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Texas Instruments LMQ66430MC5RXBRQ1
- Part No.:
- LMQ66430MC5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66430MC5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/5V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMQ66430MC5RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 3A output at fixed 5V, operating from 3.0V to 36V input with 42V transient tolerance, integrated VIN bypass and CBOOT capacitors, and optimized for radar ECU and infotainment power rails.
For engineers reviewing the LMQ66430MC5RXBRQ1 datasheet, LMQ66430MC5RXBRQ1 pinout, LMQ66430MC5RXBRQ1 application, or LMQ66430MC5RXBRQ1 equivalent, key selection criteria include its 2.2MHz fixed switching frequency, 1.5µA no-load quiescent current, ZEN 2 low-EMI architecture, and enhanced HotRod QFN-14 (2.6mm × 2.6mm) package with wettable flanks.
Technical Context
The LMQ66430MC5RXBRQ1 uses peak-current-mode control with auto mode enabling frequency foldback below 1mA load, achieving ≥85% efficiency at 1mA and maintaining regulation during 42V load dump transients. Its dual-random spread spectrum (DRSS) and optimized pinout suppress CISPR 25 Class 5 emissions without external chokes.
Integrated 22nF VIN bypass capacitors (series-connected between VIN and PGND), internal 0.1µF bootstrap capacitor, and NC pins between high-voltage nodes reduce layout sensitivity and improve FMEA robustness. The MODE/SYNC pin supports PFM/FPWM selection or external clock synchronization up to 2.5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous DC - supports high-power ADAS sensors and infotainment SoCs without external current boosting. |
| Output Voltage | Fixed 5.00V ±0.6% - eliminates external feedback resistors and ensures stable USB-peripheral or MCU I/O rail compliance. |
| Input Voltage Range | 3.0V–36V (operating), 3.6V–36V (start-up), 42V tolerant - handles cold-crank (3VIN) and load-dump events in 12V/24V automotive systems. |
| Quiescent Current | 1.5µA at 13.5VIN, no load - enables always-on functionality in telematics and eCall modules meeting ISO 16750-2 standby requirements. |
| Switching Frequency | Fixed 2.2MHz - avoids AM band interference and allows use of compact 1µH inductors and ceramic output capacitors. |
| Efficiency @ 1mA | ≥85% at VIN=12V, VOUT=5V - sustains ultra-low-power wake-up states in body control modules without battery drain. |
| Thermal Shutdown | 158°C trip, 20°C hysteresis - protects against sustained overload in enclosed ECU enclosures with limited airflow. |
| Package | VQFN-FCRLF-14 (RXB), 2.6mm × 2.6mm, wettable flanks - enables automated optical inspection and reliable solder joint formation per IPC-A-610. |
Pinout & Package
LMQ66430MC5RXBRQ1 uses the RXB 14-pin enhanced HotRod™ VQFN-FCRLF package (2.6mm × 2.6mm) with exposed thermal pad (GND/DAP) requiring PCB solder connection for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input with precision UVLO | Wakes at 0.7V, starts regulation at 1.23V with 0.35V hysteresis - enables direct connection to microcontroller GPIO or vehicle ignition signal. |
| VIN | Main input supply | Internally connects to two 22nF series bypass capacitors; requires external bulk capacitance only for low-frequency ripple suppression. |
| SW | Power switch node | Connects to inductor; minimized ringing via bond-wire-free HotRod construction and optimized trace routing per layout guidelines. |
| BOOT | Bootstrap supply for HS driver | Internally connected to SW via 0.1µF capacitor - eliminates external boot cap and reduces component count and board area. |
| VOUT/FB | Fixed 5V output / feedback node | Configured as fixed 5V output; no external resistor divider needed - simplifies BOM and improves production yield. |
| MODE/SYNC | Mode selection or clock sync input | Selects PFM/FPWM or synchronizes to external 0.2–2.5MHz clock - prevents beat frequencies in multi-rail systems like head units. |
| PG | Open-drain power-good flag | Asserts after 2.5ms soft-start delay; 100Ω on-resistance supports direct MCU interrupt or reset assertion without pull-up redesign. |
| GND/DAP | Power ground and thermal pad | Must be soldered to solid GND plane - provides primary thermal path (RθJB = 26.2°C/W) and reduces EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| ZEN 2 switcher architecture | Combines dual-random spread spectrum (DRSS), optimized pinout, and bond-wire-free HotRod packaging to meet CISPR 25 Class 5 without common-mode chokes. |
| Integrated capacitors | On-die 22nF VIN bypass (2× series) and 0.1µF CBOOT eliminate 3 external passive components, reducing solution size by >20% and improving EMI consistency across builds. |
| Ultra-low IQ operation | 1.5µA shutdown current and auto-mode frequency foldback enable <10µA system standby in always-on domains such as parking assist controllers. |
| AEC-Q100 Grade 1 qualification | Validated from –40°C to +125°C ambient (–40°C to +150°C junction), supporting under-hood and dashboard mounting without derating. |
| Enhanced FMEA design | NC pins placed between VIN, SW, and BOOT to prevent latent short-circuit failures - achieves best-in-class pin-level fault coverage per ISO 26262 ASIL-B analysis. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring clean, low-noise 5V at up to 2.5A with fast transient response during beam-sweeping cycles. IC Role / Device Role / Timing Role: Primary buck regulator supplying analog front-end and digital baseband sections; delivers regulated 5V with <1% line/load regulation and <100µs transient recovery. Use Value: Integrated DRSS and HotRod packaging eliminate need for ferrite beads or shielding, reducing BOM cost by $0.32/unit and passing CISPR 25 radiated emissions at 10cm. | Use Scenario: Supplies application processor I/O and USB PHY rails in automotive head units where EMI must avoid FM/AM radio bands and thermal density is constrained. IC Role / Device Role / Timing Role: Fixed 5V point-of-load regulator synchronized to system clock via MODE/SYNC pin to avoid heterodyne noise in audio subsystems. Use Value: 2.2MHz fixed frequency places switching harmonics above 20MHz, eliminating interference with touch controller and display timing signals. |
| eCall Module Backup Power | Body Control Module (BCM) Gateway |
Use Scenario: Provides always-on 5V rail for LTE modem and GNSS receiver in eCall systems, operating continuously from vehicle battery with <15µA total system sleep current. IC Role / Device Role / Timing Role: Standby-optimized buck converter with auto mode and 1.5µA IQ - maintains regulation during 3VIN cold-crank while minimizing parasitic drain. Use Value: Internal LDO (VCC) powers external reset supervisor IC, removing discrete LDO and saving 1.2mm² PCB area in space-constrained telematics modules. | Use Scenario: Generates 5V for CAN FD transceivers, LIN interface, and microcontroller peripherals in centralized BCMs exposed to under-dash temperature cycling. IC Role / Device Role / Timing Role: Robust automotive-grade buck converter with 42V load-dump tolerance and –40°C to +125°C ambient rating - ensures uninterrupted gateway operation during jump-start events. Use Value: NC pins between high-voltage nodes and enhanced HotRod thermal pad deliver >2× MTBF improvement vs. standard QFN in vibration-prone body electronics environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460-Q1 | 3.5A rated, 400kHz/2.1MHz selectable, no integrated bypass caps, larger 3mm × 4mm HTSSOP package | Higher current headroom but requires external 22nF bypass caps and larger PCB footprint - suited for non-EMI-critical body modules | Select when higher peak current (>3A) or lower-cost discrete capacitor sourcing is prioritized over minimal EMI design effort. |
| TPS62903-Q1 | 3A rated, 1.8MHz/2.5MHz selectable, no integrated CBOOT or VIN caps, 2mm × 3mm VQFN package | Lacks integrated capacitors and ZEN 2 EMI features - requires full external filter design to meet CISPR 25 Class 5 | Choose when board space is tighter than EMI budget, and design team has proven spread-spectrum layout expertise. |
Compared with LMQ66430MC5RXBRQ1, LM61460-Q1 offers higher current headroom but increases EMI filter complexity, while TPS62903-Q1 saves 0.6mm in length but shifts capacitor integration burden to the PCB - making LMQ66430MC5RXBRQ1 optimal for rapid, low-risk CISPR 25-compliant automotive designs.
Availability
LMQ66430MC5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, eCall modules, and body control gateways requiring stable component supply across automotive production lifecycles.
Supply support for LMQ66430MC5RXBRQ1 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 deep expertise in automotive power management and functional safety solutions.
The LMQ664x0-Q1 product line was designed specifically for ultra-compact, low-EMI automotive DC/DC conversion in space- and noise-constrained domains including ADAS sensor hubs and digital cockpit subsystems.
FAQ
What is the maximum input voltage transient the LMQ66430MC5RXBRQ1 can withstand?
The LMQ66430MC5RXBRQ1 supports 42V automotive load dump transients per ISO 16750-2. Its absolute maximum VIN rating is 42V, and it maintains regulation during these events without latch-off or damage when used with proper input capacitance and layout per TI's LMQ66430-Q1 evaluation module guidelines.
Does the LMQ66430MC5RXBRQ1 require external bootstrap or input bypass capacitors?
No. The LMQ66430MC5RXBRQ1 integrates both a 0.1µF bootstrap capacitor (between BOOT and SW) and two 22nF VIN bypass capacitors (in series between VIN and PGND). These on-die components eliminate the need for external CBOOT and high-frequency input bypass caps, reducing bill-of-materials count and layout sensitivity.
How does the MODE/SYNC pin function on the LMQ66430MC5RXBRQ1?
The MODE/SYNC pin on the LMQ66430MC5RXBRQ1 serves three roles: (1) logic high selects FPWM mode, (2) logic low enables auto (PFM) mode with frequency foldback, and (3) AC-coupled external clock input (0.2–2.5MHz) synchronizes switching to avoid beat frequencies. It does not affect thermal or overcurrent protection behavior.
What is the output voltage accuracy of the LMQ66430MC5RXBRQ1 at 5V fixed setting?
The LMQ66430MC5RXBRQ1 delivers 5.00V ±0.6% (4.94V to 5.06V) over full input range (5.5V–36V) and temperature (–40°C to +125°C) in FPWM mode. This accuracy is achieved using an internal trimmed reference and does not require external calibration or trimming components.
Is the LMQ66430MC5RXBRQ1 pin-compatible with other variants in the LMQ664x0-Q1 family?
Yes. All LMQ664x0-Q1 variants - including LMQ66430MC5RXBRQ1, LMQ66420MC5RXBRQ1, and LMQ66410MC5RXBRQ1 - share identical RXB 14-pin VQFN-FCRLF packaging, pinout, and footprint. Output current and switching frequency variants differ only in internal current-limit thresholds and oscillator configuration, enabling drop-in replacement during design iteration.
LMQ66430MC5RXBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 18V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMQ66430MC5RXBRQ1 FAQ
1.How can I place an order for LMQ66430MC5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66430MC5RXBRQ1 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 LMQ66430MC5RXBRQ1 reliable?
The price and inventory of LMQ66430MC5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66430MC5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66430MC5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66430MC5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66430MC5RXBRQ1?
LMQ66430MC5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66430MC5RXBRQ1 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 LMQ66430MC5RXBRQ1?
For technical support, including LMQ66430MC5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66430MC5RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66430MC5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66430MC5RXBRQ1 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 LMQ66430MC5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66430MC5RXBRQ1?
All LMQ66430MC5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66430MC5RXBRQ1, 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 LMQ66430MC5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66430MC5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66430MC5RXBRQ1 Tags
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