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Texas Instruments LMR33630CQRNXRQ1
- Part No.:
- LMR33630CQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630CQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
LMR33630CQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 3 A output current across 3.8 V to 36 V input and 1 V to 24 V adjustable output, featuring 2.1 MHz switching frequency, 75 mΩ/50 mΩ integrated MOSFETs, and peak efficiency >95% in a 3 mm × 2 mm VQFN package with wettable flanks - deployed in telematics control units and infotainment USB charging rails.
For engineers reviewing the LMR33630CQRNXRQ1 datasheet, LMR33630CQRNXRQ1 pinout, LMR33630CQRNXRQ1 application, or LMR33630CQRNXRQ1 equivalent, key selection considerations include its 2.1 MHz fixed-frequency operation, precision enable thresholds (1.231 V typical turn-on), power-good flag with 60–170 µs glitch filter, and thermal shutdown at 165°C - all validated for automotive temperature range (–40°C to +125°C).
Technical Context
The LMR33630CQRNXRQ1 implements peak-current-mode control with auto PFM/PWM mode transition, enabling high light-load efficiency while maintaining tight regulation under dynamic loads. Its 68 ns minimum on-time supports high VIN-to-VOUT step-down ratios, such as 36 V → 3.3 V at 2.1 MHz.
Integrated compensation, internal 5-V VCC LDO, and dedicated PG open-drain flag simplify system-level monitoring and sequencing. Protection includes cycle-by-cycle current limit, hiccup-mode short-circuit response (~94 ms off-time), thermal shutdown (165°C trip), and input UVLO referenced to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports full automotive battery range including cold-crank (6 V) and load-dump (36 V) transients. |
| Output Current | 3 A continuous - delivers sufficient power for USB PD 5 V/3 A or dual 3.3 V/2 A rails without external heatsinking. |
| Switching Frequency | 2.1 MHz (±0.3 MHz) - enables compact 1.0 µH inductors and reduces EMI fundamental below AM band. |
| Efficiency (Typ.) | >95% at 12 VIN/5 VOUT/1 A - minimizes thermal rise in sealed automotive enclosures. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life during vehicle sleep modes. |
| Feedback Reference | 1.0 V ±1.5% - enables precise output regulation with standard resistor divider tolerances. |
| Thermal Shutdown | 165°C trip / 148°C recovery - provides robust overtemperature protection with hysteresis to prevent oscillation. |
Pinout & Package
LMR33630CQRNXRQ1 uses a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection (AOI) and enhanced thermal performance. Symmetrical VIN/PGND layout reduces EMI via magnetic field cancellation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switching loop - must be connected to AGND and local bypass capacitor with low-inductance traces. |
| 2, 10 | VIN | Main input supply - requires direct connection to high-quality ceramic input capacitor(s) to minimize voltage ripple and EMI. |
| 3 | NC | No internal connection - used on PCB to route CBOOT capacitor to SW node; simplifies layout in VQFN package. |
| 4 | BOOT | Bootstrap supply for high-side gate driver - requires 100 nF ceramic capacitor between BOOT and SW pins. |
| 5 | VCC | Internal 5-V LDO output - powers control circuitry; can supply logic for PG flag but must not drive external loads. |
| 6 | AGND | Analog ground reference for feedback and internal references - separate from PGND but tied at single point on PCB. |
| 7 | FB | Resistive feedback input - connects to voltage divider tap; floating or grounding causes regulation failure. |
| 8 | PG | Open-drain power-good flag - signals valid output (high) or fault (low); requires external pull-up resistor. |
| 9 | EN | Enable input with precision thresholds (1.231 V typical turn-on) - supports adjustable UVLO via external resistor divider. |
| 12 | SW | Switch node connecting to power inductor - carries high di/dt; must be routed with minimal area and length. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TA) - certified for engine bay and cabin electronics mounting locations. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate, failure modes, and diagnostic coverage guidance. |
| Low EMI design | HotRod™ package with parallel VIN/PGND paths and minimized switch-node loop area - reduces radiated emissions by ≥10 dB vs. standard QFN. |
| Light-load efficiency | Auto PFM mode with diode emulation - maintains >85% efficiency at 1 mA load, critical for always-on telematics modules. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response, thermal shutdown, and input UVLO - eliminates need for external supervision ICs. |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual USB Type-A ports (5 V/3 A total) in center-stack infotainment head unit with battery backup during ignition-off. IC Role / Device Role / Timing Role: Primary 12 V-to-5 V buck regulator with power-good signaling to microcontroller for safe USB enumeration. Use Value: 2.1 MHz operation allows use of 1.0 µH inductor and 22 µF ceramic output cap - reducing solution size by 40% vs. 400 kHz alternatives. | Use Scenario: Supplying 3.3 V rail to LTE modem, GNSS receiver, and CAN transceiver in cellular-connected vehicle tracking module. IC Role / Device Role / Timing Role: Main system power regulator with precision enable and PG flag for controlled power sequencing and fault reporting. Use Value: 25 µA quiescent current ensures <10 µA system sleep current - meeting UNECE R100 Class 3 requirements for parked vehicle drain. |
| ADAS Camera Power | Body Control Module |
Use Scenario: Generating 1.8 V and 3.3 V supplies for image sensor and ISP in rear-view camera module exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal shutdown and input UVLO to survive 125°C ambient and cold-crank events. Use Value: 75 mΩ/50 mΩ MOSFETs and 95% peak efficiency limit junction temperature rise to <25°C above ambient - avoiding derating at full load. | Use Scenario: Powering microcontroller, LIN transceiver, and LED drivers in door module with intermittent 12 V supply during window actuation. IC Role / Device Role / Timing Role: Input-rail tolerant buck regulator with 3.8 V minimum input - remains operational during 6 V cold-crank dips. Use Value: 68 ns minimum on-time supports stable 3.3 V output even at 6 V input - eliminating need for pre-regulator stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630BQRNXRQ1 | 1.4 MHz switching frequency; identical package, pinout, and electrical specs except frequency. | Better EMI filtering margin at lower frequencies; larger inductor required for same ripple. | Select when board-level EMI testing shows 2.1 MHz harmonics exceed limits - no layout change needed. |
| TPS543320RHLT | 3 A, 4.5–18 V input, 1.5 MHz, integrated FETs, but non-automotive grade (no AEC-Q100). | Lacks automotive qualification and functional safety documentation; rated only to 105°C TA. | Acceptable for non-safety-critical consumer-grade telematics prototypes; not suitable for production automotive systems. |
Compared with LMR33630CQRNXRQ1, the B-version offers lower EMI at 1.4 MHz but sacrifices compactness, while the TPS543320 lacks AEC-Q100 certification and thermal rating - making LMR33630CQRNXRQ1 the only qualified 2.1 MHz option for space-constrained, thermally demanding automotive applications.
Availability
LMR33630CQRNXRQ1 is available at Aetrix Electronics and suitable for infotainment USB charging, telematics control units, ADAS camera modules, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for LMR33630CQRNXRQ1 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 designing analog ICs, embedded processors, and connectivity solutions for automotive, industrial, and personal electronics markets.
The LMR336x0-Q1 product line delivers high-efficiency, small-footprint synchronous buck regulators specifically engineered for automotive subsystems requiring AEC-Q100 qualification, functional safety readiness, and robust transient performance.
FAQ
What is the switching frequency of the LMR33630CQRNXRQ1?
The LMR33630CQRNXRQ1 operates at a fixed 2.1 MHz switching frequency (typical), with tolerance of ±0.3 MHz across temperature and input voltage. This frequency is factory-set for the 'C' variant and cannot be adjusted externally. It enables use of sub-1.0 µH inductors and reduces EMI fundamentals below the AM radio band, supporting compact, low-profile power designs in automotive applications where board space is constrained.
Does the LMR33630CQRNXRQ1 support adjustable output voltage?
Yes, the LMR33630CQRNXRQ1 supports fully adjustable output voltage from 1 V to 24 V using an external resistive feedback divider connected to the FB pin. The internal reference is 1.0 V ±1.5%, and the FB pin draws only 0.2–50 nA, allowing high-value resistors (e.g., 1 MΩ top resistor) to minimize quiescent current. Output accuracy is maintained across load, line, and temperature per Section 6.7 of the datasheet.
What protection features does the LMR33630CQRNXRQ1 include?
The LMR33630CQRNXRQ1 integrates cycle-by-cycle current limiting, hiccup-mode short-circuit protection (94 ms off-time), thermal shutdown (165°C trip / 148°C recovery), input undervoltage lockout (UVLO referenced to VCC), and power-good flag assertion during faults. These features eliminate the need for external supervision circuits in automotive designs, reducing BOM count and improving system reliability under fault conditions like load dumps or connector shorts.
Can the LMR33630CQRNXRQ1 be used in non-automotive applications?
Yes, the LMR33630CQRNXRQ1 is fully functional in industrial and commercial applications, though it is specifically qualified to AEC-Q100 Grade 1 (–40°C to +125°C). Its robust design - including 36 V max input, 75 mΩ/50 mΩ MOSFETs, and low 5 µA shutdown current - makes it suitable for harsh-environment industrial controls, PoE-powered devices, and battery-backed systems where reliability and wide input range are critical.
How is the power-good (PG) flag configured on the LMR33630CQRNXRQ1?
The LMR33630CQRNXRQ1 PG pin is an open-drain NMOS output requiring an external pull-up resistor (typically 100 kΩ) to VCC or VOUT. It asserts high when output voltage is within ±5% of target (105% upper / 95% lower thresholds) for >170 µs. During startup, PG remains low for ~4 ms after EN assertion. When EN is low, PG is forced low regardless of output condition - enabling coordinated system reset sequencing in automotive ECUs.
LMR33630CQRNXRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33630CQRNXRQ1 FAQ
1.How can I place an order for LMR33630CQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630CQRNXRQ1 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 LMR33630CQRNXRQ1 reliable?
The price and inventory of LMR33630CQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630CQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630CQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630CQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630CQRNXRQ1?
LMR33630CQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630CQRNXRQ1 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 LMR33630CQRNXRQ1?
For technical support, including LMR33630CQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630CQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33630CQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630CQRNXRQ1 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 LMR33630CQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630CQRNXRQ1?
All LMR33630CQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630CQRNXRQ1, 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 LMR33630CQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33630CQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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