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Texas Instruments LMR34206FSC3RNXTQ1
- Part No.:
- LMR34206FSC3RNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206FSC3RNXTQ1.pdf
- Description:
- IC REG BUCK 3.3V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,145
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Product details
Overview
LMR34206FSC3RNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 0.6 A at fixed 3.3 V output, operating from 4.2 V to 42 V input, featuring 2.1-MHz switching frequency, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs for ADAS camera module power rails.
For engineers reviewing the LMR34206FSC3RNXTQ1 datasheet, LMR34206FSC3RNXTQ1 pinout, LMR34206FSC3RNXTQ1 application, or LMR34206FSC3RNXTQ1 equivalent, key selection considerations include automotive-grade thermal shutdown (170°C), ultra-low 24 µA quiescent current in PFM mode, CISPR25 Class 5 EMI compliance, and HotRod™ VQFN-HR package with wettable flanks for reliable solder joint inspection.
Technical Context
The LMR34206FSC3RNXTQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation across 4.2–42 V input without external compensation components. It automatically transitions between PWM (constant 2.1 MHz) and PFM (diode-emulation burst mode) based on load, maintaining high efficiency from full load down to microamp-level currents.
Its HotRod™ flip-chip VQFN-HR package minimizes parasitic inductance via optimized power loop routing and parallel input paths, reducing switch-node ringing and enabling CISPR25 Class 5 EMI performance. The device integrates a precision enable input with hysteresis (110 mV), open-drain power-good flag with 140 µs deglitch delay, and dual current-limit protection (peak high-side at 1 A, valley low-side at 0.8 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 42 V - supports wide automotive battery transients including cold-crank (4.2 V) and load-dump (42 V) |
| Output Voltage | Fixed 3.3 V ±1.5% - eliminates external feedback resistor network; ensures accurate logic rail for image sensors and MCUs |
| Max Output Current | 0.6 A - sufficient for single-lane MIPI CSI-2 camera modules and HUD display controllers |
| Switching Frequency | 2.1 MHz (±6.7%) - enables use of small 1–2.2 µH inductors and avoids AM radio band interference |
| Quiescent Current | 24 µA (typ.) in PFM - extends battery life in always-on ADAS vision systems during standby |
| Thermal Shutdown | 170°C shutdown / 158°C recovery - provides robust overtemperature protection in sealed automotive enclosures |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added shielding |
Pinout & Package
LMR34206FSC3RNXTQ1 is housed in a 2.00 mm × 3.00 mm, 12-pin VQFN-HR (RNX) package with wettable flanks for automated optical inspection (AOI) of solder joints. The thermally enhanced HotRod™ construction places power pads directly under the die for optimal heat transfer to PCB ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 2, 10) | Power Input | Main input supply path; requires short, wide traces to CIN capacitor to minimize high-frequency loop inductance |
| PGND (Pins 1, 11) | Power Ground | High-current return for VIN and SW; must be connected to AGND and system ground with low-inductance plane |
| SW (Pin 12) | Switch Node | Connection point for external power inductor; drives both high-side and low-side MOSFETs internally |
| BOOT (Pin 4) | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET; requires 100-nF ceramic capacitor to SW |
| VCC (Pin 5) | Internal LDO Output | 5-V regulated supply for internal circuitry; decoupled with 1-µF capacitor to AGND; not for external loads |
| FB (Pin 7) | Feedback Input | Monitors regulated 3.3-V output via internal resistor divider; must not be floated or grounded |
| PG (Pin 8) | Power-Good Flag | Open-drain status signal indicating VOUT within ±7% of nominal; includes 140-µs glitch filter |
| EN (Pin 9) | Enable Control | Logic-level input with precise thresholds (1.231 V turn-on, 1.157 V turn-off); supports direct VIN connection or external UVLO |
| AGND (Pin 6) | Analog Ground | Reference for FB, EN, PG, and internal references; must tie to PGND at single point near device |
| NC (Pins 3, 11) | No Connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing per TI layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with 150°C junction rating - suitable for under-hood and camera module mounting |
| Integrated HotRod™ MOSFETs | 225 mΩ high-side and 150 mΩ low-side RDS(on) - eliminates external FETs and reduces solution size by >30% vs discrete designs |
| Spread-spectrum modulation | ±4% frequency dither at 16 kHz repetition rate - lowers peak EMI by up to 10 dB without affecting regulation stability |
| Auto PFM/PWM transition | Seamless mode switching at ~100 mA load - maintains >85% efficiency from 10 µA to 600 mA without manual configuration |
| Robust fault protection | Thermal shutdown, hiccup-mode short-circuit response (94 ms off-time), cycle-by-cycle current limit, and input UVLO - prevents damage during line/load faults |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor, ISP, and MIPI transmitter in automotive forward-facing camera units exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 3.3-V power rail regulator with fast transient response (<10 µs recovery) and low noise for analog pixel readout circuits. Use Value: Enables compact, EMI-compliant design meeting ISO 16750-2 pulse 4/5 requirements while maintaining <1% output ripple at 600 mA. | Use Scenario: Supplies 3.3-V logic and analog bias for DLP or LCoS projection engines in windshield-mounted HUD systems. IC Role / Device Role / Timing Role: Stable, low-noise DC/DC source for timing-critical video interface ICs and laser driver bias networks. Use Value: Delivers consistent 3.3-V output across 5–36 V input range during vehicle start-stop cycles, eliminating need for pre-regulator stages. |
| Body Control Module (BCM) | General Purpose Wide VIN Power Supply |
Use Scenario: Provides auxiliary 3.3-V rail for CAN FD transceivers, LIN controllers, and LED drivers in centralized body electronics units. IC Role / Device Role / Timing Role: Secondary regulated supply with independent enable control and power-good signaling for system-level sequencing. Use Value: Supports hot-plug capability and brown-out detection via precision EN threshold (±75 mV hysteresis) and PG flag with 2-V minimum valid input. | Use Scenario: Serves as scalable 3.3-V source in industrial IoT gateways, telematics control units, and infotainment head units requiring wide-input compatibility. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for LMR36015-Q1 and LMR33620-Q1 families - simplifies BOM consolidation across voltage/current variants. Use Value: Reduces design reuse effort with identical 2×3 mm footprint and shared layout guidelines, cutting validation time by ≥40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34206FSC5RNXTQ1 | Fixed 5-V output instead of 3.3 V; identical 2.1-MHz frequency, package, and protection features | Targets 5-V logic interfaces (e.g., USB PHY, Ethernet MAC) rather than 3.3-V sensor/processor rails | Select when system requires 5-V output; no layout changes needed due to identical pinout and thermal profile |
| LMR36015FSC3RNXTQ1 | 60-V max input (vs. 42 V), 1.5-A output (vs. 0.6 A); same 2.1-MHz frequency and VQFN-HR package | Suitable for higher-power ADAS radar modules or gateway ECUs needing wider input margin and greater current headroom | Choose for future-proofing or higher-current derivatives; shares layout and footprint but requires revalidation of inductor and output capacitance |
Compared with LMR34206FSC3RNXTQ1, the 5-V variant offers identical reliability and EMI performance for different voltage rails, while the 60-V/1.5-A alternative extends input range and output capability at the cost of higher conduction loss in 3.3-V/0.6-A applications - making LMR34206FSC3RNXTQ1 optimal for space-constrained, low-power automotive imaging systems.
Availability
LMR34206FSC3RNXTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply with AEC-Q100 qualification and long-term automotive lifecycle support.
Supply support for LMR34206FSC3RNXTQ1 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive power management and high-reliability IC design.
The LMR34206-Q1 belongs to TI's automotive-qualified SIMPLE SWITCHER® DC/DC converter family, engineered specifically for space-constrained, EMI-sensitive automotive subsystems such as vision processing, digital cockpit, and domain controller power rails.
FAQ
What is the maximum input voltage rating for the LMR34206FSC3RNXTQ1?
The LMR34206FSC3RNXTQ1 has an absolute maximum input voltage rating of 45 V and a recommended operating input voltage range of 4.2 V to 42 V. This allows it to withstand automotive load-dump transients while maintaining regulation across cold-crank conditions down to 4.2 V. Operation beyond 42 V is not recommended for sustained use, as it exceeds the specified operating range and may impact long-term reliability.
Does the LMR34206FSC3RNXTQ1 require external compensation components?
No, the LMR34206FSC3RNXTQ1 uses internal loop compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and improves consistency across production units. The device is optimized for standard 1–2.2 µH inductors and ceramic output capacitors, with layout guidelines provided in the datasheet to ensure stability without tuning.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR34206FSC3RNXTQ1?
The LMR34206FSC3RNXTQ1 PG pin asserts high after a typical 4-ms delay following EN assertion, indicating stable 3.3-V output. It goes low during undervoltage (FB < 93% of nominal), overcurrent hiccup events, thermal shutdown, or when EN is deasserted. With built-in 140-µs deglitching, brief transients do not trigger false flags. The open-drain output requires an external pullup resistor to VCC or VOUT and remains valid down to 2 V input.
Can the LMR34206FSC3RNXTQ1 operate in forced PWM (FPWM) mode, and how is it enabled?
Yes, the LMR34206FSC3RNXTQ1 supports FPWM mode to eliminate audible noise and maintain constant frequency under light loads. FPWM is enabled by connecting the MODE pin (not present on this variant) - however, the LMR34206FSC3RNXTQ1 is the FPWM-enabled version per its orderable part number suffix 'F', meaning it defaults to forced PWM operation without requiring external configuration. This ensures predictable EMI behavior across all load conditions.
What thermal performance can be expected from the LMR34206FSC3RNXTQ1 in a standard 4-layer JEDEC board layout?
On a standard 4-layer JEDEC board, the LMR34206FSC3RNXTQ1 exhibits a junction-to-ambient thermal resistance (RθJA) of 72.5°C/W. With its 2×3 mm HotRod™ VQFN-HR package and integrated thermal pad, it achieves a junction-to-board resistance (RθJB) of 23.3°C/W - indicating efficient heat transfer to the PCB. At 0.6-A load and 12-V input, typical junction temperature rise is ≤35°C above ambient, well within the –40°C to +150°C operating range.
LMR34206FSC3RNXTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR34206FSC3RNXTQ1 FAQ
1.How can I place an order for LMR34206FSC3RNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206FSC3RNXTQ1 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 LMR34206FSC3RNXTQ1 reliable?
The price and inventory of LMR34206FSC3RNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206FSC3RNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206FSC3RNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206FSC3RNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206FSC3RNXTQ1?
LMR34206FSC3RNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206FSC3RNXTQ1 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 LMR34206FSC3RNXTQ1?
For technical support, including LMR34206FSC3RNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206FSC3RNXTQ1 requirements.
6.How does Aetrix verify that LMR34206FSC3RNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206FSC3RNXTQ1 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 LMR34206FSC3RNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206FSC3RNXTQ1?
All LMR34206FSC3RNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206FSC3RNXTQ1, 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 LMR34206FSC3RNXTQ1 part is unused and in its original packaging.
Return procedure for LMR34206FSC3RNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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