LMQ66420MC3RXBRQ1 - 36V 2A Low-EMI Automotive Buck | TI
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Drop-in alternatives for LMQ66420MC3RXBRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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LMQ66420MA3RXBRQ1
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →LMQ66420MB3RXBRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMQ66410MC3RXBRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMQ66410MA3RXBRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMQ66430MC3RXBRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMQ66420MC3RXBRQ1 Maximum Ratings & Electrical Characteristics
| Function | Synchronous buck step-down converter |
| Output Current | 2 A |
| Input Voltage Range | 3 V to 36 V |
| Output Voltage Configuration | Positive adjustable (fixed) 1V (3.3V) |
| Quiescent Current | 1.5 µA |
| Number of Outputs | 1 |
| Synchronous Rectification | Yes |
| Integrated VIN Bypass Capacitor | Yes |
| Integrated CBOOT Capacitor | Yes |
| EMI Mitigation | ZEN 2 ultra-low-EMI technology |
| MODE/SYNC Pin | Yes (frequency setting and synchronization) |
| Package | VQFN-FCRLF (RXB) 14 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to 150°C |
| Automotive Qualification | AEC-Q100 qualified |
| Family | LMQ664x0-Q1 |
LMQ66420MC3RXBRQ1 vqfn-fcrlf (rxb) 14 Pin Configuration Guide
Complete pinout information for LMQ66420MC3RXBRQ1 (vqfn-fcrlf (rxb) 14 package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LMQ66420MC3RXBRQ1.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LMQ66420MC3RXBRQ1 is suitable for 6 applications: Automotive ADAS Domain Controller, Automotive Infotainment and Cluster, Automotive Gateway/Telematics, Camera Module Power, Industrial 24V Distributed Power, Processor Core/IO Rails in Safety Controllers.
Automotive ADAS Domain Controller
The LMQ66420MC3RXBRQ1 efficiently steps down the 12V automotive battery to a clean 3.3V or 1V rail for ADAS SoCs. Its 36V input rating handles load-dump transients, while 2A output supports MCU/IO and sensor aggregation. The ZEN 2 low-EMI architecture and MODE/SYNC are critical for meeting CISPR 25 requirements in camera and radar compute modules. Using integrated VIN bypass and CBOOT capacitors minimizes PCB area and parasitic inductance. For processor power sequencing, pair with TDA4VL21HGAALZRQ1 and an LP87725-Q1 PMIC for multi-rail support.
Recommended
Automotive Infotainment and Cluster
Infotainment systems demand low ripple and low EMI for audio/video SoCs. The LMQ66420MC3RXBRQ1 provides up to 2A at 3.3V from a 12V bus, reducing beat frequencies with programmable switching frequency via MODE/SYNC. The synchronous design achieves high efficiency, reducing thermal load inside the cabin. Integrated CBOOT capacitor simplifies layout. This converter can power display interfaces and audio codecs while an LP87725-Q1 supervises the rail. Its AEC-Q100 qualification suits head-unit and cluster applications with extended temperature range.
Recommended
Automotive Gateway/Telematics
Always-on telematics units benefit from the 1.5µA quiescent current of the LMQ66420MC3RXBRQ1, enabling low-power standby in vehicles. The 3V to 36V input range covers cold-crank and load-dump events. The 2A output can power a gateway MCU such as AM62A1-Q1 and communication interfaces. The low-EMI ZEN 2 converter helps pass module-level emissions tests. Integrated capacitors save space in compact telematics enclosures. Pair with TPS65036x-Q1 for additional managed power rails.
Recommended
Camera Module Power
Surround-view cameras require small, low-noise power solutions in constrained housings. The LMQ66420MC3RXBRQ1's 14-pin VQFN-FCRLF package and integrated VIN bypass and CBOOT capacitors reduce the external component footprint. With 2A output and fixed 3.3V option, it can supply the imager, serializer, and signal conditioner. Its 36V input tolerance simplifies connection to battery or module pre-regulator. The ultra-low EMI characteristic reduces interference with image sensor clocking. It complements image processors and is suitable for automotive camera modules.
Recommended
Industrial 24V Distributed Power
In industrial robotics and factory controllers, 24V bus rails may see transients up to 36V. The LMQ66420MC3RXBRQ1 accepts 3V to 36V and provides 2A at 1V/3.3V for MCUs, FPGAs, and I/O. The synchronous architecture gives high efficiency, reducing heatsink requirements in sealed enclosures. The MODE/SYNC pin allows synchronizing multiple converters to a single clock, simplifying EMI compliance. Use with TMS320F280037C-Q1 or similar MCUs in PLC and motor-control I/O boards.
Recommended
Processor Core/IO Rails in Safety Controllers
Safety-critical automotive controllers require predictable power delivery. The LMQ66420MC3RXBRQ1 can power the core or I/O rail of a real-time MCU like TMS320F28P650SH-Q1 from a 12V supply. The integrated VIN bypass and CBOOT capacitors reduce switching-loop parasitics, improving output voltage transient response. The 2A rating is sufficient for MCU plus peripheral loads, while the low quiescent current supports sleep modes. AEC-Q100 qualification and pin FMEA design aid functional safety implementations; combine with a system basis chip for monitoring.
Recommended
Recommended Products Summary
Engineering reference data for LMQ66420MC3RXBRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMQ66420MA3RXBRQ1 | LMQ66420MB3RXBRQ1 | LMQ66410MC3RXBRQ1 | LMQ66430MC3RXBRQ1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-FCRLF (RXB) 14 | VQFN-FCRLF (RXB) 14 - same | VQFN-FCRLF (RXB) 14 - same | VQFN-FCRLF (RXB) 14 - same | VQFN-FCRLF (RXB) 14 - same |
| Output Current | 2 A | 2 A | 2 A | 1 A | 3 A |
| Input Voltage Range | 3V to 36V | 3V to 36V | 3V to 36V | 3V to 36V | 3V to 36V |
| Quiescent Current | 1.5 µA | 1.5 µA | 1.5 µA | 1.5 µA | 1.5 µA |
| Integrated VIN Bypass/CBOOT Capacitors | Yes | Yes | Yes | Yes | Yes |
| ZEN 2 Low-EMI Technology | Yes | Yes | Yes | Yes | Yes |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
Key Differentiators
- 2A output current in a compact 14-pin VQFN-FCRLF package with integrated capacitors (vs LMQ66410MC3RXBRQ1)
- 1.5µA quiescent current for always-on automotive loads (vs LMQ66430MC3RXBRQ1)
- ZEN 2 ultra-low-EMI technology with integrated bypass/boost capacitors (vs LMQ66420MA3RXBRQ1)
Design Notes
Place a 10µF ceramic input capacitor as close to the VIN pin as possible. The LMQ66420MC3RXBRQ1 integrates the VIN bypass and CBOOT capacitors, but the external input capacitor is still required for stability and ripple reduction. Add multiple vias to the exposed thermal pad and keep the high-frequency switching loop (VIN-SW-GND) small to realize ZEN 2 low-EMI benefits.
Use the MODE/SYNC pin to set the switching frequency or synchronize it to an external clock, avoiding noise-sensitive frequency bands in automotive systems. The ZEN 2 architecture already reduces EMI, but with a 2A buck converter, select a shielded inductor and minimize the output trace loop area to keep conducted and radiated emissions low.
At 2A output, the LMQ66420MC3RXBRQ1's power loss depends on input/output differential and switching frequency. For junction temperatures up to 150°C in automotive environments, provide a sufficient copper area connected to the VQFN-FCRLF exposed pad. Use thermal vias to an internal ground plane and calculate junction temperature using the device's thermal metrics before final layout.
Compliance Information
Automotive AEC-Q100 qualified per TI product page. RoHS/REACH/lead-free status not explicitly listed in the provided web data and should be confirmed from the latest TI datasheet and packing information.
