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Texas Instruments LMR34206SC5QRNXTQ1
- Part No.:
- LMR34206SC5QRNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34206SC5QRNXTQ1.pdf
- Description:
- IC REG BUCK 5V 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
LMR34206SC5QRNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 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, and ±1.5% reference voltage tolerance. It integrates high-side and low-side MOSFETs in a 2-mm × 3-mm VQFN-HR package and is deployed in ADAS camera modules for stable power under automotive transients.
For engineers reviewing the LMR34206SC5QRNXTQ1 datasheet, LMR34206SC5QRNXTQ1 pinout, LMR34206SC5QRNXTQ1 application, or LMR34206SC5QRNXTQ1 equivalent, key selection criteria include its 24 µA quiescent current in PFM mode, CISPR25 Class 5 EMI compliance, thermal shutdown at 170°C, and precision enable thresholds enabling direct VIN connection or external UVLO control.
Technical Context
The LMR34206SC5QRNXTQ1 uses peak-current-mode control with internal loop compensation, eliminating external compensation components. Its auto-mode operation dynamically switches between PWM (constant 2.1-MHz frequency) and PFM (diode-emulation burst mode) based on load, maintaining high efficiency across 0–0.6 A.
It features a HotRod™ flip-chip VQFN-HR package minimizing switch-node ringing and parasitic inductance via parallel input paths and spread-spectrum modulation. The integrated power-good flag includes built-in 140-µs deglitch delay and 93–95% falling threshold relative to FB voltage for reliable system supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 42 V - supports wide automotive battery rail including cold-crank (4.2 V) and load-dump (42 V) conditions. |
| Output Voltage | Fixed 5 V ±1% - eliminates external feedback resistors; regulated to ±1.5% reference tolerance over temperature. |
| Max Output Current | 0.6 A - sustained delivery with thermal shutdown at 170°C and hiccup-mode short-circuit protection. |
| Switching Frequency | 2.1 MHz (±6.7%) - enables compact magnetics and avoids AM radio band; spread spectrum reduces peak EMI by ±4%. |
| Quiescent Current | 24 µA (typ.) in PFM - extends battery life in always-on automotive systems such as camera wake-up circuits. |
| EMI Performance | CISPR25 Class 5 compliant - achieved via HotRod™ package, minimized switch-node ringing, and parallel input path layout. |
| Enable Threshold | 1.231 V (typ.) rising, 45 mV hysteresis - allows direct VIN connection or precise external UVLO using resistor divider. |
Pinout & Package
LMR34206SC5QRNXTQ1 is housed in a 12-pin VQFN-HR (RNX) package measuring 2.00 mm × 3.00 mm with wettable flanks for automated optical inspection. Thermal resistance is RθJA = 72.5°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 2, 10) | Power input | Main input supply path; requires short, wide traces to CIN to minimize parasitic inductance. |
| PGND (Pins 1, 11) | Power ground | High-current return path for input capacitor and power stage; must be connected to AGND and system ground. |
| EN (Pin 9) | Enable control | Digital input with precision thresholds (1.231 V ON, 1.186 V OFF); can be tied directly to VIN or driven externally. |
| BOOT (Pin 4) | Bootstrap supply | Provides gate drive voltage for high-side MOSFET; requires 100-nF ceramic capacitor to SW pin. |
| SW (Pin 12) | Switch node | Connection point for power inductor; routed to NC pad on PCB to simplify CBOOT placement. |
| FB (Pin 7) | Feedback input | Monitors regulated 5-V output via internal resistor divider; must not be floated or grounded. |
| AGND (Pin 6) | Analog ground | Reference for internal references and error amplifier; separate from PGND but connected on PCB. |
| VCC (Pin 5) | Internal LDO output | 5-V internal supply for control circuitry; decoupled with 1-µF capacitor to AGND; not for external loading. |
| PG (Pin 8) | Power-good flag | Open-drain output indicating regulation status; active-low with 140-µs deglitch; requires external pull-up. |
| NC (Pin 3) | No connect | Internally unconnected; used on PCB to route CBOOT to SW without vias. |
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 in automotive environments. |
| Integrated MOSFETs with low RDS(on) | High-side: 435 mΩ max, low-side: 280 mΩ max - reduces conduction loss and simplifies BOM vs. controller+MOSFET solutions. |
| Ultra-low EMI design | Meets CISPR25 Class 5 without added filtering - enabled by HotRod™ package, minimized switch-node area, and spread-spectrum clocking. |
| Auto PFM/PWM transition | Seamlessly shifts modes at ~100 mA load - maintains >85% efficiency at 1 mA while delivering full 0.6 A in PWM mode. |
| Robust protection suite | Includes cycle-by-cycle current limit, hiccup-mode short-circuit response (94-ms off-time), thermal shutdown (170°C), and input UVLO. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers image sensor and ISP in rear-view or surround-view cameras exposed to engine bay temperatures and load-dump events. IC Role / Device Role / Timing Role: Primary 5-V power rail regulator with fast transient response and thermal resilience. Use Value: Delivers stable 5-V output during cold-crank (4.2 V input) and load-dump (42 V input), ensuring uninterrupted video capture. | Use Scenario: Supplies display driver IC and microcontroller in windshield-projected HUD units requiring low-noise, compact power. IC Role / Device Role / Timing Role: Fixed-output buck converter with ultra-low EMI to prevent interference with projection optics and sensor signals. Use Value: CISPR25 Class 5 compliance eliminates need for external EMI filters, reducing solution size and cost. |
| Body Control Module (BCM) | Automotive Infotainment Power Rail |
Use Scenario: Provides auxiliary 5-V rail for door module microcontrollers, LIN transceivers, and LED drivers in harsh vehicle environments. IC Role / Device Role / Timing Role: Automotive-grade synchronous buck with precision enable and power-good signaling for system sequencing. Use Value: 24 µA quiescent current extends battery life during vehicle sleep mode; PG flag enables safe MCU reset on undervoltage. | Use Scenario: Generates clean 5-V supply for USB-C PD controllers and audio codecs in center-stack infotainment head units. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC converter supporting dynamic load steps from standby to full multimedia operation. Use Value: Peak-current-mode control ensures <1% output deviation during 100-mA to 0.6-A load transients, preserving audio fidelity. |
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 |
|---|---|---|---|
| LMR34206SC3QRNXTQ1 | Identical package, pinout, and specs except fixed 3.3-V output instead of 5 V. | Used where 3.3-V logic rails dominate (e.g., MCU core supplies), not 5-V peripherals. | Select when system requires 3.3 V; no layout change needed, but feedback network is internal and non-adjustable. |
| LMR36015QRNXTQ1 | 60-V input rating, 0.6-A output, same 2-mm × 3-mm VQFN-HR package and pin-compatible footprint. | Suitable for higher-voltage automotive subsystems (e.g., HVAC, lighting) requiring extended input range beyond 42 V. | Choose for future-proofing against >42-V transients; shares layout and enable/PG functionality but has higher RDS(on). |
Compared with LMR34206SC5QRNXTQ1, the 3.3-V variant offers identical performance in lower-voltage domains, while the LMR36015QRNXTQ1 extends input capability to 60 V at the cost of slightly reduced light-load efficiency - both retain HotRod™ EMI advantages and AEC-Q100 Grade 1 qualification.
Availability
LMR34206SC5QRNXTQ1 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 LMR34206SC5QRNXTQ1 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, EMI-optimized synchronous buck converters for space-constrained automotive applications, emphasizing AEC-Q100 reliability, simplified layout, and scalable voltage/current options.
FAQ
What is the maximum input voltage rating for the LMR34206SC5QRNXTQ1?
The LMR34206SC5QRNXTQ1 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.2 V to 42 V. This accommodates automotive cold-crank (down to 4.2 V) and load-dump (up to 42 V) conditions while maintaining safe margin below the 45-V stress limit specified in the Absolute Maximum Ratings table.
Does the LMR34206SC5QRNXTQ1 require external compensation components?
No, the LMR34206SC5QRNXTQ1 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 - a key advantage over externally compensated buck controllers.
Can the LMR34206SC5QRNXTQ1 operate in forced PWM mode?
No, the LMR34206SC5QRNXTQ1 operates in auto mode only - automatically transitioning between PFM (at light loads) and PWM (at heavy loads). The SC5 variant does not support forced PWM (FPWM); that feature is available only in F-series variants like LMR34206FSC5RNXTQ1.
What is the purpose of the NC pin on the LMR34206SC5QRNXTQ1?
The NC pin (Pin 3) on the LMR34206SC5QRNXTQ1 is internally unconnected and serves a PCB layout function: it provides a convenient routing pad to connect the CBOOT capacitor directly to the SW pin without requiring vias, simplifying high-frequency bootstrap loop implementation and reducing parasitic inductance.
How does the power-good (PG) flag behave during startup of the LMR34206SC5QRNXTQ1?
During startup, the LMR34206SC5QRNXTQ1 asserts the PG flag high approximately 4 ms after EN is enabled, following internal soft-start completion. The flag remains low until VOUT reaches 95% of nominal (4.75 V) and stays high as long as output stays within 93–107% of 5 V, with 140-µs deglitch filtering to reject transient excursions.
LMR34206SC5QRNXTQ1 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)
LMR34206SC5QRNXTQ1 FAQ
1.How can I place an order for LMR34206SC5QRNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34206SC5QRNXTQ1 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 LMR34206SC5QRNXTQ1 reliable?
The price and inventory of LMR34206SC5QRNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34206SC5QRNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR34206SC5QRNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34206SC5QRNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34206SC5QRNXTQ1?
LMR34206SC5QRNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34206SC5QRNXTQ1 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 LMR34206SC5QRNXTQ1?
For technical support, including LMR34206SC5QRNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34206SC5QRNXTQ1 requirements.
6.How does Aetrix verify that LMR34206SC5QRNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34206SC5QRNXTQ1 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 LMR34206SC5QRNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR34206SC5QRNXTQ1?
All LMR34206SC5QRNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34206SC5QRNXTQ1, 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 LMR34206SC5QRNXTQ1 part is unused and in its original packaging.
Return procedure for LMR34206SC5QRNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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