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Texas Instruments LMR34215SC5QRNXRQ1
- Part No.:
- LMR34215SC5QRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR34215SC5QRNXRQ1.pdf
- Description:
- IC REG BUCK 5V 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,974
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Product details
Overview
LMR34215SC5QRNXRQ1 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, operating from 4.2 V to 42 V input, with 2.1-MHz switching frequency, spread-spectrum EMI reduction, and integrated high-side/low-side MOSFETs - deployed in ADAS camera modules and head-up displays.
For engineers reviewing the LMR34215SC5QRNXRQ1 datasheet, LMR34215SC5QRNXRQ1 pinout, LMR34215SC5QRNXRQ1 application, or LMR34215SC5QRNXRQ1 equivalent, key selection criteria include its 5-V fixed output, 2.1-MHz spread-spectrum operation, automotive-grade thermal range (–40°C to +150°C junction), and VQFN-HR 12-pin wettable-flank package for automated optical inspection.
Technical Context
The LMR34215SC5QRNXRQ1 uses peak-current-mode control with internal loop compensation, enabling stable regulation across wide VIN and load ranges without external compensation components. It integrates a 5-V fixed reference, precision enable with hysteresis (110 mV), and a filtered open-drain power-good flag with 140-µs deglitch delay.
Its HotRod™ VQFN-HR package minimizes switch-node ringing via low-parasitic layout and parallel input paths, meeting CISPR-25 Class 5 EMI requirements. The device operates in auto PFM/PWM mode by default but this variant disables PFM (FPWM = No) and enables spread spectrum (Yes), ensuring constant 2.1-MHz operation with reduced peak emissions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 42 V - supports direct battery connection across cold-crank (4.2 V) and load-dump (42 V) transients in 12-V automotive systems. |
| Output Voltage | 5 V fixed ±2% - eliminates external feedback resistors; ensures stable logic supply for microcontrollers and image sensors. |
| Switching Frequency | 2.1 MHz (±6.7%) - enables use of small 1-µH inductors and compact ceramic output capacitors; avoids AM radio band. |
| Efficiency | 93% at 12 VIN/5 VOUT/1 A - reduces thermal load in space-constrained modules like camera ECUs. |
| Quiescent Current | 24 µA typical - extends battery life during vehicle sleep modes without compromising startup responsiveness. |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1; supports under-hood and near-engine placement. |
| EMI Compliance | CISPR-25 Class 5 - meets stringent automotive radiated emission limits without added shielding or ferrites. |
Pinout & Package
VQFN-HR (RNX) 12-pin package, 2.00 mm × 3.00 mm body size, with wettable flanks for solder-joint inspection. Thermal pad exposed on bottom for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switching loops; must be tied directly to AGND and CIN ground plane with short, wide traces. |
| 2, 10 | VIN | Main input supply rail; connects to bulk input capacitor (CIN) with minimal trace inductance to suppress voltage spikes. |
| 3 | NC | No internal connection; used on PCB to route CBOOT capacitor to SW pin - simplifies layout and reduces parasitic inductance. |
| 4 | BOOT | Bootstrap supply for high-side gate driver; requires 100-nF ceramic capacitor connected directly to SW pin. |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry; decoupled with 1-µF capacitor to AGND; not for external loads. |
| 6 | AGND | Analog ground reference for FB, PG, EN; separates noise-sensitive analog circuits from power-ground currents. |
| 7 | FB | Feedback input - internally tied to 5-V reference; left unconnected for fixed-output configuration. |
| 8 | PG | Open-drain power-good flag; asserts high after soft-start when VOUT reaches 105% of target; requires external pull-up resistor. |
| 9 | EN | Enable input with precision thresholds (1.231 V turn-on, 1.157 V turn-off); supports direct VIN connection or external UVLO divider. |
| 12 | SW | Switch node connecting to power inductor; high di/dt node requiring tight layout and minimal copper area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±4% frequency dithering at 16-kHz rate - lowers peak radiated emissions by up to 10 dB without affecting regulation performance. |
| HotRod™ flip-chip packaging | Reduced pin inductance and minimized switch-node ringing - enables clean 2.1-MHz operation with <5% overshoot on SW waveform. |
| Integrated power MOSFETs | 225-mΩ high-side and 150-mΩ low-side RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and solution footprint by >30%. |
| Thermal shutdown & recovery | 170°C shutdown / 158°C hysteresis - protects against sustained overload while allowing automatic recovery once temperature falls below threshold. |
| Power-good flag with filtering | 140-µs deglitch delay and 7% hysteresis - prevents false resets during transient line/load events; eliminates need for external supervisor IC. |
Applications
| ADAS Camera Module | Head-Up Display (HUD) |
|---|---|
Use Scenario: Powers CMOS image sensor, ISP, and interface logic in compact rear-view or surround-view camera ECUs mounted near headlights or bumpers. IC Role / Device Role / Timing Role: Primary 5-V power rail regulator with fast transient response and low-noise operation to prevent image artifacts. Use Value: 2.1-MHz switching avoids interference with sensor clock domains; CISPR-25 Class 5 compliance eliminates need for EMI filters in tight camera housings. |
Use Scenario: Supplies 5-V logic rails for DMD or LCoS microdisplays, timing controllers, and brightness management ICs in dashboard-integrated HUD units. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable, low-ripple 5-V supply synchronized to display frame timing. Use Value: 24-µA quiescent current extends ignition-off battery life; –40°C to +150°C junction rating supports operation behind hot windshield glass. |
| Body Control Module (BCM) | Automotive Infotainment Power Rail |
Use Scenario: Generates 5-V supply for microcontroller, CAN transceivers, and LED drivers in centralized body electronics units located in door sills or footwells. IC Role / Device Role / Timing Role: Wide-input buck regulator handling start-stop cycling and load-dump events while maintaining system uptime. Use Value: 42-V absolute max input withstands 35-V load-dump transients; integrated PG flag enables safe MCU reset sequencing during brownouts. |
Use Scenario: Provides clean 5-V rail for USB-C PD controllers, audio codecs, and touch-screen interface ICs in center-stack infotainment head units. IC Role / Device Role / Timing Role: EMI-optimized DC/DC converter placed near noise-sensitive analog subsystems without shielding. Use Value: Spread-spectrum + HotRod layout achieves <100 µVpp output ripple at 2.1 MHz - prevents audible noise in Class-D amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR34215FSC5RNXRQ1 | Same 5-V fixed output, 2.1-MHz frequency, and VQFN-HR package - but adds FPWM mode (forced PWM at light load). | Required where constant-frequency operation is mandatory (e.g., RF-sensitive zones), accepting ~5% lower light-load efficiency. | Select LMR34215FSC5RNXRQ1 only if PFM-induced frequency variation must be eliminated; otherwise LMR34215SC5QRNXRQ1 offers better efficiency in sleep states. |
| LMR36015QRNXRQ1 | 60-V input rating, 1.5-A output, same 2-mm × 3-mm VQFN-HR package - but fixed 5-V output with no spread spectrum. | Suitable for higher-voltage hybrid/electric vehicle subsystems (e.g., 48-V battery monitoring), but lacks CISPR-25 Class 5 compliance. | Choose LMR36015QRNXRQ1 only when input exceeds 42 V; LMR34215SC5QRNXRQ1 remains optimal for standard 12-V automotive platforms requiring EMI certification. |
Compared with LMR34215FSC5RNXRQ1, LMR34215SC5QRNXRQ1 trades forced-PWM stability for superior light-load efficiency and lower EMI via spread spectrum - making it preferred for battery-sensitive ADAS modules. Against LMR36015QRNXRQ1, it sacrifices 60-V headroom for guaranteed CISPR-25 Class 5 compliance and tighter output tolerance, aligning with mainstream 12-V OEM requirements.
Availability
LMR34215SC5QRNXRQ1 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 LMR34215SC5QRNXRQ1 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 qualification expertise and ISO/TS 16949-certified manufacturing.
The LMR34215-Q1 product line delivers ultra-small, AEC-Q100-qualified synchronous buck converters optimized for space-constrained, EMI-sensitive automotive subsystems - including camera, display, and domain controller power rails.
FAQ
What is the output voltage configuration of the LMR34215SC5QRNXRQ1?
The LMR34215SC5QRNXRQ1 is factory-configured for 5-V fixed output, with ±2% tolerance over temperature and line. Its internal feedback divider eliminates external resistor networks, reducing BOM count and layout complexity. This fixed setting is confirmed in TI's device comparison table and electrical characteristics section (V5v0-Fixed = 4.9 V to 5.1 V).
Does the LMR34215SC5QRNXRQ1 support spread-spectrum operation?
Yes, the LMR34215SC5QRNXRQ1 includes spread-spectrum modulation with ±4% frequency deviation at a 16-kHz repetition rate. This feature is explicitly enabled in its orderable part number ('SC5' suffix denotes spread spectrum + fixed 5-V output) and verified in Section 5 (Device Comparison Table) and Section 7.7 (System Characteristics) of the datasheet.
What is the switching frequency of the LMR34215SC5QRNXRQ1 and how tightly is it controlled?
The LMR34215SC5QRNXRQ1 operates at a nominal 2.1 MHz, with guaranteed range of 1.95 MHz to 2.35 MHz across temperature and process variation. This specification is documented in Section 7.5 (Electrical Characteristics) under FOSC parameter for the 2.1-MHz variant, and reflects the oscillator's inherent accuracy before spread-spectrum dithering.
Is the LMR34215SC5QRNXRQ1 pin-compatible with other devices in the LMR3x215-Q1 family?
No - the LMR34215SC5QRNXRQ1 shares the same VQFN-HR 12-pin package and pinout with all members of the LMR34215-Q1 family (e.g., LMR34215FAQRNXRQ1), but is not pin-compatible with higher-voltage variants like LMR36015-Q1. Pin compatibility is explicitly limited to the LMR34215-Q1 series per Section 1 (Features) and Figure 6-1 (Pin Configuration).
What automotive qualification level does the LMR34215SC5QRNXRQ1 meet?
The LMR34215SC5QRNXRQ1 is AEC-Q100 qualified for Grade 1 operation, supporting ambient temperatures from –40°C to +125°C and junction temperatures up to +150°C. This qualification is stated in the title block, Section 1 (Features), and Section 7.3 (Recommended Operating Conditions), confirming suitability for engine bay–adjacent and cabin-mounted automotive applications.
LMR34215SC5QRNXRQ1 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)
LMR34215SC5QRNXRQ1 FAQ
1.How can I place an order for LMR34215SC5QRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR34215SC5QRNXRQ1 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 LMR34215SC5QRNXRQ1 reliable?
The price and inventory of LMR34215SC5QRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR34215SC5QRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR34215SC5QRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR34215SC5QRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR34215SC5QRNXRQ1?
LMR34215SC5QRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR34215SC5QRNXRQ1 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 LMR34215SC5QRNXRQ1?
For technical support, including LMR34215SC5QRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR34215SC5QRNXRQ1 requirements.
6.How does Aetrix verify that LMR34215SC5QRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR34215SC5QRNXRQ1 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 LMR34215SC5QRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR34215SC5QRNXRQ1?
All LMR34215SC5QRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR34215SC5QRNXRQ1, 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 LMR34215SC5QRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR34215SC5QRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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