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Texas Instruments LMR66410R5RXBR
- Part No.:
- LMR66410R5RXBR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMR66410R5RXBR.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
LMR66410R5RXBR from Texas Instruments is a 36-V, 1-A synchronous step-down DC/DC converter in a 2.6-mm × 2.6-mm enhanced HotRod QFN package, featuring fixed 5-V output, adjustable switching frequency (200 kHz–2.2 MHz via RT pin), input transient protection up to 42 V, and 1.5 µA quiescent current at 13.5 VIN. It serves as the primary power stage for industrial PLCs, test equipment, and medical sensors requiring high reliability under –40°C to +150°C junction temperature.
For engineers reviewing the LMR66410R5RXBR datasheet, LMR66410R5RXBR pinout, LMR66410R5RXBR application, or LMR66410R5RXBR equivalent, key selection considerations include its 1-A rated output, 5-V fixed output configuration, RT-pin-based frequency adjustability, dual-random spread spectrum for EMI reduction, and thermal shutdown at 168°C with 20°C hysteresis.
Technical Context
The LMR66410R5RXBR uses peak-current-mode control with internal compensation and auto-mode frequency foldback to maintain regulation across light-to-full load. Its architecture integrates high-side and low-side MOSFETs with RDS(on) of 260 mΩ (HS) and 140 mΩ (LS) at 1 A, enabling >85% efficiency at 1 mA and stable operation down to 2.7 VIN after startup.
It implements dual-random spread spectrum (DRSS) and an optimized HotRod QFN pinout-featuring NC pins between critical high-voltage nodes-to suppress switch-node ringing and improve FMEA robustness. The RT pin variant supports external resistor-based frequency setting without requiring synchronization circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous DC output - supports full-load operation in space-constrained industrial modules. |
| Input Voltage Range | 2.7 V to 36 V (after start-up); withstands 42-V transients - eliminates need for upstream TVS in 24-V rail systems. |
| Output Voltage | Fixed 5 V ±1% - enables direct powering of microcontrollers, ADCs, and logic without external feedback resistors. |
| Quiescent Current | 1.5 µA at 13.5 VIN, no load - sustains battery-backed operation for >10 years in always-on sensor nodes. |
| Switching Frequency | Adjustable 200 kHz–2.2 MHz via RT pin - allows EMI band avoidance and inductor size optimization. |
| Thermal Shutdown | 168°C trip with 20°C hysteresis - ensures safe derating in sealed enclosures without forced airflow. |
| Efficiency @ 1 mA | >85% at VIN = 12 V, VOUT = 5 V - maintains regulation during deep sleep modes in portable instrumentation. |
Pinout & Package
Package: RXB (enhanced HotRod™ VQFN-FCRLF, 14-pin, 2.6 mm × 2.6 mm, wettable flanks, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / UVLO input | Logic-level control with 0.7 V wake threshold; supports direct connection to VIN for simple on/off. |
| VIN | Main input supply | Accepts 2.7–36 V; handles 42-V transients - reduces need for input overvoltage clamping. |
| VOUT/FB | Output voltage sense / feedback | Fixed 5-V configuration - internally tied; no external divider required. |
| RT | Frequency adjustment | Resistor-to-GND sets switching frequency from 200 kHz to 2.2 MHz - enables EMI tuning. |
| SW | Power switch node | Connects to external inductor; low parasitic layout minimizes ringing due to HotRod package. |
| BOOT | High-side gate driver supply | Requires 0.1-µF capacitor to SW - enables efficient bootstrap charging without external charge pump. |
| PG | Open-drain power-good flag | Signals valid output after soft-start delay (2.5 ms); replaces external reset supervisor IC. |
| GND/DAP | Power ground / thermal pad | Exposed pad must be soldered to PCB ground plane - achieves 26.2°C/W θJB for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.5 µA shutdown current enables multi-year battery life in remote monitoring nodes. |
| Dual-random spread spectrum (DRSS) | Reduces peak EMI emissions by >10 dB - simplifies compliance testing for Class B industrial systems. |
| Internal loop compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity. |
| NC pins between HV nodes | Improves pin-level FMEA score - mitigates risk of creepage failure in humid or contaminated environments. |
| Soft-start time | 3.5 ms to 90% of 5 V - prevents inrush current stress on input capacitors and upstream converters. |
Applications
| Factory Automation | Test and Measurement |
|---|---|
Use Scenario: Powering analog front-end circuits and isolated I/O modules in programmable logic controllers (PLCs) operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 5-V buck regulator delivering clean, regulated power to precision ADCs, DACs, and isolation drivers. Use Value: 150°C max junction rating and 42-V transient tolerance ensure uninterrupted operation during motor drive switching noise events. | Use Scenario: Supplying low-noise 5-V rails for handheld multimeters and benchtop oscilloscope auxiliary channels where standby power and EMI are critical. IC Role / Device Role / Timing Role: Standby-power-optimized DC/DC converter enabling instant wake-from-sleep functionality. Use Value: >85% efficiency at 1 mA and DRSS reduce conducted emissions, easing EMC pre-compliance screening. |
| Medical Sensors | Aerospace & Defense |
Use Scenario: Providing isolated 5-V power to wearable patient monitors and implantable device telemetry subsystems requiring long battery life and functional safety support. IC Role / Device Role / Timing Role: Safety-capable power management IC with documented failure modes for ISO 13849-1 analysis. Use Value: Functional safety documentation and 1.5 µA quiescent current extend single-cell Li-ion runtime beyond 3 years. | Use Scenario: Regulating 5-V supplies in avionics data acquisition units exposed to wide input transients (e.g., MIL-STD-704) and extreme temperature cycling. IC Role / Device Role / Timing Role: Radiation-tolerant-adjacent buck converter supporting mission-critical timing and signal conditioning. Use Value: –40°C to +150°C operation and 42-V transient rating meet DO-160 Section 16 surge requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR66420R5RXBR | 2-A output rating, identical pinout and features - higher current capability with same footprint. | Suitable for designs scaling to 2-A loads without layout change; requires larger input/output capacitance. | Select when future-proofing for higher load or margin headroom is needed without redesigning PCB. |
| TPS54202HDDCR | 2-A, 6-V max input, integrated soft-start, but no DRSS or 42-V transient rating - smaller 2.9-mm × 1.6-mm WSON package. | Better suited for low-voltage automotive body electronics; lacks industrial-grade thermal and transient robustness. | Choose only for cost-sensitive, low-input-voltage (<12 V) applications where EMI and ruggedness are secondary. |
Compared with LMR66420R5RXBR, the LMR66410R5RXBR offers lower BOM cost and thermal dissipation in 1-A applications, while TPS54202HDDCR trades industrial ruggedness for compact size and lower price in non-harsh environments.
Availability
LMR66410R5RXBR is available at Aetrix Electronics and suitable for factory automation, test and measurement, and medical sensor applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for LMR66410R5RXBR 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 power management technologies, with decades of expertise in high-reliability industrial power solutions.
The LMR664x0 product line was designed specifically for ultra-small, low-quiescent-current synchronous buck conversion in demanding industrial environments - emphasizing thermal resilience, EMI control, and functional safety readiness.
FAQ
What is the maximum input voltage the LMR66410R5RXBR can withstand without damage?
The LMR66410R5RXBR has an absolute maximum input voltage rating of 42 V, verified per TI's SNVSCJ3 datasheet Section 6.1. This transient rating applies across the full –40°C to +150°C junction temperature range and allows direct connection to unregulated 24-V or 36-V industrial rails without external overvoltage protection. Operation above 36 V is limited to short-duration transients only.
Does the LMR66410R5RXBR require external compensation components?
No, the LMR66410R5RXBR features fully internal loop compensation, confirmed in the "Miniature design size" section of the datasheet and validated in Section 7.1. This eliminates external RC networks, reduces layout sensitivity, and accelerates design completion - especially beneficial for space-constrained PCBs in industrial modules where board area is at a premium.
Can the LMR66410R5RXBR operate with a 3.3-V input supply?
No - the LMR66410R5RXBR requires a minimum input voltage of 3.6 V for startup and 3.0 V to sustain operation after startup, as specified in Section 6.3 Recommended Operating Conditions. A 3.3-V source falls below both thresholds and will not initiate or maintain regulation. For sub-3.6-V inputs, consider TI's TPS62840 or similar ultra-low-VIN buck converters.
What is the purpose of the NC pins on the LMR66410R5RXBR package?
The NC (no-connect) pins on the LMR66410R5RXBR - located at positions 2, 4, 5, 9, and 12 - are intentionally left unconnected to separate critical high-voltage nodes (e.g., VIN, SW, BOOT) and improve pin-level FMEA robustness. As stated in the "Designed for industrial applications" feature list, this layout reduces potential failure paths due to contamination, humidity, or creepage in harsh environments.
How does the LMR66410R5RXBR achieve low EMI performance?
The LMR66410R5RXBR achieves low EMI through three integrated techniques: dual-random spread spectrum (DRSS) modulation of switching frequency, an enhanced HotRod QFN package eliminating bond wires to minimize switch-node ringing, and an optimized pinout with NC guards between high-dV/dt nodes. These features collectively reduce peak radiated emissions by >10 dB, easing compliance with CISPR 11 Class B limits in industrial settings.
LMR66410R5RXBR 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:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMR66410R5RXBR FAQ
1.How can I place an order for LMR66410R5RXBR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR66410R5RXBR 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 LMR66410R5RXBR reliable?
The price and inventory of LMR66410R5RXBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR66410R5RXBR is usually 5 days.
3.What payment methods are accepted for LMR66410R5RXBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR66410R5RXBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR66410R5RXBR?
LMR66410R5RXBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR66410R5RXBR 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 LMR66410R5RXBR?
For technical support, including LMR66410R5RXBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR66410R5RXBR requirements.
6.How does Aetrix verify that LMR66410R5RXBR is sourced from the original manufacturer or authorized distributors?
All LMR66410R5RXBR 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 LMR66410R5RXBR meets industry standards.
7.What is the process for return or replacement of LMR66410R5RXBR?
All LMR66410R5RXBR units undergo pre-shipment inspection (PSI). If there is an issue with LMR66410R5RXBR, 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 LMR66410R5RXBR part is unused and in its original packaging.
Return procedure for LMR66410R5RXBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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