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Texas Instruments LMQ66410MA5RXBRQ1
- Part No.:
- LMQ66410MA5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66410MA5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 14VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMQ66410MA5RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1A output current at fixed 5V output, operating from 3.0V to 36V input with 42V load dump 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 in radar ECU power rails.
For engineers reviewing the LMQ66410MA5RXBRQ1 datasheet, LMQ66410MA5RXBRQ1 pinout, LMQ66410MA5RXBRQ1 application, or LMQ66410MA5RXBRQ1 equivalent, key selection considerations include its 400kHz fixed switching frequency, 1.5µA no-load quiescent current at 13.5VIN, integrated HotRod QFN-FCRLF package with wettable flanks, and functional safety documentation support for ASIL-B system integration.
Technical Context
The LMQ66410MA5RXBRQ1 implements peak-current-mode control with auto mode enabling frequency foldback below 1mA load, achieving >85% efficiency at 1mA and maintaining regulation down to 0.2V dropout at 1A. Its ZEN 2 switcher architecture integrates two 22-nF internal VIN bypass capacitors and a 0.1-µF internal bootstrap capacitor to minimize external component count and reduce high-frequency EMI.
It supports FPWM and PFM operation via MODE/SYNC pin configuration, includes precision enable with 0.7V wake threshold and 1.23V VOUT turn-on threshold, and features open-drain PG flag with 2.5ms activation delay and built-in deglitching. Thermal shutdown triggers at 168°C with 20°C hysteresis, and junction temperature operates from –40°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous DC output - supports radar sensor modules and infotainment subsystems without external current boosting. |
| Input Voltage Range | 3.0V to 36V after startup; withstands 42V transients - meets ISO 7637-2 Pulse 5a load dump requirements for 12V automotive systems. |
| Output Voltage | Fixed 5V - eliminates external feedback resistors and simplifies layout for USB-powered peripherals and MCU I/O rails. |
| Switching Frequency | Fixed 400kHz - avoids AM band interference while enabling compact 2.2µH inductors and low-ESR ceramic output capacitors. |
| Quiescent Current | 1.5µA at 13.5VIN, no load - enables always-on functionality in eCall and body control modules with minimal battery drain. |
| Package | RXB (VQFN-FCRLF, 14-pin), 2.6mm × 2.6mm - ultra-small footprint with wettable flanks for automated optical inspection and reliable solder joint formation. |
| EMI Reduction | Dual-random spread spectrum (DRSS) + enhanced HotRod™ QFN - achieves CISPR 25 Class 5 compliance without common-mode chokes or shielding. |
Pinout & Package
RXB package: 14-pin enhanced HotRod™ VQFN-FCRLF, 2.6mm × 2.6mm, with exposed thermal pad (GND/DAP) requiring PCB solder connection for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / UVLO input | Logic-controlled startup with 0.7V wake threshold; connects directly to VIN for simple on/off control; must not float. |
| VIN | Main input supply | Accepts 3.0–36V; internally connects two 22-nF bypass capacitors to PGND; requires external high-quality ceramic capacitor for transient suppression. |
| SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized trace area and separation from sensitive analog signals. |
| BOOT | Bootstrap supply | Internally connected 0.1-µF capacitor to SW; supplies gate drive for high-side MOSFET; must not be shorted or loaded externally. |
| VOUT/FB | Output voltage sense / feedback | Fixed 5V output - connect directly to regulated output rail; no external resistor divider required. |
| MODE/SYNC | Operating mode control | Selects Auto (PFM), FPWM, or external clock sync; rising edge triggers HS switch turn-on in SYNC mode; minimum pulse width 100ns. |
| PG | Power-good flag | Open-drain output asserting high when VOUT is within ±4.2% of target; 2.5ms delay ensures stable regulation before system release. |
| GND/DAP | Thermal & power ground | Exposed thermal pad - must be soldered to solid GND plane for thermal dissipation and noise reduction; electrically tied to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bypass & boot capacitors | Two 22-nF internal VIN bypass caps + 0.1-µF internal CBOOT eliminate four external MLCCs, reducing board area by ≥25% and EMI source impedance. |
| ZEN 2 switcher architecture | Combines DRSS, optimized pinout, and bond-wire-free HotRod QFN to suppress peak emissions - enables Class 5 compliance without input filter redesign. |
| Functional safety documentation | TI provides FIT rate data, FMEA reports, and safety analysis templates supporting ISO 26262 ASIL-B system-level certification efforts. |
| Ultra-low IQ in auto mode | 1.5µA no-load input current at 13.5VIN - extends battery life in always-on domains such as telematics and intrusion detection. |
| NC pins between HV nodes | Three dedicated NC pins isolate VIN, SW, and BOOT - improves pin-level FMEA score and reduces risk of creepage/corona failure under humidity stress. |
Applications
| Advanced Driver Assistance Systems (ADAS) | Infotainment & Digital Cluster |
|---|---|
|
Use Scenario: Powering 77GHz radar transceiver ASICs in front-corner modules requiring stable 5V at ≤1A with low EMI in proximity to RF antennas. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and interface circuitry; operates in FPWM mode during active sensing to ensure deterministic timing. Use Value: Integrated DRSS and HotRod packaging suppress conducted emissions below CISPR 25 Class 5 limits without adding ferrite beads or shielded inductors. |
Use Scenario: Supplying USB-C port controllers and display interface ICs in head units where cold-crank (3VIN) operation and load dump survival are mandatory. IC Role / Device Role / Timing Role: Secondary 5V rail generator downstream of main 12V system rail; supports 3VIN cold-crank with undervoltage lockout hysteresis. Use Value: 42V transient tolerance and –40°C to +125°C ambient rating ensure uninterrupted operation during engine start and under-hood thermal cycling. |
| Body Electronics Control Unit (BCU) | eCall Telematics Module |
|
Use Scenario: Powering LIN gateway microcontrollers and LED driver ICs in door modules where PCB space is constrained and standby current must be sub-2µA. IC Role / Device Role / Timing Role: Always-on 5V regulator enabling wake-on-LIN functionality; enters auto mode during sleep to minimize quiescent draw. Use Value: 1.5µA no-load IQ and seamless PFM/PWM transition maintain system responsiveness while extending vehicle battery life over weeks of parking. |
Use Scenario: Providing regulated 5V to GNSS receivers, cellular modems, and emergency call processors that must remain operational during battery disconnect events. IC Role / Device Role / Timing Role: Primary power source for critical safety subsystem; PG flag synchronizes modem boot sequence with valid 5V rail establishment. Use Value: Built-in PG delay (2.5ms) and hysteresis (±4.2%) prevent false resets during input ripple, eliminating need for external reset supervisor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66410MC5RXBRQ1 | Same 1A/5V fixed-output device but with 2.2MHz switching frequency instead of 400kHz. | Better suited for space-constrained layouts needing smaller inductors; higher frequency increases light-load losses and EMI above AM band. | Select LMQ66410MC5RXBRQ1 only if board area is critical and EMI filtering targets >10MHz; otherwise retain LMQ66410MA5RXBRQ1 for lower noise and higher efficiency at partial load. |
| TPS62903-Q1 | 1.2A, 5V fixed-output buck with 1.8V–6.5V input range; no integrated bypass caps; requires external CBOOT and input capacitance. | Lacks 42V transient rating and cold-crank support; limited to 12V nominal systems without upstream protection. | Choose TPS62903-Q1 only for low-voltage auxiliary rails (e.g., camera modules); LMQ66410MA5RXBRQ1 remains preferred for primary 5V conversion in full-vehicle domains. |
Compared with LMQ66410MC5RXBRQ1, the LMQ66410MA5RXBRQ1 trades higher-frequency flexibility for superior low-noise performance and higher light-load efficiency; versus TPS62903-Q1, it delivers complete automotive transient robustness and reduced BOM count via integrated capacitors - making it the optimal choice for cost-sensitive, EMI-critical ADAS and telematics power stages.
Availability
LMQ66410MA5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and eCall telematics modules requiring stable component supply across automotive production lifecycles.
Supply support for LMQ66410MA5RXBRQ1 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 LMQ664x0-Q1 product line was developed specifically for ultra-compact, low-EMI automotive power conversion - targeting radar ECUs, digital clusters, and always-on telematics where board space, thermal density, and regulatory compliance are critical constraints.
FAQ
What is the maximum input voltage the LMQ66410MA5RXBRQ1 can withstand during load dump events?
The LMQ66410MA5RXBRQ1 supports 42V absolute maximum input voltage per its Absolute Maximum Ratings table, enabling direct connection to 12V automotive battery rails without external TVS clamping for ISO 7637-2 Pulse 5a transients. 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 LMQ66410MA5RXBRQ1 require external input or bootstrap capacitors?
No - the LMQ66410MA5RXBRQ1 integrates two 22-nF VIN bypass capacitors in series between VIN and PGND, plus a 0.1-µF internal bootstrap capacitor between BOOT and SW. These eliminate the need for external high-frequency ceramic capacitors typically required for EMI suppression and gate drive stability in conventional buck converters.
How does the MODE/SYNC pin function on the LMQ66410MA5RXBRQ1?
The MODE/SYNC pin on the LMQ66410MA5RXBRQ1 selects between three modes: Auto (PFM at light loads), FPWM (fixed 400kHz), or external clock synchronization. In SYNC mode, the internal oscillator locks to an external clock signal's rising edge, enabling phase-aligned multi-rail operation without introducing beat frequencies or system-level noise coupling.
What is the typical quiescent current of the LMQ66410MA5RXBRQ1 at no load?
The LMQ66410MA5RXBRQ1 draws 1.5µA typical input current at VIN = 13.5V and zero output load in Auto mode, as specified in Section 6.6 System Characteristics. This ultra-low IQ enables compliance with automotive "always-on" power budget requirements for telematics and security modules during extended vehicle parking.
Is the LMQ66410MA5RXBRQ1 pin-compatible with other members of the LMQ664x0-Q1 family?
Yes - all LMQ664x0-Q1 variants including LMQ66410MA5RXBRQ1, LMQ66420MA5RXBRQ1, and LMQ66430MA5RXBRQ1 share identical RXB (VQFN-FCRLF, 14-pin) package dimensions, pinout, and footprint. Designers may scale output current capability via variant selection without PCB layout changes, provided thermal and inductor current ratings are verified per variant.
LMQ66410MA5RXBRQ1 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:
- 400kHz
- 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)
LMQ66410MA5RXBRQ1 FAQ
1.How can I place an order for LMQ66410MA5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66410MA5RXBRQ1 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 LMQ66410MA5RXBRQ1 reliable?
The price and inventory of LMQ66410MA5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66410MA5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66410MA5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66410MA5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66410MA5RXBRQ1?
LMQ66410MA5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66410MA5RXBRQ1 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 LMQ66410MA5RXBRQ1?
For technical support, including LMQ66410MA5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66410MA5RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66410MA5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66410MA5RXBRQ1 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 LMQ66410MA5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66410MA5RXBRQ1?
All LMQ66410MA5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66410MA5RXBRQ1, 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 LMQ66410MA5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66410MA5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66410MA5RXBRQ1 Tags
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