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Texas Instruments LMR66410MC5RXBRQ1
- Part No.:
- LMR66410MC5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMR66410MC5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
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Product details
Overview
LMR66410MC5RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1A output current, supporting 2.7V–36V input range with 42V transient tolerance, fixed 5V output, and 2.2MHz switching frequency - used in radar ECUs and infotainment head units for compact, low-EMI power conversion.
For engineers reviewing the LMR66410MC5RXBRQ1 datasheet, LMR66410MC5RXBRQ1 pinout, LMR66410MC5RXBRQ1 application, or LMR66410MC5RXBRQ1 equivalent, key selection considerations include its 1.5µA no-load quiescent current, dual-random spread spectrum (DRSS) EMI reduction, enhanced HotRod™ QFN-14 package with wettable flanks, functional safety documentation support, and MODE/SYNC pin for PFM/FPWM mode selection or external clock synchronization.
Technical Context
The LMR66410MC5RXBRQ1 employs peak-current-mode control with auto-mode frequency foldback to maintain regulation down to 1.5µA quiescent current, enabling always-on automotive operation. Its integrated high-side (132mΩ typ.) and low-side (75mΩ typ.) MOSFETs, internal compensation, and soft-start (3.5ms typical) eliminate external loop components and simplify design.
It features a dedicated MODE/SYNC pin supporting three operational modes: Auto (PFM at light load), FPWM (forced PWM across full load range), and SYNC (in-phase PLL lock to external clock up to 2.5MHz). The device includes precision enable thresholds (VEN-VOUT = 1.23V typ.), power-good flag with 2.5ms activation delay, and thermal shutdown at 168°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports automotive body electronics and ADAS sensors requiring stable mid-power rail. |
| Input Voltage Range | 2.7V–36V (operating), 3.6V–36V (start-up) - withstands cold-crank (3V) and load-dump (42V) transients without external protection. |
| Switching Frequency | Fixed 2.2MHz - enables use of small 1µH inductors and avoids AM-band interference; supports external sync up to 2.5MHz. |
| Quiescent Current | 1.5µA at 13.5VIN, no load - sustains ultra-low-power standby in always-on vehicle modules. |
| Output Voltage | Fixed 5.00V ±0.6% - eliminates feedback resistor network, reducing BOM count and layout sensitivity. |
| Package | RXB (VQFN-14, 2.6mm × 2.6mm) with wettable flanks - supports automated optical inspection and robust thermal performance (RθJA = 66.1°C/W). |
| EMI Mitigation | Dual-random spread spectrum (DRSS) + enhanced HotRod™ layout - reduces peak emissions without common-mode chokes or shielding. |
Pinout & Package
LMR66410MC5RXBRQ1 uses the RXB package: 14-pin enhanced HotRod™ VQFN (2.6mm × 2.6mm) with exposed thermal pad (GND/DAP), wettable flanks, and corner anchor pins for solder reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable input with precision UVLO | Starts regulation when VIN ≥ 3.35V; shuts down below 2.7V; supports direct connection to VIN for simple on/off control. |
| 3 VIN | Main power input | Accepts 2.7V–36V; handles 42V transients; requires local ceramic bypass to PGND for stability. |
| 6 PGND | Power ground return | Low-inductance path for high di/dt switch currents; must connect directly to CIN ground plane with short wide trace. |
| 7 SW | Switch node | Connects to inductor; high dv/dt node - minimized ringing via HotRod™ bondless construction and DRSS. |
| 8 BOOT | Bootstrap supply | Requires 0.1µF/16V capacitor to SW; enables high-side gate drive without external charge pump. |
| 10 VCC | Internal LDO output | 3.3V internal supply; powers control circuitry; can source logic-level PG signal; decoupled with 1µF to GND. |
| 11 VOUT/FB | Fixed 5V output / feedback node | Fixed-output variant - connects directly to output capacitor; no external resistors needed. |
| 13 MODE/SYNC | Mode selection / clock sync input | Selects Auto (PFM), FPWM, or external sync; voltage thresholds: <1V = Auto, >1.6V = FPWM, 100ns pulses = mode toggle. |
| 14 PG | Open-drain power-good flag | Asserts high after 2.5ms soft-start; indicates VOUT within ±4.2% of target; requires pull-up resistor. |
| 2,4,5,9,12 NC | No-connect terminals | Isolate critical high-voltage pins (VIN, SW, BOOT); improve pin-level FMEA and reduce field failure risk. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation Support | Includes FIT rate data, FMEDA reports, and safety analysis guidance - accelerates ISO 26262 ASIL-B system certification. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +125°C ambient (–40°C to +150°C junction) - meets automotive cabin and engine bay thermal requirements. |
| Dual-Random Spread Spectrum (DRSS) | Reduces peak EMI by >10dB across 150kHz–1GHz - eliminates need for ferrite beads or shielded inductors in most layouts. |
| Auto Mode with Frequency Foldback | Transitions seamlessly from FPWM to PFM below ~100mA; maintains >85% efficiency at 1mA load - ideal for always-on telematics. |
| Enhanced HotRod™ QFN with Wettable Flanks | Eliminates bond wires to reduce parasitic inductance; wettable flanks enable AOI-compatible solder joint inspection. |
| Integrated Power-Good Flag with Delay | PG asserts 2.5ms after soft-start completion; built-in deglitch (40µs) and hysteresis (2.4%) - replaces external reset supervisor ICs. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASICs in front-end ADAS modules requiring clean, low-noise 5V supply with fast transient response. IC Role / Device Role / Timing Role: Primary buck regulator supplying FPGA I/O banks and RF front-end bias rails; operates in FPWM mode during active sensing bursts. Use Value: 2.2MHz fixed frequency avoids radar band interference; DRSS and HotRod™ packaging minimize conducted EMI into sensitive analog sections. |
Use Scenario: Generates stable 5V core rail for SoC, display controller, and audio codec in automotive head units with CAN/FlexRay connectivity. IC Role / Device Role / Timing Role: Always-on system power manager; enters Auto mode during display-off sleep states to sustain <2µA system standby current. Use Value: 1.5µA quiescent current extends battery life during parking mode; NC pin isolation prevents latch-up during CAN bus ESD events. |
| Body Control Module (BCM) Subsystem | eCall Telematics Power Management |
|
Use Scenario: Supplies 5V to door module microcontrollers, LED drivers, and LIN transceivers in distributed body electronics architecture. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main 12V battery rail; supports cold-crank (3V) operation without brownout. Use Value: 36V max input and 42V transient rating eliminate need for upstream TVS; wettable flanks ensure solder joint reliability in high-vibration environments. |
Use Scenario: Powers GPS/GSM modem and backup SRAM in emergency call (eCall) systems requiring guaranteed operation during battery disconnect. IC Role / Device Role / Timing Role: Standby power conditioner with precise enable threshold (1.23V) - triggers only when main battery recovers post-crash. Use Value: Precision EN hysteresis (0.35V) prevents oscillation during marginal battery conditions; PG flag validates rail integrity before modem wake-up. |
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 |
|---|---|---|---|
| LMR66420MC5RXBRQ1 | 2A rated output current; identical pinout, package, and feature set - higher current capability with same footprint. | Suitable where future-proofing for higher load or parallel operation is required; same thermal design but higher peak current handling. | Select when system load may exceed 1A or when margin for aging/temperature derating is needed without layout change. |
| TPS62933QRTERQ1 | 3A output, 2.5V–18V input, 1.8MHz fixed frequency, lower IQ (0.5µA), but no DRSS or MODE/SYNC pin - different EMI strategy. | Better suited for space-constrained non-radar applications where ultra-low IQ dominates over EMI control; lacks automotive sync flexibility. | Prefer when lowest possible standby power is critical and EMI is managed at board level; not drop-in due to different pin functions and input range. |
Compared with LMR66420MC5RXBRQ1, the LMR66410MC5RXBRQ1 offers tighter thermal margin and lower gate drive losses at 1A loads, while the TPS62933QRTERQ1 trades EMI control and automotive sync capability for deeper sleep current - making LMR66410MC5RXBRQ1 optimal for radar and infotainment where spectral purity and functional safety integration are mandatory.
Availability
LMR66410MC5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, body electronics modules, and eCall telematics requiring stable component supply across automotive production lifecycles.
Supply support for LMR66410MC5RXBRQ1 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 qualification experience.
The LMR664x0-Q1 family was designed specifically for automotive power rails demanding ultra-low quiescent current, robust EMI performance, and functional safety compliance - targeting radar, infotainment, and body control applications.
FAQ
What is the maximum input voltage transient the LMR66410MC5RXBRQ1 can withstand?
The LMR66410MC5RXBRQ1 supports 42V input transients per AEC-Q100 load-dump specification. Its absolute maximum VIN rating is 42V, and it maintains regulation during these events without external clamping components - verified across –40°C to +125°C ambient temperature range.
Does the LMR66410MC5RXBRQ1 require external compensation components?
No, the LMR66410MC5RXBRQ1 features fully internal control-loop compensation. Its peak-current-mode architecture and optimized internal compensation network eliminate the need for external RC networks or type-II/type-III compensators - reducing BOM count and layout complexity.
How does the MODE/SYNC pin function in the LMR66410MC5RXBRQ1?
The MODE/SYNC pin on the LMR66410MC5RXBRQ1 selects between Auto (PFM), FPWM, or external clock synchronization modes. Applying <1V sets Auto mode; >1.6V sets FPWM; and valid clock pulses (100ns wide, 0.2–2.5MHz) lock the internal oscillator in SYNC mode - all without changing PCB layout.
What is the purpose of the NC pins on the LMR66410MC5RXBRQ1 package?
The NC pins (2, 4, 5, 9, 12) on the LMR66410MC5RXBRQ1 provide physical isolation between high-voltage nodes (VIN, SW, BOOT) to improve pin-level FMEA scores and reduce risk of field failures caused by contamination or dendritic growth - a key reliability enhancement for automotive under-hood applications.
Can the LMR66410MC5RXBRQ1 operate during automotive cold-crank conditions?
Yes, the LMR66410MC5RXBRQ1 supports 3V minimum input during cold-crank events. Its start-up threshold is 3.35V (typical), and it maintains regulation down to 3.0V after start-up - ensuring uninterrupted power to critical modules like eCall and gateway ECUs during battery voltage sag.
LMR66410MC5RXBRQ1 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:
- 1A
- 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)
LMR66410MC5RXBRQ1 FAQ
1.How can I place an order for LMR66410MC5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR66410MC5RXBRQ1 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 LMR66410MC5RXBRQ1 reliable?
The price and inventory of LMR66410MC5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR66410MC5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMR66410MC5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR66410MC5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR66410MC5RXBRQ1?
LMR66410MC5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR66410MC5RXBRQ1 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 LMR66410MC5RXBRQ1?
For technical support, including LMR66410MC5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR66410MC5RXBRQ1 requirements.
6.How does Aetrix verify that LMR66410MC5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR66410MC5RXBRQ1 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 LMR66410MC5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMR66410MC5RXBRQ1?
All LMR66410MC5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR66410MC5RXBRQ1, 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 LMR66410MC5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMR66410MC5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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