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Texas Instruments LMR34206FSC3RNXRQ1
- Part No.:
- LMR34206FSC3RNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206FSC3RNXRQ1.pdf
- Description:
- IC REG BUCK 3.3V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR34206FSC3RNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 0.6 A at 3.3 V fixed 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 automotive ADAS camera and HUD power rails.
For engineers reviewing the LMR34206FSC3RNXRQ1 datasheet, LMR34206FSC3RNXRQ1 pinout, LMR34206FSC3RNXRQ1 application, or LMR34206FSC3RNXRQ1 equivalent, key selection criteria include its HotRod™ VQFN-HR (12) package with wettable flanks, spread-spectrum EMI reduction, PFM/PWM auto-mode efficiency optimization, and precision enable with built-in power-good flag for system supervision.
Technical Context
The LMR34206FSC3RNXRQ1 employs peak-current-mode control with internal loop compensation, enabling stable regulation across 4.2–42 V input while supporting both forced PWM (FPWM) and automatic PFM/PWM transition modes. Its valley current limit and hiccup short-circuit protection respond to FB voltage dropping below 0.4 V, with thermal shutdown at 170°C and recovery at 158°C.
It integrates a 5-V internal LDO (VCC), open-drain power-good flag with 80–200 µs deglitch delay and ±2% hysteresis, and precision enable thresholds (VEN-VOUT-H = 1.157–1.3 V, VEN-VOUT-HYS = 45–175 mV) for reliable start-up sequencing in automotive environments.
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 | 3.3 V fixed - eliminates external feedback resistor network, reducing BOM count and layout sensitivity. |
| Max Output Current | 0.6 A - sufficient for powering image sensors, FPGAs, and microcontrollers in compact ADAS modules. |
| Switching Frequency | 2.1 MHz (±7%) - enables use of small external inductors and capacitors, minimizing solution footprint. |
| Quiescent Current | 24 µA typical - maintains high light-load efficiency in always-on vehicle subsystems without compromising standby power. |
| Reference Tolerance | ±1.5% - ensures tight output regulation across temperature and line/load variations for safety-critical functions. |
| EMI Performance | CISPR-25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added filtering. |
Pinout & Package
LMR34206FSC3RNXRQ1 is housed in a 2.00 mm × 3.00 mm VQFN-HR (12-pin) package with wettable flanks for automated optical inspection (AOI) and enhanced thermal performance. The HotRod™ flip-chip construction minimizes parasitic inductance, reducing switch-node ringing and improving EMI behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main input supply connection (pins 2, 10); requires low-inductance path to CIN for transient robustness. |
| 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 | Bootstrap Supply | Connects 100-nF capacitor to SW; supplies gate drive for high-side MOSFET during switching cycles. |
| SW | Switch Node | Connection point for power inductor; high dv/dt node requiring minimized trace area and guard ring. |
| FB | Feedback Input | Direct connection to output voltage divider tap (not used for fixed 3.3 V version); must not be floated or grounded. |
| AGND | Analog Ground | Reference for internal references and error amplifier; separate from PGND but tied at single point on PCB. |
| VOUT | Output Terminal | Regulated 3.3 V output (pin 8); connects to COUT and load; PG pin monitors this rail via internal comparator. |
| PG | Power-Good Flag | Open-drain output asserting high when VOUT is within 93–107% of nominal; includes 80–200 µs glitch filter. |
| PGND | Power Ground | High-current return path for VIN, SW, and CIN; must be connected to AGND at single point near device. |
| VCC | Internal LDO Output | 5-V regulated supply for internal circuitry; decoupled with 1-µF capacitor; not intended for external loads. |
| CBOOT | Bootstrap Capacitor Pad | Not a pin - external 100-nF capacitor placed between BOOT and SW pins per layout guidelines. |
| NC | No Connect | Pin 3 and pin 11 are unconnected internally; used on PCB to simplify CBOOT-to-SW routing. |
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 - suitable for under-hood and cabin-mounted automotive electronics. |
| HotRod™ VQFN-HR package | Reduces switch-node ringing and EMI by minimizing bond-wire inductance; enables CISPR-25 Class 5 compliance without shielding. |
| Integrated power MOSFETs | Eliminates external high-side/low-side switches; RDS(on) of 225–435 mΩ (HS) and 150–280 mΩ (LS) reduces conduction losses and simplifies thermal design. |
| Spread-spectrum modulation | ±4% frequency dithering at 16 kHz repetition rate lowers peak radiated emissions - critical for camera module EMC certification. |
| Auto PFM/PWM mode transition | Maintains >85% efficiency at 1 mA load (PFM) and >92% at 0.6 A (PWM), optimizing power conversion across dynamic ADAS workloads. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor, ISP, and interface logic in forward-facing driver-assistance cameras exposed to wide temperature and voltage transients. IC Role / Device Role / Timing Role: Primary 3.3-V power rail regulator with fast transient response and low noise to prevent image artifacts and timing jitter. Use Value: 2.1-MHz switching and integrated MOSFETs enable <10-mm² solution size; spread spectrum avoids interference with high-speed MIPI CSI-2 video links. | Use Scenario: Supplies display controller, DMD/LCoS driver, and illumination LED bias in windshield-projected HUD systems requiring ultra-low EMI. IC Role / Device Role / Timing Role: Fixed 3.3-V source with power-good flag enabling safe boot sequencing and fault reporting to vehicle domain controller. Use Value: CISPR-25 Class 5 compliance eliminates need for ferrite beads or metal shields; wettable flanks support AOI for zero-defect manufacturing. |
| Body Control Module (BCM) | General Purpose Wide VIN Power Supply |
Use Scenario: Provides auxiliary 3.3-V rail for LIN gateway MCU, CAN transceiver, and sensor interfaces in centralized vehicle body electronics. IC Role / Device Role / Timing Role: Robust input stage handling 42-V load-dump events while maintaining regulation during cranking (down to 4.2 V). Use Value: Thermal shutdown (170°C) and hiccup-mode short-circuit protection ensure fail-safe operation during wiring faults or connector shorts. | Use Scenario: Serves as scalable, pin-compatible buck solution for industrial IoT gateways, telematics units, and infotainment head units with 12/24/42-V battery inputs. IC Role / Device Role / Timing Role: Drop-in replacement for LMR36015/06-Q1 and LMR33620/30-Q1 families - simplifies platform power architecture migration. Use Value: Identical 2×3-mm VQFN-HR footprint and pinout allows reuse of PCB layout across 0.6–3-A output variants, reducing NRE and time-to-market. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34206FSC5RNXRQ1 | 5-V fixed output instead of 3.3 V; identical input range, frequency, package, and features. | Used where downstream logic requires 5-V I/O compatibility rather than 3.3-V core supply. | Select when system architecture mandates 5-V rail - no layout or firmware changes needed beyond output capacitor adjustment. |
| LMR36015FSC3RNXRQ1 | 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 ECUs or systems requiring extended input transient immunity beyond ISO 7637-2 Pulse 5a. | Choose for future-proofing or when scaling output current is anticipated - retains identical pinout and layout compatibility. |
Compared with LMR34206FSC3RNXRQ1, the 5-V variant offers identical performance in all parameters except output voltage, while the 60-V/1.5-A alternative extends input ruggedness and output capability without altering PCB footprint or control interface - enabling modular power design across vehicle platforms.
Availability
LMR34206FSC3RNXRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for LMR34206FSC3RNXRQ1 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 solutions.
The LMR34206FSC3RNXRQ1 belongs to TI's LMR3-Q1 family of ultra-small synchronous buck converters, designed specifically for space-constrained, EMI-sensitive automotive subsystems such as vision processing, digital cockpit, and domain controllers.
FAQ
What is the input voltage range supported by the LMR34206FSC3RNXRQ1?
The LMR34206FSC3RNXRQ1 supports an input voltage range of 4.2 V to 42 V, making it suitable for 12-V and 24-V automotive battery systems including cold-crank (down to 4.2 V) and load-dump (up to 42 V) conditions. This range is validated per AEC-Q100 and aligns with ISO 16750-2 specifications for automotive electrical environments.
Does the LMR34206FSC3RNXRQ1 require external feedback resistors?
No, the LMR34206FSC3RNXRQ1 is a fixed 3.3-V output variant and does not require external feedback resistors. The FB pin is internally connected to the reference; it must not be floated or grounded. This simplifies design, improves accuracy, and reduces component count compared to adjustable-output regulators.
How does the power-good (PG) flag function on the LMR34206FSC3RNXRQ1?
The LMR34206FSC3RNXRQ1 PG pin is an open-drain output that asserts high when VOUT is within 93–107% of 3.3 V, with 80–200 µs deglitch delay to suppress transients. It goes low during startup until soft-start completes (~4 ms), during EN deactivation, or under fault conditions like overcurrent or thermal shutdown - providing reliable system supervision without external circuitry.
What packaging and assembly advantages does the LMR34206FSC3RNXRQ1 offer?
The LMR34206FSC3RNXRQ1 uses a 2.00 mm × 3.00 mm VQFN-HR package with wettable flanks, enabling automated optical inspection (AOI) for solder-joint quality verification. Its HotRod™ flip-chip construction minimizes parasitic inductance, reducing EMI and improving efficiency - critical for high-reliability automotive manufacturing.
Is the LMR34206FSC3RNXRQ1 pin-compatible with other devices in the LMR3-Q1 family?
Yes, the LMR34206FSC3RNXRQ1 is pin-compatible with LMR36015/06-Q1 (60 V, 0.6/1.5 A) and LMR33620/30-Q1 (36 V, 2/3 A) families. Identical VQFN-HR (12) footprint and pin assignments allow shared PCB layouts across output current and input voltage variants - accelerating platform development and reducing qualification effort.
LMR34206FSC3RNXRQ1 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)
LMR34206FSC3RNXRQ1 FAQ
1.How can I place an order for LMR34206FSC3RNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206FSC3RNXRQ1 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 LMR34206FSC3RNXRQ1 reliable?
The price and inventory of LMR34206FSC3RNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206FSC3RNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206FSC3RNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206FSC3RNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206FSC3RNXRQ1?
LMR34206FSC3RNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206FSC3RNXRQ1 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 LMR34206FSC3RNXRQ1?
For technical support, including LMR34206FSC3RNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206FSC3RNXRQ1 requirements.
6.How does Aetrix verify that LMR34206FSC3RNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206FSC3RNXRQ1 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 LMR34206FSC3RNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206FSC3RNXRQ1?
All LMR34206FSC3RNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206FSC3RNXRQ1, 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 LMR34206FSC3RNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34206FSC3RNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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