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Texas Instruments LMR33630APAQRNXRQ1
- Part No.:
- LMR33630APAQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630APAQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
LMR33630APAQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3 A output current from a 3.8 V–36 V input, with adjustable 1 V–24 V output voltage, 400 kHz switching frequency, and integrated 75 mΩ/50 mΩ MOSFETs - deployed in infotainment power rails and telematics control units.
For engineers reviewing the LMR33630APAQRNXRQ1 datasheet, LMR33630APAQRNXRQ1 pinout, LMR33630APAQRNXRQ1 application, or LMR33630APAQRNXRQ1 equivalent, key selection considerations include its AEC-Q100 qualification, 68 ns minimum on-time, 25 µA operating quiescent current, power-good flag with glitch filtering, and thermal shutdown at 165°C.
Technical Context
This peak-current-mode buck regulator operates in auto mode, dynamically transitioning between PWM (constant-frequency) and PFM (diode-emulation DCM) based on load to maintain >95% peak efficiency across light-to-heavy loads. It integrates internal compensation, precision enable thresholds (1.231 V typical turn-on), and a reference-based soft-start (4 ms typical).
Protection architecture includes cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165°C trip / 148°C recovery), input UVLO via VCC monitoring, and zero-current detection for light-load efficiency. The HotRod™ VQFN package enables low-EMI layout via symmetrical VIN/PGND pins and wettable flanks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide automotive battery transients including cold-crank (4.5 V) and load-dump (36 V). |
| Output Current | 3 A continuous - rated for sustained operation under full load at TA = 125°C with proper PCB thermal design. |
| Switching Frequency | 400 kHz - balances EMI performance, inductor size, and efficiency; fixed-frequency PWM at heavy loads. |
| Quiescent Current | 25 µA - enables always-on systems (e.g., CAN wake-up circuits) without excessive battery drain. |
| Min On-Time | 68 ns - allows high step-down ratios (e.g., 24 V → 3.3 V at 400 kHz) without pulse-skipping instability. |
| Power-Good Flag | Open-drain PG with 105–110% rising threshold and 60–170 µs glitch filter - provides reliable system reset signaling during line/load transients. |
| Thermal Shutdown | 165°C trip temperature with 17°C hysteresis - protects silicon integrity during sustained overload or poor heatsinking. |
Pinout & Package
The LMR33630APAQRNXRQ1 uses a 12-pin 3.0 mm × 2.0 mm × 0.85 mm VQFN package (RNX) with wettable flanks for automated optical inspection and enhanced thermal performance. Package features symmetrical VIN/PGND pins to reduce loop inductance and EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground and AGND with short, wide copper pours; bypass capacitor return path. |
| 2, 10 | VIN | Main input supply - requires direct connection to high-quality input capacitors; dual pins reduce IR drop and improve transient response. |
| 3 | NC | No internal connection - used on PCB to simplify CBOOT routing to SW; must not be connected to any net. |
| 4 | BOOT | Bootstrap supply - connects via 100 nF capacitor to SW; enables high-side gate drive; critical for stable 100% duty-cycle capability. |
| 5 | VCC | Internal 5-V LDO output - powers internal logic; not for external loading; requires 1 µF ceramic capacitor to AGND. |
| 6 | AGND | Analog ground reference - star-point for FB, PG, EN; separate from PGND but tied at single point on PCB. |
| 7 | FB | Feedback input - senses output via resistor divider; 1.0 V nominal reference; 0.2–50 nA bias current enables high-impedance dividers. |
| 8 | PG | Open-drain power-good flag - signals regulation status; requires external pull-up; asserts low during faults or EN = low. |
| 9 | EN | Enable input - precision thresholds (1.231 V typical ON); supports external UVLO using resistor divider; must not float. |
| 12 | SW | Switch node - connects to power inductor; high dv/dt node; must be routed with minimal area and adjacent to BOOT/CBOOT. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and stress-test requirements for infotainment and telematics. |
| Integrated high- and low-side MOSFETs | 75 mΩ HS / 50 mΩ LS RDS(on) - eliminates external FETs and drivers, reducing BOM count and layout complexity. |
| Auto PFM/PWM mode transition | Seamless light-load efficiency boost - maintains >85% efficiency at 1 mA while delivering >95% at full load. |
| HotRod™ VQFN with wettable flanks | Low parasitic inductance and resistance - minimizes switch-node ringing, reduces EMI, and enables AOI-compatible assembly. |
| Integrated compensation network | Eliminates external Type-II/III compensation components - simplifies design, accelerates prototyping, and improves stability margin. |
Applications
| Infotainment Power Rail | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V to SoC, display controller, and audio codec in vehicle head unit under varying battery conditions (cold crank, load dump). IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise power with fast transient response and power-good sequencing. Use Value: Maintains system uptime during 4.5 V cold-crank events and rejects 36 V load-dump transients without derating or external TVS. | Use Scenario: Powers LTE/C-V2X modem, GPS receiver, and microcontroller in cellular-connected TCU requiring ultra-low quiescent current. IC Role / Device Role / Timing Role: Always-on buck converter enabling CAN wake-up functionality and maintaining RTC/sensor bias during sleep modes. Use Value: 25 µA operating IQ and 5 µA shutdown IQ extend battery backup life and support ASAM-compliant low-power states. |
| ADAS Camera Module Supply | Automotive Gateway ECU |
Use Scenario: Generates 1.8 V or 1.2 V for image sensor and ISP in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with thermal foldback and hiccup-mode short-circuit protection. Use Value: Withstands 125°C junction temperature and recovers autonomously from cable shorts without system reset or firmware intervention. | Use Scenario: Provides isolated 5 V rail for CAN FD transceivers and 3.3 V for gateway MCU in multi-bus automotive gateway with strict EMI limits. IC Role / Device Role / Timing Role: Low-EMI buck converter with symmetrical VIN/PGND layout and integrated EMI reduction features. Use Value: Meets CISPR-25 Class 5 radiated emissions without ferrite beads or shielding, reducing bill-of-materials cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630APCQRNXRQ1 | 2.1 MHz switching frequency vs. 400 kHz; identical package, current rating, and feature set. | Better suited for space-constrained designs needing smaller inductors/capacitors; higher EMI risk without careful layout. | Select when board area is limited and higher-frequency filtering is feasible; avoid if EMI testing margins are tight. |
| TPS543320RTWR | 3 A, 4.5–18 V input, 2.2 MHz, integrated FETs, but lacks AEC-Q100 qualification and automotive temp grade. | Targeted at industrial/commercial power supplies; not validated for automotive vibration, lifetime, or failure-in-time metrics. | Use only in non-automotive applications; unsuitable for production vehicles due to missing AEC-Q100 documentation and Grade 1 validation. |
Compared with LMR33630APAQRNXRQ1, the LMR33630APCQRNXRQ1 offers higher switching frequency for compact magnetics but demands stricter EMI mitigation, while the TPS543320RTWR lacks automotive qualification entirely - making the LMR33630APAQRNXRQ1 the sole qualified choice for safety-critical vehicle subsystems.
Availability
LMR33630APAQRNXRQ1 is available at Aetrix Electronics and suitable for infotainment systems, telematics control units, and ADAS camera modules requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LMR33630APAQRNXRQ1 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 experience.
The LMR336x0AP-Q1 product line delivers high-efficiency, low-EMI synchronous buck regulators specifically engineered for demanding automotive environments - emphasizing AEC-Q100 compliance, functional safety readiness, and robust thermal performance.
FAQ
What is the maximum output voltage supported by the LMR33630APAQRNXRQ1?
The LMR33630APAQRNXRQ1 supports an adjustable output voltage range from 1 V to 24 V. This is achieved via an external resistor divider on the FB pin, referenced to an internal 1.0 V ±1.5% precision bandgap. The maximum output is limited to 95% of VIN under certain conditions; for outputs above 24 V or near VIN, consult TI's application engineering team before finalizing the design.
Does the LMR33630APAQRNXRQ1 require external compensation components?
No, the LMR33630APAQRNXRQ1 integrates a complete Type-II compensation network internally. This eliminates the need for external resistors and capacitors typically required for loop stabilization, reducing solution size and simplifying design. Layout best practices still apply - especially for FB trace routing and AGND placement - to ensure stability across temperature and load.
What protection features does the LMR33630APAQRNXRQ1 include?
The LMR33630APAQRNXRQ1 includes cycle-by-cycle current limiting, hiccup-mode short-circuit protection (94 ms off-time), thermal shutdown (165°C trip), input undervoltage lockout (via VCC monitoring), and power-good flag assertion during fault conditions. These features operate independently of external circuitry and are fully tested per AEC-Q100 requirements for automotive reliability.
Can the LMR33630APAQRNXRQ1 operate with a 3.8 V input and deliver 3.3 V output?
Yes, the LMR33630APAQRNXRQ1 is specifically designed to regulate down from 3.8 V input to 3.3 V output, enabled by its 68 ns minimum on-time and peak-current-mode architecture. At this low VIN–VOUT differential, the device automatically extends duty cycle and reduces switching frequency to maintain regulation - verified across –40°C to +125°C ambient.
Is the LMR33630APAQRNXRQ1 pin-compatible with other members of the LMR336x0AP-Q1 family?
Yes, all LMR336x0AP-Q1 variants - including LMR33620AP-Q1 and LMR33630AP-Q1 in RNX package - share identical 12-pin VQFN pinout, footprint, and thermal pad layout. This enables direct substitution between 2 A and 3 A versions without PCB redesign, provided the application's current demand and thermal constraints are satisfied.
LMR33630APAQRNXRQ1 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:
- 400kHz
- 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)
LMR33630APAQRNXRQ1 FAQ
1.How can I place an order for LMR33630APAQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630APAQRNXRQ1 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 LMR33630APAQRNXRQ1 reliable?
The price and inventory of LMR33630APAQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630APAQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630APAQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630APAQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630APAQRNXRQ1?
LMR33630APAQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630APAQRNXRQ1 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 LMR33630APAQRNXRQ1?
For technical support, including LMR33630APAQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630APAQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33630APAQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630APAQRNXRQ1 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 LMR33630APAQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630APAQRNXRQ1?
All LMR33630APAQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630APAQRNXRQ1, 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 LMR33630APAQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33630APAQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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