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 E-L6910ATR

Name: E-L6910ATR
Brand: STMicroelectronics
SKU: E-L6910ATR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: E-L6910ATR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 16-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: E-L6910ATR.pdf

Description:: IC REG CTRLR BUCK 16HTSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,008

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

Product details

Overview

L6910ATR from STMicroelectronics is a voltage-mode PWM synchronous buck controller IC designed for high-performance DC-DC conversion from 5V–12V input buses. It delivers adjustable output down to 0.9V ±1.5%, supports 0–100% duty cycle, integrates 1.3A high-side and 1.1A low-side gate drivers, and features hiccup-mode overcurrent protection and power-good signaling - used in memory supply and add-on card power rails.

For engineers reviewing the L6910ATR datasheet, L6910ATR pinout, L6910ATR application, or L6910ATR equivalent, key selection criteria include its 200kHz–1MHz externally adjustable oscillator, internal 0.9V reference with 1nF bypass requirement, VFB-based overvoltage trip at 120% of setpoint, and HTSSOP16 package with exposed thermal pad for high-current DC-DC designs.

Technical Context

The L6910ATR implements voltage-mode PWM control with a 10MHz gain-bandwidth error amplifier and 10V/µs slew rate to enable fast load transient response. Its oscillator allows frequency tuning via RT resistor (50kHz–1MHz), and it uses R_DS(on) sensing on the high-side MOSFET for current-limit detection without external shunt resistors.

Protection logic includes overvoltage crowbar action (activating LGATE during OVP), hiccup-mode overcurrent recovery (discharging SS capacitor at 10µA), and EAREF-driven shutdown below 650mV. The device operates across –40°C to +150°C junction temperature and requires separate PGND and signal GND connections to minimize noise coupling.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	5V to 12V - powers controller directly from intermediate bus; must not exceed VCC rating
Output Voltage Accuracy	0.9V ±1.5% - enables precise low-voltage regulation for DDR memory and ASIC cores
Switching Frequency	200kHz fixed or 50kHz–1MHz adjustable via RT - balances efficiency, size, and EMI in compact layouts
Gate Drive Current	1.3A high-side source / 1.1A low-side source - drives N-channel MOSFETs with low R_DS(on) and fast switching
Overvoltage Trip	120% of V_REF on FB/EAREF - triggers immediate LGATE activation to clamp output
Soft-Start Control	10µA constant-current charge of external capacitor - prevents inrush current and ensures monotonic startup
Thermal Resistance	50°C/W (HTSSOP16, exposed pad) - enables >1W dissipation with minimal board copper

Pinout & Package

Package: HTSSOP16 (exposed thermal pad), 5mm × 4.4mm × 1.2mm, pitch 0.65mm - optimized for thermal performance in high-current buck regulators.

Pin/Terminal	Circuit Role	Design Meaning
VREF	Internal reference output	0.9V ±1.5% source requiring ≥1nF ceramic bypass; forces hiccup mode if pulled below 0.63V
OSC	Oscillator frequency control	1.23V-biased node; RT-to-GND raises f_SW, RT-to-VCC lowers it; 50µA forced current halts switching
OCSET	Overcurrent threshold setting	Sinks 200µA to external resistor; sets current limit via R_DS(on) of high-side MOSFET
SS/INH	Soft-start timing & disable input	10µA charging current; <0.4V disables operation and discharges SS cap
COMP	Error amplifier output	Compensation node for voltage-loop stability; connects to RC network for bandwidth/phase margin control
FB	Feedback input	Inverting input of error amp; monitors output via resistor divider; determines PGOOD and OVP thresholds
EAREF	Error amp non-inverting input	Accepts 0.9–3.0V external reference or shorted to VREF; shuts down if <650mV
PGOOD	Open-collector status output	Pulled low when V_OUT deviates >10% from setpoint; requires external pull-up
PHASE	High-side MOSFET source node	Return path for HGATE driver; used with OCSET for R_DS(on)-based current sensing
HGATE	High-side gate driver output	Bootstrap-supplied output driving upper N-MOS; peak 1.3A source capability
BOOT	Bootstrap supply input	Connects to PHASE via capacitor and to VCC via diode; supplies HGATE driver during high-side conduction
PGND	Power ground	Low-impedance return for LGATE and power stage; must tie closely to low-side MOSFET source
LGATE	Low-side gate driver output	Directly VCC-supplied output driving lower N-MOS; peak 1.1A source capability
VCC	Controller supply input	5–12V operating range; turn-on threshold 4.3V typical; must be ≥ VIN for safe operation
N.C.	No-connect terminal	Not internally bonded; may float or connect to GND for mechanical stability

Key Features

Feature	Design Value
Adjustable 0–100% duty cycle	Enables full-range output regulation including 0V start-up and 100% conduction for ultra-low dropout
Voltage-mode PWM with 10MHz GBW	Supports wide bandwidth compensation for sub-µs load transient recovery in point-of-load converters
R_DS(on)-based overcurrent sensing	Eliminates current-sense resistor, reducing BOM count and PCB area while maintaining accuracy
Hiccup-mode fault recovery	Automatically retries after overcurrent without full power-cycle reset - improves system reliability
Adaptive dead-time control	Prevents shoot-through by sequencing HGATE/LGATE turn-on based on PHASE and BOOT voltages

Applications

Memory Power Supply

PCI Add-on Card Rail

Use Scenario: Providing stable 1.2V/1.5V/1.8V to DDR2/DDR3 memory modules on server motherboards.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing feedback loop, gate drive, and OVP/OCP protection.

Use Value: Tight 0.9V ±1.5% reference and fast transient response maintain memory VDD within JEDEC spec under burst loads.

Use Scenario: Generating 3.3V or 5V auxiliary power for PCIe expansion cards with variable load profiles.

IC Role / Device Role / Timing Role: Standalone step-down controller interfacing with host-supplied 12V bus and local output filter.

Use Value: Adjustable 50kHz–1MHz switching allows EMI tuning to avoid PCIe reference clock harmonics.

Distributed DC-DC Converter

Mag-Amp Replacement

Use Scenario: Local regulation on backplane-fed boards where centralized 5V/12V is distributed to multiple point-of-load sites.

IC Role / Device Role / Timing Role: High-efficiency buck controller replacing linear regulators or discrete FET+driver solutions.

Use Value: Integrated 1.3A gate drivers reduce external component count and improve layout repeatability.

Use Scenario: Replacing magnetic amplifiers in telecom rectifier modules to simplify secondary-side regulation.

IC Role / Device Role / Timing Role: Synchronous rectification controller eliminating mag-amp core losses and enabling digital control.

Use Value: 0–100% duty cycle and VFB-based OVP allow precise output clamping without auxiliary windings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2307DN-LF-Z	Integrated MOSFETs (30V/3A), fixed 500kHz f_SW, no R_DS(on) current sense	Lower power (≤3A), simpler layout; lacks adjustable frequency and hiccup-mode OCP	Select for cost-sensitive ≤3A applications where integrated FETs reduce footprint
LM5116PW	Current-mode control, 50–750kHz range, external high-side driver only, no integrated LGATE	Higher Vin (6–100V), supports higher power; requires dual external drivers and more compensation components	Select for wide-input industrial supplies needing robust current-mode loop stability

Compared with MP2307DN-LF-Z and LM5116PW, the L6910ATR uniquely combines R_DS(on)-based OCP, hiccup recovery, and dual integrated gate drivers in HTSSOP16 - making it optimal for mid-power (5–20A) 5V–12V bus applications demanding reliability and layout simplicity.

Availability

L6910ATR is available at Aetrix Electronics and suitable for memory power supply, PCI add-on card rail, and distributed DC-DC converter applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6910ATR 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 markets.

The L6910A belongs to ST's high-performance DC-DC controller product line, engineered specifically for synchronous buck topologies in computing and communications infrastructure where precision regulation, fast transients, and robust protection are critical.

FAQ

What is the minimum output voltage achievable with the L6910ATR?

The L6910ATR achieves a minimum regulated output voltage of 0.9V ±1.5% using its internal reference. When EAREF is tied to VREF, this 0.9V reference sets the lower bound of the feedback divider ratio. External references down to 0.9V may also be applied to EAREF, but the device will not regulate below 0.9V due to internal architecture limits and reference tolerance.

How does the L6910ATR implement overcurrent protection without a sense resistor?

The L6910ATR senses overcurrent by measuring the voltage drop across the R_DS(on) of the high-side MOSFET using the OCSET and PHASE pins. An internal 200µA current source flows through an external resistor (ROCS) connected between OCSET and the MOSFET drain. When the R_DS(on) × I_LOAD voltage exceeds the ROCS × 200µA threshold, the controller triggers hiccup-mode protection.

Can the L6910ATR operate with a 3.3V input bus?

No - the L6910ATR requires a minimum VCC supply of 4.3V (typical turn-on threshold) and specifies an operational range of 5V to 12V. Applying 3.3V to VCC will prevent startup and cause continuous undervoltage lockout. For 3.3V input applications, a different controller with lower VCC rating (e.g., TPS54331) must be selected.

What is the purpose of the exposed pad on the HTSSOP16 package?

The exposed thermal pad on the L6910ATR's HTSSOP16 package provides a low-thermal-resistance path (50°C/W) from the die to the PCB. It must be soldered to a dedicated copper pour connected to PGND to dissipate heat from gate drivers and internal circuitry. Leaving it unconnected degrades thermal performance and risks thermal shutdown under sustained 1.3A gate drive loads.

E-L6910ATR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-PowerTSSOP (0.173", 4.40mm 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):: 5V ~ 12V

Frequency - Switching:: 200kHz

Duty Cycle (Max):: 100%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Current Limit, Frequency Control, Phase Control, Power Good, Soft Start

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-HTSSOP

E-L6910ATR FAQ

1.How can I place an order for E-L6910ATR through Aetrix?

Please submit a Request for Quotation (RFQ) for E-L6910ATR 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 E-L6910ATR reliable?

The price and inventory of E-L6910ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L6910ATR is usually 5 days.

3.What payment methods are accepted for E-L6910ATR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L6910ATR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-L6910ATR?

E-L6910ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-L6910ATR 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 E-L6910ATR?

For technical support, including E-L6910ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L6910ATR requirements.

6.How does Aetrix verify that E-L6910ATR is sourced from the original manufacturer or authorized distributors?

All E-L6910ATR 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 E-L6910ATR meets industry standards.

7.What is the process for return or replacement of E-L6910ATR?

All E-L6910ATR units undergo pre-shipment inspection (PSI). If there is an issue with E-L6910ATR, 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 E-L6910ATR part is unused and in its original packaging.

Return procedure for E-L6910ATR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

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…