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

STMicroelectronics L6712QTR

Name: L6712QTR
Brand: STMicroelectronics
SKU: L6712QTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6712QTR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 36-VFQFN Exposed Pad

Datasheet:: L6712QTR.pdf

Description:: IC REG CTRLR BUCK 36VFQFPN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6712QTR 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 0.900–3.300 V output with ±0.9% accuracy, supports 150 kHz per-phase switching (300 kHz effective), integrates 2 A high-side and 1.8 A low-side gate drivers, and implements programmable droop current (50 µA at full load) for precise current sharing.

For engineers reviewing the L6712QTR datasheet, L6712QTR pinout, L6712QTR application, or L6712QTR equivalent, this device is selected for high-efficiency, fast-transient, multi-phase CPU/GPU core voltage regulation where remote sensing, digital soft-start (2048-step), and crowbar OVP protection are critical design requirements.

Technical Context

The L6712QTR implements interleaved two-phase operation with 180° phase shift to halve input ripple current and reduce EMI. Its average current-mode control uses differential current sensing via ISEN1/ISEN2 pins-measuring either MOSFET R_ds(on) or external sense resistors-with ±10% static/dynamic current sharing accuracy.

It features a programmable 3-bit VID interface (supporting eight internal reference voltages or external 0.8–3.3 V reference), integrated remote sense amplifier (FBG/FBR inputs), and adaptive anti-cross-conduction logic to prevent shoot-through during HS/LS transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.900–3.300 V (via 3-bit VID code); ±0.9% accuracy over line/temp includes EA offset compensation
Switching Frequency	150 kHz per phase (300 kHz effective at output); adjustable via OSC pin current (6 kHz/µA gain)
Gate Drive Capability	2 A high-side source/sink (UGATE1/2); 1.8 A low-side source (LGATE1/2); R_HGATE = 2 Ω typ., R_LGATE = 1.1 Ω typ.
Current Sensing	Differential sensing on ISEN1/ISEN2 with 50 µA droop current at full load; supports R_ds(on) or resistor-based sensing
Protection Features	Crowbar-latched OVP (115–130% V_OUT), non-latched UVP (55–65% V_OUT), per-phase OCP using LS FET conduction
Soft-Start	Digital 2048-step soft-start; IFB_START = 65 µA during startup; PGOOD asserts after voltage stabilizes within ±8%
Reference Output	REF_IN/OUT provides 3 mA capable internal bandgap (1.235 V); accepts external 0.8–3.3 V reference when VID = "111"

Pinout & Package

VFQFPN-36 (6 × 6 × 1.0 mm) package with exposed thermal pad connected to PGND. Pin count: 36 terminals; 4 pins internally NC (N.C. in SO-28 mapping). Thermal resistance R_thj-amb = 30 °C/W on 4-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
LGATE1 / LGATE2	Low-side gate driver outputs	Drive LS N-MOSFET gates; require series resistor to damp ringing and reduce dissipation
UGATE1 / UGATE2	High-side gate driver outputs	Drive HS N-MOSFET gates; boot-strapped supply referenced to PHASE1/PHASE2
PHASE1 / PHASE2	HS driver return paths	Connect directly to HS MOSFET source; serve as switching node references for UGATE drivers
VSEN	Main output voltage monitor	Inputs to OVP/UVP comparators and PGOOD logic; also connects to remote sense amplifier output
FBR / FBG	Remote sense amplifier inputs	FBR = positive load side; FBG = negative load side; enable Kelvin sensing without external divider
VID0–VID2	3-bit voltage identification inputs	Internally pulled up; ground to set '0', float for '1'; define V_OUT, PGOOD, OVP, UVP thresholds
OSC/INH/FAULT	Oscillator frequency control & fault signaling	Sinks/forces current to adjust f_SW; pulled high (5 V) during OVP latch; <0.6 V enables inhibit mode
PGNDS1 / PGNDS2	Power ground sense returns	Must be routed adjacent to ISEN1/ISEN2 traces to reject common-mode noise in current measurement

Key Features

Feature	Design Value
Interleaved two-phase control	180° phase shift reduces input capacitor RMS current by ~30%, enabling smaller bulk capacitance
Programmable droop current	50 µA at full load sourced from DROOP pin; enables passive current balancing without master-slave communication
Integrated remote sense amplifier	Eliminates external resistor divider; compensates for IR drop across PCB traces between regulator and load
Digital soft-start	2048-step linear ramp prevents inrush current; avoids overshoot during power-up of sensitive loads
Crowbar OVP protection	Immediately latches by turning on LS FETs and pulling FAULT high; requires VCC cycle to reset

Applications

Server CPU VRM

Telecom Base Station PSU

Use Scenario: Regulating core voltage for multi-core Xeon or EPYC processors under dynamic load steps up to 100 A/µs.

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

Use Value: ±10% current sharing accuracy and ultra-fast load transient response maintain V_OUT within ±1% during 50 A step changes.

Use Scenario: Providing stable 1.2 V/60 A intermediate bus for RF power amplifiers in 5G macro base stations.

IC Role / Device Role / Timing Role: High-current DC/DC controller with remote sensing to compensate for long PCB trace losses.

Use Value: Integrated remote sense amplifier (FBR/FBG) eliminates 30 mV output error caused by 50 mΩ distribution resistance.

GPU Power Delivery

Industrial FPGA Core Supply

Use Scenario: Delivering tightly regulated 0.85 V to high-end AI accelerators with burst-mode workloads.

IC Role / Device Role / Timing Role: Two-phase controller implementing droop-based current sharing between parallel phases.

Use Value: Programmable 50 µA droop current ensures balanced phase loading without requiring current-sense resistor matching.

Use Scenario: Powering Xilinx Versal or Intel Stratix 10 FPGA core rails in ruggedized industrial controllers.

IC Role / Device Role / Timing Role: Robust buck controller with crowbar OVP and non-latched UVP for mission-critical uptime.

Use Value: Crowbar OVP latches LS FETs within 100 ns of overvoltage detection, preventing downstream IC damage.

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 op-amp for Kelvin sensing	Used in legacy server VRMs where board space allows discrete remote sense circuitry	Select when cost sensitivity outweighs layout simplification benefits of integrated remote sensing
TPS53679RSLR	Higher integration: includes PMBus interface, telemetry, and 4-phase support; 1.5 A gate drive vs. 2 A	Targeted at next-gen servers requiring digital monitoring and firmware-configurable parameters	Select when system-level telemetry, phase extension, or dynamic configuration via PMBus is required

Compared with ISL6322IRZ, L6712QTR reduces BOM count by integrating remote sensing; versus TPS53679RSLR, it offers higher gate drive strength and simpler analog control-ideal for cost-optimized, high-reliability analog VRMs without digital management needs.

Availability

L6712QTR is available at Aetrix Electronics and suitable for server CPU VRMs, telecom base station PSUs, GPU power delivery, and industrial FPGA core supplies requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for L6712QTR 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.

L6712QTR belongs to ST's high-performance power controller product line, engineered specifically for high-current, low-voltage DC/DC conversion in datacenter and communications infrastructure where efficiency, transient response, and reliability are paramount.

FAQ

What is the function of the DROOP pin on the L6712QTR?

The DROOP pin sources a current proportional to total output current (50 µA at full load, 70 µA at OCP threshold). When shorted to FB, it implements droop-based current sharing between phases. If left unconnected or grounded via ≤43 kΩ, the current signal can be repurposed for external monitoring or control functions.

How does the L6712QTR achieve remote voltage sensing without external resistors?

It uses dedicated FBR (positive load side) and FBG (negative load side) pins feeding an integrated differential remote sense amplifier. This amplifier replaces the traditional feedback resistor divider, directly compensating for IR drop across PCB traces and maintaining regulation accuracy at the load point.

Can the L6712QTR operate with an external reference voltage?

Yes-when VID2:VID0 = "111", the REF_IN/OUT pin accepts an external reference from 0.800 V to 3.300 V. The internal DAC is disabled, and regulation, PGOOD, OVP, and UVP thresholds all track the applied external reference with ±2.0% accuracy.

What happens during an overvoltage fault on the L6712QTR?

Upon detecting >115% V_OUT at VSEN, the device activates crowbar protection: LGATE1/LGATE2 are forced high, turning on both low-side MOSFETs to clamp the output, while the OSC/INH pin is pulled high (5 V) to signal FAULT. Recovery requires cycling VCC power.

L6712QTR 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)

L6712QTR FAQ

1.How can I place an order for L6712QTR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6712QTR 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 L6712QTR reliable?

The price and inventory of L6712QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6712QTR is usually 5 days.

3.What payment methods are accepted for L6712QTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6712QTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6712QTR?

L6712QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6712QTR 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 L6712QTR?

For technical support, including L6712QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6712QTR requirements.

6.How does Aetrix verify that L6712QTR is sourced from the original manufacturer or authorized distributors?

All L6712QTR 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 L6712QTR meets industry standards.

7.What is the process for return or replacement of L6712QTR?

All L6712QTR units undergo pre-shipment inspection (PSI). If there is an issue with L6712QTR, 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 L6712QTR part is unused and in its original packaging.

Return procedure for L6712QTR:

1.Submit a request within 90 days.

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

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