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Texas Instruments LMR33630ADDAR
- Part No.:
- LMR33630ADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33630ADDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,630
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Product details
Overview
LMR33630ADDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering up to 3 A output current across an input voltage range of 3.8 V to 36 V, with adjustable output (1 V–24 V), peak efficiency >95%, and 400 kHz fixed switching frequency. It integrates high- and low-side MOSFETs (75 mΩ/50 mΩ RDS(on) in VQFN), operates from –40°C to +125°C, and targets rugged industrial power rails for PLC CPU and motor drive subsystems.
For engineers reviewing the LMR33630ADDAR datasheet, LMR33630ADDAR pinout, LMR33630ADDAR application, or LMR33630ADDAR equivalent, key selection criteria include its 400 kHz switching frequency variant, VQFN-12 (3 mm × 2 mm) package with wettable flanks, precision enable threshold (1.231 V typ), power-good flag timing (60–170 µs glitch filter), and thermal shutdown at 165°C.
Technical Context
The LMR33630ADDAR uses peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency (>25 µA quiescent current) while supporting heavy loads up to 3 A. Its integrated compensation network eliminates external loop components, and short minimum on-time (68 ns in VQFN) enables high VIN-to-VOUT step-down ratios - e.g., regulating 3.3 V from 3.8 V input.
It features dual protection architecture: cycle-by-cycle current limiting (high-side limit 4.5 A typ) plus hiccup-mode short-circuit response (94 ms burst interval), alongside thermal shutdown (165°C trip, 148°C recovery) and input UVLO. The VQFN package's symmetrical VIN/PGND layout reduces EMI via magnetic field cancellation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial supplies including 12 V, 24 V, and 36 V battery or rail systems. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or servo gate drivers. |
| Switching Frequency | 400 kHz - balances efficiency, inductor size, and EMI; avoids AM radio band while enabling compact magnetics. |
| Efficiency (Typ) | >95% at mid-load - minimizes thermal stress and enables convection-cooled designs in enclosed enclosures. |
| Quiescent Current | 25 µA - extends standby runtime in always-on industrial sensors or remote monitoring nodes. |
| Junction Temp Range | –40°C to +125°C - qualified for under-hood automotive-adjacent environments and factory-floor control cabinets. |
| Feedback Reference | 1.000 V ±15 mV - enables precise output regulation with <±1.5% total error over line/load/temp. |
Pinout & Package
The LMR33630ADDAR is packaged in a 12-pin VQFN (3.00 mm × 2.00 mm, 0.85 mm height) with wettable flanks and exposed thermal pad (AGND). This RoHS-compliant package supports automated optical inspection (AOI) and delivers superior thermal resistance (RθJB = 23.3°C/W) versus HSOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,11 PGND | Power ground | Main return path for high-current switch node; must be connected to PCB ground plane with low-inductance copper pour. |
| 2,10 VIN | Input supply | Primary DC input (3.8–36 V); requires local 10–22 µF ceramic capacitor directly to PGND. |
| 9 EN | Enable control | Logic-level input with precision thresholds (1.231 V turn-on); connects to MCU GPIO or resistor divider for programmable UVLO. |
| 8 PG | Power-good flag | Open-drain output signaling valid regulation (105–110% / 90–95% FB window); requires external pull-up to VCC or VOUT. |
| 7 FB | Feedback input | Resistor-divider tap point referencing 1.000 V internal reference; determines output voltage (VOUT = 1.000 × (1 + RFBT/RFBB)). |
| 5 VCC | Internal LDO output | 5 V ±250 mV regulated supply for internal circuitry; decoupled with 1 µF ceramic to AGND. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100 nF ceramic capacitor between BOOT and SW pins. |
| 12 SW | Switch node | Connection to power inductor; carries high di/dt; must use short, wide copper trace to minimize ringing and EMI. |
| 6 AGND | Analog ground | Reference for feedback, enable, and power-good circuits; tied to system ground but isolated from noisy PGND at single-point star. |
| 3 NC | No connect | Unused pin on VQFN; must be left unconnected per datasheet - not tied to ground or voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 75 mΩ high-side / 50 mΩ low-side RDS(on) in VQFN - eliminates external FETs and driver, reducing BOM count and layout complexity. |
| Peak-current-mode control | Enables fast transient response and stable operation with ceramic output capacitors without external compensation. |
| Power-good flag with glitch filter | 60–170 µs programmable delay prevents false resets during load transients - critical for reliable MCU boot sequencing. |
| Thermal and fault protection | Includes hiccup-mode short-circuit response, cycle-by-cycle current limit, and thermal shutdown with hysteresis (165°C/148°C) - ensures robust field operation. |
| Low EMI HotRod™ layout | Symmetrical VIN/PGND pins and minimized loop area reduce radiated emissions - simplifies EMC compliance testing in industrial environments. |
Applications
| PLC CPU Power Supply | Motor Drive Bias Rail |
|---|---|
Use Scenario: Providing clean, regulated 3.3 V or 5 V to programmable logic controller main CPU and communication peripherals in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage with tight regulation (<±1.5%) and fast load-step response. Use Value: Enables reliable operation across wide ambient temperature (–40°C to +125°C) and input voltage variation (12–36 V DC bus), reducing need for derating. | Use Scenario: Generating isolated gate-driver bias voltages (e.g., 12 V, 15 V) for IGBT or MOSFET half-bridges in drone ESCs or AC inverters. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converter feeding isolated DC/DC modules or level-shifted gate drivers. Use Value: Delivers 3 A at >95% efficiency with minimal thermal rise, allowing compact heatsink-free designs in space-constrained motor controllers. |
| HVAC Control Unit | Elevator Safety Logic Power |
Use Scenario: Powering microcontrollers, sensors, and CAN transceivers in building HVAC control panels operating from 24 V DC distribution rails. IC Role / Device Role / Timing Role: Main system regulator with precision enable and power-good signaling for controlled startup and brownout detection. Use Value: Precision enable threshold (1.231 V) allows accurate input UVLO configuration; PG flag synchronizes firmware initialization with stable VOUT. | Use Scenario: Supplying fail-safe 5 V power to elevator door interlock logic and emergency stop monitoring circuits requiring functional safety compliance. IC Role / Device Role / Timing Role: Functional safety-capable DC/DC converter with documented failure modes and diagnostic coverage support. Use Value: Meets requirements for SIL-2 capable subsystems when used with external watchdog and redundancy - validated by TI functional safety documentation. |
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 | Same HSOIC-8 package but 1.4 MHz switching frequency; higher RDS(on) (95/66 mΩ); no wettable flanks. | Better suited for space-constrained layouts where higher frequency enables smaller inductors, but less optimal for ultra-low EMI or thermal performance. | Select LMR33630BDDA only if board area is critical and 1.4 MHz operation aligns with system noise budget. |
| TPSM53603 | Complete 3-A module with integrated inductor; larger footprint (7.5 mm × 6.5 mm); fixed 3.3 V or 5 V outputs; no adjustable FB. | Reduces design time and validation effort for non-adjustable outputs; eliminates magnetics selection and layout risk. | Choose TPSM53603 when time-to-market outweighs bill-of-material cost and flexibility; not suitable for custom VOUT or footprint-sensitive designs. |
Compared with LMR33630BDDA, the LMR33630ADDAR offers lower EMI and better thermal performance due to its VQFN package and optimized pinout; compared with TPSM53603, it provides full output adjustability and smaller PCB footprint at the cost of external component design responsibility.
Availability
LMR33630ADDAR is available at Aetrix Electronics and suitable for PLC CPU power supplies, motor drive bias rails, HVAC control units, and elevator safety logic requiring stable component supply, long-term industrial lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LMR33630ADDAR 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 industrial-grade product development and manufacturing excellence.
The LMR33630ADDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically for rugged industrial applications demanding wide input range, high reliability, and minimal external components.
FAQ
What is the switching frequency of the LMR33630ADDAR?
The LMR33630ADDAR operates at a fixed 400 kHz switching frequency. This value is factory-trimmed and cannot be adjusted externally. It balances efficiency, magnetic component size, and EMI performance - avoiding the AM radio band while enabling compact 2.2 µH inductors. Frequency tolerance is ±15% (340–460 kHz) over temperature and input voltage.
Does the LMR33630ADDAR require external compensation components?
No, the LMR33630ADDAR includes an integrated compensation network. This eliminates the need for external Type-II or Type-III compensation networks, reducing component count and layout sensitivity. The internal compensation is optimized for stability with standard ceramic output capacitors (e.g., 22–47 µF X5R/X7R) and typical inductor values (2.2–4.7 µH).
What package type is used for the LMR33630ADDAR?
The LMR33630ADDAR uses a 12-pin VQFN package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks. This package features an exposed thermal pad (AGND) and symmetrical VIN/PGND pin placement to minimize EMI. It is distinct from the HSOIC-8 variant and requires reflow-compatible stencil design for reliable solder joint formation.
Can the LMR33630ADDAR operate with an input voltage as low as 3.8 V?
Yes, the LMR33630ADDAR supports a minimum input voltage of 3.8 V, enabling regulation of 3.3 V outputs even in dropout conditions. Its short minimum on-time (68 ns in VQFN) and adaptive frequency foldback allow stable operation down to VIN ≈ VOUT + dropout voltage (~150 mV at 1 A), making it suitable for single-cell LiFePO₄ or low-voltage industrial rails.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR33630ADDAR PG pin is an open-drain output that asserts high after soft-start completes (~4 ms delay from EN assertion) when output voltage is within 90–95% (low threshold) and 105–110% (high threshold) of the target. It pulls low during startup, thermal shutdown, current limit, or output undervoltage/overvoltage. A built-in 60–170 µs glitch filter rejects transient excursions.
LMR33630ADDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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
- Supplier Device Package:
- 8-SO PowerPad
LMR33630ADDAR FAQ
1.How can I place an order for LMR33630ADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630ADDAR 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 LMR33630ADDAR reliable?
The price and inventory of LMR33630ADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630ADDAR is usually 5 days.
3.What payment methods are accepted for LMR33630ADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630ADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630ADDAR?
LMR33630ADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630ADDAR 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 LMR33630ADDAR?
For technical support, including LMR33630ADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630ADDAR requirements.
6.How does Aetrix verify that LMR33630ADDAR is sourced from the original manufacturer or authorized distributors?
All LMR33630ADDAR 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 LMR33630ADDAR meets industry standards.
7.What is the process for return or replacement of LMR33630ADDAR?
All LMR33630ADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630ADDAR, 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 LMR33630ADDAR part is unused and in its original packaging.
Return procedure for LMR33630ADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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