My Inquiry
My Account
Texas Instruments LMQ66430MC3RXBRQ1
- Part No.:
- LMQ66430MC3RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66430MC3RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,220
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMQ66430MC3RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 3A output at fixed 3.3V, 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 radar ECU and infotainment power rails.
For engineers reviewing the LMQ66430MC3RXBRQ1 datasheet, LMQ66430MC3RXBRQ1 pinout, LMQ66430MC3RXBRQ1 application, or LMQ66430MC3RXBRQ1 equivalent, key selection criteria include its 2.2MHz fixed switching frequency, dual-random spread spectrum (DRSS), integrated capacitors reducing external BOM count, and enhanced HotRod QFN-14 package with wettable flanks for optical inspection and reliability in automotive thermal cycling.
Technical Context
The LMQ66430MC3RXBRQ1 implements peak current mode control with auto-mode frequency foldback below 1mA load, enabling ultra-low quiescent current (1.5µA at 13.5VIN) while maintaining regulation. Its ZEN 2 switcher architecture combines internal 22nF VIN bypass caps and 0.1µF CBOOT capacitor to suppress switch-node ringing and reduce conducted EMI without external filtering.
It supports three MODE/SYNC configurations: PFM/FPWM selectable auto mode, forced PWM, or external clock synchronization up to 2.5MHz. The device features NC pins between high-voltage SW and VIN to improve pin-level FMEA robustness and withstands 42V load dump and 3VIN cold-crank conditions per ISO 16750-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current automotive subsystems like radar transceivers without external current boosting. |
| Input Voltage Range | 3.0V to 36V (operating), 3.6V to 36V (start-up) - covers full automotive battery range including cold-crank (3VIN) and load dump (42V tolerant). |
| Switching Frequency | Fixed 2.2MHz - enables compact magnetics and avoids AM-band interference; supports external sync from 0.2–2.5MHz. |
| Quiescent Current | 1.5µA at 13.5VIN, no load - meets ultra-low standby power requirements for always-on ADAS modules. |
| Efficiency @ 1mA | >85% at VIN=12V, VOUT=3.3V - sustains system wakefulness during extended vehicle sleep cycles. |
| Thermal Shutdown | 158°C trip, 20°C hysteresis - protects against sustained overload in enclosed ECUs without derating. |
| Package | RXB (VQFN-FCRLF, 14-pin), 2.6mm × 2.6mm - ultra-small footprint with wettable flanks for automated optical inspection and reliable solder joints. |
Pinout & Package
RXB package is a 2.6mm × 2.6mm enhanced HotRod™ QFN-14 with wettable flanks and exposed thermal pad (GND/DAP). Pin 1 is top-left corner (EN), pin numbering follows standard counter-clockwise layout with GND/DAP centered on bottom edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / UVLO input | Logic-controlled start-up with precision thresholds (VEN-WAKE = 0.7V typ, VEN-VOUT = 1.23V); supports direct connection to VIN for simple enable. |
| VIN | Main power input | Connects to 2.7–36V source; internally ties two 22nF bypass capacitors in series to PGND - reduces need for external bulk capacitance. |
| VOUT/FB | Output voltage sense / feedback | Fixed 3.3V output configuration; FB node accessible for adjustable variants - requires no external resistor divider in this variant. |
| SW | Switch node | Drives external power inductor; optimized low-inductance path minimizes ringing due to bond-wire-free HotRod construction. |
| BOOT | Bootstrap supply | Internally connects 0.1µF capacitor to SW - eliminates external bootstrap cap and routing complexity. |
| PG | Open-drain power-good flag | Indicates regulation status with 2.5ms delay; supports reset supervision elimination in radar and cluster systems. |
| MODE/SYNC | Mode selection / clock sync | Selects PFM/FPWM or synchronizes to external clock up to 2.5MHz - critical for noise-sensitive infotainment timing. |
| GND/DAP | Power ground / thermal pad | Exposed thermal pad must be soldered to PCB ground plane - provides primary thermal path (RθJB = 26.2°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| ZEN 2 switcher architecture | Integrates 2×22nF VIN bypass caps + 0.1µF CBOOT capacitor - cuts external passive count by ≥3 components and shrinks input filter area by 40%. |
| Dual-random spread spectrum (DRSS) | Reduces peak EMI emissions by >10dB - enables CISPR 25 Class 5 compliance without common-mode chokes or shielding. |
| Enhanced HotRod QFN package | Eliminates bond wires and minimizes parasitic inductance - suppresses switch-node ringing and improves EMI margin across temperature. |
| NC pins between SW and VIN | Improves pin-level FMEA score - prevents single-point failure paths in high-voltage domains critical for ASIL-B systems. |
| Auto-mode frequency foldback | Reduces switching frequency under light load while maintaining regulation - achieves 1.5µA IQ and >85% efficiency at 1mA. |
Applications
| Advanced Driver Assistance Systems (ADAS) | Infotainment Head Unit |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoC requiring stable 3.3V at up to 2.5A during chirp bursts, with <1.5µA sleep current to meet ISO 26262 ASIL-B power budget. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic and ADC reference voltage; maintains regulation during 42V load dump transients. Use Value: Integrated bypass caps and DRSS eliminate need for external EMI filters - reduces radar ECU board area by 12mm² and passes CISPR 25 Class 5 without shielding. |
Use Scenario: Supplies 3.3V to application processor, display interface, and audio codec in automotive head unit with variable load (10mA–2.8A) and strict AM-band noise limits. IC Role / Device Role / Timing Role: Main PMIC rail generator; synchronized via MODE/SYNC pin to avoid interference with FM/AM radio receivers. Use Value: 2.2MHz fixed frequency + DRSS ensures switching harmonics stay above 1.8MHz - avoids AM band (0.53–1.71MHz) and simplifies EMC validation. |
| Body Control Module (BCM) | eCall Telematics Unit |
Use Scenario: Powers microcontroller, CAN transceiver, and LED drivers in door module where space is constrained and ambient temperature reaches +105°C. IC Role / Device Role / Timing Role: Compact, thermally robust 3.3V supply; leverages NC pins and 150°C junction rating for long-term reliability in sealed enclosures. Use Value: 2.6mm × 2.6mm RXB package fits within 3.0mm × 3.0mm keep-out zone - enables 2-layer PCB design and reduces assembly cost vs. larger QFN alternatives. |
Use Scenario: Provides always-on 3.3V rail for GNSS receiver, cellular modem, and emergency call controller with 10-year field life requirement. IC Role / Device Role / Timing Role: Low-IQ backup regulator supporting battery-only operation during ignition-off; PG flag triggers system wake-up on valid voltage. Use Value: 1.5µA shutdown current extends 12V battery life beyond 18 months in parked state - exceeds UNECE R155 eCall standby duration mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460-Q1 | 3.5A rated, 2.1MHz fixed freq, no integrated bypass caps, larger 3.5mm × 3.5mm VQFN | Requires external 22nF VIN bypass and 0.1µF CBOOT - increases BOM count and layout sensitivity to EMI | Choose when higher current headroom is needed and board space allows larger package; not drop-in due to pinout and capacitor requirements. |
| TPS62903-Q1 | 3A rated, 1.8–4MHz programmable freq, no integrated capacitors, 2.5mm × 3.0mm VQFN | Lacks DRSS and integrated caps - needs external spread-spectrum IC or complex filter design for CISPR 25 Class 5 | Prefer for designs requiring frequency agility across wide range; requires additional EMI mitigation effort versus LMQ66430MC3RXBRQ1's integrated solution. |
Compared with LMQ66430MC3RXBRQ1, LM61460-Q1 offers higher current but demands more external passives and occupies 50% more area, while TPS62903-Q1 provides frequency flexibility at the cost of added EMI design complexity - LMQ66430MC3RXBRQ1 delivers lowest system-level BOM count and smallest footprint for fixed 3.3V/3A automotive rails.
Availability
LMQ66430MC3RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body electronics requiring stable component supply with AEC-Q100 qualification and automotive lifecycle support.
Supply support for LMQ66430MC3RXBRQ1 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 over 40 years of automotive qualification expertise.
The LMQ664x0-Q1 product line was designed specifically for ultra-compact, low-EMI, always-on power conversion in radar, camera, and telematics ECUs - prioritizing integrated capacitors, spread-spectrum control, and AEC-Q100 Grade 1 reliability.
FAQ
What is the maximum input voltage transient the LMQ66430MC3RXBRQ1 can withstand?
The LMQ66430MC3RXBRQ1 supports 42V transient input voltage per ISO 16750-2 load dump testing. Its absolute maximum VIN rating is 42V, and it maintains regulation during these events without latch-up or damage when used with proper input filtering and layout per TI's LMQ66430-Q1 layout guidelines. This capability is verified across –40°C to +150°C junction temperature.
Does the LMQ66430MC3RXBRQ1 require external input bypass capacitors?
No - the LMQ66430MC3RXBRQ1 integrates two 22nF capacitors internally between VIN and PGND, eliminating the need for external high-frequency input bypass caps. A single high-quality 10µF ceramic capacitor is still recommended at the VIN pin for bulk energy storage, but the integrated caps handle >90% of high-frequency noise suppression required for CISPR 25 Class 5 compliance.
How does the MODE/SYNC pin function on the LMQ66430MC3RXBRQ1?
The MODE/SYNC pin on the LMQ66430MC3RXBRQ1 supports three modes: Auto (PFM/FPWM selectable), FPWM (forced pulse-width modulation), or external clock synchronization up to 2.5MHz. In SYNC mode, the internal oscillator locks to the rising edge of the external clock signal - preserving regulation accuracy while aligning switching edges across multiple rails in infotainment or ADAS domain controllers.
What is the thermal performance of the LMQ66430MC3RXBRQ1 in a typical 2-layer PCB layout?
In a standard 2-layer JEDEC board (2oz copper, 1in² thermal pad), the LMQ66430MC3RXBRQ1 exhibits RθJA ≈ 66.1°C/W. With proper thermal vias (≥8×0.3mm) connecting the GND/DAP pad to inner ground planes, junction-to-board resistance drops to 26.2°C/W. At 3A load and 25°C ambient, measured junction temperature remains ≤115°C - well below the 150°C max rating.
Is the LMQ66430MC3RXBRQ1 pin-compatible with other members of the LMQ664x0-Q1 family?
Yes - all LMQ664x0-Q1 variants (LMQ66410/20/30) share identical RXB 14-pin VQFN-FCRLF packaging, pinout, and footprint. The LMQ66430MC3RXBRQ1 can be substituted for LMQ66420MC3RXBRQ1 or LMQ66410MC3RXBRQ1 on the same PCB without layout changes, though output current capability and current-limit thresholds differ per variant.
LMQ66430MC3RXBRQ1 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:
- 3A
- Frequency - Switching:
- 200kHz ~ 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)
LMQ66430MC3RXBRQ1 FAQ
1.How can I place an order for LMQ66430MC3RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66430MC3RXBRQ1 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 LMQ66430MC3RXBRQ1 reliable?
The price and inventory of LMQ66430MC3RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66430MC3RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66430MC3RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66430MC3RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66430MC3RXBRQ1?
LMQ66430MC3RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66430MC3RXBRQ1 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 LMQ66430MC3RXBRQ1?
For technical support, including LMQ66430MC3RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66430MC3RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66430MC3RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66430MC3RXBRQ1 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 LMQ66430MC3RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66430MC3RXBRQ1?
All LMQ66430MC3RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66430MC3RXBRQ1, 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 LMQ66430MC3RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66430MC3RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66430MC3RXBRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
