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Texas Instruments LMR33630APCQRNXRQ1
- Part No.:
- LMR33630APCQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630APCQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,726
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Product details
Overview
LMR33630APCQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3 A output current, operating from 3.8 V to 36 V input, with adjustable 1 V–24 V output, 2.1 MHz switching frequency, and integrated 75-mΩ/50-mΩ MOSFETs-designed for infotainment power rails in harsh-temperature vehicle environments.
For engineers reviewing the LMR33630APCQRNXRQ1 datasheet, LMR33630APCQRNXRQ1 pinout, LMR33630APCQRNXRQ1 application, or LMR33630APCQRNXRQ1 equivalent, key selection criteria include its 2.1 MHz high-frequency operation enabling compact filter design, precision enable threshold (1.231 V typ), power-good flag with glitch filtering, thermal shutdown at 165°C, and wettable-flank 3 mm × 2 mm VQFN package optimized for automotive EMI compliance.
Technical Context
This device implements peak-current-mode control with automatic PFM/PWM mode transition to maintain >95% peak efficiency across load range. Its 68 ns minimum on-time supports high VIN-to-VOUT step-down ratios (e.g., 36 V → 3.3 V at 2.1 MHz), while integrated compensation eliminates external loop components.
The architecture features dual current-limit protection (peak ISC = 4.5 A typ, valley ILIMIT = 3.5 A typ), hiccup-mode short-circuit response (94 ms off-time), and precision power-good flag with ±2% voltage thresholds referenced to FB (1.0 V nominal). Thermal management relies on RθJB = 23.3°C/W and wettable-flank VQFN for enhanced PCB heat spreading.
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 - sufficient for powering SoCs, displays, and connectivity modules in telematics units |
| Switching Frequency | 2.1 MHz - enables use of small 1 µH inductors and low-ESR ceramic capacitors for space-constrained layouts |
| Feedback Reference | 1.0 V ±1.5% - enables precise output regulation with standard resistor-divider networks |
| Quiescent Current | 25 µA typical - extends battery life during vehicle sleep modes without compromising wake-up responsiveness |
| Shutdown Current | 5 µA maximum - meets stringent automotive low-power requirements for always-on domains |
| Min On-Time | 68 ns - allows direct 36 V-to-3.3 V conversion at 2.1 MHz without requiring pre-regulation stages |
Pinout & Package
LMR33630APCQRNXRQ1 uses a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection and improved solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Low-inductance return path for high di/dt switch currents; must connect directly to AGND and input capacitor ground plane |
| 2, 10 VIN | Main input supply | Accepts 3.8–36 V; requires local 10-µF ceramic bypass capacitor placed adjacent to pins 2 and 10 |
| 3 NC | No-connect | Internally unconnected; used on PCB to route CBOOT capacitor to SW node with minimal loop area |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor connected between BOOT and SW |
| 5 VCC | Internal 5-V LDO output | Powers internal circuitry; not for external loads; requires 1-µF decoupling to AGND |
| 6 AGND | Analog ground reference | Reference for FB, EN, PG; must be tied to PGND at single point near IC |
| 7 FB | Feedback input | Monitors output via resistor divider; 1.0 V reference enables accurate adjustable output setting |
| 8 PG | Open-drain power-good flag | Asserts high when VOUT is within ±7% of target; includes 170 µs glitch filter to reject transient disturbances |
| 9 EN | Enable control | Logic-level input with 1.231 V rising threshold; supports precision UVLO using external resistor divider |
| 12 SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and guard ring to minimize EMI |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - suitable for under-hood and dashboard-mounted electronics |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and diagnostic coverage guidance - accelerates ISO 26262 ASIL-B system integration |
| HotRod™ package with wettable flanks | Reduces parasitic inductance by >50% vs. standard QFN - suppresses switch-node ringing and lowers radiated EMI by 10 dB |
| Integrated compensation network | Eliminates need for external Type-II or Type-III compensation components - reduces BOM count and layout complexity |
| Auto PFM/PWM mode transition | Maintains >85% efficiency at 1 mA load while delivering >95% peak efficiency at full 3 A - optimizes light-load battery runtime and heavy-load thermal performance |
Applications
| Infotainment Power Supply | Telematics Control Unit |
|---|---|
Use Scenario: Powers display processor, audio codec, and touch controller in center-stack head unit exposed to cabin temperature extremes. IC Role / Device Role / Timing Role: Primary 3.3-V/2.5-V buck regulator delivering stable rail with fast transient response to burst-mode video processing loads. Use Value: 2.1 MHz switching enables <10 mm² total solution size; power-good flag synchronizes SoC reset sequencing during ignition cycles. | Use Scenario: Supplies 5-V and 1.8-V rails to cellular modem, GNSS receiver, and CAN interface in rear-view mirror-mounted telematics module. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator converting 12-V battery to clean 5-V bus for downstream LDOs and PMICs. Use Value: 36-V max input withstands load-dump events; 25-µA quiescent current prevents battery drain during 10-day parking mode. |
| ADAS Camera Module | Body Control Module |
Use Scenario: Provides regulated 1.2-V core voltage for image signal processor in front-facing driver-assistance camera. IC Role / Device Role / Timing Role: Compact, high-PIN-count buck converter supporting dynamic voltage scaling during varying scene illumination conditions. Use Value: 68-ns min on-time allows direct 12-V-to-1.2-V conversion at 2.1 MHz - avoids cascaded regulation and associated losses. | Use Scenario: Generates 3.3-V logic supply for microcontroller and sensor interface in door module with extended temperature exposure. IC Role / Device Role / Timing Role: Robust primary regulator handling wide-input transients while maintaining functional safety monitoring via PG and thermal shutdown. Use Value: Hiccup-mode short-circuit protection limits fault energy during wire-chafing events; AEC-Q100 qualification ensures 15-year field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630APAQRNXRQ1 | Same 3-A rating and package, but 400 kHz switching frequency - higher inductor size, lower EMI, reduced light-load efficiency | Better suited for noise-sensitive analog subsystems where 2.1 MHz switching could interfere with RF receivers | Select when EMI filtering priority outweighs board space constraints and light-load efficiency targets |
| TPS543320RTWR | 3-A, 2.2-MHz buck with PMBus interface, higher IQ (35 µA), no integrated compensation, larger 16-pin VQFN | Supports digital telemetry and dynamic voltage scaling - required for adaptive power management in advanced ECUs | Choose when system-level telemetry, programmable soft-start, or margining capability is mandatory |
Compared with LMR33630APAQRNXRQ1, the LMR33630APCQRNXRQ1 trades lower EMI for smaller magnetics and higher light-load efficiency; versus TPS543320RTWR, it offers simpler analog control and lower BOM cost but lacks digital configurability and telemetry.
Availability
LMR33630APCQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and ADAS camera modules requiring stable component supply with AEC-Q100 compliance and long-term production continuity.
Supply support for LMR33630APCQRNXRQ1 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 solutions with over 40 years of automotive qualification experience.
The LMR336x0AP-Q1 product line delivers high-efficiency, small-solution-size DC/DC converters engineered specifically for automotive infotainment, body electronics, and ADAS subsystems operating across extended temperature and voltage ranges.
FAQ
What is the maximum input voltage rating for the LMR33630APCQRNXRQ1?
The LMR33630APCQRNXRQ1 has an absolute maximum input voltage rating of 38 V, with recommended operating range from 3.8 V to 36 V. This 36-V upper limit accommodates automotive load-dump transients per ISO 7637-2 Pulse 5a, ensuring reliable operation without external clamping in most vehicle electrical architectures. The device maintains regulation down to 3.8 V, supporting cold-crank scenarios.
Does the LMR33630APCQRNXRQ1 require external compensation components?
No, the LMR33630APCQRNXRQ1 integrates a complete Type-II compensation network internally. This eliminates the need for external resistors and capacitors typically required to stabilize voltage-mode or current-mode buck regulators. Designers can achieve stable operation with only the essential power-stage components: input/output capacitors, power inductor, and feedback divider - reducing BOM count and layout sensitivity.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33630APCQRNXRQ1?
The LMR33630APCQRNXRQ1 PG pin asserts high after a ~4-ms delay following EN assertion, indicating valid output regulation. It pulls low during undervoltage (VOUT < 92% of target), overvoltage (VOUT > 107%), thermal shutdown, or current-limit hiccup events. A built-in 170-µs glitch filter rejects sub-millisecond transients. When EN is low, PG is forced low regardless of output state, providing deterministic system reset behavior.
What thermal protection mechanisms are implemented in the LMR33630APCQRNXRQ1?
The LMR33630APCQRNXRQ1 incorporates junction-temperature sensing with thermal shutdown activation at 165°C and automatic recovery at 148°C. It also features cycle-by-cycle current limiting and hiccup-mode short-circuit protection that limits average power dissipation during sustained faults. The 3 mm × 2 mm VQFN package with wettable flanks and low RθJB (23.3°C/W) enhances heat transfer to the PCB, enabling 3-A operation without forced airflow in typical automotive ambient conditions.
Can the LMR33630APCQRNXRQ1 operate efficiently at very light loads typical in automotive standby modes?
Yes, the LMR33630APCQRNXRQ1 automatically transitions from PWM to PFM (pulse-frequency modulation) mode below ~200 mA load, reducing switching losses and achieving 25 µA typical operating quiescent current. This enables >85% efficiency at 1 mA output, critical for maintaining battery health during multi-day vehicle parking modes while preserving fast wake-up capability through the precision enable input.
LMR33630APCQRNXRQ1 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33630APCQRNXRQ1 FAQ
1.How can I place an order for LMR33630APCQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630APCQRNXRQ1 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 LMR33630APCQRNXRQ1 reliable?
The price and inventory of LMR33630APCQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630APCQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630APCQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630APCQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630APCQRNXRQ1?
LMR33630APCQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630APCQRNXRQ1 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 LMR33630APCQRNXRQ1?
For technical support, including LMR33630APCQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630APCQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33630APCQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630APCQRNXRQ1 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 LMR33630APCQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630APCQRNXRQ1?
All LMR33630APCQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630APCQRNXRQ1, 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 LMR33630APCQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33630APCQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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