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Texas Instruments LMR33610ADDAR
- Part No.:
- LMR33610ADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33610ADDAR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,417
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Product details
Overview
LMR33610ADDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering up to 1 A output current across a 3.8 V to 36 V input range, with adjustable output from 1 V to 24 V. It employs peak-current mode control, operates over –40°C to +125°C junction temperature, and integrates internal compensation for minimal external components-used in industrial motor drives, PLCs, and wide-VIN power supplies.
For engineers reviewing the LMR33610ADDAR datasheet, LMR33610ADDAR pinout, LMR33610ADDAR application, or LMR33610ADDAR equivalent, key selection criteria include its 400-kHz/1.4-MHz dual-frequency option, 95%+ peak efficiency, 5 µA shutdown quiescent current, precision enable thresholds (1.231 V typical), and power-good flag with glitch filtering.
Technical Context
The LMR33610ADDAR uses peak-current mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency while delivering stable regulation across wide input/output ranges. Its integrated high-side (95–160 mΩ) and low-side (66–110 mΩ) MOSFETs support continuous 1-A operation with cycle-by-cycle current limiting and hiccup-mode short-circuit protection.
It features a precision enable input with 100-mV hysteresis, a 1-V feedback reference (±1.5% tolerance), and an open-drain power-good flag with programmable upper/lower thresholds (±5% and ±7% of VFB). Thermal shutdown activates at 165°C with 148°C recovery, and the device supports seamless integration via internal compensation and optimized HSOIC-8 PowerPAD™ layout.
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 | 1 A continuous - sufficient for powering microcontrollers, sensors, I/O modules, and gate drivers in compact industrial nodes. |
| Switching Frequency | 400 kHz (A version) - enables use of small, cost-effective 2.2–4.7 µH inductors while balancing EMI and efficiency. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on or low-power standby applications. |
| Feedback Reference | 1.000 V ±1.5% - ensures precise output voltage setting across temperature and load, critical for ADC references and analog circuitry. |
| Thermal Shutdown | 165°C activation / 148°C recovery - provides robust overtemperature protection with hysteresis to prevent thermal cycling. |
| Power-Good Flag | Open-drain, 60–150 Ω RDS(on), 60–170 µs glitch filter - enables reliable system reset and sequencing without external logic. |
Pinout & Package
The LMR33610ADDAR is housed in an 8-pin HSOIC (DDA) package with exposed thermal pad (5.00 mm × 4.00 mm), designed for enhanced thermal performance and simplified PCB layout using TI's PowerPAD™ technology.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power ground | Primary return path for high-current switch node; must be connected to low-impedance ground plane and bypass capacitor. |
| 2 VIN | Input supply | High-voltage input rail connection; requires local ceramic bypass capacitor directly to PGND for stability and EMI suppression. |
| 3 EN | Enable control | Logic-level input with precision 1.231 V rising threshold; supports external UVLO via resistor divider or direct tie to VIN. |
| 4 PG | Power-good flag | Open-drain output indicating regulated output; requires external pull-up; asserts low during fault, startup, or EN deactivation. |
| 5 FB | Feedback input | Connects to resistor divider tap; senses output voltage against 1-V internal reference; determines final regulated output value. |
| 6 VCC | Internal LDO output | 5-V internal supply for control circuitry; not for external loading; requires 1-µF ceramic capacitor to AGND. |
| 7 BOOT | Bootstrap supply | Drives high-side FET gate; connects via 100-nF capacitor to SW pin to sustain gate drive during high-side conduction. |
| 8 SW | Switch node | Connection point for power inductor and CBOOT; carries high di/dt switching current; requires short, wide copper traces. |
| Thermal Pad | Analog ground & thermal path | Serves as AGND reference and primary heat dissipation path; must be soldered to solid ground plane for electrical and thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates need for external power switches; reduces BOM count and layout complexity while ensuring matched timing and protection. |
| Internal loop compensation | Enables stable operation with only input/output capacitors and feedback resistors-no external compensation network required. |
| Auto PFM/PWM mode transition | Maintains >90% efficiency down to 1 mA load by entering diode-emulation PFM at light loads, reducing quiescent current impact. |
| Pin-to-pin scalability | Shares identical footprint with LMR33620/30/40 (2–4 A) and LMR36510/20 (65 V, 1–2 A), enabling power-stage upgrades without PCB redesign. |
| Hiccup-mode short-circuit protection | Limits average power dissipation during sustained faults by cycling on/off with 94-ms off-time, preventing thermal runaway. |
Applications
| Motor Drive Systems | Factory Automation |
|---|---|
Use Scenario: Powering flight controllers and ESCs in industrial drones and servo amplifiers requiring clean, stable 5-V or 3.3-V rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24-V bus to logic-level supply for MCU, gate drivers, and position sensors. Use Value: 95% peak efficiency and 25-µA quiescent current extend operational time; PFM mode maintains >85% efficiency at 10-mA loads. |
Use Scenario: Providing regulated 3.3-V and 5-V supplies for PLC I/O modules, HMI displays, and HVAC controller MCUs. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage replacing discrete buck solutions in DIN-rail mounted industrial enclosures. Use Value: –40°C to +125°C operation and 36-V max input withstand surges common in factory wiring; SOIC package simplifies automated assembly. |
| Wide-VIN Industrial Power Supply | Building Management Systems |
Use Scenario: Generating multiple isolated or non-isolated rails from unregulated 12–36-V DC sources in distributed control cabinets. IC Role / Device Role / Timing Role: Flexible adjustable-output buck converter supporting 1–24-V outputs via external resistor divider. Use Value: Adjustable frequency (400 kHz or 1.4 MHz) allows optimization for size vs. EMI; internal soft-start prevents inrush-induced brownouts. |
Use Scenario: Powering elevator main control panels, access control units, and smart lighting gateways with long cable runs. IC Role / Device Role / Timing Role: Input-supply regulator handling line transients and brownouts common in building mains-derived DC systems. Use Value: Input UVLO (3.8 V min) and thermal shutdown ensure safe operation during undervoltage events; PG flag enables system-level fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620ADDAR | Same HSOIC-8 package, 2-A output rating, identical pinout and feature set. | Used where higher output current is needed without changing PCB layout or control interface. | Select when load exceeds 1 A but board space and design reuse are priorities. |
| LMR36510ADJ | 65-V max input, same 1-A rating and adjustable output, but in 8-pin SO PowerPAD™ (WSON) package. | Required for applications with input surges beyond 36 V (e.g., automotive cold-crank, industrial 48-V systems). | Choose when extended input voltage range is mandatory and WSON thermal performance is acceptable. |
Compared with LMR33610ADDAR, LMR33620ADDAR offers higher current headroom within identical mechanical and electrical interfaces, while LMR36510ADJ trades package type and thermal profile for 65-V surge tolerance-neither is pin-compatible without layout revision, but both share functional alignment for scalable power design.
Availability
LMR33610ADDAR is available at Aetrix Electronics and suitable for motor drive systems, factory automation equipment, and wide-VIN industrial power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LMR33610ADDAR 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 LMR33610ADDAR belongs to TI's SIMPLE SWITCHER® family-designed specifically for rugged, easy-to-deploy DC/DC conversion in harsh industrial environments where layout simplicity, thermal robustness, and long-term supply stability are critical.
FAQ
What is the maximum input voltage supported by the LMR33610ADDAR?
The LMR33610ADDAR supports a maximum input voltage of 36 V, with absolute maximum rating up to 38 V. Operation above 36 V risks exceeding recommended conditions and may trigger input overvoltage protection or damage. The device is rated for continuous operation from 3.8 V to 36 V, making it ideal for 24-V industrial buses and 36-V battery systems. Always verify input transient margins in your application per Section 7.1 of the LMR33610ADDAR datasheet.
Does the LMR33610ADDAR require external compensation components?
No, the LMR33610ADDAR features fully integrated internal loop compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces BOM count, saves PCB area, and accelerates design cycle-only input/output capacitors and the FB resistor divider are required for basic operation. The internal compensation is optimized for stability across the full 1-A load range and 3.8–36-V input span, as verified in TI's LMR33610ADDAR reference designs.
What is the purpose of the BOOT and SW pins on the LMR33610ADDAR?
The BOOT pin provides the bootstrap voltage for the internal high-side MOSFET gate driver, connected via a 100-nF capacitor to the SW (switch node) pin. The SW pin is the drain-source connection point of the internal power switches and links to the inductor. Together, they enable efficient high-side FET conduction without requiring a floating gate driver supply. Incorrect BOOT-to-SW capacitor placement or value causes startup failure or erratic switching in the LMR33610ADDAR.
Can the LMR33610ADDAR be used in automotive applications?
The LMR33610ADDAR is specified for industrial temperature range (–40°C to +125°C) and meets key automotive stress requirements like 36-V input and thermal shutdown, but it is not AEC-Q200 qualified or automotive-grade screened. It has been deployed in non-safety-critical automotive subsystems (e.g., infotainment power rails), yet TI does not guarantee automotive qualification for LMR33610ADDAR. For ASIL-compliant designs, consult TI's automotive-qualified alternatives such as the LM61480-Q1.
How does the power-good (PG) flag behave during startup and fault conditions in the LMR33610ADDAR?
The LMR33610ADDAR PG pin is an open-drain output that remains low for ~4 ms after EN assertion, then goes high when output reaches 95% of target (e.g., 4.75 V for 5-V output). It pulls low during undervoltage (below 90% VFB), overvoltage (above 110% VFB), thermal shutdown, current limit, or EN deactivation. A built-in 60–170 µs glitch filter rejects brief transients. The PG signal is valid down to VIN = 2 V even with EN = 0, enabling robust system monitoring in the LMR33610ADDAR.
LMR33610ADDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 1A
- 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
LMR33610ADDAR FAQ
1.How can I place an order for LMR33610ADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33610ADDAR 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 LMR33610ADDAR reliable?
The price and inventory of LMR33610ADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33610ADDAR is usually 5 days.
3.What payment methods are accepted for LMR33610ADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33610ADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33610ADDAR?
LMR33610ADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33610ADDAR 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 LMR33610ADDAR?
For technical support, including LMR33610ADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33610ADDAR requirements.
6.How does Aetrix verify that LMR33610ADDAR is sourced from the original manufacturer or authorized distributors?
All LMR33610ADDAR 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 LMR33610ADDAR meets industry standards.
7.What is the process for return or replacement of LMR33610ADDAR?
All LMR33610ADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33610ADDAR, 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 LMR33610ADDAR part is unused and in its original packaging.
Return procedure for LMR33610ADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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