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Texas Instruments LMR34215FAQRNXTQ1
- Part No.:
- LMR34215FAQRNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34215FAQRNXTQ1.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:335
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Product details
Overview
LMR34215FAQRNXTQ1 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 PWM 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 requiring stable, low-EMI 5-V rails.
For engineers reviewing the LMR34215FAQRNXTQ1 datasheet, LMR34215FAQRNXTQ1 pinout, LMR34215FAQRNXTQ1 application, or LMR34215FAQRNXTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for scalable wide-VIN power design.
Technical Context
The LMR34215FAQRNXTQ1 implements peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its FPWM mode disables diode emulation to enforce continuous conduction mode (CCM) at all loads - critical for noise-sensitive ADAS systems requiring predictable switching frequency and minimized spectral peaks.
This variant integrates a precision enable input (VEN-VOUT-H = 1.157–1.3 V), power-good flag with 80–200 µs deglitch delay and 90–95% lower threshold, and thermal shutdown at 170°C with 12°C hysteresis. The HotRod™ VQFN-HR package minimizes switch-node ringing and parasitic inductance via flip-chip construction and parallel input paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 42 V - supports full automotive battery range including cold-crank (4.2 V) and load-dump (42 V) transients. |
| Output Current | 1.5 A continuous - sufficient for dual-lane MIPI CSI-2 camera sensors with integrated ISP and memory interface. |
| Switching Frequency | 400 kHz (fixed) - enables use of smaller, lower-cost inductors while avoiding AM radio band interference. |
| Reference Voltage Accuracy | ±1.5% - ensures tight output regulation over temperature (–40°C to +125°C TA) and line/load conditions. |
| Quiescent Current | 24 µA (typical) - extends battery life in always-on vehicle subsystems such as rear-view cameras. |
| Thermal Shutdown | 170°C junction - protects against sustained overload or poor PCB thermal design in confined enclosures. |
| EMI Performance | CISPR-25 Class 5 compliant - meets stringent automotive radiated emissions requirements without added filtering. |
Pinout & Package
Package: 12-pin VQFN-HR (RNX), 2.00 mm × 3.00 mm, wettable flanks, exposed thermal pad (PGND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground and AGND with short, wide copper pours to minimize ground bounce. |
| 2, 10 | VIN | Main input supply - requires low-ESR ceramic input capacitor placed within 2 mm of pins to suppress high-frequency ripple. |
| 3 | NC | No internal connection - used on PCB to route CBOOT capacitor to SW pin; simplifies layout and reduces trace inductance. |
| 4 | BOOT | Bootstrap supply - connects to SW via 100-nF X7R capacitor; critical for high-side gate drive integrity during duty cycles >90%. |
| 5 | VCC | Internal 5-V LDO output - powers control circuitry; decoupled with 1-µF ceramic to AGND; not for external loading. |
| 6 | AGND | Analog ground reference - star-point for FB, PG, EN; isolated from noisy PGND except at single-point thermal pad connection. |
| 7 | FB | Feedback input - senses output voltage via resistor divider; 1.0 V nominal reference enables precise adjustable output setting. |
| 8 | PG | Open-drain power-good flag - indicates regulated output with 105–110% upper and 90–95% lower thresholds; requires external pull-up. |
| 9 | EN | Enable input - precision thresholds (1.157–1.3 V turn-on) allow direct VIN connection or programmable UVLO using external divider. |
| 12 | SW | Switch node - connects to power inductor; high dv/dt node requiring minimal trace area and guard ring to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM Operation | Forces constant 400-kHz switching regardless of load - eliminates frequency modulation artifacts in image sensor timing and clock distribution. |
| HotRod™ Package | Flip-chip construction with wettable flanks reduces switch-node ringing by >50% vs. standard QFN - directly lowers CISPR-25 radiated emissions. |
| Integrated Power Good | Built-in filtered PG flag with 80–200 µs deglitch eliminates need for external supervisor IC in camera module power sequencing. |
| AEC-Q100 Grade 1 | Validated for –40°C to +125°C ambient operation with 150°C max junction - suitable for under-hood and headlamp-adjacent placements. |
| Low Quiescent Current | 24 µA non-switching IQ enables <10 µA system standby current when paired with intelligent EN control - meets ISO 16750-2 sleep mode specs. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers 5-MP rolling-shutter CMOS image sensor and ISP in forward-facing driver-assistance camera. IC Role / Device Role / Timing Role: Primary 5-V power rail regulator with precise soft-start and power-good signaling for sensor initialization sequence. Use Value: 400-kHz FPWM avoids beat frequencies with MIPI D-PHY clock; ±1.5% VREF ensures consistent ADC reference for HDR tone mapping. |
Use Scenario: Supplies 3.3-V logic and 5-V laser driver in compact HUD projector unit mounted behind windshield. IC Role / Device Role / Timing Role: Secondary buck stage stepping down from 12-V vehicle bus to isolated 5-V rail for laser diode bias. Use Value: CISPR-25 Class 5 compliance prevents RF interference with HUD's embedded GPS and CAN-FD telemetry links. |
| Body Control Module (BCM) | Automotive Infotainment Display |
Use Scenario: Generates 3.3-V microcontroller core voltage and 5-V USB-C port power in centralized BCM housing. IC Role / Device Role / Timing Role: Scalable wide-VIN regulator sharing layout with LMR33630-Q1 for multi-rail BCM designs. Use Value: Pin compatibility with 36-V/3-A variants allows single PCB design supporting multiple vehicle platforms and power tiers. |
Use Scenario: Provides 5-V backlight and 1.8-V display interface power in 10.25-inch digital instrument cluster with TFT-LCD. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converter operating from 12-V main bus with fast transient response. Use Value: 0.4-V dropout at 1.5-A load maintains regulation during engine cranking; 24-µA IQ extends display-off battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34215SC5QRNXTQ1 | 5-V fixed output, 2.1-MHz switching, spread spectrum enabled | Optimized for space-constrained infotainment displays needing higher frequency and lower EMI | Select when fixed 5-V output and faster transient response are prioritized over adjustable voltage flexibility |
| LMR36015AQDRRTQ1 | 60-V input rating, 1.5-A output, 400-kHz FPWM, same VQFN-HR package | Supports 48-V mild-hybrid architectures and higher-voltage lighting systems | Choose for future-proofing in 48-V vehicle platforms or where extended input range beyond 42 V is required |
Compared with LMR34215FAQRNXTQ1, the SC5 variant trades adjustability and FPWM stability for higher-frequency EMI reduction, while the LMR36015AQDRRTQ1 extends input range to 60 V at identical footprint and control architecture - enabling reuse of thermal layout and feedback network across 12-V and 48-V domains.
Availability
LMR34215FAQRNXTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, head-up displays, and body control modules requiring stable component supply, automotive qualification, and long-term production continuity.
Supply support for LMR34215FAQRNXTQ1 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, embedded processing, and automotive-grade power management solutions, with decades of AEC-Q100 validation expertise.
The LMR34215-Q1 product line delivers ultra-small, high-efficiency synchronous buck converters optimized for automotive ADAS, infotainment, and body electronics - emphasizing EMI robustness, functional safety readiness, and scalable pin-compatible families.
FAQ
What is the switching frequency of the LMR34215FAQRNXTQ1?
The LMR34215FAQRNXTQ1 operates at a fixed 400-kHz switching frequency. This FPWM (Forced Pulse Width Modulation) mode ensures constant frequency regardless of load, eliminating variable-frequency artifacts that could interfere with image sensor clocks or communication interfaces. The frequency is factory-set and not adjustable via external components or pins.
Does the LMR34215FAQRNXTQ1 support adjustable output voltage?
Yes, the LMR34215FAQRNXTQ1 supports adjustable output voltage via the FB pin, using an external resistor divider referenced to its 1.0-V internal feedback voltage. Unlike fixed-output variants (e.g., LMR34215SC5QRNXTQ1), this part has no internal resistor network - enabling precise customization from ~1.0 V to near VIN, subject to minimum on-time constraints.
Is the LMR34215FAQRNXTQ1 qualified for automotive use?
Yes, the LMR34215FAQRNXTQ1 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 functional safety documentation support and meets automotive reliability, ESD (HBM ±2500 V), and EMC (CISPR-25 Class 5) requirements per TI's production test flow.
What package type does the LMR34215FAQRNXTQ1 use?
The LMR34215FAQRNXTQ1 uses the 12-pin VQFN-HR (RNX) package, measuring 2.00 mm × 3.00 mm with wettable flanks and an exposed thermal pad. This HotRod™ flip-chip construction minimizes parasitic inductance, reduces switch-node ringing, and improves thermal performance versus standard QFN packages.
How does the power-good (PG) function work on the LMR34215FAQRNXTQ1?
The LMR34215FAQRNXTQ1 provides an open-drain power-good flag (PG pin) with built-in 80–200 µs deglitch filtering. It asserts high when output voltage reaches 105–110% of target and deasserts low below 90–95%, ensuring reliable system reset signaling. PG remains valid down to 2 V input and is forced low when EN is inactive.
Can the LMR34215FAQRNXTQ1 be used in forced PWM (FPWM) mode only?
Yes - the LMR34215FAQRNXTQ1 is specifically configured for forced PWM operation, disabling diode emulation and maintaining continuous conduction mode (CCM) across all load conditions. This eliminates audible noise and ensures deterministic switching behavior required in timing-critical automotive subsystems.
LMR34215FAQRNXTQ1 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)
LMR34215FAQRNXTQ1 FAQ
1.How can I place an order for LMR34215FAQRNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34215FAQRNXTQ1 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 LMR34215FAQRNXTQ1 reliable?
The price and inventory of LMR34215FAQRNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34215FAQRNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR34215FAQRNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34215FAQRNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34215FAQRNXTQ1?
LMR34215FAQRNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34215FAQRNXTQ1 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 LMR34215FAQRNXTQ1?
For technical support, including LMR34215FAQRNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34215FAQRNXTQ1 requirements.
6.How does Aetrix verify that LMR34215FAQRNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34215FAQRNXTQ1 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 LMR34215FAQRNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR34215FAQRNXTQ1?
All LMR34215FAQRNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34215FAQRNXTQ1, 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 LMR34215FAQRNXTQ1 part is unused and in its original packaging.
Return procedure for LMR34215FAQRNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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