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Texas Instruments LMQ66410MC5RXBRQ1
- Part No.:
- LMQ66410MC5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66410MC5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,700
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Product details
Overview
LMQ66410MC5RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1A output at fixed 5V, operating from 3.0V to 36V input with 42V transient tolerance. It integrates VIN bypass and CBOOT capacitors, uses peak current mode control, and achieves >85% efficiency at 1mA for always-on systems such as radar ECUs and eCall modules.
For engineers reviewing the LMQ66410MC5RXBRQ1 datasheet, LMQ66410MC5RXBRQ1 pinout, LMQ66410MC5RXBRQ1 application, or LMQ66410MC5RXBRQ1 equivalent, key selection criteria include its 2.2MHz fixed switching frequency, integrated EMI-reduction features (DRSS, HotRod QFN), ultra-low 1.5µA no-load quiescent current, and functional safety documentation support.
Technical Context
The LMQ66410MC5RXBRQ1 employs peak current mode control with auto-mode frequency foldback, enabling seamless PWM-to-PFM transition and maintaining regulation down to 1.5µA input current. Its ZEN 2 switcher architecture integrates dual 22-nF VIN bypass capacitors and a 0.1-µF CBOOT capacitor internally, eliminating external placement while reducing high-frequency EMI.
It supports 400kHz or 2.2MHz fixed-frequency operation (this variant is 2.2MHz), offers MODE/SYNC pin for external clock synchronization or PFM/FPWM mode selection, and includes precision enable thresholds (VEN-VOUT = 1.23V typ), thermal shutdown (168°C trip), and power-good flag with 2.5ms activation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports compact power rails in ADAS sensors and infotainment subsystems without external current sensing. |
| Input Voltage Range | 3.0 V to 36 V - withstands automotive cold-crank (3V) and load-dump (42V transient) conditions without external protection. |
| Output Voltage | Fixed 5.00 V ±0.6% - eliminates external feedback resistors and simplifies layout for USB-powered peripherals or MCU I/O rails. |
| Switching Frequency | 2.2 MHz (fixed) - enables use of small 1–2.2 µH inductors and avoids AM-band interference in vehicle audio systems. |
| Quiescent Current | 1.5 µA at 13.5 VIN, no load - extends battery life in always-on domains like telematics and body controllers. |
| Package | RXB (VQFN-FCRLF, 14-pin, 2.6 mm × 2.6 mm) - wettable flanks enable automated optical inspection; enhanced HotRod construction minimizes switch-node ringing. |
| EMI Features | Dual Random Spread Spectrum (DRSS) + optimized pinout + integrated capacitors - reduces peak emissions to meet CISPR 25 Class 5 without common-mode chokes. |
Pinout & Package
RXB package: 14-pin enhanced HotRod™ VQFN-FCRLF (2.6 mm × 2.6 mm) with exposed thermal pad (GND/DAP). Wettable flanks and corner anchor pins ensure reliable solder joint inspection and mechanical robustness in automotive thermal cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable input with precision UVLO | Starts regulation when VIN ≥ 3.35 V; shuts down below 2.7 V; supports direct connection to VIN for simple on/off control. |
| 2 NC | No internal connection | Isolation between high-voltage pins improves pin-level FMEA reliability; must remain unconnected. |
| 3 VIN | Main input supply | Internally connects to two series 22-nF bypass caps; requires external low-ESR ceramic cap for full transient suppression. |
| 4 NC | Midpoint of internal VIN bypass chain | Floating node - no external connection; enhances internal capacitor voltage sharing under transients. |
| 5 NC | Midpoint of internal VIN bypass chain | Floating node - no external connection; ensures balanced stress across integrated capacitors. |
| 6 PGND | Power ground return | Low-inductance path for high di/dt currents; must connect to system GND with short, wide copper pour. |
| 7 SW | Switch node | Connects to inductor; fast edge rates demand tight layout; minimized ring due to HotRod bondless construction. |
| 8 BOOT | Bootstrap supply for HS driver | Internally connected to SW via 0.1-µF capacitor; no external component required - reduces BOM count and layout area. |
| 9 NC | No internal connection | Provides spacing between SW and VCC; improves isolation and reduces coupling in high-noise environments. |
| 10 VCC | Internal LDO output | 3.3 V ±3% supply for control circuitry; can power logic-level PG pull-up; requires 1-µF local decoupling. |
| 11 VOUT/FB | Fixed 5V output / feedback node | Direct connection to output for fixed-VOUT operation; no resistor divider needed - eliminates tuning error and drift. |
| 12 NC | No internal connection | Separates VOUT/FB from MODE/SYNC; prevents noise coupling into feedback path during sync events. |
| 13 MODE/SYNC | Mode selection or external clock input | Pull low for Auto (PFM), pull high for FPWM, or drive with 0.2–2.5 MHz clock for synchronized operation. |
| 14 PG | Open-drain power-good flag | Asserts high after 2.5 ms soft-start; indicates VOUT within ±4.2% of 5V; enables system reset sequencing without external supervisor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VIN bypass & CBOOT capacitors | Eliminates two external 0.1-µF ceramics and one 22-nF pair - reduces board area by ≥1.5 mm² and EMI filter complexity. |
| ZEN 2 switcher architecture | Combines DRSS, optimized pinout, and bondless HotRod QFN to achieve CISPR 25 Class 5 compliance without shielding or chokes. |
| Auto-mode frequency foldback | Reduces switching frequency at light loads while maintaining regulation - delivers 1.5 µA no-load IQ and >85% efficiency at 1 mA. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C ambient (–40°C to +150°C junction); supports 42V load dump and 3V cold crank per ISO 16750-2. |
| Enhanced HotRod™ QFN with wettable flanks | Enables AOI-compatible solder joints and superior thermal performance (RθJA = 66.1°C/W on 4-layer PCB). |
Applications
| Radar ECU Power | eCall Module Supply |
|---|---|
|
Use Scenario: Powers 77-GHz radar transceiver ASICs requiring stable 5V at ≤500 mA with ultra-low standby current during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary buck regulator providing always-on 5V rail; manages wake-up via EN pin and reports readiness via PG flag. Use Value: 1.5 µA quiescent current extends battery hold-up time beyond 120 days; integrated capacitors reduce layout sensitivity to board vibration. |
Use Scenario: Supplies 5V to LTE modem, GNSS receiver, and emergency button interface in automotive eCall telematics units. IC Role / Device Role / Timing Role: Main system power IC with precise enable threshold and power-good signaling for safe boot sequencing. Use Value: Fixed 5V output eliminates calibration drift; 42V transient tolerance avoids need for upstream TVS diodes in harsh battery environments. |
| Instrument Cluster Display Logic | Body Control Module I/O Rail |
|
Use Scenario: Generates 5V for TFT display controller, touch interface, and backlight driver in digital instrument clusters. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter supporting dynamic brightness scaling and rapid wake-from-sleep transitions. Use Value: 2.2MHz switching allows use of 1.5 µH shielded inductor - minimizing magnetic coupling into analog sensor traces near cluster PCB. |
Use Scenario: Provides regulated 5V for LIN transceivers, LED drivers, and door module microcontrollers in body electronics. IC Role / Device Role / Timing Role: Compact, robust DC/DC stage replacing discrete LDO + external buck solutions in space-constrained modules. Use Value: NC pins between SW and VOUT/FB suppress fault propagation during ESD events; AEC-Q100 qualification ensures field reliability over 15-year vehicle life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 2.5A output, 4.2V–36V input, 2.1MHz fixed freq, no integrated bypass caps, requires external 0.1µF CBOOT | Higher current capability but larger solution size; lacks integrated capacitors and DRSS - needs additional EMI filtering for Class 5 compliance | Select when >1A output or adjustable VOUT is required; not drop-in due to different pinout and external capacitor dependencies |
| TPS62903-Q1 | 3A output, 3V–18V input, 1.8MHz/3.6MHz selectable, integrated CBOOT only, no VIN bypass caps, 2.5µA IQ | Narrower input range excludes 24V/42V systems; higher IQ than LMQ66410MC5RXBRQ1; no DRSS or HotRod EMI optimization | Prefer for lower-input, higher-current applications where 42V tolerance is unnecessary; requires redesign for automotive load-dump immunity |
Compared with LMQ66410MC5RXBRQ1, LM61480QRNXTQ1 offers higher current but increases BOM count and EMI design effort, while TPS62903-Q1 trades input range and EMI performance for slightly higher efficiency at mid-load - neither matches the integrated capacitor + DRSS + HotRod combination that enables minimal-footprint CISPR 25 Class 5 compliance.
Availability
LMQ66410MC5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body electronics requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for LMQ66410MC5RXBRQ1 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 ICs, with decades of automotive qualification expertise and functional safety development infrastructure.
The LMQ664x0-Q1 product line targets ultra-compact, low-EMI power conversion for next-generation automotive electronics - specifically engineered to replace multi-component buck solutions in radar, telematics, and digital cockpit applications.
FAQ
What is the maximum input voltage transient the LMQ66410MC5RXBRQ1 can withstand?
The LMQ66410MC5RXBRQ1 supports 42V input transients per ISO 16750-2, enabling direct connection to automotive battery rails without external TVS diodes. This rating applies across its full operating temperature range (–40°C to +125°C ambient) and is validated per AEC-Q100 stress testing protocols. The device remains functional during load-dump events and recovers automatically once voltage returns within spec.
Does the LMQ66410MC5RXBRQ1 require external bootstrap or input bypass capacitors?
No - the LMQ66410MC5RXBRQ1 integrates both a 0.1-µF bootstrap capacitor (between BOOT and SW) and two 22-nF VIN bypass capacitors (in series between VIN and PGND) internally. These eliminate the need for external CBOOT and reduce required input capacitance, directly contributing to its 2.6 mm × 2.6 mm solution size and Class 5 EMI performance.
How does the MODE/SYNC pin function on the LMQ66410MC5RXBRQ1?
The MODE/SYNC pin on the LMQ66410MC5RXBRQ1 supports three configurations: pulled low for Auto mode (PFM at light loads), pulled high for FPWM mode (fixed 2.2MHz), or driven with a 0.2–2.5 MHz external clock for synchronization. It uses an internal PLL to lock phase without glitches, preserving regulation during sync transitions - critical for noise-sensitive infotainment systems.
What is the typical quiescent current of the LMQ66410MC5RXBRQ1 at no load?
The LMQ66410MC5RXBRQ1 draws 1.5 µA typical input current at 13.5VIN, 5VOUT, and zero load in Auto mode - verified across temperature (–40°C to +125°C). This ultra-low IQ enables multi-year battery hold-up in always-on vehicle domains such as telematics and remote keyless entry receivers.
Is the LMQ66410MC5RXBRQ1 pin-compatible with other members of the LMQ664x0-Q1 family?
Yes - all LMQ664x0-Q1 variants (1A/2A/3A, 3.3V/5V, 400kHz/2.2MHz) share identical RXB package, pinout, and footprint. Only output current rating, fixed VOUT, and switching frequency differ; no PCB redesign is needed when scaling power or adjusting frequency within the family.
LMQ66410MC5RXBRQ1 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):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMQ66410MC5RXBRQ1 FAQ
1.How can I place an order for LMQ66410MC5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66410MC5RXBRQ1 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 LMQ66410MC5RXBRQ1 reliable?
The price and inventory of LMQ66410MC5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66410MC5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66410MC5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66410MC5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66410MC5RXBRQ1?
LMQ66410MC5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66410MC5RXBRQ1 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 LMQ66410MC5RXBRQ1?
For technical support, including LMQ66410MC5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66410MC5RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66410MC5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66410MC5RXBRQ1 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 LMQ66410MC5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66410MC5RXBRQ1?
All LMQ66410MC5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66410MC5RXBRQ1, 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 LMQ66410MC5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66410MC5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66410MC5RXBRQ1 Tags
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