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

STMicroelectronics L6712AQTR

Name: L6712AQTR
Brand: STMicroelectronics
SKU: L6712AQTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6712AQTR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 36-VFQFN Exposed Pad

Datasheet:: L6712AQTR.pdf

Description:: IC REG CTRLR BUCK 36VFQFPN

Quantity:: RFQ Add To RFQ list

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Inventory:1,784

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Product details

Overview

L6712AQTR from STMicroelectronics is a dual-phase synchronous buck controller IC designed for high-current DC/DC conversion in server VRMs and telecom power supplies. It delivers 0.900V–3.300V programmable output voltage with ±0.9% accuracy, 150kHz fixed/adjustable switching frequency per phase (300kHz effective), and integrated 2A high-side/1.8A low-side gate drivers in VFQFPN-36 (6×6×1.0mm) package.

For engineers reviewing the L6712AQTR datasheet, L6712AQTR pinout, L6712AQTR application, or L6712AQTR equivalent, key selection criteria include two-phase interleaved current sharing (±10% accuracy), programmable remote sense amplifier, droop-based load-line control, crowbar-latched OVP, and digital 2048-step soft-start - all critical for CPU/GPU core voltage regulation.

Technical Context

The L6712AQTR implements average current-mode control with 180° phase shift between channels to minimize input ripple and improve thermal distribution. Its error amplifier features 15 V/µs slew rate and 80 dB DC gain, enabling fast transient response under dynamic load steps typical in microprocessor power delivery.

Current sensing uses either MOSFET R_DS(on) or external sense resistors in fully differential mode across ISEN1/PGNDS1 and ISEN2/PGNDS2. The integrated programmable remote sense amplifier (FBG/FBR inputs) compensates for IR drop without external resistor dividers, supporting precise point-of-load regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.900V–3.300V via 3-bit VID code; ±0.9% accuracy over line/temp ensures stable core rail tolerance for modern CPUs.
Switching Frequency	150kHz per phase (300kHz effective at output); externally adjustable via OSC pin current (6kHz/µA gain) for EMI optimization.
Gate Drive Capability	2A source / 2.5Ω sink for UGATE1/2; 1.8A source / 1.1Ω sink for LGATE1/2 - directly drives large N-channel MOSFETs without external buffers.
Current Sharing Accuracy	±10% across phases under static/dynamic loads - enables balanced thermal loading and scalable high-current designs.
Protection Functions	Crowbar-latched OVP (115–130% VOUT), non-latched UVP (55–65% VOUT), and per-phase OCP using R_DS(on) or sense resistor.
Soft-Start	Digital 2048-step ramp - eliminates inrush current and ensures monotonic VOUT rise during power-up sequences.
Reference Output	3mA capable internal bandgap reference on REF_IN/OUT; supports external 0.800–3.300V reference when VID="111".

Pinout & Package

VFQFPN-36 (6×6×1.0mm) package with exposed thermal pad connected to PGND for enhanced thermal dissipation in high-power applications.

Pin/Terminal	Circuit Role	Design Meaning
LGATE1 / LGATE2	Low-side gate driver outputs	Drive N-MOSFET sources; 1.8A drive strength minimizes conduction losses and supports fast turn-off.
UGATE1 / UGATE2	High-side gate driver outputs	Bootstrap-driven outputs; 2A sourcing capability ensures rapid MOSFET turn-on even under heavy capacitive loads.
PHASE1 / PHASE2	HS driver return paths	Connect to HS MOSFET sources; serve as local return for high-side drivers and current-sense reference points.
ISEN1 / ISEN2	Differential current sense inputs	Accept sensed voltage across LS MOSFET R_DS(on) or external resistor; enable per-phase OCP and current balancing.
VSEN	Output voltage monitoring input	Primary feedback for PGOOD, OVP/UVP, and remote sensing; internally tied to remote amplifier output.
REF_IN/OUT	Bidirectional reference pin	Outputs internal 1.235V bandgap (3mA) or accepts external 0.8–3.3V reference - enables flexible regulation schemes.
VID0–VID2	3-bit voltage identification inputs	Program output voltage and protection thresholds; internal 5µA pull-ups allow logic "1" by floating, "0" by grounding.
OSC/INH	Oscillator/inhibit control	Sets frequency via sunk/forced current (6kHz/µA); <0.6V forces inhibit; >4.75V indicates active OVP fault condition.

Key Features

Feature	Design Value
Two-phase interleaved control	180° phase shift reduces input capacitor RMS current by ~30%, allowing smaller, lower-loss bulk capacitance.
Programmable droop effect	50µA droop current at full load enables automatic load-line compensation without external op-amps or resistors.
Integrated remote sense amplifier	Eliminates need for external resistor divider; FBG/FBR inputs support Kelvin sensing to correct for PCB trace IR drop.
Crowbar-latched overvoltage protection	Immediately turns on low-side MOSFETs and asserts FAULT pin - prevents damage to downstream logic during regulator failure.
Digital soft-start	2048-step linear ramp ensures controlled inrush limiting and avoids false PGOOD assertion during startup.

Applications

Server CPU Core Power

GPU VRM Systems

Use Scenario: Regulating 0.8–1.2V core voltage for multi-core Xeon or EPYC processors under dynamic 100A+ load steps.

IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing phase interleaving, current balancing, and fast transient response.

Use Value: ±10% current sharing accuracy and 15 V/µs error amplifier slew rate maintain <±10mV output deviation during 50A/µs load transients.

Use Scenario: Delivering tightly regulated 0.9–1.1V to discrete or integrated GPUs in AI accelerators and gaming workstations.

IC Role / Device Role / Timing Role: High-current DC/DC controller implementing droop-based load-line control and remote sensing at GPU die package.

Use Value: Programmable remote sense amplifier (FBG/FBR) compensates for 20–50mV IR drop across PCIe power delivery traces.

Telecom Baseband Power

Industrial FPGA Power

Use Scenario: Generating stable 1.2V/1.8V rails for 5G baseband processors requiring high PSRR and low noise.

IC Role / Device Role / Timing Role: Two-phase controller with 150kHz fixed frequency and external ROSC adjustment for EMI compliance in dense RF environments.

Use Value: OSC pin programmability allows tuning switching frequency away from sensitive IF bands while maintaining regulation stability.

Use Scenario: Supplying 1.0V core and 1.2V auxiliary rails to high-density FPGAs in industrial PLCs and edge computing nodes.

IC Role / Device Role / Timing Role: Robust controller with crowbar OVP and non-latched UVP protecting FPGA I/O banks and configuration memory.

Use Value: Latched OVP prevents catastrophic overvoltage events; UVP reset behavior ensures safe restart after brownout recovery.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6322IRZ	Supports 3-bit VID but lacks integrated remote sense amplifier; requires external resistor divider for VOUT feedback.	Less suitable for point-of-load regulation where PCB trace resistance exceeds 5mΩ; higher BOM count for same accuracy.	Prefer when cost sensitivity outweighs remote sensing need and layout space permits external components.
TPS53679RSLR	Offers 4-phase operation and PMBus interface; no crowbar OVP - uses standard shutdown on OVP detection.	Better suited for systems requiring telemetry, margining, or firmware-controlled sequencing; not drop-in compatible.	Choose when digital control, telemetry, or >2-phase scalability is required - not for analog-only, safety-critical OVP use cases.

Compared with ISL6322IRZ and TPS53679RSLR, the L6712AQTR uniquely combines integrated remote sensing, crowbar-latched OVP, and VFQFPN-36 thermal performance - making it optimal for space-constrained, high-reliability CPU/GPU core power where analog robustness and Kelvin sensing are mandatory.

Availability

L6712AQTR is available at Aetrix Electronics and suitable for server CPU core power, GPU VRM systems, and telecom baseband power applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for L6712AQTR 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 L6712AQTR belongs to ST's high-performance power controller product line, engineered specifically for high-current, low-voltage DC/DC conversion in microprocessor and ASIC power delivery systems.

FAQ

What is the function of the DROOP pin on the L6712AQTR?

The DROOP pin sources a current proportional to total output current (50µA at full load, 70µA at OCP threshold). When shorted to FB, it implements load-line droop compensation - automatically lowering output voltage under load to improve transient response and stability without external circuitry.

How does the L6712AQTR achieve remote voltage sensing?

It uses dedicated FBG (inverting) and FBR (non-inverting) pins to connect Kelvin sense points at the load. The integrated differential amplifier compares these signals, eliminating errors from PCB trace resistance - no external op-amp or resistor divider is needed for accurate point-of-load regulation.

Can the L6712AQTR operate with an external reference voltage?

Yes - when VID pins are set to "111", the REF_IN/OUT pin accepts an external reference from 0.800V to 3.300V. The device regulates to that reference with ±2.0% accuracy and uses it to set PGOOD, OVP, and UVP thresholds - enabling custom voltage rails beyond internal DAC range.

What happens during overvoltage protection activation?

Upon detecting VSEN >115–130% of programmed VOUT, the L6712AQTR immediately latches into crowbar mode: LGATE1/LGATE2 turn fully ON, UGATE1/UGATE2 turn OFF, and the OSC/INH pin is driven high (~5V) to signal fault. Recovery requires cycling VCC - preventing unsafe re-enabling after failure.

L6712AQTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 2

Output Phases:: 2

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

Frequency - Switching:: 150kHz

Duty Cycle (Max):: 80%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Frequency Control, Phase Control, Power Good

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 36-VFQFPN (6x6)

L6712AQTR FAQ

1.How can I place an order for L6712AQTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6712AQTR 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 L6712AQTR reliable?

The price and inventory of L6712AQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6712AQTR is usually 5 days.

3.What payment methods are accepted for L6712AQTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6712AQTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6712AQTR?

L6712AQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6712AQTR 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 L6712AQTR?

For technical support, including L6712AQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6712AQTR requirements.

6.How does Aetrix verify that L6712AQTR is sourced from the original manufacturer or authorized distributors?

All L6712AQTR 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 L6712AQTR meets industry standards.

7.What is the process for return or replacement of L6712AQTR?

All L6712AQTR units undergo pre-shipment inspection (PSI). If there is an issue with L6712AQTR, 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 L6712AQTR part is unused and in its original packaging.

Return procedure for L6712AQTR:

1.Submit a request within 90 days.

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

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