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Texas Instruments LMR34206SC5QRNXRQ1
- Part No.:
- LMR34206SC5QRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206SC5QRNXRQ1.pdf
- Description:
- IC REG BUCK 5V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR34206SC5QRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 0.6 A at 5 V fixed output, operating from 4.2 V to 42 V input, with 2.1-MHz switching frequency, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs. It serves as a compact, low-EMI power supply for automotive ADAS camera modules.
For engineers reviewing the LMR34206SC5QRNXRQ1 datasheet, LMR34206SC5QRNXRQ1 pinout, LMR34206SC5QRNXRQ1 application, or LMR34206SC5QRNXRQ1 equivalent, key selection considerations include its HotRod™ VQFN-HR package for EMI reduction, precision enable thresholds (VEN-VOUT-H = 1.231 V), power-good flag with 140-µs deglitch delay, and PFM/PWM auto-mode operation for wide-load efficiency optimization.
Technical Context
The LMR34206SC5QRNXRQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode transitions between PWM (constant 2.1 MHz) at heavy loads and PFM with diode emulation at light loads, achieving 24 µA non-switching quiescent current.
It integrates protection features including cycle-by-cycle current limit (ISC = 1 A typ.), hiccup short-circuit response (tHC = 94 ms), thermal shutdown (TSD = 170°C), and input UVLO. The device employs a flip-chip HotRod™ structure to minimize switch-node ringing and parasitic inductance, meeting CISPR-25 Class 5 EMI standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 42 V - supports direct connection to automotive battery rails including cold-crank (4.2 V) and load-dump (42 V) conditions. |
| Output Voltage | 5 V fixed - eliminates need for external feedback resistors; regulated to ±1.5% over temperature and line/load. |
| Max Output Current | 0.6 A - sufficient for powering image sensors, SerDes interfaces, and microcontrollers in compact ADAS modules. |
| Switching Frequency | 2.1 MHz - enables use of small external inductors (e.g., 2.2 µH) and reduces solution footprint. |
| Quiescent Current | 24 µA (typ.) - maintains high light-load efficiency in always-on automotive subsystems. |
| Thermal Shutdown | 170°C junction - protects against sustained overload or poor PCB thermal design while allowing recovery at 158°C. |
| EMI Compliance | CISPR-25 Class 5 - meets stringent automotive radiated emissions requirements without added filtering. |
Pinout & Package
LMR34206SC5QRNXRQ1 is housed in a 2.00 mm × 3.00 mm, 12-pin VQFN-HR (RNX) package with wettable flanks for automated optical inspection (AOI). The HotRod™ flip-chip construction minimizes bond-wire inductance and improves thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main input supply rail (4.2–42 V); requires low-inductance connection to CIN and PGND. |
| EN | Enable Control | Logic-level input with precision thresholds (1.231 V turn-on); supports direct VIN tie or external UVLO divider. |
| BOOT | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET; must be connected via 100-nF capacitor to SW. |
| SW | Switch Node | Connection point for external inductor; carries high dV/dt switching waveform; routed with minimal loop area. |
| FB | Feedback Input | Monitors regulated 5 V output via internal resistor divider; not used in fixed-output variants but internally connected. |
| AGND | Analog Ground | Reference ground for internal references and error amplifier; must be tied to system ground with low-impedance path. |
| VOUT | Output Terminal | Regulated 5 V output; connects to COUT and load; no external feedback required due to fixed-voltage configuration. |
| PG | Power-Good Flag | Open-drain output indicating regulation status (high = OK); includes 140-µs deglitch filter and valid down to VIN ≥ 2 V. |
| PGND | Power Ground | High-current return path for VIN, SW, and CIN; must be joined to AGND at single point near IC. |
| VCC | Internal LDO Output | 5-V internal supply for control circuitry; decoupled with 1-µF capacitor; not intended for external loading. |
| NC | No Connect | Internally unconnected pin; 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 and –40°C to +150°C junction temperature - suitable for under-hood and cabin-mounted automotive electronics. |
| HotRod™ VQFN-HR Package | Reduces switch-node ringing and EMI by eliminating bond wires; enables smallest package-to-die ratio among comparable 42-V buck regulators. |
| Auto PFM/PWM Mode | Switches seamlessly between high-efficiency PFM (24 µA IQ) at light loads and stable PWM (2.1 MHz) at full load - eliminates need for manual mode selection. |
| Integrated Power-Good Flag | Provides filtered, delay-compensated system status indication with built-in hysteresis (±2% FB) - removes requirement for external supervisor IC. |
| Pin Compatibility | Shares footprint and pinout with LMR36015/06-Q1 and LMR33620/30-Q1 families - enables scalable power architecture across 0.6 A to 3 A output currents. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor, ISP, and FPD-Link III serializer in compact rear-view or surround-view camera units mounted on vehicle exterior. IC Role / Device Role / Timing Role: Primary 5 V power rail regulator with fast transient response and ultra-low EMI to avoid interference with high-speed video signals. Use Value: Meets CISPR-25 Class 5 emissions limits without ferrite beads or shielding, reducing BOM cost and board space by >30% versus legacy solutions. | Use Scenario: Supplies 5 V to DMD controller, LED driver, and projection optics microcontroller in HUD units embedded in automotive instrument clusters. IC Role / Device Role / Timing Role: Stable, low-noise 5 V source supporting precise timing-critical display refresh and brightness control loops. Use Value: 24 µA quiescent current extends battery runtime during vehicle sleep mode; thermal shutdown prevents overheating in confined dashboard enclosures. |
| Body Control Module (BCM) | Automotive Infotainment Power Sequencing |
Use Scenario: Provides auxiliary 5 V rail for LIN transceivers, door lock actuators, and ambient lighting drivers within centralized BCMs. IC Role / Device Role / Timing Role: Secondary regulated supply derived from main 12 V battery; supports wake-up via EN pin with precise UVLO threshold (1.231 V). Use Value: ±1.5% output tolerance ensures reliable logic-level compatibility across diverse peripherals; PG flag enables safe power sequencing with MCU. | Use Scenario: Generates clean 5 V for USB-C PD controllers, audio codecs, and touch-screen processors in head-unit systems requiring strict power-up/down ordering. IC Role / Device Role / Timing Role: Regulated supply with soft-start (4.5 ms typical) and power-good assertion to coordinate multi-rail initialization. Use Value: Internal soft-start prevents inrush current spikes that could destabilize upstream supplies; PG delay (140 µs) rejects transient noise during startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34206FSC5RNXRQ1 | Same 5 V fixed output, but includes FPWM mode (forced PWM at all loads) instead of auto PFM/PWM. | Better suited for noise-sensitive applications requiring constant-frequency operation (e.g., RF subsystems), at expense of higher light-load IQ (35 µA vs. 24 µA). | Select when deterministic switching frequency is mandatory; avoid if ultra-low standby power is critical. |
| LMR36015SC5QRNXRQ1 | 60 V input rating, 0.6 A output, same 5 V fixed option and VQFN-HR package; higher RDS-ON (HS: 500 mΩ vs. 435 mΩ). | Supports wider input range (up to 60 V) for commercial/industrial 48 V systems; not AEC-Q100 qualified. | Choose only for non-automotive 48 V applications; not drop-in for automotive due to missing AEC-Q100 qualification. |
Compared with LMR34206FSC5RNXRQ1, the LMR34206SC5QRNXRQ1 trades constant-frequency operation for superior light-load efficiency; compared with LMR36015SC5QRNXRQ1, it offers automotive qualification and lower conduction loss at 42 V max, but lacks 48 V system support.
Availability
LMR34206SC5QRNXRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LMR34206SC5QRNXRQ1 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.
The LMR34206-Q1 product line delivers ultra-small, AEC-Q100-qualified buck converters optimized for space-constrained automotive subsystems demanding low EMI, high reliability, and simplified design-in.
FAQ
What is the maximum input voltage rating for the LMR34206SC5QRNXRQ1?
The LMR34206SC5QRNXRQ1 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 robust operation during automotive load-dump events up to 42 V while maintaining regulation down to cold-crank conditions at 4.2 V. Exceeding 45 V may cause permanent damage per the Absolute Maximum Ratings table.
Does the LMR34206SC5QRNXRQ1 require external feedback resistors for 5 V output?
No, the LMR34206SC5QRNXRQ1 is a fixed 5 V output variant - the feedback divider is fully internal. The FB pin is connected internally to the 5 V output node and must not be externally loaded or floated. This eliminates component count and layout sensitivity associated with adjustable-output buck regulators.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR34206SC5QRNXRQ1?
The LMR34206SC5QRNXRQ1 PG pin asserts high after a ~4 ms delay following EN activation, provided output voltage reaches 105% of nominal (5.25 V). It deasserts low during undervoltage (below 93% = 4.65 V), overcurrent, thermal shutdown, or EN deactivation. A built-in 140-µs deglitch filter prevents false triggering from transient load steps. The flag remains functional down to VIN ≥ 2 V.
What is the purpose of the NC pin on the LMR34206SC5QRNXRQ1, and how should it be handled on the PCB?
The NC pin (Pin 3) on the LMR34206SC5QRNXRQ1 is internally unconnected. TI recommends routing the SW node to this pad on the PCB to simplify the physical connection between the CBOOT capacitor and the SW pin - reducing trace inductance and improving bootstrap reliability. It must not be electrically connected to any other net.
Can the LMR34206SC5QRNXRQ1 be used in non-automotive applications?
Yes, the LMR34206SC5QRNXRQ1 can be used in industrial or commercial applications requiring a 4.2–42 V input, 5 V/0.6 A output with low EMI and high efficiency. However, its AEC-Q100 qualification adds cost and test rigor unnecessary for non-automotive use; for such cases, the industrial-grade LMR34206SC5RNXR (non-Q1 suffix) may offer better value without automotive-specific testing.
LMR34206SC5QRNXRQ1 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR34206SC5QRNXRQ1 FAQ
1.How can I place an order for LMR34206SC5QRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206SC5QRNXRQ1 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 LMR34206SC5QRNXRQ1 reliable?
The price and inventory of LMR34206SC5QRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206SC5QRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206SC5QRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206SC5QRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206SC5QRNXRQ1?
LMR34206SC5QRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206SC5QRNXRQ1 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 LMR34206SC5QRNXRQ1?
For technical support, including LMR34206SC5QRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206SC5QRNXRQ1 requirements.
6.How does Aetrix verify that LMR34206SC5QRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206SC5QRNXRQ1 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 LMR34206SC5QRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206SC5QRNXRQ1?
All LMR34206SC5QRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206SC5QRNXRQ1, 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 LMR34206SC5QRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34206SC5QRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR34206SC5QRNXRQ1 Tags
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