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

STMicroelectronics L6726A

Name: L6726A
Brand: STMicroelectronics
SKU: L6726A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6726A

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: L6726A.pdf

Description:: IC REG CTRLR BUCK 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:1,276

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Product details

Overview

L6726A from STMicroelectronics is a single-phase synchronous buck PWM controller with integrated high-current MOSFET drivers, designed for DC-DC step-down conversion in subsystem and CPU power supplies. It features 0.8 V internal reference, ±1% output voltage accuracy over line/temperature, fixed 270 kHz switching frequency, sensorless overcurrent protection via low-side R_DS(ON) sensing, and SO-8 package.

For engineers reviewing the L6726A datasheet, L6726A pinout, L6726A application, or L6726A equivalent, key selection considerations include its 1.5 V minimum input capability, programmable soft-start, FB disconnection protection, adaptive dead-time control, and support for 5–12 V V_CC supply with integrated 1.5 A gate drivers.

Technical Context

The L6726A implements a transconductance error amplifier with 5 mS gm and 70 dB open-loop gain, externally compensated via COMP/FB network. Its oscillator is fixed at 270 kHz (±10%) with 1.1 V ramp amplitude and 80% max duty cycle, enabling stable operation across wide input ranges.

Protection architecture includes latched dual-cycle overcurrent detection triggered by PHASE-to-GND voltage exceeding a programmable threshold (50–550 mV), UVLO with 4.1 V turn-on and 0.2 V hysteresis, and FB disconnection safeguard using 100 nA internal bias current to clamp output voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	Fixed 270 kHz - enables predictable EMI profile and simplifies filter design for compact DC-DC converters.
Output Voltage Accuracy	±1% at 0.8 V reference - ensures tight regulation for low-voltage CPU/DSP core supplies under load/temperature variation.
Gate Drive Capability	1.5 A HS source / 1.5 A LS source - directly drives N-channel MOSFETs without external buffers, supporting parallel FET configurations.
OC Threshold Range	50–550 mV via ROCSET resistor - eliminates sense resistor, reduces BOM cost and PCB area while enabling precise current limit tuning.
V_CC Operating Range	4.1 V to 13.2 V - supports direct connection to 5 V or 12 V system rails, simplifying auxiliary supply design.
Min Input Voltage	1.5 V VIN - enables use in low-input distributed power architectures, including post-regulated intermediate bus applications.
Soft-Start Current	10 µA sourced from COMP pin - linearly charges external RC network to control output voltage ramp rate and limit inrush current.

Pinout & Package

Package: SO-8 (Small Outline, 8-pin, surface-mount). Thermal resistance R_thJA = 85 °C/W on 2S2P board; junction temperature range –20 °C to +150 °C.

Pin/Terminal	Circuit Role	Design Meaning
BOOT	HS driver bootstrap supply	Connects via 100 nF capacitor to PHASE node; provides floating supply for high-side gate drive in synchronous buck topology.
UGATE	High-side MOSFET gate driver output	Drives HS FET gate with 1.5 A peak source/sink; integrates anti-shoot-through logic and adaptive dead-time control.
GND	Power and signal reference ground	Common return path for internal references, logic, drivers, and feedback network; must connect to low-impedance PCB ground plane.
LGATE / OC	Low-side gate driver output & OCP threshold set	Drives LS FET gate (1.5 A); also sources 10 µA to program OC threshold via ROCSET resistor to GND (5–55 kΩ).
VCC	IC and LS driver supply	Primary power input (4.1–13.2 V); powers internal circuitry and low-side driver; requires ≥1 µF MLCC decoupling to GND.
FB	Error amplifier inverting input	Senses regulated output via resistor divider; internal 100 nA bias prevents uncontrolled rise if disconnected (FB disconnection protection).
COMP / DIS	Error amplifier output & enable/disable control	External compensation node; pulled low (<0.4 V) disables PWM and gates; sources 10 µA during soft-start to charge RC network.
PHASE	HS/LS switch node & current sense input	Connects to LS drain; used for R_DS(ON)-based current sensing, adaptive dead-time monitoring, and low-side-less startup control.

Key Features

Feature	Design Value
Sensorless Overcurrent Protection	Monitors output current via LS MOSFET R_DS(ON) voltage drop at PHASE pin - eliminates sense resistor, saving cost, space, and conduction losses.
Low-Side-Less Startup (LSLess)	Disables LS driver until HS begins switching - prevents negative output voltage spikes when starting into pre-charged loads, improving system reliability.
FB Disconnection Protection	100 nA internal current source pulls FB high if open - forces COMP low and shuts down PWM, preventing dangerous overvoltage conditions.
Adaptive Dead-Time Control	Dynamically adjusts HS/LS turn-on timing by sensing PHASE and LGATE transitions - minimizes body diode conduction, boosting efficiency without Schottky diodes.
Programmable Soft-Start	10 µA current sourced from COMP pin charges external RC network - enables adjustable output voltage ramp time to limit inrush current and stress on input capacitors.

Applications

Memory and Termination Supply

CPU Core Power Supply

Use Scenario: Providing tightly regulated 1.2 V or 1.5 V to DDR memory modules and termination networks in server and workstation motherboards.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing transient response, current limiting, and thermal stability for memory rail.

Use Value: ±1% output accuracy and 270 kHz switching ensure stable voltage under fast load steps; R_DS(ON) sensing avoids added loss from sense resistors.

Use Scenario: Delivering scalable core voltage (e.g., 0.8–1.3 V) to multi-core CPUs requiring dynamic voltage scaling and fast transient response.

IC Role / Device Role / Timing Role: Step-down controller with integrated drivers enabling compact VRM implementation and precise V_OUT regulation.

Use Value: 0.8 V internal reference and transconductance amplifier support sub-1 V outputs; LSLess startup prevents damage during hot-plug or reset events.

Subsystem Power (MCH/IOCH)

Distributed DC/DC Conversion

Use Scenario: Generating dedicated 3.3 V or 5 V rails for memory controller hubs (MCH), I/O controller hubs (IOCH), and PCI Express interface circuitry.

IC Role / Device Role / Timing Role: Standalone buck controller delivering isolated, noise-immune power with independent enable/disable and fault management.

Use Value: SO-8 footprint and integrated drivers reduce solution size; disable function allows coordinated power sequencing with chipset control signals.

Use Scenario: Local point-of-load (POL) conversion in telecom and industrial systems where 12 V or 5 V intermediate buses feed multiple downstream rails.

IC Role / Device Role / Timing Role: Flexible buck controller supporting inputs as low as 1.5 V - suitable for cascaded or battery-backed intermediate bus architectures.

Use Value: Wide V_CC range (4.1–13.2 V) and 1.5 V min VIN enable direct use of common system rails; UVLO and latch-off OCP enhance system-level robustness.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6260CRZ	Fixed 300 kHz frequency; requires external bootstrap diode; no LSLess feature; 0.6 V reference.	Lacks low-side-less startup and FB disconnection protection - less robust in hot-swap or floating-FB scenarios.	Preferred where higher switching frequency justifies added component count and reduced protection coverage.
TPS54620RGYR	Integrated FETs (not controller-only); 2.95–17 V input; 600 kHz; 0.8% accuracy; no R_DS(ON) OCP.	Monolithic converter vs. controller - eliminates external MOSFET selection but limits power scalability and thermal partitioning.	Chosen for lower design complexity and smaller total solution size where <10 A output is sufficient.

Compared with ISL6260CRZ and TPS54620RGYR, the L6726A offers unique advantages in system-level safety (FB disconnect protection, LSLess), flexibility (1.5 V min VIN, 5–12 V V_CC), and cost-sensitive high-current designs via R_DS(ON) sensing - making it optimal for industrial and embedded subsystem power where reliability and BOM optimization are critical.

Availability

L6726A is available at Aetrix Electronics and suitable for CPU core power supply, memory termination, subsystem power (MCH/IOCH), and distributed DC/DC conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6726A 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, analog ICs, and automotive-grade components.

The L6726A belongs to ST's high-integration PWM controller product line, engineered specifically for efficient, compact, and robust synchronous buck conversion in computing, communications, and industrial embedded power systems.

FAQ

What is the minimum input voltage supported by the L6726A for power conversion?

The L6726A supports power conversion input as low as 1.5 V, as confirmed in the device summary and electrical characteristics table. This capability enables use in low-voltage intermediate bus architectures and post-regulated applications where traditional controllers require higher minimum VIN. The 1.5 V specification applies under recommended operating conditions with V_CC > 7.0 V.

How does the L6726A implement overcurrent protection without a sense resistor?

The L6726A senses output current by measuring the voltage drop across the low-side MOSFET's R_DS(ON) using the PHASE pin. During LS conduction, the voltage between PHASE and GND is compared to a programmable threshold (50–550 mV) set by an ROCSET resistor on the LGATE/OC pin. This eliminates the need for a discrete current-sense resistor, reducing cost, board area, and conduction losses.

Can the L6726A be used with a 5 V V_CC supply while driving high-side MOSFETs?

Yes - the L6726A operates with V_CC from 4.1 V to 13.2 V, and its high-side driver uses BOOT pin bootstrapping (not V_CC) to generate gate voltage above the PHASE node. With a 5 V V_CC, the LS driver functions normally, and the HS driver relies on the bootstrap capacitor charged from V_CC to deliver sufficient gate drive for standard N-channel MOSFETs in buck topologies.

What happens if the FB pin becomes disconnected during operation?

If the FB pin disconnects, the L6726A's internal 100 nA current source pulls the pin high, forcing the error amplifier output (COMP) low and disabling PWM output. This latches the HS and LS drivers off, preventing uncontrolled output voltage rise and protecting downstream loads - a documented safety feature called "FB disconnection protection" in Section 7.2 of the datasheet.

L6726A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.1V ~ 13.2V

Frequency - Switching:: 270kHz

Duty Cycle (Max):: 80%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

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

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

L6726A FAQ

1.How can I place an order for L6726A through Aetrix?

Please submit a Request for Quotation (RFQ) for L6726A 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 L6726A reliable?

The price and inventory of L6726A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6726A is usually 5 days.

3.What payment methods are accepted for L6726A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6726A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6726A?

L6726A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6726A 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 L6726A?

For technical support, including L6726A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6726A requirements.

6.How does Aetrix verify that L6726A is sourced from the original manufacturer or authorized distributors?

All L6726A 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 L6726A meets industry standards.

7.What is the process for return or replacement of L6726A?

All L6726A units undergo pre-shipment inspection (PSI). If there is an issue with L6726A, 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 L6726A part is unused and in its original packaging.

Return procedure for L6726A:

1.Submit a request within 90 days.

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

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