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Texas Instruments LMR34215FAQRNXRQ1
- Part No.:
- LMR34215FAQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34215FAQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
LMR34215FAQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1.5 A output across 4.2 V to 42 V input, featuring adjustable output voltage, 400-kHz fixed-frequency operation, ±1.5% reference voltage tolerance, and integrated high-side/low-side MOSFETs in a 2-mm × 3-mm VQFN-HR package. It powers ADAS camera modules and head-up displays where compact size, low EMI, and functional safety support are critical.
For engineers reviewing the LMR34215FAQRNXRQ1 datasheet, LMR34215FAQRNXRQ1 pinout, LMR34215FAQRNXRQ1 application, or LMR34215FAQRNXRQ1 equivalent, key selection considerations include its FPWM-only mode (no PFM), 400-kHz switching frequency, adjustable output configuration, 24 µA quiescent current, and HotRod™ package for CISPR25 Class 5 compliance.
Technical Context
The LMR34215FAQRNXRQ1 implements peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its FPWM operation enforces constant 400-kHz switching across all load conditions, eliminating frequency variation and simplifying EMI filtering design.
It integrates a precision enable input 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. The device uses a flip-chip HotRod™ structure to minimize switch-node ringing and parasitic inductance via parallel input paths.
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) transients. |
| Output Current | 1.5 A continuous - sufficient for powering image sensors, display drivers, and microcontrollers in ADAS subsystems. |
| Switching Frequency | 400 kHz - fixed-frequency FPWM mode enables predictable EMI spectrum placement and simplified filter design. |
| Reference Voltage Accuracy | ±1.5% - ensures tight output regulation over temperature and line/load variations for safety-critical loads. |
| Quiescent Current | 24 µA - minimizes standby power loss in always-on automotive domains such as camera wake-on-motion. |
| Thermal Shutdown | 170°C activation / 158°C recovery - provides robust junction protection during sustained overload or poor PCB thermal design. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added shielding or complex layout. |
Pinout & Package
Package: 12-pin VQFN-HR (RNX), 2.00 mm × 3.00 mm, wettable flanks, flip-chip HotRod™ construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Low-inductance return path for high-current switching; must be connected directly to AGND and CIN ground plane with wide copper. |
| 2, 10 VIN | Main input supply | Accepts 4.2–42 V; requires low-ESR input capacitor placed adjacent to pins 2 and 10 to minimize high-frequency loop inductance. |
| 3 NC | No connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing per TI layout guidance. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor between BOOT and SW pins. |
| 5 VCC | Internal 5-V LDO output | Powers internal control circuitry; decoupled with 1-µF capacitor to AGND; not for external loading. |
| 6 AGND | Analog ground reference | Ground reference for FB, EN, PG; must be star-connected to PGND near IC to avoid noise coupling into feedback path. |
| 7 FB | Feedback input | Monitors output via resistor divider; 1.0 V nominal reference enables precise adjustable output setting (e.g., 3.3 V, 5 V, 12 V). |
| 8 PG | Open-drain power-good flag | Signals valid regulation (high) or fault (low); requires external pullup; asserts low during startup, hiccup, or thermal shutdown. |
| 9 EN | Enable input | Logic-level control with 1.231 V turn-on threshold and 110 mV hysteresis; supports direct VIN connection or external UVLO divider. |
| 12 SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized trace area and separation from sensitive analog signals. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation Support | TI provides FIT data, failure mode analysis, and safety manual to accelerate ISO 26262 ASIL-B system integration. |
| HotRod™ Flip-Chip Packaging | Reduces switch-node ringing and EMI by minimizing bond-wire inductance; enables cleaner waveforms and lower peak emissions. |
| FPWM-Only Operation | Guarantees constant 400-kHz switching regardless of load-critical for deterministic timing in radar/camera synchronization. |
| Integrated Power-Good Flag | Eliminates need for external supervisor IC; built-in 140-µs deglitch and 93–107% FB window prevent false resets during transients. |
| Ultra-Small 2 mm × 3 mm Footprint | Enables < 40 mm² total solution size with minimal external components-ideal for space-constrained ADAS camera modules. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor and ISP in rear-view or surround-view camera systems operating continuously in vehicle cabin environments. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V point-of-load regulator with precise enable sequencing and power-good confirmation before sensor initialization. Use Value: 24 µA quiescent current extends battery life during parking mode; CISPR25 Class 5 compliance avoids interference with RF receivers. | Use Scenario: Supplies DMD or LCoS microdisplay driver and illumination LED bias in windshield-projected HUD units. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter delivering stable 5-V rail with fast transient response to dynamic brightness changes. Use Value: 400-kHz FPWM operation ensures consistent EMI profile across all brightness levels; thermal shutdown protects against enclosed thermal buildup. |
| Body Control Module (BCM) | Automotive Infotainment Power Tree |
Use Scenario: Generates auxiliary 3.3-V or 5-V rails for CAN transceivers, LIN controllers, and door module MCUs in distributed body electronics. IC Role / Device Role / Timing Role: Scalable, pin-compatible POL regulator supporting multiple BCM variants using shared PCB layout. Use Value: Pin compatibility with LMR33620-Q1/LMR33630-Q1 allows platform reuse; AEC-Q100 Grade 1 rating ensures -40°C to +125°C ambient operation. | Use Scenario: Provides clean, regulated 1.8-V or 1.2-V core supply for application processors or audio codecs within central infotainment head units. IC Role / Device Role / Timing Role: Secondary buck stage following primary 5-V rail; leverages adjustable FB to target exact processor core voltage with ±1.5% accuracy. Use Value: Internal compensation eliminates external compensation network; 2.0 × 3.0 mm footprint saves board space in dense multi-rail power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34215FAQRNXTQ1 | Same electrical specs and FPWM 400-kHz operation; differs only in tape-and-reel quantity (250 vs. 3000 units). | Identical functionality; suitable for prototyping or low-volume builds where smaller reels reduce inventory overhead. | Select when evaluating or qualifying the part before committing to full production reels. |
| LMR33630AQDRRRQ1 | 36-V input, 3-A output, 2.1-MHz FPWM; larger 3-mm × 4-mm VQFN package; no spread spectrum. | Better suited for higher-current infotainment SoCs or ADAS domain controllers requiring >1.5 A. | Choose when output current demand exceeds 1.5 A or when 2.1-MHz switching enables smaller magnetics in constrained layouts. |
Compared with LMR34215FAQRNXRQ1, the LMR34215FAQRNXTQ1 offers identical performance in a smaller reel format ideal for validation, while the LMR33630AQDRRRQ1 trades lower current capability for higher output current and faster switching-enabling smaller inductors but requiring more careful EMI mitigation due to lack of spread spectrum.
Availability
LMR34215FAQRNXRQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply, long-term automotive qualification, and AEC-Q100-compliant logistics traceability.
Supply support for LMR34215FAQRNXRQ1 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 and functional safety solutions.
The LMR34215FAQRNXRQ1 belongs to TI's LMR3-Q1 family of ultra-small, AEC-Q100-qualified buck converters designed specifically for space- and noise-sensitive automotive subsystems including vision, lighting, and domain control units.
FAQ
What is the switching frequency of the LMR34215FAQRNXRQ1?
The LMR34215FAQRNXRQ1 operates at a fixed 400-kHz switching frequency in forced PWM (FPWM) mode. Unlike PFM-capable variants, it does not drop into pulse-frequency modulation at light loads-ensuring constant frequency behavior for predictable EMI filtering and timing-critical applications such as synchronized camera exposure control. This frequency is factory-set and non-adjustable.
Does the LMR34215FAQRNXRQ1 support adjustable output voltage?
Yes, the LMR34215FAQRNXRQ1 supports adjustable output voltage via the FB pin, which has a precise 1.0 V ±1.5% internal reference. By configuring an external resistor divider between VOUT, FB, and AGND, designers can set output voltages such as 3.3 V, 5 V, or 12 V. This variant does not support fixed 5-V output; that function is implemented in separate part numbers like LMR34215SC5QRNXRQ1.
Is the LMR34215FAQRNXRQ1 qualified for automotive use?
Yes, the LMR34215FAQRNXRQ1 is AEC-Q100 Grade 1 qualified, rated for ambient temperatures from –40°C to +125°C and junction temperatures up to +150°C. It includes automotive-specific features including functional safety documentation support, enhanced ESD robustness (HBM ±2500 V), and validated operation under automotive voltage transients (42-V load dump, 4.2-V cold crank). These qualifications are certified and documented by Texas Instruments.
What package type does the LMR34215FAQRNXRQ1 use?
The LMR34215FAQRNXRQ1 uses the VQFN-HR (RNX) package: a 12-pin, 2.00 mm × 3.00 mm wettable-flank quad flat no-lead package with flip-chip HotRod™ construction. This package minimizes parasitic inductance, improves thermal performance (RθJB = 23.3°C/W), and supports automated optical inspection (AOI) via solderable flanks-making it suitable for high-reliability automotive PCB assembly.
How does the power-good (PG) flag behave on the LMR34215FAQRNXRQ1?
The LMR34215FAQRNXRQ1's open-drain PG pin asserts high when output voltage is within 93–107% of the target (e.g., 4.65–5.35 V for 5 V), with a built-in 140-µs deglitch delay to reject transient excursions. It goes low during startup, thermal shutdown, current-limit hiccup, or EN deactivation. When EN is pulled low, PG remains valid down to VIN ≥ 2 V. An external pullup resistor (to VCC or VOUT) is required; grounding PG disables the function.
LMR34215FAQRNXRQ1 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 400kHz
- 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)
LMR34215FAQRNXRQ1 FAQ
1.How can I place an order for LMR34215FAQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34215FAQRNXRQ1 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 LMR34215FAQRNXRQ1 reliable?
The price and inventory of LMR34215FAQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34215FAQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34215FAQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34215FAQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34215FAQRNXRQ1?
LMR34215FAQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34215FAQRNXRQ1 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 LMR34215FAQRNXRQ1?
For technical support, including LMR34215FAQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34215FAQRNXRQ1 requirements.
6.How does Aetrix verify that LMR34215FAQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34215FAQRNXRQ1 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 LMR34215FAQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34215FAQRNXRQ1?
All LMR34215FAQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34215FAQRNXRQ1, 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 LMR34215FAQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34215FAQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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