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Texas Instruments LMR66430MC3RXBRQ1
- Part No.:
- LMR66430MC3RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMR66430MC3RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
LMR66430MC3RXBRQ1 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 2.7V–36V input with 42V transient tolerance, optimized for radar ECUs and infotainment head units requiring ultra-low quiescent current (1.5µA) and high light-load efficiency.
For engineers reviewing the LMR66430MC3RXBRQ1 datasheet, LMR66430MC3RXBRQ1 pinout, LMR66430MC3RXBRQ1 application, or LMR66430MC3RXBRQ1 equivalent, key selection criteria include its fixed 2.2MHz switching frequency with dual-random spread spectrum, enhanced HotRod™ QFN-14 package with wettable flanks, MODE/SYNC pin for PFM/FPWM mode selection or external clock synchronization, and integrated power-good flag with 2.5ms activation delay.
Technical Context
The LMR66430MC3RXBRQ1 uses peak-current-mode control with frequency foldback in Auto mode to maintain regulation down to 1.5µA no-load input current, enabling always-on automotive systems. Its internal compensation eliminates external loop components while supporting minimal output capacitance.
It integrates dual-random spread spectrum (DRSS) and an enhanced HotRod™ QFN-14 package with NC pins between critical high-voltage nodes to reduce EMI and improve pin-level FMEA reliability. The MODE/SYNC pin enables seamless transition between PFM (light load), FPWM (full-frequency), and synchronized operation modes without compromising regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous DC output - supports high-power ADAS sensors and infotainment SoCs without external current boosting. |
| Input Voltage Range | 2.7V to 36V (post-startup), with 42V transient tolerance - handles automotive cold-crank (3V) and load-dump events without protection circuitry. |
| Output Voltage | Fixed 3.3V ±0.9% over –40°C to +150°C - eliminates feedback resistor network, reducing BOM count and layout sensitivity. |
| Switching Frequency | Fixed 2.2MHz ±5% - enables use of small 1µH inductors and avoids AM-band interference while maintaining high efficiency. |
| Quiescent Current | 1.5µA typical at 13.5VIN, Auto mode - sustains battery life in always-on vehicle modules such as telematics and eCall. |
| Thermal Shutdown | 158°C trip, 20°C hysteresis - protects against sustained overload in sealed automotive enclosures without derating. |
| EMI Reduction | Dual-random spread spectrum (DRSS) + enhanced HotRod™ QFN - reduces peak emissions by >10dB, eliminating need for common-mode chokes in most layouts. |
Pinout & Package
LMR66430MC3RXBRQ1 is housed in a 2.6mm × 2.6mm enhanced HotRod™ VQFN-FCRLF package (RXB, 14-pin) with wettable flanks and thermal DAP connected to GND for optimal PCB heat dissipation.
| 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 - allows direct connection to VIN or microcontroller GPIO without level-shifting. |
| VIN | Main input supply | Accepts 2.7–36V with 42V transient rating - requires local 10µF ceramic bypass to PGND for stable startup under load dump. |
| SW | Power switch node | Connects to external inductor - low ringing due to bond-wire-free HotRod™ construction minimizes EMI and improves reliability. |
| BOOT | High-side gate driver supply | Requires 0.1µF/16V capacitor to SW - enables efficient 30V+ operation with low RDSON-HS (132mΩ typ). |
| VOUT/FB | Fixed 3.3V output / feedback node | Internally trimmed; no external resistors needed - simplifies layout and improves accuracy across temperature (±0.1% drift from –40°C to +125°C). |
| MODE/SYNC | Mode control / external clock input | Selects Auto (PFM), FPWM, or SYNC via voltage thresholds (1V low / 1.6V high) - enables noise-sensitive system timing coordination. |
| PG | Open-drain power-good flag | Asserts high after 2.5ms soft-start completion - replaces external reset supervisor in many automotive applications. |
| GND/DAP | Power ground / thermal pad | Must be soldered to solid GND plane - achieves 26.2°C/W junction-to-board thermal resistance for 3A continuous operation. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety-Capable | Documentation available per ISO 26262 ASIL-B support - enables integration into safety-critical ADAS domain controllers without custom qualification effort. |
| AEC-Q100 Grade 1 | Validated for –40°C to +125°C ambient (junction up to +150°C) - meets thermal requirements for engine bay and dashboard-mounted electronics. |
| Ultra-Low IQ Operation | 1.5µA shutdown current and 1.5µA no-load Auto mode current - extends battery runtime in parked vehicle scenarios beyond 30 days. |
| Integrated Power-Good Flag | 2.5ms delay, 100Ω on-resistance, 104–111% OV threshold - provides deterministic system reset timing without external comparators or RC networks. |
| NC Pin Isolation Strategy | Multiple NC pins placed between VIN, SW, and PGND - reduces risk of latent short-circuit failure during board flex or contamination, improving field reliability. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC in front bumper module, operating continuously during vehicle motion and intermittently during parking surveillance. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying RF front-end, digital baseband, and CAN FD interface - maintains regulation during 42V load dump and 3V cold crank. Use Value: DRSS + HotRod™ package achieves <15dBµV/m radiated emissions at 10m without shielding, meeting CISPR 25 Class 5 limits for radar co-location. | Use Scenario: Supplies application processor, display controller, and audio codec in central infotainment unit with always-on voice wake-up capability. IC Role / Device Role / Timing Role: Always-on 3.3V rail generator with 1.5µA quiescent current - enables sub-100µA system sleep current while retaining fast wake-up response. Use Value: Fixed 3.3V output eliminates feedback resistor mismatch errors, ensuring consistent DDR I/O and PCIe reference voltage across production units. |
| eCall Telematics Module | Body Control Module (BCM) Sensor Hub |
Use Scenario: Powers GSM/LTE modem, GNSS receiver, and crash sensor interface in emergency call system with backup battery operation. IC Role / Device Role / Timing Role: Dual-input capable regulator accepting main battery (9–16V) or backup Li-ion (3.0–4.2V) - maintains 3.3V output during ignition-off battery drain. Use Value: 2.2MHz fixed frequency enables use of 1.0×1.0mm shielded inductor, reducing module footprint by 35% vs. 500kHz alternatives. | Use Scenario: Supplies 3.3V to LIN transceivers, ambient light sensors, and door lock actuators in centralized body electronics architecture. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with NC pin isolation and best-in-class pin FMEA - reduces field return rate for moisture-induced shorts. Use Value: Wettable flanks enable automated optical inspection (AOI) of solder joints, improving first-pass yield in high-volume BCM manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR66430MC5RXBRQ1 | Fixed 5V output instead of 3.3V; identical pinout, package, and electrical specs otherwise | Used where 5V logic rails or USB-powered peripherals require primary regulation | Select when system architecture mandates 5V core rail - no layout change required, but output capacitor and inductor values may differ slightly due to load transient profile. |
| TPS62933QRGXRQ1 | 3A, 3.3V fixed, 2.2MHz, but uses different control architecture (constant-on-time) and lacks DRSS; smaller 2.0mm × 2.0mm package | Suitable for space-constrained modules where EMI filtering is handled externally | Choose for compact designs where board area is critical and system-level EMI mitigation is already implemented - verify thermal performance at 3A continuous load in same PCB stackup. |
Compared with LMR66430MC5RXBRQ1, the LMR66430MC3RXBRQ1 offers identical automotive qualification and EMI performance but targets 3.3V logic domains directly; versus TPS62933QRGXRQ1, it delivers superior radiated emissions suppression via DRSS and HotRod™ packaging, at the cost of 0.6mm² larger footprint.
Availability
LMR66430MC3RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, eCall telematics modules, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LMR66430MC3RXBRQ1 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies for automotive, industrial, and communications markets.
The LMR664x0-Q1 product line was designed specifically for automotive power management in ADAS, infotainment, and body electronics - emphasizing functional safety readiness, ultra-low IQ, and robust EMI performance in harsh environments.
FAQ
What is the maximum input voltage transient the LMR66430MC3RXBRQ1 can withstand?
The LMR66430MC3RXBRQ1 supports 42V input transients, fully compliant with ISO 7637-2 Pulse 5a (load dump) requirements for 12V automotive systems. This rating is specified in the Absolute Maximum Ratings table and validated per AEC-Q100 stress testing - no external TVS diode is required for standard vehicle architectures.
Does the LMR66430MC3RXBRQ1 require external compensation components?
No, the LMR66430MC3RXBRQ1 features fully internal loop compensation optimized for minimal output capacitance. This eliminates external compensation networks and reduces design complexity - only input and output ceramic capacitors plus an inductor are required for basic operation per the typical application schematic in the datasheet.
How does the MODE/SYNC pin function on the LMR66430MC3RXBRQ1?
The MODE/SYNC pin on the LMR66430MC3RXBRQ1 supports three modes: Auto (PFM at light loads), FPWM (fixed 2.2MHz), or external clock synchronization. It responds to voltage thresholds (≤1V = Auto, ≥1.6V = FPWM/SYNC) and accepts external clocks from 200kHz to 2.5MHz - enabling precise noise avoidance in radar and camera subsystems.
What is the thermal performance of the LMR66430MC3RXBRQ1 in a standard 4-layer PCB?
On a JEDEC-standard 4-layer board, the LMR66430MC3RXBRQ1 achieves 66.1°C/W junction-to-ambient thermal resistance (RθJA) and 26.2°C/W junction-to-board (RθJB). With proper GND/DAP soldering and 2oz copper, it sustains 3A continuous output at +85°C ambient without derating - verified in TI's LMR66430-2EVM test data.
Is the LMR66430MC3RXBRQ1 pin-compatible with other variants in the LMR664x0-Q1 family?
Yes, all LMR664x0-Q1 variants including LMR66430MC3RXBRQ1, LMR66430MC5RXBRQ1, and LMR66430R3RXBRQ1 share identical RXB (VQFN-14) package, pinout, and footprint. Output voltage and MODE/SYNC functionality differ by variant, but PCB layout, thermal pad, and peripheral components remain interchangeable across the family.
LMR66430MC3RXBRQ1 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMR66430MC3RXBRQ1 FAQ
1.How can I place an order for LMR66430MC3RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR66430MC3RXBRQ1 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 LMR66430MC3RXBRQ1 reliable?
The price and inventory of LMR66430MC3RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR66430MC3RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMR66430MC3RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR66430MC3RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR66430MC3RXBRQ1?
LMR66430MC3RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR66430MC3RXBRQ1 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 LMR66430MC3RXBRQ1?
For technical support, including LMR66430MC3RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR66430MC3RXBRQ1 requirements.
6.How does Aetrix verify that LMR66430MC3RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR66430MC3RXBRQ1 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 LMR66430MC3RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMR66430MC3RXBRQ1?
All LMR66430MC3RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR66430MC3RXBRQ1, 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 LMR66430MC3RXBRQ1 part is unused and in its original packaging.
Return procedure for LMR66430MC3RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR66430MC3RXBRQ1 Tags
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