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Texas Instruments LMR33630CDDAR
- Part No.:
- LMR33630CDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33630CDDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:822
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Product details
Overview
LMR33630CDDAR 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 to 24 V), fixed 2.1 MHz switching frequency, and integrated 75-mΩ/50-mΩ MOSFETs in an 8-pin HSOIC package. It serves as the primary voltage regulator in space-constrained motor drive and automation control systems.
For engineers reviewing the LMR33630CDDAR datasheet, LMR33630CDDAR pinout, LMR33630CDDAR application, or LMR33630CDDAR equivalent, key selection criteria include its 2.1 MHz operation enabling compact magnetics, precision enable threshold (1.231 V typ), power-good flag with glitch filtering (60–170 µs), thermal shutdown at 165°C, and support for wide-VIN industrial environments requiring high light-load efficiency (25 µA quiescent current).
Technical Context
The LMR33630CDDAR employs peak-current-mode control with automatic PFM/PWM mode transition to maintain >95% peak efficiency across load range. Its architecture integrates compensation, soft-start (2.9–6 ms), and hiccup-mode short-circuit protection triggered by FB voltage dropping below 0.4 V.
It features a precision enable input with 100 mV hysteresis, open-drain power-good flag referenced to FB (±3% window), and minimum on-time of 75 ns (DDA package) enabling regulation down to 3.8 V input at 3.3 V output. The 8-pin HSOIC package uses PowerPAD™ thermal pad for enhanced thermal performance (RθJA = 42.9°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide industrial rails including 12 V, 24 V, and 36 V battery/supply systems without pre-regulation. |
| Output Current | 3 A continuous - sufficient to power microcontrollers, gate drivers, sensors, and communication ICs in PLC CPU or servo modules. |
| Switching Frequency | 2.1 MHz (C-version, DDA package) - enables use of sub-2.2 µH inductors and reduces solution footprint vs. lower-frequency alternatives. |
| Quiescent Current | 25 µA typical - extends battery life in always-on industrial monitoring nodes and low-power wake-up circuits. |
| Feedback Reference | 1.0 V ±1.5% - provides tight output regulation accuracy for sensitive analog or mixed-signal loads. |
| Thermal Shutdown | 165°C activation / 148°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Power-Good Delay | ~4 ms startup delay - ensures stable output before releasing system reset, preventing premature MCU boot. |
Pinout & Package
The LMR33630CDDAR is housed in an 8-pin HSOIC package (5.00 mm × 4.00 mm) with exposed PowerPAD™ thermal pad on the bottom for PCB-level heat dissipation and AGND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Main return path for high-current switch node; must be connected to system ground plane with short, wide traces and tied to AGND. |
| 2 (VIN) | Input Supply | Primary DC input (3.8–36 V); requires local 10–22 µF ceramic bypass capacitor directly to PGND. |
| 3 (EN) | Enable Input | Logic-controlled start-up; 1.231 V typical rising threshold enables regulation; hysteresis prevents chatter near UVLO. |
| 4 (PG) | Power-Good Flag | Open-drain output indicating regulated output; pulls low during fault, startup, or EN deassertion; requires external pull-up. |
| 5 (FB) | Feedback Input | Resistive divider tap point; regulates output to 1.0 V reference; must not float or connect directly to GND. |
| 6 (VCC) | Internal LDO Output | 5 V ±2.5% internal supply; powers control circuitry; requires 1 µF ceramic capacitor 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 | Connection to power inductor; carries high di/dt switching current; layout critical for EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | 75-mΩ HS / 50-mΩ LS RDS(on) in HSOIC - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Peak-Current-Mode Control | Fast transient response with inherent cycle-by-cycle current limiting - improves stability under dynamic load steps in motor drive applications. |
| Auto PFM/PWM Transition | Maintains >85% efficiency at 1 mA load while delivering >95% peak efficiency - extends battery runtime without manual mode selection. |
| HotRod™-Inspired Layout | Symmetrical VIN/PGND pin placement minimizes loop inductance - reduces EMI emissions and switch-node ringing in noise-sensitive factory automation systems. |
| Functional Safety Support | Documentation available for ISO 26262/IEC 61508 system-level analysis - enables use in ASIL-B or SIL2-rated subsystems like elevator control or HVAC safety logic. |
Applications
| Motor Drive Systems | Factory Automation Controllers |
|---|---|
Use Scenario: Powering gate drivers and position feedback sensors in drone ESCs and AC inverters. IC Role / Device Role / Timing Role: Primary 5 V or 12 V buck regulator supplying isolated gate driver bias and encoder interface ICs. Use Value: 2.1 MHz operation allows <1 µH inductors, shrinking total power stage volume by >40% vs. 400 kHz alternatives. | Use Scenario: Providing clean, regulated 3.3 V for PLC CPU core logic and fieldbus transceivers (RS-485/CAN). IC Role / Device Role / Timing Role: Main system rail converter with power-good signaling to coordinate safe boot sequence. Use Value: Precision enable (1.231 V) and 4 ms PG delay ensure deterministic reset timing across temperature and input voltage variation. |
| HVAC Control Units | Elevator Safety Logic |
Use Scenario: Converting 24 V DC bus to 5 V for microcontroller, display, and environmental sensor subsystems. IC Role / Device Role / Timing Role: Wide-VIN front-end regulator supporting brownout resilience during HVAC compressor cycling. Use Value: 3.8 V minimum input enables operation during 24 V rail sag to 4 V, avoiding system reset during motor startup. | Use Scenario: Delivering 3.3 V to safety-critical monitoring MCUs in elevator door controllers and brake logic units. IC Role / Device Role / Timing Role: Functional safety-capable power supply with documented failure modes and FIT data. Use Value: Thermal shutdown (165°C) and hiccup-mode short-circuit protection prevent thermal runaway in sealed mechanical 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 |
|---|---|---|---|
| LMR33630BDDAR | 1.4 MHz switching frequency; higher RDS(on) (95/66 mΩ); identical pinout and package. | Better EMI filtering margin at lower frequency; slightly reduced light-load efficiency due to higher MOSFET losses. | Select when board layout constraints favor larger inductors or when EMI compliance testing shows marginal margin at 2.1 MHz. |
| TPS543320RHLT | 3 A, 4.5–18 V input, 1.8 MHz, integrated FETs, but no power-good flag or precision enable. | Lacks PG and EN hysteresis; requires external monitoring circuitry for system reset coordination. | Choose only if input voltage is strictly ≤18 V and functional safety documentation is not required. |
Compared with LMR33630BDDAR, the LMR33630CDDAR trades marginally higher conduction loss for significantly smaller passive components and faster transient response; versus TPS543320RHLT, it adds critical system-level features (PG, precision EN, safety docs) essential for industrial control integrity.
Availability
LMR33630CDDAR is available at Aetrix Electronics and suitable for motor drive systems, factory automation controllers, HVAC control units, and elevator safety logic requiring stable component supply across extended product lifecycles.
Supply support for LMR33630CDDAR 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 reliability validation.
The LMR33630 belongs to TI's SIMPLE SWITCHER® family-designed specifically for rugged, wide-input-voltage DC/DC conversion in harsh environments where thermal robustness, EMI control, and long-term supply assurance are mandatory.
FAQ
What is the switching frequency of the LMR33630CDDAR?
The LMR33630CDDAR operates at a fixed 2.1 MHz switching frequency, as defined by its "C" version designation in the DDA (HSOIC) package. This frequency enables compact magnetic design and fast transient response. It is not user-adjustable and remains stable over temperature and line/load variations per the datasheet's electrical characteristics table.
Does the LMR33630CDDAR support adjustable output voltage?
Yes, the LMR33630CDDAR supports fully adjustable output voltage from 1 V to 24 V using an external resistive feedback divider connected to the FB pin. The internal reference is 1.0 V ±1.5%, and the device regulates based on the voltage divider ratio. No external compensation is required due to its integrated compensation network.
What protection features does the LMR33630CDDAR include?
The LMR33630CDDAR includes thermal shutdown (165°C trip, 148°C recovery), cycle-by-cycle current limit, hiccup-mode short-circuit protection, input undervoltage lockout (UVLO), and power-good flag assertion during faults. These protections operate autonomously without external components and are validated across –40°C to +125°C junction temperature.
Can the LMR33630CDDAR be used in automotive applications?
The LMR33630CDDAR itself is not AEC-Q100 qualified; however, a pin-compatible AEC-Q100-qualified variant (LMR33630QDDAR) exists. For non-safety-critical automotive auxiliary systems operating within its –40°C to +125°C junction range and 3.8–36 V input, the LMR33630CDDAR may be considered-but formal qualification requires the Q-part number and associated documentation.
How is thermal performance managed in the LMR33630CDDAR HSOIC package?
The LMR33630CDDAR in HSOIC (DDA) uses a PowerPAD™ thermal pad on the underside, which must be soldered to a large copper pour on the PCB for effective heat transfer. With proper layout, its RθJA is 42.9°C/W (JEDEC 4-layer board), enabling 3 A continuous operation at ambient temperatures up to 85°C without forced airflow.
LMR33630CDDAR 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:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR33630CDDAR FAQ
1.How can I place an order for LMR33630CDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630CDDAR 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 LMR33630CDDAR reliable?
The price and inventory of LMR33630CDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630CDDAR is usually 5 days.
3.What payment methods are accepted for LMR33630CDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630CDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630CDDAR?
LMR33630CDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630CDDAR 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 LMR33630CDDAR?
For technical support, including LMR33630CDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630CDDAR requirements.
6.How does Aetrix verify that LMR33630CDDAR is sourced from the original manufacturer or authorized distributors?
All LMR33630CDDAR 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 LMR33630CDDAR meets industry standards.
7.What is the process for return or replacement of LMR33630CDDAR?
All LMR33630CDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630CDDAR, 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 LMR33630CDDAR part is unused and in its original packaging.
Return procedure for LMR33630CDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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