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Texas Instruments LMR34206SC3QRNXRQ1
- Part No.:
- LMR34206SC3QRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206SC3QRNXRQ1.pdf
- Description:
- IC REG BUCK 3.3V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
LMR34206SC3QRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive 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 3.3 V output, 2.1 MHz switching frequency, and integrated high-side/low-side MOSFETs - used in ADAS camera modules for compact, low-EMI power rail generation.
For engineers reviewing the LMR34206SC3QRNXRQ1 datasheet, LMR34206SC3QRNXRQ1 pinout, LMR34206SC3QRNXRQ1 application, or LMR34206SC3QRNXRQ1 equivalent, key selection considerations include its HotRod™ VQFN-HR (12) package with wettable flanks, ±1.5% reference voltage tolerance, 24 µA quiescent current in PFM mode, and CISPR25 Class 5 EMI compliance.
Technical Context
The LMR34206SC3QRNXRQ1 employs peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. It automatically transitions between PWM (constant 2.1 MHz) at medium-to-heavy loads and PFM with diode emulation at light loads to maintain high efficiency across the full 0–0.6 A load range.
Its functional safety features include cycle-by-cycle current limiting, hiccup-mode short-circuit protection (94 ms off-time), thermal shutdown (170°C trip / 158°C recovery), and precision enable thresholds (1.157–1.3 V turn-on hysteresis). The integrated 5-V VCC LDO powers internal circuitry and supports logic-level PG flag operation.
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 resistors; enables direct powering of MCU I/O rails and sensors. |
| Max Output Current | 0.6 A - sufficient for imaging sensors, SerDes interfaces, and low-power microcontrollers in camera modules. |
| Switching Frequency | 2.1 MHz (±7%) - allows use of small 1–2.2 µH inductors and fits above AM radio band to simplify EMI filtering. |
| Quiescent Current | 24 µA (typ.) in PFM - extends battery life during vehicle sleep modes without compromising wake-up responsiveness. |
| Reference Voltage Tolerance | ±1.5% - ensures tight output regulation under temperature and line variations for reliable system operation. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added shielding or complex layout. |
Pinout & Package
LMR34206SC3QRNXRQ1 is housed in a 2.00 mm × 3.00 mm, 12-pin VQFN-HR (HotRod™) package with wettable flanks for automated optical inspection (AOI) and enhanced thermal performance (RθJA = 72.5°C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 2, 10) | Primary input power supply | Accepts 4.2–42 V; requires low-inductance connection to CIN for transient robustness and EMI reduction. |
| PGND (Pins 1, 11) | Power ground return | Must be connected directly to AGND and CIN ground plane via short, wide traces to minimize switching noise coupling. |
| EN (Pin 9) | Enable control input | Logic-compatible (1.157–1.3 V turn-on); supports direct VIN tie or external UVLO divider; must not float. |
| BOOT (Pin 4) | High-side gate driver supply | Requires 100 nF ceramic capacitor to SW; SW-to-NC PCB routing simplifies layout and reduces parasitic inductance. |
| SW (Pin 12) | Switch node | Connects to power inductor; high dv/dt node - minimized ringing via HotRod™ flip-chip construction and parallel input paths. |
| FB (Pin 7) | Feedback reference input | Internally tied to 3.3 V output; no external resistor divider needed - eliminates component count and drift errors. |
| AGND (Pin 6) | Analog ground reference | Ground reference for FB, EN, PG; must be star-connected to PGND near device to avoid noise injection into control loop. |
| PG (Pin 8) | Open-drain power-good flag | Indicates regulated output (105–110% / 90–95% FB thresholds); includes 80–200 µs glitch filter and valid down to 2 V VIN. |
| VCC (Pin 5) | Internal 5-V LDO output | Powers internal logic; can supply PG pull-up or external logic; requires 1 µF decoupling to AGND. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; used on PCB to route CBOOT to SW - improves layout symmetry and reduces trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation and –40°C to +150°C junction temperature - suitable for under-hood and ADAS front-end placement. |
| HotRod™ VQFN-HR package | Flip-chip construction reduces pin inductance by >50% vs. standard QFN - suppresses switch-node ringing and lowers radiated EMI. |
| Integrated spread spectrum | ±4% frequency dithering at 16 kHz repetition rate - reduces peak EMI amplitude by up to 10 dB without affecting regulation stability. |
| Auto PFM/PWM mode transition | Seamlessly shifts between high-efficiency PFM (24 µA IQ) at light loads and constant-frequency PWM (2.1 MHz) at full load - eliminates manual mode selection. |
| True power-good with built-in delay | PG flag asserts only after soft-start completion (~4 ms) and includes 80–200 µs deglitching - prevents false resets during transients or startup. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers image sensor, ISP, and serializer in automotive forward-facing camera systems operating across battery voltage transients (4.2–42 V). IC Role / Device Role / Timing Role: Primary 3.3 V power rail regulator with fast transient response and ultra-low EMI to prevent RF interference with radar and V2X receivers. Use Value: Enables single-layer, compact PCB layout due to integrated MOSFETs and minimal external components - reduces BOM cost and board area by >30% vs. controller+MOSFET solutions. | Use Scenario: Supplies 3.3 V logic and timing circuits for HUD projection units mounted in instrument clusters or windshield assemblies. IC Role / Device Role / Timing Role: Stable, low-noise DC/DC source for DMD or LCoS display drivers and microcontroller peripherals requiring clean, ripple-free voltage. Use Value: Meets CISPR25 Class 5 emissions limits without ferrite beads or shielded inductors - accelerates EMC certification and avoids costly re-spins. |
| Body Control Module (BCM) | Automotive Infotainment Power Sequencing |
Use Scenario: Generates auxiliary 3.3 V rail for door module MCUs, LIN transceivers, and LED drivers in harsh electrical environments. IC Role / Device Role / Timing Role: Robust buck converter with thermal shutdown, hiccup-mode short-circuit protection, and input UVLO - sustains operation during cranking and load-dump events. Use Value: 0.2 V dropout at 0.6 A load ensures continuous regulation during low-battery conditions - prevents unexpected MCU resets during engine start. | Use Scenario: Provides always-on 3.3 V supply for infotainment system real-time clocks, CAN wake-up controllers, and memory retention circuits. IC Role / Device Role / Timing Role: Ultra-low-IQ (24 µA) regulator supporting extended vehicle sleep modes while maintaining precise voltage accuracy (±1.5%). Use Value: Reduces parasitic drain below 30 µA - extends battery hold-up time beyond 30 days without recharge, meeting OEM quiescent current targets. |
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 | Same 3.3 V fixed output, but includes forced PWM (FPWM) mode - disables PFM, ensuring constant 2.1 MHz switching regardless of load. | Suitable where variable frequency in PFM could interfere with sensitive analog circuits or cause audible noise in proximity sensors. | Select LMR34206FSC3RNXRQ1 when deterministic switching frequency is required; otherwise LMR34206SC3QRNXRQ1 offers superior light-load efficiency. |
| LMR33620QRNXRQ1 | Higher 2 A output capability, 36 V max input, same 2.1 MHz frequency and VQFN-HR package - but requires external feedback resistors for 3.3 V configuration. | Used where future scalability to higher current or multi-rail designs is anticipated - pin-compatible footprint enables drop-in upgrade path. | Choose LMR33620QRNXRQ1 if system power demand may exceed 0.6 A or if design reuse across multiple platforms is prioritized. |
Compared with LMR34206FSC3RNXRQ1, the LMR34206SC3QRNXRQ1 trades deterministic frequency for 24 µA light-load IQ and automatic mode switching; versus LMR33620QRNXRQ1, it provides lower-cost, resistorless 3.3 V regulation at reduced current capacity - optimizing for size, EMI, and quiescent power in space-constrained ADAS nodes.
Availability
LMR34206SC3QRNXRQ1 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 LMR34206SC3QRNXRQ1 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 ICs and functional safety-compliant design.
The LMR34206-Q1 product line delivers ultra-small, low-EMI synchronous buck converters optimized for automotive ADAS, infotainment, and body electronics - emphasizing AEC-Q100 qualification, spread-spectrum operation, and HotRod™ packaging for robust, space-efficient power delivery.
FAQ
What is the maximum output current capability of the LMR34206SC3QRNXRQ1?
The LMR34206SC3QRNXRQ1 delivers up to 0.6 A of continuous output current across its full operating temperature range (–40°C to +125°C ambient). This rating is validated under recommended PCB layout conditions with adequate thermal dissipation. Peak current capability is limited by internal high-side (0.8–1.2 A) and low-side (0.6–0.95 A) current limits, with hiccup-mode protection engaging during sustained overloads or short circuits.
Does the LMR34206SC3QRNXRQ1 require external feedback resistors to set the output voltage?
No, the LMR34206SC3QRNXRQ1 does not require external feedback resistors. It is a fixed-output variant configured for 3.3 V with ±1.5% tolerance, internally connecting the FB pin to the regulated output. This eliminates resistor matching errors, temperature drift, and layout sensitivity - simplifying design and improving long-term voltage accuracy compared to adjustable buck regulators.
How does the LMR34206SC3QRNXRQ1 achieve CISPR25 Class 5 EMI compliance?
The LMR34206SC3QRNXRQ1 achieves CISPR25 Class 5 compliance through three integrated techniques: (1) HotRod™ flip-chip packaging that minimizes switch-node ringing, (2) parallel input current paths that reduce parasitic inductance, and (3) built-in spread-spectrum modulation (±4% at 16 kHz) that lowers peak radiated emissions. No additional EMI filters or shielding are required in typical layouts.
What is the purpose of the NC pin on the LMR34206SC3QRNXRQ1?
The NC (No Connect) pin on the LMR34206SC3QRNXRQ1 is internally unconnected but assigned to simplify PCB routing - specifically, it serves as a dedicated pad to connect the CBOOT capacitor to the SW pin. Routing CBOOT through this pin instead of directly from BOOT to SW improves layout symmetry, reduces trace inductance, and enhances bootstrap capacitor effectiveness during high-side FET switching.
Can the LMR34206SC3QRNXRQ1 operate with an input voltage as low as 4.2 V?
Yes, the LMR34206SC3QRNXRQ1 is fully operational down to 4.2 V input, which corresponds to automotive cold-crank conditions. At this minimum VIN, it maintains regulation of the 3.3 V output with up to 0.6 A load and exhibits only 0.2 V dropout (typical). Its internal 5-V VCC LDO remains functional, and all protections - including thermal shutdown and current limiting - remain active across the entire 4.2–42 V input range.
LMR34206SC3QRNXRQ1 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)
LMR34206SC3QRNXRQ1 FAQ
1.How can I place an order for LMR34206SC3QRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206SC3QRNXRQ1 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 LMR34206SC3QRNXRQ1 reliable?
The price and inventory of LMR34206SC3QRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206SC3QRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206SC3QRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206SC3QRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206SC3QRNXRQ1?
LMR34206SC3QRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206SC3QRNXRQ1 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 LMR34206SC3QRNXRQ1?
For technical support, including LMR34206SC3QRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206SC3QRNXRQ1 requirements.
6.How does Aetrix verify that LMR34206SC3QRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206SC3QRNXRQ1 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 LMR34206SC3QRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206SC3QRNXRQ1?
All LMR34206SC3QRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206SC3QRNXRQ1, 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 LMR34206SC3QRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34206SC3QRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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