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Texas Instruments LMR33630BQRNXRQ1
- Part No.:
- LMR33630BQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630BQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LMR33630BQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 3 A continuous output current across 3.8 V to 36 V input, with adjustable 1 V–24 V output and fixed 1.4 MHz switching frequency. It integrates 75 mΩ/50 mΩ RDS(on) MOSFETs, peak-current-mode control, and a precision enable input for infotainment USB charging and telematics power rails.
For engineers reviewing the LMR33630BQRNXRQ1 datasheet, LMR33630BQRNXRQ1 pinout, LMR33630BQRNXRQ1 application, or LMR33630BQRNXRQ1 equivalent, key selection considerations include its 1.4 MHz fixed-frequency operation, 68 ns minimum on-time, wettable-flank VQFN package for EMI reduction, automotive thermal range (–40°C to +125°C), and integrated power-good flag with glitch filtering.
Technical Context
The LMR33630BQRNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load ranges. Its 1.4 MHz switching frequency enables compact external components while supporting >95% peak efficiency and 25 µA operating quiescent current.
It features a precision enable threshold (1.231 V typical rising, 100 mV hysteresis), integrated loop compensation, and robust protection including cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown at 165°C, and input UVLO referenced to internal VCC.
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 and load-dump conditions. |
| Output Current | 3 A continuous - sufficient for powering USB-PD ports, MCU cores, and CAN transceivers in automotive ECUs. |
| Switching Frequency | 1.4 MHz (fixed) - enables use of small 1–2.2 µH inductors and reduces EMI fundamental frequency above AM band. |
| RDS(on) (HS/LS) | 75 mΩ / 50 mΩ - minimizes conduction loss and thermal rise at full load, supporting >95% peak efficiency. |
| Min On-Time | 68 ns - allows high step-down ratios (e.g., 12 V → 1.2 V) at 1.4 MHz without pulse-skipping instability. |
| Quiescent Current | 25 µA (operating), 5 µA (shutdown) - extends battery life in always-on vehicle modules like telematics gateways. |
| Operating Temp | –40°C to +125°C (TA) - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard applications. |
Pinout & Package
The LMR33630BQRNXRQ1 is housed in a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm with wettable flanks for automated optical inspection and improved solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground and AGND via low-inductance path; bypass capacitor return node. |
| 2, 10 | VIN | Main input supply - requires direct connection to high-quality input capacitor(s); dual pins reduce parasitic inductance and EMI. |
| 3 | NC | No internal connection - used on PCB to simplify CBOOT-to-SW routing; must be tied to SW per layout guidelines. |
| 4 | BOOT | Bootstrap supply for high-side driver - connects to SW via 100 nF ceramic capacitor; critical for gate drive integrity. |
| 5 | VCC | Internal 5-V LDO output - powers control circuitry; not for external loads; requires 1 µF bypass to AGND. |
| 6 | AGND | Analog ground reference - serves as reference for FB, PG, EN; must be star-connected to PGND near IC. |
| 7 | FB | Feedback input - senses output voltage via resistor divider; 1.0 V nominal reference; must not float or short. |
| 8 | PG | Open-drain power-good flag - signals regulation status (high = OK); includes 170 µs glitch filter and 76 Ω pull-down RDS(on). |
| 9 | EN | Enable input - precision thresholds (1.231 V ON, 1.131 V OFF) allow accurate input UVLO implementation via external divider. |
| 12 | SW | Switch node - connects to power inductor; high dv/dt node requiring tight layout; ties to NC pin on PCB for CBOOT routing. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN with wettable flanks | Reduces package parasitics by >50% vs standard QFN, enabling lower EMI and higher efficiency at 1.4 MHz. |
| Integrated compensation network | Eliminates need for external Type II/III compensation components, reducing BOM count and design iteration time. |
| Auto PFM/PWM mode transition | Maintains >85% efficiency down to 1 mA load without external bias, critical for low-power sleep modes in telematics units. |
| Short-circuit hiccup protection | 94 ms off-time limits average power dissipation during sustained shorts, preventing thermal runaway in enclosed modules. |
| Parallel VIN/PGND pin layout | Symmetrical input current paths cancel magnetic fields, reducing radiated emissions by up to 10 dB compared to single-pin configurations. |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual USB-A ports (5 V @ 2.4 A total) in automotive head units with battery input ranging from 9 V (cold crank) to 16 V (charging). IC Role / Device Role / Timing Role: Primary 5 V buck regulator with precise enable sequencing and power-good signaling to USB controller IC. Use Value: 1.4 MHz operation avoids AM radio band interference; 68 ns min on-time ensures stable 5 V output even at 9 V input. | Use Scenario: Supplying 3.3 V to LTE modem, GNSS receiver, and CAN FD transceiver in connected car gateways with strict 125°C ambient requirement. IC Role / Device Role / Timing Role: Main system rail regulator with thermal shutdown (165°C) and automotive-grade reliability certification. Use Value: AEC-Q100 Grade 1 qualification and 25 µA quiescent current support always-on connectivity with <10 µA system standby draw. |
| ADAS Camera Module | Automotive Instrument Cluster |
Use Scenario: Generating 1.2 V core supply for image signal processor (ISP) in rear-view camera systems exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with fast transient response to ISP burst-mode processing demands. Use Value: Peak-current-mode control delivers <10 µs load transient recovery; 75 mΩ/50 mΩ MOSFETs minimize thermal derating at 125°C junction. | Use Scenario: Providing 5 V rail to microcontroller, TFT display backlight driver, and touch controller in digital instrument clusters with EMC-sensitive analog sensors. IC Role / Device Role / Timing Role: Low-noise, low-EMI power source with integrated PG flag for safe MCU reset during brownout events. Use Value: HotRod™ package and parallel VIN/PGND paths reduce conducted emissions below CISPR 25 Class 5 limits without added ferrites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630AQRNXRQ1 | 400 kHz switching frequency; longer 2.9–6 ms soft-start; higher RDS(on) (75/50 mΩ same, but lower frequency increases AC loss) | Better suited for noise-sensitive analog rails where lower frequency simplifies EMI filtering | Select when prioritizing lowest possible EMI over solution size; requires larger inductor and output capacitor. |
| LMR33630CQRNXRQ1 | 2.1 MHz switching frequency; shorter min on-time (68 ns same); higher switching losses at full load | Ideal for space-constrained modules needing smallest possible passive components | Select when board area is critical and thermal margin allows higher switching loss; verify thermal performance at 125°C ambient. |
Compared with LMR33630AQRNXRQ1 and LMR33630CQRNXRQ1, the LMR33630BQRNXRQ1 offers optimal balance: 1.4 MHz enables compact magnetics without excessive AC loss, maintains >95% peak efficiency, and fits common automotive EMI requirements without overspecifying board area or thermal headroom.
Availability
LMR33630BQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and ADAS applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMR33630BQRNXRQ1 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 power management technologies with deep automotive qualification expertise.
The LMR33630-Q1 product line delivers high-efficiency, AEC-Q100-qualified buck converters optimized for rugged automotive environments - designed specifically for infotainment, telematics, and ADAS subsystems demanding reliability, low EMI, and extended temperature operation.
FAQ
What is the switching frequency of the LMR33630BQRNXRQ1?
The LMR33630BQRNXRQ1 operates at a fixed 1.4 MHz switching frequency. This value is factory-configured and cannot be adjusted externally. The 1.4 MHz frequency enables compact external components while maintaining high efficiency and staying above the AM radio band to reduce EMI concerns in automotive applications. It is distinct from the 400 kHz (A-version) and 2.1 MHz (C-version) variants in the same family.
Does the LMR33630BQRNXRQ1 support adjustable output voltage?
Yes, the LMR33630BQRNXRQ1 supports fully adjustable output voltage from 1 V to 24 V using an external resistor divider on the FB pin. Its internal 1.0 V feedback reference provides ±1.5% regulation accuracy over temperature and line/load conditions. The device does not offer fixed-output variants - all versions, including LMR33630BQRNXRQ1, require external resistors to set VOUT.
What protection features are integrated into the LMR33630BQRNXRQ1?
The LMR33630BQRNXRQ1 integrates cycle-by-cycle current limit, hiccup-mode short-circuit protection (94 ms off-time), thermal shutdown (165°C trip, 148°C recovery), input undervoltage lockout (via VCC LDO), and precision enable-based startup control. It also includes a zero-current detector for diode emulation in light-load PFM mode and a 170 µs glitch-filtered open-drain power-good flag for system monitoring.
Is the LMR33630BQRNXRQ1 pin-compatible with other variants in the LMR33630-Q1 family?
Yes, the LMR33630BQRNXRQ1 is pin-compatible with LMR33630AQRNXRQ1 and LMR33630CQRNXRQ1 - all use the identical 12-pin VQFN (RNX) package with 3.00 mm × 2.00 mm footprint and wettable flanks. No PCB layout changes are required when migrating between A/B/C frequency variants; only the external inductor and compensation may need minor optimization based on frequency-specific stability requirements.
What is the purpose of the NC pin (Pin 3) on the LMR33630BQRNXRQ1?
Pin 3 on the LMR33630BQRNXRQ1 is a no-connect (NC) terminal with no internal silicon connection. Its sole function is mechanical: it provides a dedicated PCB pad adjacent to the SW pin to simplify routing of the CBOOT capacitor from BOOT to SW. TI's layout guidelines require connecting this NC pad to the SW net on the PCB - it is not left floating and serves as a convenient routing node, not a functional signal.
LMR33630BQRNXRQ1 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:
- 1.4MHz
- 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)
LMR33630BQRNXRQ1 FAQ
1.How can I place an order for LMR33630BQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630BQRNXRQ1 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 LMR33630BQRNXRQ1 reliable?
The price and inventory of LMR33630BQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630BQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630BQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630BQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630BQRNXRQ1?
LMR33630BQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630BQRNXRQ1 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 LMR33630BQRNXRQ1?
For technical support, including LMR33630BQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630BQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33630BQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630BQRNXRQ1 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 LMR33630BQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630BQRNXRQ1?
All LMR33630BQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630BQRNXRQ1, 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 LMR33630BQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33630BQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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