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Texas Instruments LMR34206FSC5RNXRQ1
- Part No.:
- LMR34206FSC5RNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206FSC5RNXRQ1.pdf
- Description:
- IC REG BUCK 5V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,988
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Product details
Overview
LMR34206FSC5RNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering up to 0.6 A output current across a 4.2-V to 42-V input range, with fixed 5-V output, 2.1-MHz switching frequency, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs - deployed in ADAS camera modules and head-up displays.
For engineers reviewing the LMR34206FSC5RNXRQ1 datasheet, LMR34206FSC5RNXRQ1 pinout, LMR34206FSC5RNXRQ1 application, or LMR34206FSC5RNXRQ1 equivalent, key selection considerations include its HotRod™ VQFN-HR (12) package with wettable flanks, spread-spectrum EMI reduction, PFM/PWM auto-mode operation, 24 µA quiescent current, and power-good flag with built-in deglitching.
Technical Context
The LMR34206FSC5RNXRQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode transitions between fixed-frequency PWM at heavy loads and diode-emulation PFM at light loads to maintain high efficiency across the full 0–0.6-A load range.
It integrates protection features including cycle-by-cycle current limit (0.8–1.2 A high-side, 0.6–0.95 A low-side), hiccup-mode short-circuit response (~94 ms off-time), thermal shutdown (170°C trip, 158°C recovery), and input UVLO - all qualified for automotive junction temperatures from –40°C to +150°C.
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; enables direct powering of MCU I/O, sensors, and interface ICs. |
| Max Output Current | 0.6 A continuous - sufficient for single-camera imaging pipelines, HUD display drivers, and body control sub-systems. |
| Switching Frequency | 2.1 MHz (±6.7%) - allows use of compact 2.2-µH inductors and fits within CISPR-25 Class 5 conducted/emission limits. |
| Quiescent Current | 24 µA typical (non-switching) - extends battery life in always-on automotive modules during sleep mode. |
| Thermal Shutdown | 170°C trip / 158°C recovery - provides robust overtemperature protection without latch-up, supporting sustained operation in under-hood environments. |
| EMI Performance | CISPR-25 Class 5 compliant - achieved via HotRod™ packaging, parallel input path, and ±4% triangular spread spectrum. |
Pinout & Package
LMR34206FSC5RNXRQ1 is housed in a 2.00 mm × 3.00 mm, 12-pin VQFN-HR package with wettable flanks for automated optical inspection (AOI) and enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Main supply input (4.2–42 V); requires low-inductance connection to CIN and PGND for stability and EMI control. |
| EN | Enable control | Logic-level input with precision thresholds (1.157–1.3 V turn-on); supports direct VIN tie or external UVLO divider. |
| BOOT | High-side gate drive supply | Connects to SW via 100-nF ceramic capacitor; critical for proper high-side MOSFET turn-on and efficiency. |
| SW | Switch node | Connection point for power inductor; high dv/dt node requiring minimized trace area and tight coupling to BOOT/CBOOT. |
| FB | Feedback sense | Internal 1-V reference; monitors output via resistive divider - must not be floated or grounded. |
| AGND | Analog ground | Reference for FB, EN, PG, and internal circuits; separate from PGND but tied on PCB with low-impedance plane. |
| VOUT | Regulated output | 5-V fixed output; connects to COUT and load; used as logic supply for PG when pulled up to VOUT. |
| PG | Power-good flag | Open-drain output with 80–165 Ω on-resistance; asserts high after soft-start (4-ms delay) when VOUT is within ±7% of 5 V. |
| PGND | Power ground | High-current return path for VIN, SW, and CIN; must be connected to AGND with short, wide traces near CIN. |
| VCC | Internal LDO output | 5-V internal supply (4.75–5.25 V); powers control circuitry; decoupled with 1-µF capacitor to AGND. |
| CBOOT | Bootstrap capacitor terminal | Not a pin - external 100-nF capacitor connects BOOT to SW; required for high-side driver bootstrap operation. |
| NC | No-connect | Pins 3 and 11 are unconnected; used on PCB to simplify CBOOT routing to SW - no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN-HR packaging | Reduces switch-node ringing and parasitic inductance by >50% vs. standard QFN, enabling cleaner EMI signature and higher efficiency. |
| Auto PFM/PWM mode transition | Maintains >85% efficiency at 1-mA load (PFM) and >92% at 0.6-A load (PWM), eliminating need for manual mode selection. |
| Integrated power-good flag with deglitching | 80–200 µs built-in filter prevents false resets during line/load transients; eliminates external supervisor IC in most automotive systems. |
| Spread-spectrum clocking | ±4% frequency dithering at 16-kHz repetition rate reduces peak radiated emissions by up to 10 dB, aiding CISPR-25 Class 5 compliance. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient (–40°C to +150°C junction), including HTOL, temperature cycling, and ESD (HBM ±2.5 kV). |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and serializer in rear-view or surround-view camera units exposed to under-hood thermal stress and battery rail transients. IC Role / Device Role / Timing Role: Primary 5-V power rail regulator with fast transient response and fault signaling via PG flag to camera SoC reset domain. Use Value: Enables compact 2-layer PCB layout due to small 2×3-mm footprint and minimal external components; meets ASIL-B functional safety requirements via built-in diagnostics. |
Use Scenario: Supplies 5-V logic and analog rails for DMD or LCoS microdisplay drivers, LED backlight controllers, and projection optics processors. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable, low-noise 5-V supply synchronized to display frame timing; PG flag triggers HUD boot sequence validation. Use Value: Spread-spectrum operation suppresses switching noise coupling into sensitive analog video paths; 24-µA IQ extends ignition-off runtime for HUD memory retention. |
| Body Control Module (BCM) | Automotive Infotainment Power Sequencing |
|
Use Scenario: Generates auxiliary 5-V rail for door module MCUs, LIN transceivers, and LED status indicators in distributed vehicle networks. IC Role / Device Role / Timing Role: Secondary power stage downstream of main 12-V system rail; EN pin controlled by BCM master MCU for coordinated power-up/down sequencing. Use Value: Pin compatibility with LMR33620/30-Q1 allows scalable design reuse across BCM variants; thermal shutdown protects against enclosure overheating in sealed junction boxes. |
Use Scenario: Provides clean, sequenced 5-V supply to infotainment head-unit SoC I/O, audio codecs, and USB PHYs during cold-start and wake-from-sleep transitions. IC Role / Device Role / Timing Role: Regulator with precise enable thresholds and 4-ms soft-start ensures controlled voltage ramp before SoC release from reset. Use Value: ±1.5% reference tolerance guarantees reliable level-shifting across multiple voltage domains; PG flag confirms rail readiness to application processor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34206FSC3RNXRQ1 | 3.3-V fixed output; identical package, pinout, and electrical specs except FB reference and output voltage. | Targets 3.3-V logic domains (e.g., CAN FD transceivers, Ethernet PHYs) instead of 5-V peripherals. | Select when system requires 3.3-V rail with same thermal/EMI profile and automotive qualification. |
| LMR36015FSC5RNXRQ1 | 60-V max input, 0.6-A rating, same 2×3-mm VQFN-HR package and pinout; higher RDS(on) (HS: 500 mΩ, LS: 320 mΩ). | Suitable for 48-V mild-hybrid architectures or systems requiring extended input range beyond 42 V. | Choose for future-proofing in 48-V platforms or where load dump immunity beyond 42 V is mandated. |
Compared with LMR34206FSC5RNXRQ1, the 3.3-V variant offers identical performance in lower-voltage domains, while the 60-V LMR36015FSC5RNXRQ1 trades higher input capability for slightly reduced efficiency at 12-V nominal inputs - both retain pin compatibility and AEC-Q100 Grade 1 qualification.
Availability
LMR34206FSC5RNXRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply, automotive-grade reliability, and long-term production continuity.
Supply support for LMR34206FSC5RNXRQ1 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 leader specializing in analog, embedded processing, and automotive-grade power management solutions, with decades of automotive qualification expertise and broad manufacturing scale.
The LMR34206FSC5RNXRQ1 belongs to TI's LMR3-Q1 family of ultra-small, high-efficiency synchronous buck converters designed specifically for space-constrained, thermally demanding automotive subsystems such as vision, lighting, and domain controllers.
FAQ
What is the maximum input voltage rating for the LMR34206FSC5RNXRQ1?
The LMR34206FSC5RNXRQ1 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 withstand automotive load-dump transients up to 42 V while maintaining regulation, and the 45-V absolute max provides margin for brief overvoltage events. Operation above 42 V is not recommended for sustained use.
Does the LMR34206FSC5RNXRQ1 require external compensation components?
No, the LMR34206FSC5RNXRQ1 uses internal loop compensation, eliminating the need for external compensation networks. This simplifies design, reduces bill-of-materials count, and improves consistency across production units. The device is optimized for use with standard 2.2-µH shielded inductors and ceramic output capacitors.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR34206FSC5RNXRQ1?
The LMR34206FSC5RNXRQ1 PG pin remains low for ~4 ms after EN assertion, then goes high when VOUT reaches 95% of 5 V and stays within regulation. It pulls low during undervoltage (VOUT < 93%), overcurrent, thermal shutdown, or EN deactivation. Its 80–200 µs deglitching prevents false triggering during normal transients.
Can the LMR34206FSC5RNXRQ1 operate in forced PWM mode, or is it limited to auto PFM/PWM?
The LMR34206FSC5RNXRQ1 supports FPWM mode - enabled via the FSEL pin configuration (not present on this variant) or selected at orderable part level. The LMR34206FSC5RNXRQ1 is the FPWM-enabled version, ensuring constant 2.1-MHz switching across all loads, which eliminates audible noise and simplifies EMI filtering compared to PFM-only variants.
What thermal metrics apply to the LMR34206FSC5RNXRQ1 in its VQFN-HR package?
The LMR34206FSC5RNXRQ1 in the 2×3-mm VQFN-HR (RNX) package has a junction-to-board thermal resistance (RθJB) of 23.3°C/W and a junction-to-ambient value (RθJA) of 72.5°C/W on a 4-layer JEDEC board. These values support >0.6-A operation at +85°C ambient with minimal copper area, validated per AEC-Q100 thermal test requirements.
LMR34206FSC5RNXRQ1 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)
LMR34206FSC5RNXRQ1 FAQ
1.How can I place an order for LMR34206FSC5RNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206FSC5RNXRQ1 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 LMR34206FSC5RNXRQ1 reliable?
The price and inventory of LMR34206FSC5RNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206FSC5RNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206FSC5RNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206FSC5RNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206FSC5RNXRQ1?
LMR34206FSC5RNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206FSC5RNXRQ1 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 LMR34206FSC5RNXRQ1?
For technical support, including LMR34206FSC5RNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206FSC5RNXRQ1 requirements.
6.How does Aetrix verify that LMR34206FSC5RNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206FSC5RNXRQ1 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 LMR34206FSC5RNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206FSC5RNXRQ1?
All LMR34206FSC5RNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206FSC5RNXRQ1, 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 LMR34206FSC5RNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34206FSC5RNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR34206FSC5RNXRQ1 Tags
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