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Texas Instruments LMR33630BRNXR
- Part No.:
- LMR33630BRNXR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630BRNXR.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,330
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Product details
Overview
LMR33630BRNXR from Texas Instruments is a synchronous step-down DC/DC converter optimized for rugged industrial power conversion. It operates from 3.8 V to 36 V input, delivers up to 3 A output current, supports adjustable output voltage (1 V–24 V), features 1.4 MHz fixed switching frequency, and integrates 75 mΩ/50 mΩ high-side/low-side MOSFETs in a 3 mm × 2 mm VQFN package with wettable flanks - enabling compact, low-EMI designs for motor drives and PLC CPU power rails.
For engineers reviewing the LMR33630BRNXR datasheet, LMR33630BRNXR pinout, LMR33630BRNXR application, or LMR33630BRNXR equivalent, key selection considerations include its 1.4 MHz operation for small external inductors, precision enable threshold (1.231 V typ), power-good flag with glitch filtering (60–170 µs), thermal shutdown at 165°C, and peak efficiency >95% at 5 V/1 A with 12 V input.
Technical Context
The LMR33630BRNXR employs peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency (>25 µA quiescent current) while delivering stable regulation across –40°C to +125°C junction temperature. Its integrated compensation network eliminates external loop components, and the 68 ns minimum on-time enables high step-down ratios (e.g., 36 V → 3.3 V at 1.4 MHz).
Designed for low EMI, it uses HotRod™ packaging with symmetrical VIN/PGND pin layout to cancel magnetic fields, parallel input current paths, and a dedicated thermal pad connected to AGND. Protection includes cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms burst interval), input UVLO, and thermal shutdown with 148°C recovery hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial rails including 24 V DC systems and automotive battery transients. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or servo driver logic sections. |
| Switching Frequency | 1.4 MHz (fixed) - enables use of ≤2.2 µH inductors and reduces solution footprint vs. 400 kHz variants. |
| RDS(on) HS/LS | 75 mΩ / 50 mΩ - lowers conduction loss and improves full-load efficiency in compact VQFN package. |
| Quiescent Current | 25 µA (typ) - extends battery life in always-on industrial sensors or backup power circuits. |
| Feedback Reference | 1.0 V ±1.5% - ensures tight output regulation accuracy across line/load/temperature for ADC reference supplies. |
| Min On-Time | 68 ns - allows direct 36 V-to-3.3 V conversion at 1.4 MHz without requiring external pre-regulation. |
| Thermal Shutdown | 165°C activation / 148°C recovery - provides robust overtemperature protection with 17°C hysteresis for reliable restart. |
Pinout & Package
The LMR33630BRNXR is housed in a 12-pin, 3.0 mm × 2.0 mm × 0.85 mm VQFN package with wettable flanks and an exposed thermal pad connected to AGND. This package minimizes parasitic inductance for low EMI and supports automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must be tied directly to PCB ground plane with low-inductance connection. |
| 2, 10 | VIN | Main input supply (3.8–36 V); requires local 10 µF ceramic capacitor to PGND for stability and transient response. |
| 9 | EN | Logic-level enable with precision thresholds (1.231 V typ turn-on); supports adjustable UVLO via external resistor divider. |
| 8 | PG | Open-drain power-good flag; asserts high after soft-start when VOUT is within ±5% of target, with 60–170 µs glitch filter. |
| 7 | FB | Feedback input referenced to 1.0 V internal reference; connects to resistor divider for adjustable output voltage configuration. |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry and can supply PG pull-up (1 µF bypass to AGND required). |
| 4 | BOOT | Bootstrap supply for high-side gate driver; requires 100 nF capacitor to SW pin for proper gate drive voltage generation. |
| 12 | SW | Switch node connecting internal MOSFETs to external inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 6 | AGND | Analog ground reference for feedback, error amplifier, and internal references; must be star-connected to PGND under thermal pad. |
| 3 | NC | No internal connection; must be left unconnected on PCB - used only to simplify CBOOT-to-SW routing in VQFN layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation | Eliminates external Type-II/III compensation components, reducing BOM count and layout sensitivity. |
| HotRod™ VQFN Package | Reduces switch-node ringing and radiated EMI by minimizing bond-wire inductance and enabling symmetric current paths. |
| PFM/PWM Auto-Transition | Maintains >85% efficiency down to 1 mA load via diode-emulation mode, critical for intermittent-sensing applications. |
| Precision Enable Threshold | 1.231 V typical turn-on with 100 mV hysteresis ensures clean startup and avoids brownout oscillation in noisy environments. |
| Hiccup-Mode Short-Circuit Protection | 94 ms off-time between current-limit bursts prevents thermal runaway during sustained output shorts. |
| Functional Safety Documentation | TI provides FIT rate data, failure mode analysis, and safety manual to support ISO 26262 or IEC 61508 system certification. |
Applications
| Motor Drive Power Supply | PLC CPU Core Supply |
|---|---|
Use Scenario: Powers digital control logic and gate drivers in compact drone ESCs and servo amplifiers where space and EMI are constrained. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V bus to 5 V/3.3 V for MCU, encoder interface, and isolated gate-driver bias rails. Use Value: 1.4 MHz operation allows <2.2 µH inductors; 68 ns min on-time supports direct 24 V→3.3 V conversion; wettable-flank VQFN enables AOI-compatible assembly. | Use Scenario: Supplies 3.3 V core voltage to ARM Cortex-M7-based PLC CPUs operating in factory automation cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with thermal shutdown and hiccup-mode protection against field wiring faults. Use Value: 125°C max junction rating and 165°C thermal shutdown ensure uptime in sealed enclosures; 25 µA IQ extends runtime during standby modes. |
| HVAC Control Board | Elevator Controller Logic Rail |
Use Scenario: Generates 5 V rail for communication interfaces (RS-485, CAN) and sensor front-ends in wall-mounted HVAC thermostats with wide input range. IC Role / Device Role / Timing Role: Wide-VIN buck converter handling 12–36 V AC/DC adapter outputs and battery backup inputs. Use Value: 3.8 V min input enables operation during brownouts; power-good flag synchronizes firmware initialization with stable 5 V rail. | Use Scenario: Provides isolated 3.3 V logic supply for elevator door control units exposed to vibration, ESD, and 36 V battery backup systems. IC Role / Device Role / Timing Role: Ruggedized DC/DC stage meeting IEC 61000-4 immunity requirements via low-EMI HotRod layout. Use Value: Symmetrical VIN/PGND pinout cancels magnetic fields; 75/50 mΩ MOSFETs minimize heat rise in confined metal enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630ARNX | Same VQFN package and 3 A rating, but fixed 400 kHz switching frequency - results in larger inductor (≥4.7 µH) and lower light-load efficiency. | Better suited for noise-sensitive audio or RF subsystems where lower-frequency switching simplifies filtering. | Select LMR33630ARNX if board space allows larger magnetics and EMI filtering is prioritized over size. |
| TPSM53603 | Pin-compatible module integrating inductor, LMR33630-level controller, and shielding - eliminates layout risk but increases height (5.8 mm) and cost. | Ideal for rapid prototyping or low-volume production where design cycle time outweighs BOM cost. | Choose TPSM53603 when schedule pressure demands functional validation before final layout spin. |
Compared with LMR33630ARNX, the LMR33630BRNXR saves ~30% board area via 1.4 MHz operation and improves light-load efficiency by 8–12% using PFM mode; versus TPSM53603, it offers 40% lower profile (0.85 mm vs. 5.8 mm) and 25% lower unit cost at volume, at the expense of layout validation effort.
Availability
LMR33630BRNXR is available at Aetrix Electronics and suitable for motor drive systems, PLC CPU power supplies, HVAC control boards, and elevator controller logic rails requiring stable component supply, long-term manufacturability, and AEC-Q100-aligned reliability.
Supply support for LMR33630BRNXR 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 ICs, with decades of expertise in high-reliability industrial and automotive power solutions.
The LMR33630BRNXR belongs to TI's SIMPLE SWITCHER® family - engineered for ease of use, ruggedness, and fast time-to-market in industrial power conversion, featuring integrated FETs, internal compensation, and robust protection schemes.
FAQ
What is the recommended input capacitor for LMR33630BRNXR in a 24-V input, 5-V/3-A output design?
For LMR33630BRNXR operating from 24 V input to 5 V/3 A output, TI recommends a minimum 22 µF X7R ceramic capacitor rated ≥35 V placed directly between VIN and PGND pins. A parallel combination of one 10 µF and one 12 µF device improves high-frequency decoupling. The LMR33630BRNXR datasheet Figure 9-19 shows optimal placement adjacent to pins 2 and 1, with short, wide traces to minimize loop inductance and prevent instability.
Does LMR33630BRNXR support adjustable soft-start time, or is it fixed?
The LMR33630BRNXR features a fixed internal soft-start time of 2.9–6 ms (typical 4 ms), as specified in Section 7.5 of the datasheet. It does not support external adjustment. This controlled ramp prevents output overshoot and limits inrush current during startup - a key requirement for powering sensitive logic in PLC CPU modules. The LMR33630BRNXR begins soft-start immediately after EN rises above 1.231 V.
Can LMR33630BRNXR be used in AEC-Q100-compliant automotive applications?
The LMR33630BRNXR itself is not AEC-Q100 qualified; however, TI offers a pin-compatible AEC-Q100 Grade 1 qualified variant (LMR33630BQRNXR) with identical electrical specs and 1.4 MHz frequency. For automotive body electronics or infotainment power rails requiring qualification, LMR33630BQRNXR must be selected instead of LMR33630BRNXR - the latter is intended for industrial use only.
What is the maximum achievable output voltage accuracy over temperature for LMR33630BRNXR?
LMR33630BRNXR guarantees output voltage regulation within ±1.5% over –40°C to +125°C junction temperature when configured for 3.3 V or 5 V output, per Section 7.7 of the datasheet. This includes line, load, and temperature effects. The 1.0 V ±1.5% internal reference (VFB) and precision enable thresholds contribute directly to this accuracy, making LMR33630BRNXR suitable for powering ADC references and real-time clock circuits.
How does the power-good (PG) flag behave during thermal shutdown on LMR33630BRNXR?
During thermal shutdown, the LMR33630BRNXR pulls the PG pin low within 10 µs, signaling fault condition to the host system. The PG flag remains low until both junction temperature falls below 148°C (recovery threshold) and output voltage stabilizes within regulation window - typically occurring 5–10 ms after thermal event ends. This behavior is documented in Section 8.3.1 and Figure 8-1 of the LMR33630BRNXR datasheet.
LMR33630BRNXR 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:
- 1.4MHz
- 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)
LMR33630BRNXR FAQ
1.How can I place an order for LMR33630BRNXR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630BRNXR 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 LMR33630BRNXR reliable?
The price and inventory of LMR33630BRNXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630BRNXR is usually 5 days.
3.What payment methods are accepted for LMR33630BRNXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630BRNXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630BRNXR?
LMR33630BRNXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630BRNXR 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 LMR33630BRNXR?
For technical support, including LMR33630BRNXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630BRNXR requirements.
6.How does Aetrix verify that LMR33630BRNXR is sourced from the original manufacturer or authorized distributors?
All LMR33630BRNXR 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 LMR33630BRNXR meets industry standards.
7.What is the process for return or replacement of LMR33630BRNXR?
All LMR33630BRNXR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630BRNXR, 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 LMR33630BRNXR part is unused and in its original packaging.
Return procedure for LMR33630BRNXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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