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Texas Instruments LMR33630BDDAR
- Part No.:
- LMR33630BDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33630BDDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
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Product details
Overview
LMR33630BDDAR 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 (1 V–24 V), fixed 1.4 MHz switching frequency, and peak efficiency exceeding 95%. It serves as the primary voltage regulator in motor drive inverters and PLC CPU power rails.
For engineers reviewing the LMR33630BDDAR datasheet, LMR33630BDDAR pinout, LMR33630BDDAR application, or LMR33630BDDAR equivalent, key selection criteria include its 1.4 MHz fixed-frequency operation, 75 mΩ/50 mΩ internal high-side/low-side MOSFET RDS(on), –40°C to +125°C junction temperature rating, integrated compensation, and precision enable/power-good interface for system-level sequencing and fault monitoring.
Technical Context
The LMR33630BDDAR implements peak-current-mode control with automatic PFM-to-PWM transition at light loads, enabling high efficiency across full load range. Its architecture supports ultra-low dropout operation (e.g., 3.8 V input → 3.3 V output) via short minimum on-time (75 ns for HSOIC package) and adaptive frequency foldback.
It integrates dual power MOSFETs (75 mΩ HS / 50 mΩ LS), internal 5-V VCC LDO, bootstrap gate driver, and analog ground (AGND) separation for stable feedback reference. Protection includes cycle-by-cycle current limit, hiccup-mode short-circuit response, thermal shutdown (165°C), and input UVLO - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial bus rails including 12 V, 24 V, and 36 V systems without pre-regulation. |
| Output Current | 3 A continuous - sufficient to power FPGA I/O banks, microcontroller cores, or servo driver logic sections. |
| Switching Frequency | 1.4 MHz (fixed) - enables compact magnetics and low-profile 2.2 µH inductors; avoids AM radio band interference. |
| Efficiency (Typ.) | >95% at mid-load - minimizes thermal dissipation in enclosed enclosures and extends battery runtime in portable industrial tools. |
| Quiescent Current | 25 µA - maintains regulation during standby without compromising system-level low-power modes. |
| Feedback Reference | 1.0 V ±1.5% - provides precise output voltage accuracy over temperature and line/load variations for ADC reference supplies. |
| Operating Junction Temp | –40°C to +125°C - qualified for factory automation, elevator controls, and outdoor HVAC equipment. |
| Thermal Shutdown | 165°C with 148°C hysteresis - prevents latch-up during transient overloads while allowing safe recovery. |
Pinout & Package
The LMR33630BDDAR is packaged in an 8-pin HSOIC (5.00 mm × 4.00 mm) with PowerPAD™ thermal pad, optimized for high-power density and simplified PCB layout using standard through-hole or surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Primary return path for high-current switch node; must be connected directly to thermal pad and system ground plane with wide copper pour. |
| 2 (VIN) | Input Supply | Accepts 3.8–36 V input; requires local 10 µF ceramic capacitor tied directly to PGND to suppress high-frequency ripple. |
| 3 (EN) | Enable Input | Logic-controlled startup with precision thresholds (1.231 V typ. turn-on); supports external UVLO via resistor divider. |
| 4 (PG) | Power-Good Flag | Open-drain output signaling valid regulation (±2% window around FB voltage); requires external pull-up for MCU reset or sequencing. |
| 5 (FB) | Feedback Input | Connects to resistor divider tap; senses output voltage with 1.0 V reference; must not float or short to AGND. |
| 6 (VCC) | Internal LDO Output | 5 V ±5% supply for internal circuitry; decoupled with 1 µF ceramic to AGND; not for external loading. |
| 7 (BOOT) | Bootstrap Supply | Drives high-side MOSFET gate; requires 100 nF ceramic capacitor between BOOT and SW pins. |
| 8 (SW) | Switch Node | Connects to power inductor; carries high di/dt switching current; must use short, wide trace to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | 75 mΩ HS / 50 mΩ LS RDS(on) reduces conduction loss and eliminates external FET layout complexity. |
| Peak-Current-Mode Control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistors. |
| Integrated Compensation Network | Eliminates 3–4 external compensation components, reducing BOM count and design validation time. |
| HotRod™-Compatible Layout | Symmetrical VIN/PGND pin placement minimizes loop inductance and cuts EMI by >10 dB compared to conventional SOIC. |
| Power-Good & Precision Enable | Enables reliable system power sequencing and brown-out detection without external supervisors or comparators. |
| Thermal Foldback & Hiccup Mode | Prevents thermal runaway under sustained overload or short-circuit conditions while preserving component reliability. |
Applications
| Motor Drive Inverters | PLC CPU Power |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V logic rails for gate drivers and microcontrollers in AC variable-frequency drives and drone ESCs. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise, high-efficiency DC power with fast transient response to handle PWM-induced load steps. Use Value: 1.4 MHz switching allows <2.2 µH inductors and <22 µF output capacitance, reducing board area by >35% vs. 400 kHz alternatives. | Use Scenario: Powers ARM Cortex-M7-based PLC CPUs and real-time Ethernet PHYs in factory automation cabinets. IC Role / Device Role / Timing Role: Main system regulator delivering stable 1.2 V or 1.8 V core voltage with tight load regulation (<±1.5%) across –40°C to +70°C ambient. Use Value: Integrated VCC LDO and precision enable simplify power sequencing; PG flag enables deterministic firmware boot after rail stabilization. |
| HVAC Control Units | Elevator Safety Controllers |
Use Scenario: Regulates 5 V for sensor interfaces, display controllers, and wireless communication modules in commercial HVAC panels. IC Role / Device Role / Timing Role: Wide-input buck converter handling unregulated 24 V DC bus with surge tolerance up to 36 V and reverse-polarity protection via external diode. Use Value: 25 µA quiescent current extends battery backup runtime during AC mains failure; 125°C junction rating ensures reliability in sealed enclosures. | Use Scenario: Provides certified 3.3 V supply for SIL-2 safety logic in elevator door interlock and brake monitoring circuits. IC Role / Device Role / Timing Role: Functional-safety-capable regulator with documented FIT rate, thermal shutdown, and hiccup-mode fault containment per IEC 61508. Use Value: Power-good flag synchronizes safety MCU reset with output stabilization; EN pin supports external watchdog-controlled shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630ADDA | 400 kHz switching frequency; higher RDS(on) (95 mΩ HS / 66 mΩ LS); same HSOIC package. | Better suited for noise-sensitive audio or RF subsystems where lower frequency simplifies EMI filtering. | Select when lower EMI priority outweighs size constraints; requires larger inductor (≥4.7 µH) and output cap. |
| LMR33630BRNX | Same 1.4 MHz frequency but in 12-pin 3 mm × 2 mm VQFN with wettable flanks; lower RDS(on) (75 mΩ HS / 50 mΩ LS). | Preferred for space-constrained designs requiring higher thermal performance and automated optical inspection (AOI) compatibility. | Choose for next-gen compact industrial modules; requires re-layout due to different pinout and footprint. |
Compared with LMR33630ADDA, the LMR33630BDDAR delivers smaller solution size and better light-load efficiency; compared with LMR33630BRNX, it trades thermal performance and AOI capability for legacy HSOIC compatibility and simpler assembly.
Availability
LMR33630BDDAR is available at Aetrix Electronics and suitable for motor drive inverters, PLC CPU power rails, HVAC control units, and elevator safety controllers requiring stable component supply across extended industrial temperature ranges and multi-year production cycles.
Supply support for LMR33630BDDAR 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 industrial-grade product development and automotive qualification expertise.
The LMR33630BDDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically for rugged industrial applications demanding high reliability, wide input range, and minimal external component count.
FAQ
What is the switching frequency of the LMR33630BDDAR?
The LMR33630BDDAR operates at a fixed 1.4 MHz switching frequency. This value is factory-trimmed and cannot be adjusted externally. The 1.4 MHz frequency enables compact magnetic design and helps avoid interference with common radio bands. It is specified across the full operating temperature range (–40°C to +125°C) and input voltage range (3.8 V to 36 V), with typical variation of ±10%.
Does the LMR33630BDDAR require external compensation components?
No, the LMR33630BDDAR includes an integrated compensation network. This eliminates the need for external Type-II or Type-III compensation networks, reducing BOM count by up to four components and simplifying layout. The internal compensation is optimized for stability with standard 2.2 µH inductors and 22 µF ceramic output capacitors across the full output voltage range (1 V to 24 V).
What is the purpose of the PG (power-good) pin on the LMR33630BDDAR?
The PG pin on the LMR33630BDDAR is an open-drain output that signals when the regulated output voltage is within ±2% of its target value. It asserts high after soft-start completes and de-asserts low during faults such as overcurrent, thermal shutdown, or undervoltage. The LMR33630BDDAR includes a 170 µs glitch filter to prevent false triggering during transients. External pull-up to VCC or VOUT is required for proper operation.
Can the LMR33630BDDAR operate with an input voltage below 3.8 V?
No, the LMR33630BDDAR has a minimum recommended input voltage of 3.8 V. Below this threshold, the device may fail to regulate or enter undervoltage lockout (UVLO). The absolute maximum rating allows only –0.3 V below PGND, but functional operation is not guaranteed below 3.8 V. For sub-3.8 V inputs, consider the LMR33620 or other lower-VIN alternatives.
What package type does the LMR33630BDDAR use, and what are its thermal characteristics?
The LMR33630BDDAR uses an 8-pin HSOIC package (5.00 mm × 4.00 mm) with PowerPAD™ thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 42.9°C/W on a 4-layer JEDEC board. The thermal pad must be soldered to a large copper ground plane to achieve rated 3 A output current and maintain junction temperature ≤125°C under full load at +70°C ambient.
LMR33630BDDAR 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:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR33630BDDAR FAQ
1.How can I place an order for LMR33630BDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630BDDAR 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 LMR33630BDDAR reliable?
The price and inventory of LMR33630BDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630BDDAR is usually 5 days.
3.What payment methods are accepted for LMR33630BDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630BDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630BDDAR?
LMR33630BDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630BDDAR 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 LMR33630BDDAR?
For technical support, including LMR33630BDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630BDDAR requirements.
6.How does Aetrix verify that LMR33630BDDAR is sourced from the original manufacturer or authorized distributors?
All LMR33630BDDAR 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 LMR33630BDDAR meets industry standards.
7.What is the process for return or replacement of LMR33630BDDAR?
All LMR33630BDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630BDDAR, 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 LMR33630BDDAR part is unused and in its original packaging.
Return procedure for LMR33630BDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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