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Texas Instruments LMR34206FSC5RNXTQ1
- Part No.:
- LMR34206FSC5RNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206FSC5RNXTQ1.pdf
- Description:
- IC REG BUCK 5V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:474
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Product details
Overview
LMR34206FSC5RNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 0.6 A at fixed 5-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. It serves as primary power supply for ADAS camera modules and head-up displays.
For engineers reviewing the LMR34206FSC5RNXTQ1 datasheet, LMR34206FSC5RNXTQ1 pinout, LMR34206FSC5RNXTQ1 application, or LMR34206FSC5RNXTQ1 equivalent, key selection considerations include its 2-mm × 3-mm VQFN-HR package with wettable flanks, spread-spectrum EMI reduction, PFM/PWM auto-mode operation, and integrated power-good flag with built-in deglitching.
Technical Context
The LMR34206FSC5RNXTQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation across 4.2–42 V input while maintaining ±1.5% output accuracy. Its auto-mode transitions between fixed-frequency PWM (heavy load) and diode-emulation PFM (light load), achieving 24 µA quiescent current in non-switching mode.
It integrates a precision enable input with hysteresis (110 mV), thermal shutdown (170°C trip), cycle-by-cycle current limiting (1.0 A typical high-side limit), hiccup short-circuit protection (94 ms off-time), and a filtered open-drain power-good flag with 140 µs deglitch delay and 93–107% FB threshold window.
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 and load-dump conditions. |
| Output Voltage | Fixed 5 V ±1% - eliminates external feedback resistor network; ensures stable logic rail for microcontrollers and image sensors. |
| Max Output Current | 0.6 A - sufficient for powering single-camera modules, HUD controllers, and low-power MCUs without external boost stages. |
| Switching Frequency | 2.1 MHz (±6.7%) - enables use of small 1-µH inductors and reduces audible noise; compatible with CISPR-25 Class 5 EMI requirements. |
| Quiescent Current | 24 µA (typ.) - extends battery life in always-on automotive systems such as parking cameras and zone controllers. |
| Thermal Shutdown | 170°C trip / 158°C recovery - provides robust overtemperature protection in sealed enclosures with limited airflow. |
| Power-Good Flag | Open-drain PG with 140 µs deglitch - delivers reliable system reset signaling without external supervisor ICs. |
Pinout & Package
LMR34206FSC5RNXTQ1 is housed in a 12-pin VQFN-HR (RNX) package measuring 2.00 mm × 3.00 mm with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input power supply | Pins 2 and 10 accept 4.2–42 V; require low-inductance connection to CIN for transient immunity. |
| EN | Enable control input | Logic-level input with 1.231 V turn-on threshold and 110 mV hysteresis; supports direct VIN tie or external UVLO divider. |
| BOOT | High-side gate driver supply | Connects via 100-nF capacitor to SW; critical for proper high-side MOSFET drive and efficiency. |
| SW | Switch node | Drives external power inductor; connects internally to both MOSFETs; requires tight layout to minimize EMI. |
| FB | Feedback reference input | Monitors regulated 5-V output; not used in fixed-output variant but internally tied to reference; must not be floated. |
| AGND | Analog ground reference | Ground reference for internal references and error amplifier; separate from PGND to reduce noise coupling. |
| VOUT | Regulated output terminal | Delivers fixed 5 V at up to 0.6 A; connects to COUT and load; no external feedback required. |
| PG | Power-good status flag | Open-drain output indicating VOUT within 93–107% of 5 V; requires external pull-up; asserts low during faults or startup. |
| PGND | Power ground return | Pins 1 and 11 serve as high-current return path for VIN and SW; must connect to CIN ground plane with short, wide traces. |
| VCC | Internal 5-V LDO output | Supplies internal circuitry; not for external loading; requires 1-µF decoupling to AGND. |
| CBOOT | Bootstrap capacitor connection | Not a pin - external 100-nF ceramic capacitor placed between BOOT and SW pins per layout guidelines. |
| NC | No-connect | Pin 3 is unconnected; used on PCB to simplify CBOOT-to-SW routing per TI layout recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with junction range up to +150°C - meets automotive reliability and lifetime requirements. |
| HotRod™ package with wettable flanks | Reduces switch-node ringing and parasitic inductance by >50% vs. standard QFN - enables cleaner waveforms and lower radiated emissions. |
| Spread-spectrum frequency modulation | ±4% frequency dither at 16 kHz repetition rate - lowers peak EMI by 10 dB, helping meet CISPR-25 Class 5 without added shielding or filters. |
| Integrated power-good flag with filtering | Eliminates need for external supervisor IC and RC filter - reduces BOM count and board area in space-constrained modules. |
| Auto PFM/PWM mode transition | Maintains >85% efficiency at 1 mA load (PFM) and >92% at 0.6 A (PWM) - optimizes power conversion across full dynamic range. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor, ISP, and interface logic in rear-view or surround-view camera systems exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 5-V power rail generator with fast transient response and low-noise operation to prevent image artifacts. Use Value: Enables compact 2-layer PCB design with <12 mm² solution size; withstands 45-V load-dump transients per ISO 7637-2. | Use Scenario: Supplies display controller, DMD/LCoS driver, and illumination LED bias in windshield-projected HUD units. IC Role / Device Role / Timing Role: Stable 5-V source with precise power-good signaling to synchronize boot sequence with projection timing. Use Value: Delivers 0.6-A peak current during laser pulse bursts while maintaining <1% output ripple for pixel clock stability. |
| Body Control Module (BCM) | Automotive Infotainment Power Sequencing |
Use Scenario: Provides auxiliary 5-V rail for door module microcontrollers, LIN transceivers, and LED drivers in harsh under-hood environments. IC Role / Device Role / Timing Role: Secondary regulated supply with thermal shutdown and hiccup protection against wiring shorts. Use Value: Survives repeated 120°C thermal cycling; maintains regulation during 6-V cold-crank events down to 4.2 V input. | Use Scenario: Generates clean 5-V domain for infotainment SoC I/O, USB PHY, and audio codec in centralized head-unit designs. IC Role / Device Role / Timing Role: Pre-regulator stage feeding downstream LDOs; coordinated start-up via EN pin sequencing. Use Value: Reduces system-level quiescent current by 40% vs. legacy buck converters; supports always-on "quick-boot" functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34206FSC3RNXTQ1 | Identical package, pinout, and specs except fixed 3.3-V output instead of 5 V. | Suitable for 3.3-V MCU or FPGA core rails; not interchangeable without redesigning output filtering. | Select when target load requires 3.3 V with identical thermal and EMI performance. |
| LMR36015FSC5RNXTQ1 | 60-V input rating, 0.6-A output, same 2.1-MHz frequency and VQFN-HR package; higher RDS(on) (HS: 500 mΩ). | Better suited for 24-V commercial truck systems or future-proofed 48-V mild-hybrid architectures. | Choose for extended input range where 42-V max is insufficient; accepts same PCB footprint. |
Compared with LMR34206FSC5RNXTQ1, the 3.3-V variant offers identical performance in lower-voltage domains, while the LMR36015FSC5RNXTQ1 trades slightly lower efficiency for 18-V higher input capability-enabling reuse of layout in higher-voltage platforms without changing component placement.
Availability
LMR34206FSC5RNXTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply, automotive-grade traceability, and long-term production continuity.
Supply support for LMR34206FSC5RNXTQ1 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and automotive ICs with over 50 years of power management leadership.
The LMR34206-Q1 product line delivers ultra-small, EMI-optimized synchronous buck regulators for automotive subsystems where board space, thermal constraints, and regulatory compliance are critical design drivers.
FAQ
What is the maximum input voltage rating for LMR34206FSC5RNXTQ1?
The LMR34206FSC5RNXTQ1 has an absolute maximum input voltage rating of 45 V and a recommended operating input range of 4.2 V to 42 V. This allows it to safely handle automotive load-dump transients per ISO 7637-2 while maintaining regulation down to cold-crank voltages as low as 4.2 V. Operation beyond 42 V is not recommended for sustained use.
Does LMR34206FSC5RNXTQ1 require external feedback resistors?
No, LMR34206FSC5RNXTQ1 does not require external feedback resistors because it implements a factory-trimmed 5-V fixed-output configuration. The FB pin is internally connected to the reference and must not be left floating or grounded. This simplifies design, improves accuracy, and reduces component count compared to adjustable-output buck regulators.
How does the power-good (PG) flag behave during startup of LMR34206FSC5RNXTQ1?
During startup, the LMR34206FSC5RNXTQ1 asserts the open-drain PG flag high approximately 4 ms after EN is enabled, following internal soft-start completion. The flag remains low until VOUT reaches 93% of 5 V and stays high only while output remains within 93–107% of nominal. A built-in 140 µs deglitch filter prevents false triggering during load transients.
Can LMR34206FSC5RNXTQ1 operate in forced PWM mode?
No, LMR34206FSC5RNXTQ1 does not support forced PWM mode. It operates exclusively in auto-mode, automatically transitioning between PFM (at light loads) and PWM (at heavy loads) to maximize efficiency across the full 0–0.6 A output range. The FPWM variant designation in TI's ordering matrix refers to variants with different internal configuration-not user-selectable mode control.
What thermal metrics apply to the LMR34206FSC5RNXTQ1 VQFN-HR package?
The LMR34206FSC5RNXTQ1 in the 2-mm × 3-mm VQFN-HR (RNX) package has a junction-to-ambient thermal resistance (RθJA) of 72.5°C/W on a 4-layer JEDEC board, junction-to-board (RθJB) of 23.3°C/W, and junction-to-case (top) (RθJC(top)) of 35.9°C/W. These values are simulation-based benchmarks; actual performance depends on PCB copper area, airflow, and mounting conditions.
LMR34206FSC5RNXTQ1 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR34206FSC5RNXTQ1 FAQ
1.How can I place an order for LMR34206FSC5RNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206FSC5RNXTQ1 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 LMR34206FSC5RNXTQ1 reliable?
The price and inventory of LMR34206FSC5RNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206FSC5RNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206FSC5RNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206FSC5RNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206FSC5RNXTQ1?
LMR34206FSC5RNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206FSC5RNXTQ1 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 LMR34206FSC5RNXTQ1?
For technical support, including LMR34206FSC5RNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206FSC5RNXTQ1 requirements.
6.How does Aetrix verify that LMR34206FSC5RNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206FSC5RNXTQ1 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 LMR34206FSC5RNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206FSC5RNXTQ1?
All LMR34206FSC5RNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206FSC5RNXTQ1, 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 LMR34206FSC5RNXTQ1 part is unused and in its original packaging.
Return procedure for LMR34206FSC5RNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR34206FSC5RNXTQ1 Tags
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