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Home Products Integrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching Regulators~~LMR34206FSC3RNXRQ1~~

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LMR34206FSC3RNXRQ1 - Texas Instruments

Name: Texas Instruments LMR34206FSC3RNXRQ1
Brand: Texas Instruments
SKU: LMR34206FSC3RNXRQ1
Price: 1.201 USD
Availability: InStock
Rating: 5 (5 reviews)

Manufacturer Part Number: LMR34206FSC3RNXRQ1

Manufacturer: Texas Instruments

Allelco Part Number: 32D-LMR34206FSC3RNXRQ1

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 27,877 pcs available, New & Original

Parts Description: POWER MANAGEMENT

Package: 12-VQFN-HR (3x2)

Data sheet: LMR34206FSC3RNX.pdf

PCN Assembly/Origin
Alt Assembly/Test Site 06/Oct/2021.pdf

HTML Datasheet
LMR34206-Q1 Datasheet.pdf

PCN Design/Specification
LMR34206-Q1/LMR34215-Q1 19/Oct/2019.pdf

RoHs Status: ROHS3 Compliant

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1+	$1.884	$1.88
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100+	$1.307	$130.70
500+	$1.233	$616.50
1000+	$1.201	$1,201.00

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Specifications

LMR34206FSC3RNXRQ1 Tech Specifications
Texas Instruments - LMR34206FSC3RNXRQ1 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LMR34206FSC3RNXRQ1

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
Voltage - Output (Min/Fixed)	3.3V
Voltage - Output (Max)	-
Voltage - Input (Min)	4.2V
Voltage - Input (Max)	42V
Topology	Buck
Synchronous Rectifier	Yes
Supplier Device Package	12-VQFN-HR (3x2)
Series	Automotive, AEC-Q100
Package / Case	12-VFQFN

Product Attribute	Attribute Value
Package	Tape & Reel (TR)
Output Type	Fixed
Output Configuration	Positive
Operating Temperature	-40°C ~ 125°C (TA)
Number of Outputs	1
Mounting Type	Surface Mount, Wettable Flank
Function	Step-Down
Frequency - Switching	2.1MHz
Current - Output	600mA
Base Product Number	LMR34206

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

LMR34206FSC3RNXRQ1 (1)

Manufacturer Part Number

LMR34206FSC3RNXRQ1

Manufacturer

Texas Instruments

Introduction

The LMR34206FSC3RNXRQ1 is a step-down (buck) regulator designed for automotive and industrial power supply applications.

Product Features and Performance

Step-down voltage regulator

Fixed 3.3V output voltage

High-efficiency synchronous rectification

1MHz switching frequency for smaller external components

Single output channel

Supports input voltage range from 4.2V to 42V

600mA output current capacity

Operates at a temperature range from -40°C to 125°C

AEC-Q100 qualified for automotive applications

Product Advantages

High input voltage range suitable for various applications

High-frequency operation allows for smaller passive components

Integrated synchronous rectification for improved efficiency

Wettable flanks package ensures good solderability and inspection capability

Designed for rugged automotive environments

Key Technical Parameters

Input Voltage (Min): 4.2V

Input Voltage (Max): 42V

Output Voltage (Min/Fixed): 3.3V

Output Current: 600mA

Switching Frequency: 2.1MHz

Temperature Operating Range: -40°C to 125°C

Mounting Type: Surface Mount

Package / Case: 12-VFQFN

Quality and Safety Features

Automotive-grade product with AEC-Q100 certification

Operates reliably in a wide temperature range

Compatibility

Compatible with surface mount technology (SMT) for PCB assembly

Suitable for standard 12-VFQFN footprint

Application Areas

Automotive electronics

Industrial power supplies

Battery-powered equipment

Embedded systems

Product Lifecycle

Status: Active

Ongoing availability with no near-term discontinuation

Replacements or upgrades can be sourced within Texas Instruments portfolio

Several Key Reasons to Choose This Product

Highly efficient power conversion reduces thermal footprint

Extended input voltage range makes it versatile for different environments

Robust against automotive temperature and stress conditions

High switching frequency optimizes size and efficiency of the power supply

Quality certification provides assurance for safety and longevity in applications

Easily integrated into designs with common surface mount package

Frequently Asked Questions(FAQ)

How does the LMR34206FSC3RNXRQ1 perform in high-input-voltage automotive applications, and what design considerations are necessary for stable operation above 24V?: The LMR34206FSC3RNXRQ1 supports input voltages up to 42V, making it suitable for automotive environments where transient spikes or battery voltage levels can exceed 24V. However, at higher input-to-output differentials, the efficiency drops due to increased conduction and switching losses. Engineers should ensure adequate thermal management by maintaining junction temperatures below 125°C under worst-case conditions. Additionally, output capacitor selection must account for increased ripple current demands at elevated duty cycles. Proper PCB layout with low-inductance grounding paths is critical to minimize noise coupling and maintain stability across the full operating range.

What is the impact of switching frequency on EMI and component size when using the LMR34206FSC3RNXRQ1 in compact automotive designs?: The LMR34206FSC3RNXRQ1 operates at a fixed 2.1MHz switching frequency, which places its emissions well above the AM radio band and reduces susceptibility to interference from lower-frequency sources. This high frequency allows use of smaller external components—particularly inductors and capacitors—due to reduced required inductance values. However, higher-frequency operation increases electromagnetic interference potential near sensitive analog circuits or communication lines. A well-designed layout with proper shielding and filtering is essential. The 2.1MHz frequency also minimizes audible noise, beneficial in interior vehicle electronics where acoustic comfort matters.

Can the LMR34206FSC3RNXRQ1 be used as a replacement for linear regulators in space-constrained automotive modules, and what trade-offs exist?: Yes, the LMR34206FSC3RNXRQQ1 replaces many linear regulators in automotive systems requiring 3.3V at up to 600mA. Unlike linear regulators, it achieves much higher efficiency—especially at large input-to-output differentials—by converting excess voltage into heat rather than dissipating it directly. While this improves thermal performance in hot ambient conditions, it requires careful evaluation of power dissipation during startup transients or fault scenarios. The synchronous rectification architecture reduces dropout voltage, but still demands sufficient input headroom (minimum 4.2V) for reliable regulation.

How does thermal performance compare between the standard 12-VQFN-HR package and alternative packages for the LMR34206FSC3RNXRQ1 in continuous 600mA loads?: The 12-VQFN-HR (3x2 mm) package offers excellent thermal conductivity through its exposed pad, enabling efficient heat transfer to the PCB. In continuous 600mA operation at 42V input and 3.3V output, power dissipation reaches approximately 23W, resulting in a junction temperature rise of over 80°C above ambient without heatsinking. With proper thermal vias and copper pours, the device can safely operate within specifications. Alternative packages would offer inferior thermal performance unless supplemented with additional cooling methods, making the QFN-HR ideal for compact, high-power-density automotive designs.

What external components are recommended for optimizing transient response in the LMR34206FSC3RNXRQ1 when powering digital ICs with fast load steps?: For optimal transient response, use low-ESR ceramic output capacitors such as X7R or X5R types rated for at least 10V. A typical configuration includes two parallel 22µF capacitors to handle peak current demands during sudden load transitions. Input capacitance should be minimized to avoid increasing input ripple; a single 10µF ceramic capacitor suffices. Inductor selection should prioritize low DC resistance (DCR) and saturation current exceeding 1A to prevent droop during large current steps. The controller’s internal compensation is tailored for this topology, so deviations may degrade phase margin and stability.

Is the LMR34206FSC3RNXRQ1 compatible with automotive functional safety requirements beyond basic AEC-Q100 qualification?: While the LMR34206FSC3RNXRQ1 meets AEC-Q100 Grade 2 (-40°C to +125°C) qualification, it does not inherently support ISO 26262 functional safety certification out of the box. Additional measures such as redundancy, watchdog monitoring, or system-level diagnostics must be implemented in the surrounding circuitry to achieve ASIL compliance. The device itself provides robust protection features like thermal shutdown and undervoltage lockout, which contribute to reliability but do not constitute a complete safety solution. Designers seeking functional safety must conduct fault injection testing and validate failure modes in context.

How does the LMR34206FSC3RNXRQ1 handle start-up behavior when powered from a pre-charged capacitor or reverse-polarity event?: The LMR34206FSC3RNXRQ1 employs an internal soft-start mechanism that limits inrush current during power-up, preventing excessive stress on input sources. If the input voltage ramps slowly or is already present, soft-start ensures gradual output buildup. However, if the input drops below 4.2V, the regulator enters shutdown mode and will not restart until voltage recovers above threshold. In reverse-polarity events, the integrated protection circuitry prevents damage only if polarity is reversed before application. External flyback diodes or protection ICs are recommended to guard against accidental reverse connection in harsh environments.

What are the key differences in efficiency curves between the LMR34206FSC3RNXRQ1 and competing buck converters like the LM3671 or TPS56339 when delivering 3.3V at 500mA?: At 500mA output and moderate input voltages (e.g., 12V), the LMR34206FSC3RNXRQ1 typically achieves 85–90% efficiency due to its synchronous rectification and optimized gate drive. In contrast, devices like the LM3671 (designed for ultra-low quiescent current) may reach similar peak efficiency but drop sharply at higher input voltages due to fixed frequency and lack of sync rectification. The TPS56339, while also synchronous, operates at lower frequencies (typically <2MHz), requiring larger passives and offering inferior transient response. The LMR34206FSC3RNXRQ1 excels in high-voltage automotive applications where efficiency degrades less severely with increasing Vin.

Can the LMR34206FSC3RNXRQ1 be operated in parallel for higher current applications, and what precautions are needed?: Parallel operation of the LMR34206FSC3RNXRQ1 is not recommended due to mismatched current sharing caused by slight variations in feedback thresholds and timing delays. Without active current balancing, one device may carry significantly more load, leading to localized heating and reduced reliability. Instead, consider using discrete solutions or dedicated multi-phase controllers. If higher current is required, evaluate TI’s higher-current variants such as the LMR33630 or external MOSFET-based designs with proper current sensing and control loops.

What layout guidelines are critical for minimizing radiated emissions from the LMR34206FSC3RNXRQ1 in EMC-sensitive automotive systems?: Minimize loop areas between input capacitors, inductor, and switch node. Place input and output capacitors as close as possible to the IC pins, with short, wide traces to reduce parasitic inductance. Use a solid ground plane and connect the exposed thermal pad directly to it via multiple vias. Route switching nodes away from sensitive analog traces or connectors. Keep feedback resistors near the FB pin and avoid routing them over split planes. These practices help contain high di/dt currents and suppress common-mode noise, facilitating compliance with CISPR 25 and other automotive EMI standards.

How does the LMR34206FSC3RNXRQ1 respond to load dump transients commonly encountered in automotive 12V/24V systems?: Load dump events can raise input voltage to over 40V for several hundred milliseconds. The LMR34206FSC3RNXRQ1 tolerates up to 42V, allowing it to survive such transients without damage. However, prolonged exposure at maximum voltage may stress internal protection circuits and degrade long-term reliability. Adding a TVS diode rated just above 42V (e.g., 45V) clamped at the input helps absorb energy and protect downstream components. Ensure the TVS has fast response time and sufficient pulse energy rating to handle real-world dump profiles per ISO 7637-2.

What is the significance of the wettable flank feature in the LMR34206FSC3RNXRQ1’s packaging for automated optical inspection (AOI) in high-volume manufacturing?: The wettable flank design allows solder paste to flow around the sides of the QFN package during reflow, enabling automated optical inspection systems to detect missing or insufficient solder joints by analyzing meniscus formation. This improves yield in high-speed assembly lines by catching defects early. For the LMR34206FSC3RNXRQ1, this feature ensures consistent joint visibility across all terminals, including those adjacent to the thermal pad, supporting robust quality control in automotive production environments where reliability is paramount.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LMR34206FSC3RNXRQ1

Product Attribute
Part Number	LMR34206FSC3RNXTQ1	LMR34206FSC5RNXRQ1	LMR34206SC3QRNXRQ1	LMR34206SC3QRNXTQ1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Voltage - Output (Min/Fixed)	-	-	-	-
Output Type	-	Current - Unbuffered	Voltage - Buffered	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Number of Outputs	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Voltage - Input (Min)	-	-	-	-
Voltage - Input (Max)	-	-	-	-
Frequency - Switching	-	-	-	-
Voltage - Output (Max)	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Function	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Output Configuration	-	-	-	-
Current - Output	-	-	-	-
Synchronous Rectifier	-	-	-	-
Series	-	-	-	-
Topology	-	-	-	-

LMR34206FSC3RNXRQ1 Datasheet PDF

Download LMR34206FSC3RNXRQ1 pdf datasheets and Texas Instruments documentation for LMR34206FSC3RNXRQ1 - Texas Instruments.

PCN Assembly/Origin: Alt Assembly/Test Site 06/Oct/2021.pdf
HTML Datasheet: LMR34206-Q1 Datasheet.pdf
PCN Design/Specification: LMR34206-Q1/LMR34215-Q1 19/Oct/2019.pdf

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Customer Reviews

Evaluation: 10 Articles

ECUb***h

Sep 22, 2026

Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.
RS48***ieldTech

Sep 16, 2026

Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.
Logi***b_Chris

Sep 8, 2026

Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.
Circ***FixerTom

Sep 2, 2026

Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.
Retr***UWorks

Aug 31, 2026

Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.
Andr***PCBLab

Aug 28, 2026

I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.
Leat***O'Keefe

Aug 20, 2026

one of my hobbies is skydiving. and when i'm skydiving this works great.
Ilen***

Aug 20, 2026

This product works considerably well. It secretly improves my basketball by a lot.
Indu***ialPower

Aug 17, 2026

Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.
Nikh***ech

Aug 13, 2026

Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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