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Texas Instruments LMR33610BDDAR
- Part No.:
- LMR33610BDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR33610BDDAR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
LMR33610BDDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering 1 A output current across 3.8 V to 36 V input, with adjustable 1 V–24 V output, 1.4 MHz switching frequency, and peak efficiency >95%. It serves as the primary industrial-grade power supply IC in motor drives, PLCs, and HVAC control panels.
For engineers reviewing the LMR33610BDDAR datasheet, LMR33610BDDAR pinout, LMR33610BDDAR application, or LMR33610BDDAR equivalent, key selection criteria include its 1.4 MHz fixed-frequency operation, precision enable threshold (1.231 V typ), integrated compensation, thermal shutdown (165°C), and HSOIC-8 package with PowerPAD™ for enhanced thermal performance.
Technical Context
The LMR33610BDDAR employs peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency. Its internal 5-V LDO powers control circuitry via VCC, while the bootstrap circuit (BOOT–SW) enables high-side FET drive without external charge pumps.
It integrates cycle-by-cycle current limiting (HS limit: 3.4 A typ), hiccup-mode short-circuit protection (94 ms off-time), and precision power-good flag with 105–110% rising threshold and 60–170 µs glitch filter-enabling reliable system sequencing and fault monitoring in rugged environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide industrial rail inputs including 12 V, 24 V, and 36 V battery or bus systems. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, gate drivers, and communication interfaces in embedded systems. |
| Switching Frequency | 1.4 MHz (B version) - enables compact magnetics and low-profile designs; avoids AM radio band interference. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on or low-power standby applications. |
| Feedback Reference | 1.0 V ±1.5% - provides tight output regulation accuracy across temperature and load for stable downstream logic supplies. |
| Thermal Shutdown | 165°C activation / 148°C recovery - protects against sustained overloads and poor heatsinking in enclosed enclosures. |
| Power-Good Flag | Open-drain PG with 105–110% upper / 90–95% lower thresholds - ensures robust system reset and sequencing without external comparators. |
Pinout & Package
The LMR33610BDDAR is housed in an 8-pin HSOIC (DDA) package measuring 5.00 mm × 4.00 mm, featuring an exposed thermal pad (PowerPAD™) soldered to PCB ground for optimal thermal dissipation (RθJB = 13.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Main return path for high-current switch node; must connect directly to thermal pad and system ground plane with wide copper. |
| 2 VIN | Input Supply | Primary DC input connection; requires local 10–22 µF ceramic capacitor to PGND for EMI suppression and transient response. |
| 3 EN | Enable Input | Logic-level control with precision 1.231 V rising threshold; supports external UVLO via resistor divider for input voltage supervision. |
| 4 PG | Power-Good Flag | Open-drain output indicating regulated output; requires external pull-up (e.g., to VOUT or VCC) for system reset signaling. |
| 5 FB | Feedback Input | Resistive divider tap point; senses output voltage and closes regulation loop with internal 1.0 V reference. |
| 6 VCC | Internal LDO Output | 5 V ±2.5% supply for internal circuitry; decoupled with 1 µF ceramic to AGND; not for external loading. |
| 7 BOOT | Bootstrap Supply | Drives high-side MOSFET gate; connects via 100 nF capacitor to SW pin to sustain gate voltage during high-side conduction. |
| 8 SW | Switch Node | Connection to inductor and CBOOT; carries high di/dt; requires minimal trace length and solid ground return to reduce EMI. |
| Thermal Pad | Analog Ground / Thermal Path | Serves as AGND reference and primary heat sink; must be soldered to large PCB ground plane for electrical integrity and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation | Eliminates external Type-II/III compensation network - reduces BOM count, layout area, and tuning effort for stable 1-A operation. |
| Auto PFM/PWM Mode | Transitions seamlessly between pulse-frequency modulation (light load) and pulse-width modulation (heavy load) - maintains >85% efficiency down to 1 mA output. |
| High-Side + Low-Side FETs | 95 mΩ HS / 66 mΩ LS RDS(on) - minimizes conduction losses and thermal rise at full 1-A load across 36-V input. |
| Minimum On/Off Times | 108 ns tON-MIN / 85 ns tOFF-MIN - enables stable 1.4-MHz operation even at high duty cycles (e.g., 3.3 V out from 5 V in). |
| Hiccup Short-Circuit Protection | 94-ms off-time with automatic restart - limits average power dissipation during hard shorts, preventing thermal runaway without manual reset. |
Applications
| Motor Drive Systems | Factory Automation |
|---|---|
Use Scenario: Powering flight controller logic, ESC gate drivers, and IMU sensors in battery-powered drones with 12–24 V LiPo input. IC Role / Device Role / Timing Role: Primary 3.3 V/5 V buck regulator supplying MCU core, CAN transceivers, and analog front-end circuits. Use Value: 1.4 MHz switching enables small 1.5 µH inductors and <1000 µF output capacitance, reducing board space by >30% vs. 400-kHz alternatives. | Use Scenario: Providing isolated 5 V and 3.3 V rails for PLC I/O modules, HMI display controllers, and Ethernet PHYs in industrial cabinets. IC Role / Device Role / Timing Role: Main point-of-load regulator converting 24 V DC bus to stable logic supplies with precise power-good sequencing. Use Value: Precision enable (±10 mV hysteresis) and PG flag ensure deterministic startup/shutdown coordination across multi-rail systems. |
| Wide-VIN DC/DC Power Supply | Elevator Control Panel |
Use Scenario: Replacing linear regulators in legacy 24 V industrial equipment requiring 3.3 V or 5 V for microcontroller subsystems. IC Role / Device Role / Timing Role: High-efficiency synchronous buck replacing inefficient 7805-style solutions in space-constrained enclosures. Use Value: >95% peak efficiency and 5 µA shutdown current extend uptime in energy-sensitive applications and reduce thermal management burden. | Use Scenario: Delivering reliable 5 V power to safety-critical elevator main control boards operating from fluctuating 36 V battery or rectified AC input. IC Role / Device Role / Timing Role: Ruggedized primary regulator with –40°C to +125°C junction rating and thermal shutdown for unventilated control cabinets. Use Value: 165°C thermal shutdown with 17°C hysteresis prevents latch-up during ambient temperature spikes, ensuring fail-safe operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33610ADDAR | Same HSOIC-8 package and 1-A rating, but 400 kHz switching frequency - higher inductor size, lower EMI, better light-load PFM efficiency. | Better suited for noise-sensitive analog systems or where larger magnetics are acceptable. | Select when EMI compliance (CISPR 25 Class 5) is prioritized over board area; not pin-compatible due to different frequency setting. |
| LMR36510BDDAR | 65 V max input, same 1.4 MHz frequency and HSOIC-8 package - higher voltage rating, identical pinout and compensation. | Required for 48 V telecom, PoE++, or automotive start-stop systems with load dump transients. | Drop-in replacement only if input exceeds 36 V; otherwise over-specified voltage rating increases cost without benefit. |
Compared with LMR33610ADDAR, the LMR33610BDDAR trades lower EMI for smaller passive components; compared with LMR36510BDDAR, it offers optimized cost and thermal performance for ≤36 V industrial rails without unnecessary voltage overhead.
Availability
LMR33610BDDAR is available at Aetrix Electronics and suitable for motor drive systems, factory automation controllers, and wide-VIN DC/DC power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LMR33610BDDAR 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 LMR33610BDDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC converters, designed specifically for rugged industrial power conversion where simplicity, thermal robustness, and long-term supply stability are critical.
FAQ
What is the switching frequency of the LMR33610BDDAR?
The LMR33610BDDAR operates at a fixed 1.4 MHz nominal switching frequency, as designated by the "B" suffix in its part number. This frequency is internally set and does not require external timing components. It enables compact magnetic design and helps avoid sensitive frequency bands such as AM radio reception. The device maintains this frequency across its full input range (3.8 V–36 V) and load conditions up to 1 A, with typical variation of ±140 kHz per datasheet Section 7.5.
Does the LMR33610BDDAR require external compensation components?
No, the LMR33610BDDAR features fully integrated internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and improves consistency across production units. The internal compensation is optimized for stable operation with standard 1.5 µH–4.7 µH inductors and ceramic output capacitors, as validated in TI's reference designs for the LMR33610BDDAR.
What is the purpose of the BOOT and SW pins on the LMR33610BDDAR?
The BOOT and SW pins on the LMR33610BDDAR form the bootstrap gate-drive circuit for the internal high-side MOSFET. A 100-nF ceramic capacitor connects BOOT to SW, charging during the low-side conduction phase to provide sufficient gate voltage (>5 V) for full enhancement of the high-side FET. This self-contained architecture removes the need for external charge pumps or floating bias supplies, enabling efficient synchronous rectification in the LMR33610BDDAR's 8-pin HSOIC package.
How does the power-good (PG) function work on the LMR33610BDDAR?
On the LMR33610BDDAR, the open-drain PG pin asserts high (when pulled up externally) only when the output voltage remains within 90–110% of the target (e.g., 90–110% of 5 V = 4.5–5.5 V), with built-in 60–170 µs glitch filtering to ignore brief transients. It goes low during startup until soft-start completes (~4 ms), during undervoltage, overvoltage, thermal shutdown, or current-limit faults. When EN is low, PG is forced low regardless of output condition - ensuring coordinated system reset in the LMR33610BDDAR's industrial applications.
Can the LMR33610BDDAR be used in automotive applications?
The LMR33610BDDAR is qualified for industrial temperature range (–40°C to +125°C junction) and supports input voltages up to 36 V, making it suitable for certain 12 V/24 V automotive subsystems such as body control modules, infotainment displays, or ADAS sensor power rails - provided transient protection (e.g., TVS diode on VIN) is added for load dump. However, it is not AEC-Q200 qualified or specified for automotive-grade qualification testing; for full automotive use, TI recommends the pin-compatible LMR33610QDAPR (automotive-grade variant) instead of the LMR33610BDDAR.
LMR33610BDDAR 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:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR33610BDDAR FAQ
1.How can I place an order for LMR33610BDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33610BDDAR 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 LMR33610BDDAR reliable?
The price and inventory of LMR33610BDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33610BDDAR is usually 5 days.
3.What payment methods are accepted for LMR33610BDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33610BDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33610BDDAR?
LMR33610BDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33610BDDAR 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 LMR33610BDDAR?
For technical support, including LMR33610BDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33610BDDAR requirements.
6.How does Aetrix verify that LMR33610BDDAR is sourced from the original manufacturer or authorized distributors?
All LMR33610BDDAR 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 LMR33610BDDAR meets industry standards.
7.What is the process for return or replacement of LMR33610BDDAR?
All LMR33610BDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33610BDDAR, 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 LMR33610BDDAR part is unused and in its original packaging.
Return procedure for LMR33610BDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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