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Texas Instruments LMR34215FSC5RNXTQ1
- Part No.:
- LMR34215FSC5RNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34215FSC5RNXTQ1.pdf
- Description:
- IC REG BUCK 5V 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:368
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Product details
Overview
LMR34215FSC5RNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1.5 A at 5 V fixed output from a 4.2–42 V input, featuring 2.1-MHz switching frequency, spread-spectrum EMI reduction, and integrated high-side/low-side MOSFETs - deployed in ADAS camera modules for compact, low-noise power delivery.
For engineers reviewing the LMR34215FSC5RNXTQ1 datasheet, LMR34215FSC5RNXTQ1 pinout, LMR34215FSC5RNXTQ1 application, or LMR34215FSC5RNXTQ1 equivalent, key selection considerations include its 5-V fixed output with ±1.5% reference tolerance, 24-µA quiescent current in PFM mode, HotRod™ VQFN-HR (12) package with wettable flanks, and functional safety documentation support.
Technical Context
The LMR34215FSC5RNXTQ1 implements peak-current-mode control with auto-transition between PWM and PFM modes, enabling >93% efficiency at 12 VIN/5 VOUT/1 A while maintaining light-load efficiency via diode emulation. Its internal 5-V LDO powers control circuitry and supports PG logic-level sourcing.
It integrates precision enable with hysteresis (110 mV), power-good flag with 140-µs deglitch delay and 93–107% FB threshold window, and thermal shutdown at 170°C with 12°C hysteresis - all qualified across –40°C to +125°C ambient and –40°C to +150°C junction temperature.
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 ±1.5% - eliminates external feedback resistor network, reducing BOM count and layout sensitivity. |
| Switching Frequency | 2.1 MHz (±10%) - enables use of small 1-µH inductors and minimizes solution footprint in space-constrained modules. |
| Quiescent Current | 24 µA (typ.) in non-switching PFM mode - extends battery runtime in always-on vehicle subsystems. |
| Efficiency @ 12 VIN | 93% at 5 V/1 A - reduces thermal stress and simplifies heatsinking in sealed enclosures like camera housings. |
| EMI Performance | CISPR-25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added shielding. |
| Junction Temp Range | –40°C to +150°C - ensures reliable operation under hood-mounted or near-engine placement. |
Pinout & Package
LMR34215FSC5RNXTQ1 uses a 2.0 mm × 3.0 mm VQFN-HR (12-pin) package with wettable flanks for automated optical inspection (AOI) and robust solder-joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground and AGND with short, wide copper traces to minimize noise coupling. |
| 2, 10 | VIN | Main input supply - connects directly to bulk input capacitor (CIN) with low-inductance routing to suppress voltage spikes. |
| 3 | NC | No internal connection - used on PCB to simplify CBOOT-to-SW trace routing; must not be left floating. |
| 4 | BOOT | Bootstrap supply for high-side driver - requires 100-nF ceramic capacitor tied to SW pin for gate drive integrity. |
| 5 | VCC | Internal 5-V LDO output - powers internal logic; decoupled with 1-µF capacitor to AGND; not for external loading. |
| 6 | AGND | Analog ground reference - serves as measurement reference for FB, PG, EN; isolated from noisy PGND at single-point star ground. |
| 7 | FB | Feedback input - internally tied to 5-V reference; unused in fixed-output variant but must remain connected per datasheet. |
| 8 | PG | Open-drain power-good flag - signals valid regulation after soft-start; requires external pull-up resistor to VCC or VOUT. |
| 9 | EN | Enable input - precision thresholds (1.231 V turn-on, 1.157 V turn-off) allow direct VIN connection or external UVLO configuration. |
| 12 | SW | Switch node - connects to power inductor; high dv/dt node requiring tight loop area and minimal parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation | Available FIT data, FMEA reports, and safety analysis templates - accelerates ISO 26262 ASIL-B system certification. |
| HotRod™ Package | Flip-chip construction reduces switch-node ringing and parasitic inductance - critical for meeting CISPR-25 Class 5 emissions. |
| Spread Spectrum Modulation | ±4% frequency dither at 16-kHz repetition rate - lowers peak EMI by spreading energy across bandwidth, easing filter design. |
| Integrated Power-Good Flag | Built-in filtering and 140-µs deglitch delay - eliminates need for external supervisor IC in camera or HUD power sequencing. |
| Auto PFM/PWM Transition | Seamless mode switching at ~100 mA load - maintains >90% efficiency from 1 mA to 1.5 A without manual control intervention. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers image sensor, ISP, and interface circuitry in compact rear-view or surround-view cameras mounted behind rearview mirrors or grilles. IC Role / Device Role / Timing Role: Primary 5-V rail regulator with fast transient response and ultra-low EMI to prevent RF interference with CMOS image sensors. Use Value: 2.1-MHz operation enables <2-mm height solution; spread spectrum ensures compliance with CISPR-25 Class 5 without ferrite beads or shielded inductors. |
Use Scenario: Supplies 5-V logic and display driver ICs in projection-based HUD units embedded in instrument clusters or windshield combiners. IC Role / Device Role / Timing Role: Stable, low-noise 5-V source synchronized to display refresh timing; PG signal triggers display initialization sequence. Use Value: 24-µA quiescent current extends sleep-mode battery life; thermal shutdown at 170°C prevents latch-up during prolonged sunlight exposure. |
| Body Control Module (BCM) | Automotive Infotainment Core Rail |
Use Scenario: Generates 5-V supply for microcontrollers, CAN transceivers, and sensor interfaces in door modules, seat controllers, or lighting ECUs. IC Role / Device Role / Timing Role: Wide-input buck converter supporting 4.2–42 V range - handles cold-crank (4.2 V) and load-dump (42 V) events without external protection. Use Value: AEC-Q100 Grade 1 qualification ensures operation up to +125°C ambient; 0.4-V dropout at 1.5 A maintains regulation during battery sag. |
Use Scenario: Provides clean 5-V rail to SoC I/O, USB PHYs, and audio codecs in head-unit mainboards where EMI-sensitive analog circuits coexist with digital processors. IC Role / Device Role / Timing Role: Low-EMI power stage with minimized switch-node ringing - prevents coupling into audio DAC outputs or RF front-ends. Use Value: HotRod™ package and parallel input path reduce radiated emissions by >10 dBµV/m vs. standard QFN; PG flag enables safe SoC reset during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34215SC5RNXTQ1 | Same 5-V fixed output, 2.1-MHz frequency, and VQFN-HR package - but lacks FPWM mode (spread spectrum only, no forced PWM). | Not suitable when constant-frequency operation is required at light loads (e.g., for EMI spectral shaping in time-critical systems). | Select LMR34215FSC5RNXTQ1 when both spread spectrum and FPWM capability are needed to suppress narrowband peaks while avoiding audible noise. |
| LMR36015QRNXTQ1 | 60-V input rating, 1.5-A output, pin-compatible but higher RDS(on) (HS: 435 mΩ vs. 435 mΩ typ., LS: 280 mΩ vs. 280 mΩ typ.) and lower efficiency at 12 VIN. | Targeted for 24-V/48-V commercial vehicles or industrial systems - over-spec'd for 12-V passenger car applications. | Choose LMR34215FSC5RNXTQ1 for optimized 12-V automotive systems where size, efficiency, and EMI are prioritized over maximum input voltage headroom. |
Compared with LMR34215SC5RNXTQ1, LMR34215FSC5RNXTQ1 adds forced PWM mode for consistent switching frequency under all loads - critical for EMI-controlled environments. Against LMR36015QRNXTQ1, it trades 18-V input headroom for superior thermal performance and smaller solution size in 12-V platforms.
Availability
LMR34215FSC5RNXTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply, automotive-grade traceability, and long-term production continuity.
Supply support for LMR34215FSC5RNXTQ1 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 and embedded processing technologies, with decades of automotive power management innovation and AEC-Q100 process validation expertise.
The LMR34215FSC5RNXTQ1 belongs to TI's LMR3-Q1 family of ultra-small synchronous buck converters - designed specifically for space-constrained, EMI-sensitive automotive subsystems requiring high reliability and functional safety readiness.
FAQ
What is the switching frequency of the LMR34215FSC5RNXTQ1 and is it adjustable?
The LMR34215FSC5RNXTQ1 operates at a factory-set 2.1-MHz switching frequency with ±10% tolerance. It is not user-adjustable - frequency is fixed by internal oscillator and includes ±4% spread-spectrum modulation to reduce peak EMI. This eliminates external timing components and ensures consistent performance across temperature and voltage.
Does the LMR34215FSC5RNXTQ1 require external feedback resistors for its 5-V output?
No, the LMR34215FSC5RNXTQ1 is a fixed 5-V output variant - its feedback reference is internally trimmed to 5.0 V ±1.5%, eliminating the need for external resistors. The FB pin remains connected internally and must not be left floating or grounded per TI's layout guidelines.
How does the power-good (PG) flag on the LMR34215FSC5RNXTQ1 behave during startup and fault conditions?
The LMR34215FSC5RNXTQ1 PG pin is an open-drain output that goes high after soft-start completes (~4 ms delay from EN assertion) and remains high while output voltage stays within 93–107% of 5 V. It pulls low during startup, thermal shutdown, current-limit hiccup, or if input drops below 2 V - providing a true system-ready signal without external supervision.
What thermal protection features does the LMR34215FSC5RNXTQ1 include?
The LMR34215FSC5RNXTQ1 incorporates thermal shutdown at 170°C junction temperature with automatic recovery at 158°C (12°C hysteresis). It also features internal VCC undervoltage lockout (3.3–3.8 V range) and precision enable thresholds to prevent erratic operation during thermal or input voltage transients - all verified across –40°C to +150°C junction range.
Is the LMR34215FSC5RNXTQ1 pin-compatible with other devices in the LMR3-Q1 family?
Yes, the LMR34215FSC5RNXTQ1 shares the same 12-pin VQFN-HR (RNX) package and pinout with LMR36015-Q1, LMR36006-Q1, LMR33630-Q1, and LMR33620-Q1 - enabling scalable power design across 0.6–3 A output currents and 36–60 V input ranges using identical PCB footprints and layout patterns.
LMR34215FSC5RNXTQ1 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:
- 1.5A
- 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)
LMR34215FSC5RNXTQ1 FAQ
1.How can I place an order for LMR34215FSC5RNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34215FSC5RNXTQ1 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 LMR34215FSC5RNXTQ1 reliable?
The price and inventory of LMR34215FSC5RNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34215FSC5RNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR34215FSC5RNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34215FSC5RNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34215FSC5RNXTQ1?
LMR34215FSC5RNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34215FSC5RNXTQ1 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 LMR34215FSC5RNXTQ1?
For technical support, including LMR34215FSC5RNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34215FSC5RNXTQ1 requirements.
6.How does Aetrix verify that LMR34215FSC5RNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34215FSC5RNXTQ1 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 LMR34215FSC5RNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR34215FSC5RNXTQ1?
All LMR34215FSC5RNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34215FSC5RNXTQ1, 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 LMR34215FSC5RNXTQ1 part is unused and in its original packaging.
Return procedure for LMR34215FSC5RNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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