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Texas Instruments LMR33630ARNXT
- Part No.:
- LMR33630ARNXT
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630ARNXT.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:638
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Product details
Overview
LMR33630ARNXT from Texas Instruments is a synchronous step-down DC/DC converter optimized for rugged industrial power conversion, delivering up to 3 A output current across an input range of 3.8 V to 36 V, with adjustable output voltage from 1 V to 24 V, peak efficiency >95%, and 400 kHz switching frequency - deployed in motor drive systems, PLC CPU supplies, and HVAC control units.
For engineers reviewing the LMR33630ARNXT datasheet, LMR33630ARNXT pinout, LMR33630ARNXT application, or LMR33630ARNXT equivalent, key selection considerations include its 12-pin VQFN (3 mm × 2 mm) package with wettable flanks, integrated compensation, precision enable threshold (1.231 V typ), power-good flag with glitch filtering (60–170 µs), and thermal shutdown at 165°C.
Technical Context
The LMR33630ARNXT implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency, supported by internal loop compensation and a 1.0 V reference (±1.5% over temperature). Its architecture enables regulation down to 3.8 V input while generating 3.3 V output at 2.1 MHz - enabled by short minimum on-time (68 ns) and low RDS-ON MOSFETs (75 mΩ HS / 50 mΩ LS).
It integrates protection features including cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms burst interval), thermal shutdown (165°C trip / 148°C recovery), input undervoltage lockout, and soft-start (2.9–6 ms). The VQFN package's symmetrical VIN/PGND layout reduces EMI via magnetic field cancellation, and HotRod™ construction minimizes parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial rails including 12 V, 24 V, and 36 V battery/supply inputs without external pre-regulation. |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, FPGAs, sensors, and gate drivers in compact industrial modules. |
| Switching Frequency | 400 kHz - fixed-frequency PWM operation ensures predictable EMI profile and simplifies filter design vs. variable-frequency alternatives. |
| Efficiency (Typ.) | >95% at 5 V/2 A, 12 V input - minimizes thermal load and enables high-density PCB layouts without forced air cooling. |
| Quiescent Current | 25 µA - enables always-on subsystems (e.g., real-time clocks, wake-up logic) to operate for years on backup batteries. |
| Feedback Reference | 1.0 V ±1.5% - provides stable output regulation across –40°C to +125°C junction temperature range. |
| Thermal Shutdown | 165°C trip / 148°C recovery - protects against sustained overload or poor heatsinking while allowing graceful recovery without manual reset. |
Pinout & Package
The LMR33630ARNXT is housed in a 12-pin VQFN package (3.00 mm × 2.00 mm × 0.85 mm) with wettable flanks and exposed thermal pad (AGND), optimized for low EMI, high thermal performance, and automated optical inspection (AOI) compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground plane and AGND with low-inductance copper; serves as primary return path for high di/dt switch currents. |
| 2, 10 | VIN | Main input supply - requires local 10–22 µF ceramic capacitor directly between VIN and PGND to suppress high-frequency ripple and transients. |
| 9 | EN | Enable input - precision threshold (1.231 V typ) allows accurate input UVLO implementation using external resistor divider; must not float. |
| 8 | PG | Open-drain power-good flag - signals valid output regulation (high) or fault (low); includes 60–170 µs glitch filter to ignore transient excursions. |
| 7 | FB | Feedback input - connects to resistor divider tap; 1.0 V reference enables precise output voltage setting (VOUT = 1.0 × (1 + RFBT/RFBB)). |
| 5 | VCC | Internal 5-V LDO output - powers internal control circuitry; requires 1-µF ceramic bypass capacitor to AGND; not for external loading. |
| 4 | BOOT | Bootstrap supply - connects via 100-nF capacitor to SW; enables high-side MOSFET gate drive; SW pin routed to NC on PCB per TI layout guidance. |
| 12 | SW | Switch node - connects directly to power inductor; high dv/dt node requiring minimal trace area and separation from sensitive analog traces. |
| 6 | AGND | Analog ground - reference for FB, EN, PG, and internal references; must be tied to system ground and thermally connected to exposed pad. |
| 3 | NC | No connect - internal disconnect; must be left unconnected on PCB; used only for mechanical symmetry in VQFN layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates need for external Type II/III compensation components, reducing BOM count and layout sensitivity while accelerating design cycle. |
| HotRod™ VQFN Package | Reduces parasitic inductance by >50% vs. standard QFN, suppressing switch-node ringing and lowering radiated EMI without added shielding or snubbers. |
| Peak-Current-Mode Control | Provides inherent cycle-by-cycle current limiting, fast transient response (<10 µs load step), and stable operation across wide input/output ratios. |
| Power-Good Flag with Glitch Filter | Enables reliable system-level sequencing and fault detection - 60–170 µs filter prevents false resets during line/load transients. |
| Low Quiescent Current (25 µA) | Supports energy-sensitive applications such as battery-backed industrial controllers and always-on sensor nodes without compromising startup time. |
Applications
| Motor Drive Power Supply | PLC CPU Core Supply |
|---|---|
Use Scenario: Powers FPGA, MCU, and gate drivers in compact drone ESCs and servo drives operating from 12–24 V battery inputs. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 3.3 V or 5 V rail with fast transient response to handle pulsed motor current demands. Use Value: 3 A capability and 68 ns minimum on-time allow direct 12 V-to-3.3 V conversion at 400 kHz, eliminating intermediate stages and saving board space. | Use Scenario: Supplies 1.2 V core and 3.3 V I/O rails for PLC CPU modules in factory automation cabinets with 24 V backplane input. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with precision enable for controlled power-up sequencing and watchdog-triggered reset via PG flag. Use Value: Integrated compensation and thermal shutdown ensure robust operation in convection-cooled enclosures with ambient temperatures up to +70°C. |
| HVAC Control Unit | Elevator Safety Logic Supply |
Use Scenario: Delivers isolated 5 V and 12 V rails for environmental sensors, display drivers, and communication interfaces in building management systems. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both 24 V AC/DC and 36 V PoE++ auxiliary inputs with consistent regulation and low EMI. Use Value: Low EMI design (symmetrical VIN/PGND layout + HotRod™) meets CISPR-32 Class B emissions limits without added ferrites or shields. | Use Scenario: Powers fail-safe monitoring circuits and redundant microcontrollers in elevator control panels requiring functional safety compliance. IC Role / Device Role / Timing Role: Functional safety-capable DC/DC with documented failure modes, thermal protection, and power-good signaling for ASIL-B system integration. Use Value: 125°C max junction rating and AEC-Q100-qualified variant availability support long-term reliability in safety-critical vertical transport applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630BDDA | 8-pin HSOIC package (5 mm × 4 mm); higher RDS-ON (95/66 mΩ); 1.4 MHz switching frequency; no wettable flanks. | Better suited for cost-sensitive, lower-density designs where thermal performance is less critical and PCB area is available. | Select when board space permits larger package and 1.4 MHz operation improves filter size vs. 400 kHz. |
| TPSM53603 | Complete 3-A module with integrated inductor; larger footprint (7.5 mm × 6.5 mm); higher quiescent current (40 µA); fixed 3.3 V or 5 V outputs. | Targeted at rapid prototyping and time-to-market-critical projects where layout complexity must be minimized. | Choose when design schedule constraints outweigh BOM cost and solution size requirements. |
Compared with LMR33630BDDA, the LMR33630ARNXT offers superior thermal performance and EMI reduction in a smaller footprint, while TPSM53603 trades off design flexibility and efficiency for faster implementation - making LMR33630ARNXT optimal for space-constrained, thermally demanding industrial applications requiring adjustable output and maximum efficiency.
Availability
LMR33630ARNXT is available at Aetrix Electronics and suitable for motor drive systems, PLC CPU power supplies, and HVAC control units requiring stable component supply, long-lifecycle assurance, and full traceability for industrial OEM programs.
Supply support for LMR33630ARNXT 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 decades of experience in industrial-grade power solutions.
The LMR33630ARNXT belongs to TI's SIMPLE SWITCHER® family - engineered specifically for rugged, wide-input industrial DC/DC conversion where reliability, efficiency, and ease of use are critical in harsh environments.
FAQ
What is the recommended input capacitor configuration for LMR33630ARNXT?
TI recommends placing a 10–22 µF X5R/X7R ceramic capacitor directly between VIN and PGND, with additional 100 nF and 10 nF capacitors in parallel if high-frequency noise suppression is required. All capacitors must be placed within 3 mm of the LMR33630ARNXT pins using short, wide traces to minimize loop inductance - critical for stable operation and EMI control in the 3.8–36 V input range.
Does LMR33630ARNXT support adjustable output voltage, and what is the feedback reference accuracy?
Yes, LMR33630ARNXT supports fully adjustable output voltage from 1 V to 24 V using an external resistor divider on the FB pin. Its internal reference is 1.0 V with ±1.5% tolerance over –40°C to +125°C junction temperature, enabling precise output regulation even under extreme thermal conditions encountered in industrial enclosures.
How does the power-good (PG) flag behave during startup and fault conditions for LMR33630ARNXT?
The LMR33630ARNXT PG flag remains low for ~4 ms after EN assertion, then transitions high when output reaches 95% of target. It pulls low during faults (overcurrent, thermal shutdown, UVLO) and during normal startup. A built-in 60–170 µs glitch filter prevents false triggering from transient load steps - ensuring robust reset signaling for connected microcontrollers in real-world industrial environments.
What thermal management considerations apply to LMR33630ARNXT in its VQFN package?
The LMR33630ARNXT VQFN package requires soldering the exposed thermal pad (AGND) to a minimum 100 mm² copper pour connected to internal/external ground planes. TI specifies RθJB = 23.3°C/W - meaning at 3 A load and 25°C ambient, junction temperature rise is ~70°C. For continuous 3 A operation above 60°C ambient, forced airflow or thermal vias under the pad are strongly recommended to maintain <125°C junction temperature.
Can LMR33630ARNXT be used in functional safety–compliant systems, and what documentation is available?
Yes, LMR33630ARNXT is functional safety-capable, with TI providing documentation including FIT rate data, failure mode analysis, and safety application notes to support ISO 26262 ASIL-B and IEC 61508 SIL-2 system development. While the base LMR33630ARNXT is not AEC-Q100 qualified, an AEC-Q100-qualified variant exists - enabling use in safety-critical automotive and industrial applications when properly integrated per TI's safety manual.
LMR33630ARNXT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33630ARNXT FAQ
1.How can I place an order for LMR33630ARNXT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630ARNXT 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 LMR33630ARNXT reliable?
The price and inventory of LMR33630ARNXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630ARNXT is usually 5 days.
3.What payment methods are accepted for LMR33630ARNXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630ARNXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630ARNXT?
LMR33630ARNXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630ARNXT 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 LMR33630ARNXT?
For technical support, including LMR33630ARNXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630ARNXT requirements.
6.How does Aetrix verify that LMR33630ARNXT is sourced from the original manufacturer or authorized distributors?
All LMR33630ARNXT 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 LMR33630ARNXT meets industry standards.
7.What is the process for return or replacement of LMR33630ARNXT?
All LMR33630ARNXT units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630ARNXT, 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 LMR33630ARNXT part is unused and in its original packaging.
Return procedure for LMR33630ARNXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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