Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics L6726ATR

Name: L6726ATR
Brand: STMicroelectronics
SKU: L6726ATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L6726ATR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

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

Datasheet:: L6726ATR.pdf

Description:: IC REG CTRLR BUCK 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,589

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L6726ATR from STMicroelectronics is a single-phase synchronous buck PWM controller with integrated high-current gate drivers, designed for DC-DC step-down conversion in subsystem and CPU power supplies. It operates with input voltage as low as 1.5 V, delivers ±1% output voltage accuracy via a 0.8 V internal reference, features fixed 270 kHz switching frequency, and supports programmable overcurrent protection using low-side MOSFET R_DS(on) sensing - eliminating external sense resistors.

For engineers reviewing the L6726ATR datasheet, L6726ATR pinout, L6726ATR application, or L6726ATR equivalent, key selection considerations include its SO-8 package, transconductance error amplifier architecture, bootstrap-based high-side drive, adaptive dead-time control, and FB disconnection protection for safe open-loop operation.

Technical Context

The L6726ATR implements a transconductance error amplifier with 5 mS typical transconductance and 70 dB open-loop gain, enabling stable loop compensation via external R_F-C_F//C_P network on the COMP pin. Its oscillator is internally fixed at 270 kHz (±10% over temperature), supporting predictable timing and EMI control without external components.

Overcurrent protection uses real-time sensing of the PHASE-to-GND voltage during low-side conduction, comparing it against a user-programmable threshold (50–550 mV) set by an ROCSET resistor on LGATE/OC. Protection triggers after two consecutive OCP events and latches until VCC cycle, while FB disconnection protection sources 100 nA from FB to clamp output if feedback is floating.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Synchronous buck (N-channel HS/LS MOSFET driver)
Switching frequency	270 kHz fixed - enables consistent filter design and EMI filtering without timing component variation
Output voltage accuracy	±1% over line/load/temperature (0°C to +70°C) - ensures tight regulation for CPU/memory rails
Reference voltage	0.8 V internal - allows direct 0.8 V output or scalable higher voltages via resistor divider
Driver capability	1.5 A source / 1.5 A sink per gate - drives multiple parallel MOSFETs or high-Q devices without external buffers
OCP method	Sensorless R_DS(on) sensing on LS FET - eliminates sense resistor cost, board space, and conduction loss
Soft-start current	10 µA sourced from COMP/DIS pin - linearly charges external compensation caps to control ramp rate
UVLO threshold	4.1 V turn-on with 0.2 V hysteresis - prevents erratic startup during brown-out conditions

Pinout & Package

Package: SO-8 (Small Outline, 8-pin, surface-mount, 1.27 mm pitch). Thermal resistance R_thJA = 85 °C/W on 2S2P PCB in free air.

Pin/Terminal	Circuit Role	Design Meaning
BOOT	HS driver bootstrap supply	Connects via 100 nF capacitor to PHASE node; supplies floating gate drive for high-side N-MOSFET
UGATE	High-side gate driver output	Drives gate of upper N-MOSFET; rated for 1.5 A source/sink with 1.1 Ω pull-down resistance
GND	Power and signal reference	Common return for all internal circuits, drivers, and error amplifier; must connect to low-impedance PCB ground plane
LGATE / OC	Low-side gate output & OCP programming	Drives lower N-MOSFET gate (1.5 A); also sources 10 µA to set OCP threshold via ROCSET resistor to GND
VCC	IC and LS driver supply	Operates from 4.1 V to 13.2 V; powers internal logic, error amp, and low-side driver; requires ≥1 µF MLCC decoupling
FB	Error amplifier inverting input	Monitors regulated output via resistor divider; 100 nA bias current enables FB disconnection protection
COMP / DIS	Compensation node & disable input	External RC network sets loop stability; pulled below 0.4 V to disable PWM and halt both gate outputs
PHASE	HS return path & current sense node	Connects to LS drain; used for R_DS(on) current sensing, adaptive dead-time detection, and LSLess startup control

Key Features

Feature	Design Value
Adaptive dead-time control	Monitors PHASE and LGATE edges to minimize shoot-through and body-diode conduction - improves efficiency without Schottky diodes
Low-side-less (LSLess) startup	Disables LS driver until HS begins switching - prevents negative output spikes when starting into pre-charged loads
Programmable OCP threshold	50–550 mV range set by single ROCSET resistor - enables precise current limiting without calibration or trimming
FB disconnection protection	100 nA internal FB bias current pulls COMP low if FB floats - avoids uncontrolled overvoltage and load damage
Transconductance error amplifier	5 mS gm, 70 dB open-loop gain - provides robust phase margin with standard Type II/III compensation networks
Bootstrap-based HS drive	Self-contained floating supply via BOOT capacitor - eliminates need for isolated auxiliary supply or charge pump

Applications

Subsystem Power Supply

Memory Termination Supply

Use Scenario: Powering MCH, IOCH, or PCI Express interface circuitry in embedded computing platforms.

IC Role / Device Role / Timing Role: Primary step-down controller managing 1.0–3.3 V rail generation with fast transient response.

Use Value: ±1% output accuracy and 270 kHz fixed frequency ensure stable bus signaling and compatibility with standard filter inductors/capacitors.

Use Scenario: Delivering tightly regulated 1.25 V or 1.5 V termination voltage for DDR2/DDR3 memory modules.

IC Role / Device Role / Timing Role: Synchronous buck controller with low-noise regulation and OCP for fault-tolerant memory interface power.

Use Value: Sensorless R_DS(on) OCP avoids sense resistor losses - critical for high-efficiency, low-voltage termination rails.

CPU Core Supply

Distributed DC/DC Converter

Use Scenario: Generating core voltage (e.g., 0.8–1.3 V) for low-power DSPs or microcontrollers in industrial controllers.

IC Role / Device Role / Timing Role: Single-phase PWM controller with 0.8 V reference and programmable soft-start for controlled core ramp-up.

Use Value: LSLess startup prevents negative voltage excursions during cold boot into pre-biased systems - protects sensitive core logic.

Use Scenario: Local point-of-load (POL) conversion in telecom or networking equipment with distributed 5 V or 12 V backplanes.

IC Role / Device Role / Timing Role: Compact SO-8 controller enabling minimal-footprint, high-density DC/DC stages near ASICs/FPGAs.

Use Value: Integrated 1.5 A drivers and fixed-frequency operation reduce BOM count and layout complexity versus discrete driver solutions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2238DJ-LF-Z (Monolithic Power Systems)	4.5–18 V input, 500 kHz switching, integrated MOSFETs (not controller-only); no R_DS(on) OCP	Targeted for space-constrained designs where full integration is preferred over external FET flexibility	Select MP2238 when board area is critical and ≤3 A output suffices; avoid if R_DS(on) OCP or external FET optimization is required
RT8802AGQW (Richtek)	SO-8, 270 kHz, 0.8 V ref, but uses external current-sense resistor (not R_DS(on)) and lacks LSLess startup	Suitable for legacy designs requiring resistor-based OCP calibration and simpler startup behavior	Select RT8802A only if existing layout uses sense resistors and FB disconnection protection is not mandatory

Compared with MP2238DJ-LF-Z and RT8802AGQW, the L6726ATR uniquely combines R_DS(on)-based OCP, LSLess startup, and FB disconnection protection in a controller-only SO-8 package - making it optimal for flexible, high-reliability POL designs where external FET selection and fault resilience are priorities.

Availability

L6726ATR is available at Aetrix Electronics and suitable for CPU core supplies, memory termination rails, and subsystem power distribution requiring stable component supply, long-term lifecycle support, and SO-8 footprint compatibility.

Supply support for L6726ATR 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 consumer applications.

The L6726ATR belongs to ST's high-efficiency DC-DC controller product line, engineered specifically for compact, cost-sensitive synchronous buck converters in computing and communications infrastructure where reliability, integration, and protection features are critical.

FAQ

What is the minimum input voltage supported by the L6726ATR for power conversion?

The L6726ATR supports power conversion input down to 1.5 V, enabled by its ability to regulate from low VIN while maintaining stable gate drive via the bootstrap circuit. This allows use in intermediate bus architectures such as 1.8 V or 2.5 V pre-regulated rails feeding downstream POL stages, provided VCC remains within 4.1–13.2 V.

How does the L6726ATR implement overcurrent protection without a sense resistor?

The L6726ATR senses current by measuring the voltage drop across the low-side MOSFET's R_DS(on) during conduction using the PHASE pin. An internally held threshold (programmed via ROCSET on LGATE/OC) is compared to this voltage; exceeding it for two consecutive cycles triggers latched shutdown - eliminating external sense resistors and their associated power loss and board area.

Can the L6726ATR operate with a 5 V VCC supply while converting from a 1.5 V input?

Yes - the device separates VCC (4.1–13.2 V) and VIN (as low as 1.5 V) domains. VCC powers internal logic and drivers, while VIN feeds the power stage. With VCC = 5 V, the controller fully functions, and the 270 kHz oscillator, 0.8 V reference, and gate drivers remain operational, enabling step-down from 1.5 V input when duty cycle constraints allow (D = VOUT/VIN).

What happens if the FB pin is left unconnected on the L6726ATR?

If FB is disconnected, the L6726ATR's internal 100 nA current source pulls the pin high, forcing the error amplifier to drive COMP low - disabling PWM output and holding both UGATE and LGATE off. This failsafe behavior prevents uncontrolled output voltage rise and protects downstream loads, a feature confirmed in Section 7.2 of the official datasheet.

L6726ATR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

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

L6726ATR FAQ

1.How can I place an order for L6726ATR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6726ATR 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 L6726ATR reliable?

The price and inventory of L6726ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6726ATR is usually 5 days.

3.What payment methods are accepted for L6726ATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6726ATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6726ATR?

L6726ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6726ATR 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 L6726ATR?

For technical support, including L6726ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6726ATR requirements.

6.How does Aetrix verify that L6726ATR is sourced from the original manufacturer or authorized distributors?

All L6726ATR 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 L6726ATR meets industry standards.

7.What is the process for return or replacement of L6726ATR?

All L6726ATR units undergo pre-shipment inspection (PSI). If there is an issue with L6726ATR, 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 L6726ATR part is unused and in its original packaging.

Return procedure for L6726ATR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…