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Texas Instruments LMR66430MC5RXBRQ1
- Part No.:
- LMR66430MC5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMR66430MC5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR66430MC5RXBRQ1 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. It features peak-current-mode control, dual-random spread spectrum (DRSS), and MODE/SYNC pin for PFM/FPWM selection or external clock synchronization - deployed in radar ECUs and infotainment head units.
For engineers reviewing the LMR66430MC5RXBRQ1 datasheet, LMR66430MC5RXBRQ1 pinout, LMR66430MC5RXBRQ1 application, or LMR66430MC5RXBRQ1 equivalent, key selection considerations include its 2.2MHz fixed switching frequency, 1.5µA no-load quiescent current, enhanced HotRod™ QFN-14 package with wettable flanks, integrated power-good flag, and functional safety documentation support.
Technical Context
The LMR66430MC5RXBRQ1 implements peak-current-mode control with auto mode enabling frequency foldback below 1mA load, achieving ≥85% efficiency at 1mA and maintaining regulation during 42V automotive load dump transients. Its internal compensation eliminates external loop components, while DRSS and optimized HotRod™ pinout minimize EMI without requiring common-mode chokes.
It supports three operational modes via the MODE/SYNC pin: Auto (PFM at light load), FPWM (forced PWM across full load range), and SYNC (phase-locked to external clock up to 2.5MHz). The device integrates high-side and low-side MOSFETs with RDS(on) of 132mΩ (HS) and 75mΩ (LS), and includes thermal shutdown at 168°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous DC output - supports high-power automotive subsystems like radar transceivers without external current boosting. |
| Input Voltage Range | 3.0V to 36V after startup; withstands 42V transients - meets ISO 7637-2 Pulse 5a requirements for automotive load dump. |
| Output Voltage | Fixed 5.0V ±1.2% accuracy - eliminates need for external feedback resistors and simplifies layout in cost-sensitive modules. |
| Switching Frequency | Fixed 2.2MHz - enables use of small 1µH inductors and avoids AM band interference (530–1710kHz). |
| Quiescent Current | 1.5µA at 13.5V input, no load - sustains ultra-low power consumption for always-on vehicle networks (e.g., CAN wake-up circuits). |
| Package | RXB (VQFN-14, 2.6mm × 2.6mm) with wettable flanks - supports automated optical inspection (AOI) and improves solder joint reliability in automotive thermal cycling. |
| Thermal Shutdown | 168°C trip with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed ECU enclosures. |
Pinout & Package
LMR66430MC5RXBRQ1 uses the RXB package: a 14-pin enhanced HotRod™ VQFN (2.6mm × 2.6mm) with exposed thermal pad (GND/DAP) and wettable flanks. Pin 1 is marked by top-side dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| 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 battery-sensed rail without level-shifting. |
| VIN | Main input supply | Accepts 3.0–36V with 42V absolute max - supports cold-crank (3V) and load-dump (42V) conditions without external protection circuitry. |
| VOUT/FB | Fixed 5V output / feedback node | Internally configured for 5V; no external resistor divider needed - reduces BOM count and improves voltage accuracy stability over temperature. |
| MODE/SYNC | Mode selection & external clock sync | Selects Auto/FPWM or locks to external clock (0.2–2.5MHz); supports in-phase PLL locking - enables deterministic EMI reduction in multi-rail systems. |
| PG | Open-drain power-good flag | Asserts high after 2.5ms delay when VOUT reaches 90%; includes 2.4% OV/UV hysteresis - replaces discrete reset supervisor ICs in automotive domain controllers. |
| SW | Switch node | Connects to power inductor; minimized ringing due to bond-wire-free HotRod™ construction - reduces need for snubbers and lowers radiated emissions. |
| GND/DAP | Power ground & thermal pad | Exposed DAP must be soldered to PCB ground plane - achieves 26.2°C/W θJB for reliable 3A operation in compact automotive modules. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation | ISO 26262-ready documentation package available - accelerates ASIL-B system-level FMEDA and safety analysis for ADAS ECUs. |
| Dual-Random Spread Spectrum (DRSS) | Reduces peak EMI emissions by >10dB across 150kHz–108MHz - eliminates need for ferrite beads or shielding in cost-constrained body control modules. |
| Enhanced HotRod™ QFN | No bond wires + NC pins between HV nodes - improves robustness against mechanical stress and mitigates pin FMEA failure modes in vibration-prone automotive environments. |
| Auto Mode Light-Load Efficiency | 85% efficiency at 1mA load - extends battery runtime in parked-mode applications such as telematics eCall backup power. |
| Integrated Power-Good Flag | Programmable delay and hysteresis on PG pin - enables clean system sequencing without external supervisors in infotainment head units. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring stable 5V/2.5A under engine compartment thermal stress (–40°C to +125°C ambient). IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic and RF bias rails; maintains regulation during 42V load dump events. Use Value: Eliminates need for external TVS and pre-regulator stages due to 42V transient rating and internal current limiting. |
Use Scenario: Generates 5V main supply for ARM-based multimedia SoC and display interface in automotive head units. IC Role / Device Role / Timing Role: System PMIC front-end delivering low-noise, fast-transient 5V rail synchronized to audio clock domain. Use Value: 2.2MHz fixed frequency avoids AM-band interference; MODE/SYNC pin allows alignment with SoC clock tree to suppress beat frequencies. |
| eCall Telematics Backup Power | Body Control Module (BCM) Sensor Hub |
Use Scenario: Provides always-on 5V rail for GPS/GSM module in eCall systems, drawing <2µA quiescent current during vehicle sleep mode. IC Role / Device Role / Timing Role: Standby power manager ensuring rapid wake-up and transmission within 100ms of crash detection. Use Value: 1.5µA IQ enables >10-year battery life on supercapacitor backup; AEC-Q100 Grade 1 ensures reliability over full vehicle lifecycle. |
Use Scenario: Supplies 5V to LIN transceivers, door lock actuators, and ambient light sensors in centralized BCM designs. IC Role / Device Role / Timing Role: Centralized power source supporting multiple low-power peripherals with shared enable control. Use Value: NC pins between EN/VIN/SW reduce risk of short-circuit failures during board flex; wettable flanks ensure AOI-compatible solder joints. |
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 |
|---|---|---|---|
| LMR66430MC3RXBRQ1 | Fixed 3.3V output instead of 5V; identical pinout, package, and feature set | Targeted for digital I/O rails (e.g., MCU cores, FPGAs) rather than analog/USB-peripheral 5V domains | Select when system requires 3.3V logic supply with same thermal and EMI performance. |
| TPS62933QRVCRQ1 | 3A, 5V fixed, 2.2MHz, but uses different control architecture (D-CAP3) and lacks DRSS; smaller 2.0mm × 2.0mm QFN | Better light-load efficiency (90% at 100µA) but higher EMI without spread spectrum - suited for non-EMI-critical cabin modules | Choose for space-constrained designs where EMI filtering is handled externally and ultra-low IQ is secondary. |
Compared with LMR66430MC5RXBRQ1, LMR66430MC3RXBRQ1 offers identical automotive qualification and EMI performance but targets 3.3V loads, while TPS62933QRVCRQ1 trades DRSS-based EMI reduction for smaller footprint and slightly better light-load efficiency - making it suitable only where system-level EMI mitigation is already implemented.
Availability
LMR66430MC5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar), infotainment head units, eCall telematics, and body control modules requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for LMR66430MC5RXBRQ1 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 functional safety infrastructure.
The LMR664x0-Q1 product line was designed specifically for automotive power conversion in space-constrained, EMI-sensitive domains - emphasizing ultra-small footprint, low IQ, transient robustness, and integrated diagnostics for ADAS and infotainment systems.
FAQ
What is the maximum input voltage transient the LMR66430MC5RXBRQ1 can survive?
The LMR66430MC5RXBRQ1 supports 42V absolute maximum input voltage per its Absolute Maximum Ratings table, enabling it to withstand ISO 7637-2 Pulse 5a automotive load dump transients without external clamping. 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 LMR66430MC5RXBRQ1 require external compensation components?
No, the LMR66430MC5RXBRQ1 features fully internal control loop compensation optimized for minimal output capacitance - eliminating external compensation networks. This reduces design complexity, saves PCB area, and improves reliability by removing tuning-sensitive passive components from the feedback path.
How does the MODE/SYNC pin function on the LMR66430MC5RXBRQ1?
The MODE/SYNC pin on the LMR66430MC5RXBRQ1 selects between Auto mode (PFM at light load), FPWM mode (forced PWM across all loads), or external clock synchronization (0.2–2.5MHz). It uses a phase-locked loop to lock to external clocks without glitches, and remains in FPWM behavior during sync - preserving consistent timing margins in multi-rail systems.
What is the purpose of the NC pins in the LMR66430MC5RXBRQ1 package?
The NC pins in the LMR66430MC5RXBRQ1's RXB package are placed between critical high-voltage nodes (e.g., VIN, SW, EN) to improve pin-level FMEA robustness. They reduce risk of short-circuit failures caused by solder bridging or board-level contamination - a key reliability enhancement for automotive under-hood applications subject to thermal cycling and humidity.
Can the LMR66430MC5RXBRQ1 operate during automotive cold-crank conditions?
Yes, the LMR66430MC5RXBRQ1 supports 3.0V minimum input voltage after startup and 3.6V for initial start-up, meeting typical automotive cold-crank requirements (down to ~3V). Its 1.5µA quiescent current and auto mode ensure stable 5V output even during prolonged low-battery cranking events in sub-zero temperatures.
LMR66430MC5RXBRQ1 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):
- 5V
- 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)
LMR66430MC5RXBRQ1 FAQ
1.How can I place an order for LMR66430MC5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR66430MC5RXBRQ1 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 LMR66430MC5RXBRQ1 reliable?
The price and inventory of LMR66430MC5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR66430MC5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMR66430MC5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR66430MC5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR66430MC5RXBRQ1?
LMR66430MC5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR66430MC5RXBRQ1 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 LMR66430MC5RXBRQ1?
For technical support, including LMR66430MC5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR66430MC5RXBRQ1 requirements.
6.How does Aetrix verify that LMR66430MC5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR66430MC5RXBRQ1 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 LMR66430MC5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMR66430MC5RXBRQ1?
All LMR66430MC5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR66430MC5RXBRQ1, 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 LMR66430MC5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMR66430MC5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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