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Texas Instruments LMQ66430MA3RXBRQ1
- Part No.:
- LMQ66430MA3RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66430MA3RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,963
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Product details
Overview
LMQ66430MA3RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 3A output at fixed 3.3V, operating from 3.0V to 36V input with 42V transient tolerance. It integrates VIN bypass and CBOOT capacitors, uses peak current mode control, and features dual-random spread spectrum (DRSS) for CISPR 25 Class 5 EMI compliance - deployed in radar ECUs and infotainment head units.
For engineers reviewing the LMQ66430MA3RXBRQ1 datasheet, LMQ66430MA3RXBRQ1 pinout, LMQ66430MA3RXBRQ1 application, or LMQ66430MA3RXBRQ1 equivalent, key selection criteria include its 400 kHz fixed switching frequency, integrated capacitors reducing external BOM count, thermal shutdown at 168°C, ultra-low 1.5 µA no-load quiescent current, and enhanced HotRod QFN-14 package with wettable flanks for automotive reliability.
Technical Context
The LMQ66430MA3RXBRQ1 implements peak current mode control with auto-mode frequency foldback, enabling seamless PWM-to-PFM transition and maintaining >85% efficiency at 1mA load. Its ZEN 2 switcher architecture integrates two 22-nF VIN bypass capacitors and a 0.1-µF bootstrap capacitor internally, eliminating associated external components and minimizing high-frequency ringing.
It supports three MODE/SYNC configurations: Auto (PFM/FPWM selectable), FPWM-only, or external clock synchronization (0.2–2.5 MHz). Critical safety features include functional safety documentation support, AEC-Q100 qualification, NC pins between high-voltage nodes for FMEA optimization, and 150°C junction temperature rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous DC output - supports full-power operation in ADAS radar modules without derating at 125°C ambient. |
| Input Voltage Range | 3.0 V to 36 V after startup; withstands 42 V load dump transients - meets ISO 7637-2 Pulse 5a requirements for automotive systems. |
| Switching Frequency | Fixed 400 kHz - avoids AM band interference while enabling smaller magnetics than 2.2 MHz variants; supports frequency foldback under low-VIN conditions. |
| Quiescent Current | 1.5 µA typical at 13.5 VIN, 0 A load, Auto mode - enables always-on functionality in vehicle wake-up circuits with minimal battery drain. |
| Output Voltage | Fixed 3.3 V ±0.9% over –40°C to +125°C - eliminates external feedback resistors and ensures stable MCU core rail regulation. |
| Thermal Shutdown | 168°C trip threshold with 20°C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed ECU housings. |
| Package | VQFN-FCRLF-14 (RXB), 2.6 mm × 2.6 mm with wettable flanks - enables automated optical inspection and robust solder joint reliability per J-STD-020. |
Pinout & Package
VQFN-FCRLF-14 (RXB) package: 2.6 mm × 2.6 mm body, 0.4 mm pitch, exposed thermal pad (GND/DAP) requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable input with precision UVLO | Starts regulator when VIN ≥ 3.35 V; shuts down at ≤ 2.7 V; supports direct connection to VIN for simple enable logic. |
| 3 VIN | Main power input | Internally connects to two series 22-nF bypass caps; requires external bulk capacitance only for low-frequency ripple suppression. |
| 6 PGND | Power ground return | Low-inductance path for high di/dt switch currents; must be routed with short, wide copper to minimize noise coupling. |
| 7 SW | Switch node | Connects to power inductor; high dv/dt node - layout critical to EMI performance; minimized ringing via HotRod bondless construction. |
| 8 BOOT | Bootstrap supply | Internally connected to SW via 0.1-µF capacitor - eliminates external boot cap and reduces component count and board area. |
| 10 VCC | Internal LDO output | 3.3 V ±3% regulated supply for control circuitry; can power external logic or PG pull-up; decoupled with 1-µF ceramic cap. |
| 11 VOUT/FB | Output voltage sense / feedback | Fixed 3.3 V output configuration - tied directly to output; no external resistor divider needed, simplifying layout and calibration. |
| 13 MODE/SYNC | Mode selection / clock sync | Configures Auto/FPWM operation or accepts external 0.2–2.5 MHz clock; enables deterministic timing in multi-rail systems. |
| 14 PG | Open-drain power-good flag | Asserts high after soft-start completes (2.5 ms delay); provides system reset signaling without external supervisor IC. |
| 2,4,5,9,12 NC | No-connect terminals | Isolate critical high-voltage pins (VIN, SW, BOOT); improve pin-level FMEA by preventing unintended shorts or leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| ZEN 2 switcher architecture | Integrates dual 22-nF VIN bypass and 0.1-µF CBOOT capacitors - reduces external component count by up to 4 passive parts and shrinks total solution size by 30%. |
| Dual-random spread spectrum (DRSS) | Reduces peak EMI emissions by >10 dB across 150 kHz–108 MHz - enables CISPR 25 Class 5 compliance without common-mode chokes or shielding. |
| Enhanced HotRod QFN package | Bondless construction with wettable flanks - suppresses switch-node ringing, improves thermal resistance (RθJB = 26.2°C/W), and supports AOI verification. |
| Auto-mode light-load efficiency | Maintains >85% efficiency at 1 mA output - achieves ultra-low standby power for always-on automotive domains like telematics and sensor hubs. |
| Functional safety documentation support | Includes FIT rate, failure modes, and diagnostic coverage data - accelerates ISO 26262 ASIL-B system-level safety analysis for ADAS applications. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77 GHz radar SoC and signal chain in compact front-bumper module with strict EMI limits and cold-crank operation. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator supplying digital core, ADC reference, and interface logic; operates continuously during vehicle sleep mode. Use Value: Integrated capacitors and DRSS eliminate need for external EMI filters; 400 kHz switching enables use of small, low-DCR shielded inductors (2.2 µH) without compromising transient response. |
Use Scenario: Supplies 3.3 V rail to application processor, display controller, and audio codec in center-stack infotainment system with variable load profiles. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting dynamic DVFS; PG flag sequences system boot and safe shutdown. Use Value: 1.5 µA quiescent current extends battery backup time during ignition-off; NC-pin isolation prevents latch-up during 42 V load dump events. |
| eCall Telematics Module | Body Control Module (BCM) Sensor Interface |
Use Scenario: Powers GSM/LTE modem, GPS receiver, and accelerometer in crash-triggered emergency call unit mounted in roof console. IC Role / Device Role / Timing Role: Always-on 3.3 V supply with fast wake-up from ultra-low-power state; PG signal triggers microcontroller initialization upon VIN restoration. Use Value: Soft-start time (3.5 ms) and PG assertion delay (2.5 ms) ensure clean power sequencing; 150°C junction rating supports operation in thermally constrained enclosures. |
Use Scenario: Regulates 3.3 V for CAN transceivers, LIN gateways, and environmental sensors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main 12 V bus; handles cold-crank (3 VIN) and load-dump (42 V) transients without dropout. Use Value: 3.0–36 V input range and 42 V absolute max rating eliminate need for upstream TVS or pre-regulator; internal compensation reduces design iteration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66430MC3RXBRQ1 | Same 3A/3.3V output but fixed 2.2 MHz switching frequency - higher frequency enables smaller inductors but increases switching losses at high load. | Better suited for space-constrained designs where EMI filtering is handled externally; less optimal for low-noise analog sections near AM radio bands. | Select when board area is primary constraint and system-level EMI mitigation is already implemented. |
| LMQ66420MA3RXBRQ1 | 2A output version with identical 400 kHz frequency, package, and feature set - lower current capability with reduced RDS(on) (HS: 180 mΩ, LS: 100 mΩ). | Valid drop-in replacement where peak load remains ≤2A; offers marginally better light-load efficiency due to lower gate charge. | Choose for cost-sensitive body electronics where 3A headroom is unnecessary and BOM reuse is prioritized. |
Compared with LMQ66430MC3RXBRQ1, the LMQ66430MA3RXBRQ1 trades higher-frequency operation for superior AM-band EMI immunity and lower switching loss at medium loads; versus LMQ66420MA3RXBRQ1, it delivers 50% more current headroom for future-proofing radar or compute-intensive modules without changing layout.
Availability
LMQ66430MA3RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, eCall telematics, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LMQ66430MA3RXBRQ1 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 ICs, with decades of AEC-Q100 validation expertise and broad automotive reference design support.
The LMQ664x0-Q1 product line was engineered specifically for ultra-compact, low-EMI, always-on automotive power rails - targeting radar, infotainment, and domain controller applications where board space, thermal density, and regulatory compliance are critical.
FAQ
What is the maximum input voltage the LMQ66430MA3RXBRQ1 can withstand during automotive load dump events?
The LMQ66430MA3RXBRQ1 supports 42 V absolute maximum input voltage per its Absolute Maximum Ratings table, enabling reliable operation during ISO 7637-2 Pulse 5a load dump transients without external protection circuitry. This rating applies across the full –40°C to +150°C junction temperature range and is validated per AEC-Q100 stress testing protocols.
Does the LMQ66430MA3RXBRQ1 require external input or bootstrap capacitors?
No - the LMQ66430MA3RXBRQ1 integrates two 22-nF VIN bypass capacitors in series and a 0.1-µF bootstrap capacitor internally, eliminating the need for external CIN and CBOOT. Only a single high-quality bulk input capacitor (e.g., 10 µF X5R ceramic) is recommended for low-frequency ripple suppression and stability.
How does the MODE/SYNC pin function on the LMQ66430MA3RXBRQ1?
The MODE/SYNC pin on the LMQ66430MA3RXBRQ1 configures three operating modes: Auto (PFM/FPWM selectable), FPWM-only, or external clock synchronization (0.2–2.5 MHz). In SYNC mode, the internal oscillator locks to the rising edge of the external clock, enabling deterministic timing across multiple rails without phase jitter or glitches.
What is the typical quiescent current of the LMQ66430MA3RXBRQ1 at zero load?
The LMQ66430MA3RXBRQ1 draws 1.5 µA typical input current at 13.5 VIN, 0 A load, and Auto mode - verified over –40°C to +125°C ambient. This ultra-low IQ enables always-on functionality in automotive domains such as telematics and sensor hubs while minimizing parasitic battery drain during vehicle sleep states.
Is the LMQ66430MA3RXBRQ1 pin-compatible with other members of the LMQ664x0-Q1 family?
Yes - all LMQ664x0-Q1 variants (LMQ66410/20/30, MA/MC suffixes) share identical VQFN-FCRLF-14 (RXB) packaging, pinout, and footprint. The LMQ66430MA3RXBRQ1 can be substituted for LMQ66420MA3RXBRQ1 or LMQ66410MA3RXBRQ1 on the same PCB, though output current capability and current-limit thresholds differ per variant.
LMQ66430MA3RXBRQ1 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):
- -
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMQ66430MA3RXBRQ1 FAQ
1.How can I place an order for LMQ66430MA3RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66430MA3RXBRQ1 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 LMQ66430MA3RXBRQ1 reliable?
The price and inventory of LMQ66430MA3RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66430MA3RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66430MA3RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66430MA3RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66430MA3RXBRQ1?
LMQ66430MA3RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66430MA3RXBRQ1 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 LMQ66430MA3RXBRQ1?
For technical support, including LMQ66430MA3RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66430MA3RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66430MA3RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66430MA3RXBRQ1 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 LMQ66430MA3RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66430MA3RXBRQ1?
All LMQ66430MA3RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66430MA3RXBRQ1, 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 LMQ66430MA3RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66430MA3RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66430MA3RXBRQ1 Tags
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