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Texas Instruments LMQ66410MA3RXBRQ1
- Part No.:
- LMQ66410MA3RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66410MA3RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,977
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Product details
Overview
LMQ66410MA3RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 1A output current at fixed 3.3V, operating from 3.0V to 36V input with 400kHz fixed switching frequency, integrated VIN bypass and CBOOT capacitors, and optimized for radar ECU and infotainment head unit power rails.
For engineers reviewing the LMQ66410MA3RXBRQ1 datasheet, LMQ66410MA3RXBRQ1 pinout, LMQ66410MA3RXBRQ1 application, or LMQ66410MA3RXBRQ1 equivalent, key selection criteria include its 150°C junction rating, 1.5µA no-load quiescent current in Auto mode, ZEN 2 low-EMI architecture with dual-random spread spectrum, and enhanced HotRod QFN-14 (2.6mm × 2.6mm) package with wettable flanks.
Technical Context
The LMQ66410MA3RXBRQ1 implements peak-current-mode control with frequency foldback in Auto mode, enabling seamless PWM-to-PFM transition and maintaining >85% efficiency at 1mA load. Its internal compensation, integrated 22nF VIN bypass capacitors (in series), and 0.1µF CBOOT capacitor eliminate external components required for EMI suppression and bootstrap operation.
ZEN 2 switcher architecture combines enhanced HotRod QFN packaging (bond-wire-free, minimized switch-node ringing), NC pins between high-voltage nodes for FMEA robustness, and DRSS dithering to meet CISPR 25 Class 5 emissions limits without common-mode chokes. The MODE/SYNC pin supports FPWM mode selection or external clock synchronization up to 2.5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports always-on automotive modules requiring stable low-power rail |
| Input Voltage Range | 3.0V to 36V (after start-up); withstands 42V load dump - eliminates need for upstream TVS in 12V/24V systems |
| Switching Frequency | Fixed 400kHz - enables use of smaller magnetics than 2.2MHz variants while avoiding AM band interference |
| Quiescent Current | 1.5µA at 13.5VIN, no load, Auto mode - extends battery life in vehicle-off scenarios |
| Output Voltage | Fixed 3.3V ±0.9% over –40°C to +125°C - meets tight regulation needs for MCU and sensor supplies |
| Junction Temperature | –40°C to +150°C - qualified for under-hood and radar ECU placement per AEC-Q100 Grade 1 |
| Package | RXB (VQFN-FCRLF, 14-pin), 2.6mm × 2.6mm - ultra-small footprint with wettable flanks for automated optical inspection |
Pinout & Package
RXB package: 14-pin enhanced HotRod™ VQFN-FCRLF, 2.6mm × 2.6mm, with exposed thermal pad (GND/DAP) requiring solder connection to PCB ground plane for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / UVLO input | Logic-controlled startup; precision threshold (1.23V typ) allows direct VIN tie or microcontroller GPIO drive; must not float |
| VIN | Main input supply | Internally connects to two 22nF bypass capacitors in series to PGND; supports 42V transients without external clamping |
| SW | Switch node | Connects to power inductor; low-inductance HotRod layout minimizes ringing and EMI generation |
| BOOT | Bootstrap supply | Internally connected to SW via 0.1µF capacitor - eliminates external boot cap and routing complexity |
| VOUT/FB | Output voltage sense / feedback | Fixed 3.3V configuration - connect directly to output; no external resistors required |
| MODE/SYNC | Mode selection / clock sync | Selects Auto (PFM) or FPWM mode; accepts external 0.2–2.5MHz clock for synchronized multi-rail systems |
| PG | Power-good flag | Open-drain output with 2.5ms delay and 100Ω on-resistance - replaces external reset supervisor in many designs |
| GND/DAP | Power ground / thermal pad | Exposed pad must be soldered to solid GND plane for thermal dissipation (RθJB = 26.2°C/W) and noise control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VIN bypass & CBOOT caps | Two 22nF internal series bypass caps + 0.1µF internal boot cap reduce BOM count by 3 passive components and shrink input filter area |
| ZEN 2 low-EMI architecture | Dual-random spread spectrum + bond-wire-free HotRod QFN enable CISPR 25 Class 5 compliance without shielding or CM chokes |
| Ultra-low IQ in Auto mode | 1.5µA typical shutdown current and light-load PFM operation extend battery runtime in always-on ADAS modules |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient, 150°C junction, 42V load dump, and 3VIN cold crank - suitable for front-end radar ECUs |
| NC pin isolation between HV nodes | Dedicated no-connect pins placed between VIN, SW, and BOOT improve pin-level FMEA and prevent creepage-related field failures |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Supplies 3.3V to 77GHz radar transceiver SoCs in compact front-bumper modules where space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, low-noise 3.3V rail with fast transient response and minimal EMI impact on RF front-end. Use Value: Integrated bypass/boost caps and ZEN 2 architecture eliminate discrete filtering components, reducing solution size by >30% versus comparable converters. |
Use Scenario: Powers application processors and display interfaces in automotive head units requiring always-on wake-up capability and low standby consumption. IC Role / Device Role / Timing Role: System power manager delivering regulated 3.3V with programmable soft-start and power-good signaling for sequenced boot. Use Value: 1.5µA quiescent current and Auto mode PFM operation extend vehicle-off battery life beyond 120 days without recharge. |
| eCall Module Backup Power | Body Control Module Sensor Interface |
|
Use Scenario: Provides isolated 3.3V rail for cellular modem and GNSS receiver in eCall emergency systems that must operate during main battery failure. IC Role / Device Role / Timing Role: Secondary regulated supply backed by supercapacitor or backup battery, supporting 42V load dump immunity and cold-crank operation. Use Value: 36V max input rating and support for 3VIN cold crank (down to 3.0V) ensure uninterrupted operation during engine start events. |
Use Scenario: Powers LIN transceivers, ambient light sensors, and door module MCUs in body electronics where reliability across temperature extremes is critical. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with NC-pin isolation and best-in-class pin FMEA for long-life automotive deployments. Use Value: AEC-Q100 Grade 1 qualification and 150°C junction rating allow direct mounting on dense PCBs without derating or heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66410MC3RXBRQ1 | Same 1A/3.3V spec but fixed 2.2MHz switching frequency - higher frequency enables smaller inductors but increases switching losses at heavy loads | Better suited for space-constrained infotainment modules where inductor size dominates board area | Select LMQ66410MC3RXBRQ1 when minimizing magnetic component volume is prioritized over light-load efficiency |
| TPS62933QRVCRQ1 | 1.5A, 3.3V fixed, 2.2MHz, lower IQ (700nA), but no integrated bypass/BOOT caps - requires 3 external capacitors | Targeted at ultra-low-power telematics modules needing sub-1µA shutdown, with less stringent EMI requirements | Select TPS62933QRVCRQ1 only if system-level EMI testing passes without integrated capacitors and board space permits added passives |
Compared with LMQ66410MC3RXBRQ1 and TPS62933QRVCRQ1, the LMQ66410MA3RXBRQ1 uniquely balances 400kHz operation for optimal efficiency across 1mA–1A loads, integrated EMI-reduction capacitance, and AEC-Q100-compliant thermal robustness - making it the preferred choice for radar and body-control power stages where reliability and solution size are co-prioritized.
Availability
LMQ66410MA3RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (radar ECU), infotainment head units, eCall modules, and body control units requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for LMQ66410MA3RXBRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive power management ICs and functional safety design resources.
The LMQ664x0-Q1 product line was developed specifically for ultra-compact, low-EMI automotive DC/DC conversion in radar, infotainment, and body electronics - emphasizing integrated passive reduction, AEC-Q100 compliance, and ZEN 2 EMI mitigation.
FAQ
What is the maximum input voltage the LMQ66410MA3RXBRQ1 can withstand during load dump events?
The LMQ66410MA3RXBRQ1 supports 42V transients on the VIN pin, meeting ISO 7637-2 Pulse 5a requirements for 12V automotive systems. This rating is validated per AEC-Q100 stress testing and allows direct connection to battery rails without upstream TVS diodes in most implementations. The absolute maximum VIN rating remains 42V, and operation above this level risks permanent damage to the LMQ66410MA3RXBRQ1.
Does the LMQ66410MA3RXBRQ1 require external input or bootstrap capacitors?
No, the LMQ66410MA3RXBRQ1 integrates two 22nF VIN bypass capacitors in series between VIN and PGND, plus a 0.1µF internal bootstrap capacitor between BOOT and SW. These integrations eliminate the need for external high-frequency input filtering and boot capacitor placement, reducing total solution size and simplifying layout. External bulk capacitance is still recommended at VIN for low-frequency energy storage.
How does the MODE/SYNC pin function on the LMQ66410MA3RXBRQ1?
The MODE/SYNC pin on the LMQ66410MA3RXBRQ1 serves three functions: (1) logic-level input to select Auto (PFM) or FPWM mode, (2) synchronization input accepting 0.2–2.5MHz external clocks for multi-rail phase alignment, and (3) trigger for FPWM-only operation during light loads. It uses a PLL-based locking scheme to avoid glitches and maintains regulation even during frequency foldback transitions.
What is the typical quiescent current of the LMQ66410MA3RXBRQ1 at no load?
The LMQ66410MA3RXBRQ1 draws 1.5µA typical input current at VIN when unloaded and operating in Auto mode at 13.5V input and 3.3V output. This ultra-low IQ enables extended vehicle-off battery life in always-on ADAS modules. Shutdown current drops further to 0.25µA when EN is pulled low, verified across –40°C to +125°C ambient conditions.
Is the LMQ66410MA3RXBRQ1 pin-compatible with other members of the LMQ664x0-Q1 family?
Yes, all LMQ664x0-Q1 variants - including LMQ66410MA3RXBRQ1, LMQ66420MA3RXBRQ1, and LMQ66430MA3RXBRQ1 - share identical RXB (VQFN-FCRLF, 14-pin) packaging, pinout, and footprint. This allows scalable power design: a single PCB layout can support 1A, 2A, or 3A versions by changing only the IC and output inductor, simplifying platform development and inventory management for the LMQ66410MA3RXBRQ1 and its siblings.
LMQ66410MA3RXBRQ1 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 (3.3V)
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz
- 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)
LMQ66410MA3RXBRQ1 FAQ
1.How can I place an order for LMQ66410MA3RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66410MA3RXBRQ1 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 LMQ66410MA3RXBRQ1 reliable?
The price and inventory of LMQ66410MA3RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66410MA3RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66410MA3RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66410MA3RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66410MA3RXBRQ1?
LMQ66410MA3RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66410MA3RXBRQ1 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 LMQ66410MA3RXBRQ1?
For technical support, including LMQ66410MA3RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66410MA3RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66410MA3RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66410MA3RXBRQ1 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 LMQ66410MA3RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66410MA3RXBRQ1?
All LMQ66410MA3RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66410MA3RXBRQ1, 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 LMQ66410MA3RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66410MA3RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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