guidelines accelerates time-to-prototype for OEM VRM development.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6322	3-phase controller with integrated drivers; supports Intel VR11.3 but lacks AMD 6-bit DAC mode and LTB™ technology.	Targeted exclusively at Intel platforms; no native AMD VID compatibility or thermal monitor outputs.	Choose ISL6322 only for Intel-only designs requiring VR11.3 compliance and higher integration density.
RT8803	2/3-phase controller with external driver support; offers programmable droop and OVP but no embedded thermal monitor or differential sensing.	Requires external current-sense amplifiers and thermal ICs; increases component count and layout sensitivity.	Prefer RT8803 when cost-sensitive designs prioritize external driver flexibility over integrated thermal/current sensing.

Compared with ISL6322 and RT8803, the L6713A uniquely combines Intel/AMD dual-DAC support, embedded thermal monitoring with dual alarm outputs, and LTB™-enhanced transient response - making it optimal for mixed-platform VRD designs where BOM simplification and fast load-step recovery are critical.

Availability

L6713A is available at Aetrix Electronics and suitable for desktop CPU VRD, workstation VRM modules, and server CPU power supplies requiring stable component supply, long-lifecycle support, and consistent electrical performance across production batches.

Supply support for L6713A 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, Switzerland, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and computing markets.

The L6713A belongs to ST's VRD/VRM controller product line, engineered specifically for high-efficiency, multi-phase CPU core voltage regulation in desktop, workstation, and entry-server platforms with strict Intel VR10/VR11 and AMD compliance requirements.

FAQ

What is the function of the SS/ LTBG/ AMD pin?

This multi-function pin configures three critical operating modes: grounding it selects AMD 6-bit DAC mode; leaving it floating enables Intel VR10.x/VR11 DAC mode. In Intel mode, its voltage level also sets soft-start duration and LTB™ gain (1×–4×). It directly controls startup behavior, transient response aggressiveness, and platform compatibility - no external configuration IC is needed.

How does L6713A achieve ±0.5% output voltage accuracy?

The ±0.5% accuracy is achieved through factory-trimmed DAC references, differential remote sensing (VSEN/FBG), and precision error amplifier (FB/COMP) with matched internal resistors. It holds across –40°C to +125°C ambient, 4.5 V to 14 V VCC, and full load range - verified per STMicroelectronics' Electrical Characteristics table (Section 4, Rev 3 datasheet), not extrapolated from typical values.

Can L6713A operate in 2-phase mode with only two external MOSFETs?

Yes - tie PHASE_SEL high to select 2-phase mode, then leave UGATE2/BOOT2/PHASE2/LGATE2/VCCDR2/PGND2 pins unconnected (per datasheet Section 2.1). Current sensing for Phase 2 (CS2±) must be shorted to SGND or VOUT. The controller disables Phase 3 internally and maintains full functionality including LTB™, VID, and protections on the active two phases.

What thermal protection mechanisms does L6713A provide?

L6713A provides two-tier thermal protection: VR_FAN asserts when die temperature exceeds ~95°C (warning), and VR_HOT asserts above ~115°C (critical). Both are open-drain outputs referenced to SGND, driven by an internal analog comparator monitoring the TM pin voltage from an external thermistor divider. Thermal monitoring remains active as long as VCC > UVLO threshold (~4.5 V).

L6713A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-TQFP Exposed Pad

Packaging:: Tray

Product Status:: Obsolete

Applications:: Controller, Intel VR10, VR11, AMD CPU

Voltage - Input:: 10.8V ~ 13.2V

Number of Outputs:: 3

Voltage - Output:: 0.3V ~ 1.6V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 64-TQFP-EP (10x10)

L6713A FAQ

1.How can I place an order for L6713A through Aetrix?

Please submit a Request for Quotation (RFQ) for L6713A 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 L6713A reliable?

The price and inventory of L6713A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6713A is usually 5 days.

3.What payment methods are accepted for L6713A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6713A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6713A?

L6713A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6713A 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 L6713A?

For technical support, including L6713A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6713A requirements.

6.How does Aetrix verify that L6713A is sourced from the original manufacturer or authorized distributors?

All L6713A 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 L6713A meets industry standards.

7.What is the process for return or replacement of L6713A?

All L6713A units undergo pre-shipment inspection (PSI). If there is an issue with L6713A, 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 L6713A part is unused and in its original packaging.

Return procedure for L6713A:

1.Submit a request within 90 days.

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

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