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

STMicroelectronics L6910TR

Name: L6910TR
Brand: STMicroelectronics
SKU: L6910TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6910TR

Manufacturer:: STMicroelectronics

Category:: DC DC Switching Controllers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: L6910TR.pdf

Description:: IC REG CTRLR BUCK 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6910TR 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 L6910TR datasheet, L6910TR pinout, L6910TR application, or L6910TR equivalent, key selection criteria include its 200kHz–1MHz externally adjustable oscillator, internal 0.9V reference with ±1.5% tolerance, VCC operating range (5–12V), synchronous rectification support, and SO-16 package compatibility with industrial and computing power designs.

Technical Context

The L6910TR implements voltage-mode PWM control with a 10MHz gain-bandwidth error amplifier and 10V/µs slew rate, enabling fast load transient response without external compensation complexity. Its adaptive dead-time control prevents shoot-through in synchronous buck topologies by monitoring PHASE and LGATE voltages before enabling complementary switching.

Overvoltage protection activates when FB exceeds 120% of EAREF, forcing OSC >3V and turning on the low-side MOSFET as a crowbar; overcurrent detection uses R_DS(on) sensing via OCSET with 200µA current source, eliminating discrete sense resistors. Soft-start is programmable via external capacitor on SS/INH with dual-stage 35µA/10µA charging.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REF	0.9V ±1.5% internal reference - enables precise output regulation without external reference; requires ≥1nF bypass capacitor.
f_SW	200kHz fixed or 50kHz–1MHz adjustable via RT resistor - sets converter size, efficiency, and EMI profile.
I_HGATE	1.3A peak high-side source current - drives N-channel MOSFET gates with fast turn-on for <3µH inductors.
I_LGATE	1.1A peak low-side source current - sustains synchronous rectification at up to 20A output with low R_DS(on) FETs.
Duty Cycle	0% to 100% - supports ultra-low-V_OUT (e.g., 0.9V) and high-input-to-output ratios (e.g., 12V→0.9V).
OVP Threshold	120% of EAREF - triggers crowbar action by forcing LGATE high while disabling HGATE during overvoltage events.
PGOOD Window	±10% (88–112% of EAREF) - provides system-level power sequencing and fault reporting with 2% hysteresis.

Pinout & Package

Package: SO-16 narrow body (JEDEC MS-012), RoHS-compliant, surface-mount, thermal resistance R_{th j-amb} = 120°C/W on 1-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
VREF	Internal reference output	Provides stable 0.9V ±1.5% reference; must be decoupled with ≥1nF capacitor to prevent instability.
OSC	Oscillator frequency control	Accepts RT resistor to GND (↑f_SW) or VCC (↓f_SW); 1.23V fixed bias; sinking 50µA halts switching.
OCSET	Overcurrent threshold setting	200µA current sink sets I_OC via R_{OCSET; monitors upper MOSFET R_DS(on) voltage drop.}
SS/INH	Soft-start timing / enable control	10µA constant-current charge for soft-start; <0.4V disables device; also resets during UVLO.
COMP	Error amplifier output	Drives external compensation network (R/C) to stabilize voltage-mode loop with 70–85dB open-loop gain.
FB	Feedback input	Inverting input of error amp; senses 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; <650mV shuts down regulator.
PGOOD	Open-drain status output	Pulled low if V_OUT outside 88–112% of EAREF; requires external pull-up for system monitoring.
PHASE	High-side switch node return	Source connection for upper MOSFET; supplies bootstrap circuit and enables R_DS(on)-based current sensing.
HGATE	High-side gate driver output	Drives N-MOS gate with 1.3A peak source/sink; bootstrapped from BOOT–PHASE rail.
BOOT	Bootstrap supply input	Connects via capacitor to PHASE and diode to VCC; generates floating supply for HGATE driver.
PGND	Power ground return	Low-impedance path for low-side MOSFET source; must be routed close to LGATE to minimize noise coupling.
LGATE	Low-side gate driver output	Directly driven from VCC; 1.1A source/1.3A sink capability; adaptive dead-time prevents cross-conduction.
VCC	Controller supply input	5–12V operation only; VIN must not exceed VCC; internal UVLO turns on at 4.3V (typ), off at 4.1V (typ).
N.C.	No-connect terminal	Not internally bonded; may be left floating or tied to GND for mechanical stability.

Key Features

Feature	Design Value
Synchronous rectification control	Integrated dual gate drivers with adaptive dead-time eliminate external logic and reduce conduction losses in buck stage.
R_DS(on)-based current sensing	Removes need for lossy shunt resistor; OCSET pin sinks 200µA to set trip point using upper FET's on-resistance.
Hiccup-mode overcurrent recovery	Discharges SS capacitor at 10µA upon fault; restarts soft-start after removal of overload - no manual reset required.
Adjustable 0–100% duty cycle	Enables direct 12V→0.9V conversion without external biasing; supports wide input/output ratios in single-stage design.
Fast transient response architecture	10MHz GBW and 10V/µs slew-rate error amplifier allow >100kHz closed-loop bandwidth for sub-10µs load step recovery.

Applications

Memory Power Supply

PCI Add-on Card Rail

Use Scenario: Providing tightly regulated 1.2V/1.5V/1.8V to DDR SDRAM, SRAM, and flash memory on server motherboards.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 10A with <1% output deviation.

Use Value: Internal 0.9V reference ±1.5% tolerance and 100% duty cycle enable accurate low-V_OUT generation without trimming.

Use Scenario: Generating 3.3V or 5V auxiliary rails for PCIe expansion cards with strict power sequencing requirements.

IC Role / Device Role / Timing Role: Standalone DC-DC controller delivering PGOOD signal for BIOS handshaking and hot-plug coordination.

Use Value: Programmable soft-start and hiccup-mode protection ensure reliable power-up under variable capacitive loads.

Distributed Low-Voltage DC-DC

Mag-Amp Replacement

Use Scenario: Local point-of-load conversion on dense PCBs where space limits use of integrated DC-DC modules.

IC Role / Device Role / Timing Role: Controller driving discrete MOSFETs to achieve >90% efficiency at 10–20A loads with minimal footprint.

Use Value: SO-16 package and bootstrap gate drive simplify layout versus multi-chip solutions requiring isolated bias supplies.

Use Scenario: Replacing magnetic amplifiers in telecom half-brick converters to reduce size, weight, and component count.

IC Role / Device Role / Timing Role: Voltage-mode PWM controller replacing analog mag-amp feedback with digital-traceable regulation.

Use Value: 200kHz–1MHz frequency adjustability allows optimization for ferrite core losses and EMI filter size.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS40210DRCT	Current-mode control; 4.5–20V VCC range; no internal reference; requires external 0.6V ref.	Lacks integrated 0.9V reference and hiccup-mode OCP; better suited for wide-input industrial supplies.	Select when higher input voltage (>12V) or current-mode loop stability is prioritized over reference accuracy.
ISL6208CRZ	Voltage-mode like L6910TR; 5–24V VCC; 1.2V internal ref; no adjustable oscillator; SOIC-16 package.	Fixed 300kHz oscillator; lacks RT-based frequency tuning and PGOOD hysteresis configuration.	Choose for simpler designs needing fixed-frequency operation and lower BOM count, but sacrificing flexibility.

Compared with TPS40210DRCT and ISL6208CRZ, the L6910TR uniquely combines ±1.5% internal 0.9V reference, 50kHz–1MHz oscillator adjustability, and R_DS(on)-based overcurrent sensing - making it optimal for compact, precision low-voltage computing power rails where reference drift and layout area are critical.

Availability

L6910TR is available at Aetrix Electronics and suitable for memory power supply, PCI add-on card rail, and distributed low-voltage DC-DC applications requiring stable component supply, long-term lifecycle support, and SO-16 package compatibility.

Supply support for L6910TR 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 automotive, industrial, and computing markets.

The L6910TR belongs to ST's high-performance DC-DC controller product line, engineered specifically for synchronous buck conversion in space-constrained computing and communications equipment demanding precision regulation and robust fault handling.

FAQ

What is the minimum output voltage achievable with the L6910TR?

The L6910TR supports an adjustable output voltage down to 0.9V ±1.5% when using its internal reference (EAREF tied to VREF). With an external reference as low as 0.9V applied to EAREF, the same minimum output applies. Output voltages below 0.9V are not supported due to reference and error amplifier limitations.

Can the L6910TR drive both high-side and low-side N-channel MOSFETs simultaneously?

Yes - the L6910TR integrates independent high-side (HGATE) and low-side (LGATE) gate drivers optimized for synchronous N-MOS buck topologies. Adaptive dead-time control prevents shoot-through by delaying turn-on based on PHASE and LGATE voltage thresholds, ensuring safe commutation.

How does overvoltage protection operate in the L6910TR?

When FB voltage exceeds 120% of EAREF, the L6910TR forces OSC pin above 3V and immediately turns on LGATE while disabling HGATE. This creates a crowbar path through the low-side MOSFET to clamp output voltage - active until FB falls below the 112% release threshold.

Is an external bootstrap diode required for the L6910TR's high-side driver?

Yes - the BOOT pin requires an external diode (cathode to BOOT, anode to VCC) and a ceramic capacitor (typically 100nF) between BOOT and PHASE. This forms the floating supply for the high-side driver; omitting the diode risks insufficient gate drive and potential HGATE failure during startup.

L6910TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-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):: 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-SO

L6910TR FAQ

1.How can I place an order for L6910TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6910TR 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 L6910TR reliable?

The price and inventory of L6910TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6910TR is usually 5 days.

3.What payment methods are accepted for L6910TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6910TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6910TR?

L6910TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6910TR 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 L6910TR?

For technical support, including L6910TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6910TR requirements.

6.How does Aetrix verify that L6910TR is sourced from the original manufacturer or authorized distributors?

All L6910TR 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 L6910TR meets industry standards.

7.What is the process for return or replacement of L6910TR?

All L6910TR units undergo pre-shipment inspection (PSI). If there is an issue with L6910TR, 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 L6910TR part is unused and in its original packaging.

Return procedure for L6910TR:

1.Submit a request within 90 days.

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

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