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Texas Instruments LMR33620BRNXR
- Part No.:
- LMR33620BRNXR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620BRNXR.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LMR33620BRNXR from Texas Instruments is a synchronous step-down DC/DC converter delivering 2 A output current across 3.8 V to 36 V input, with fixed 1.4 MHz switching frequency, adjustable 1 V–24 V output voltage, peak efficiency >95%, and operation from –40°C to +125°C junction temperature. It serves as the primary power stage in industrial motor drives and PLC CPU supplies.
For engineers reviewing the LMR33620BRNXR datasheet, LMR33620BRNXR pinout, LMR33620BRNXR application, or LMR33620BRNXR equivalent, key selection criteria include its 1.4 MHz frequency option in the 3 mm × 2 mm VQFN package, integrated compensation, precision enable threshold (1.231 V typ), and open-drain power-good flag with glitch filtering.
Technical Context
This device implements peak-current-mode control with automatic PFM/PWM mode transition for high light-load efficiency. Its architecture supports ultra-low dropout operation via minimum on-time of 68 ns and adaptive frequency foldback.
The LMR33620BRNXR integrates a 5-V internal LDO (VCC), bootstrap gate driver (BOOT), and analog ground (AGND) with dedicated thermal pad. Protection includes cycle-by-cycle current limit, hiccup short-circuit response, thermal shutdown at 165°C, and input UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-VIN industrial rails including 12 V, 24 V, and 36 V battery/supply systems |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, FPGAs, and gate drivers in compact designs |
| Switching Frequency | 1.4 MHz - enables use of small external inductors (e.g., 1 µH) and reduces solution footprint |
| Feedback Reference Voltage | 1.0 V ±1.5% - sets output accuracy for adjustable configurations using resistor divider |
| Quiescent Current | 25 µA - maintains high efficiency at light loads without sacrificing standby performance |
| Minimum On-Time | 68 ns - enables high step-down ratios (e.g., 24 V → 3.3 V) at 1.4 MHz without pulse-skipping instability |
| Junction Temperature Range | –40°C to +125°C - rated for harsh environments including factory automation and motor drive enclosures |
Pinout & Package
The LMR33620BRNXR is housed in a 12-pin 3 mm × 2 mm VQFN package with wettable flanks and an exposed thermal pad (AGND). This package minimizes parasitic inductance, suppresses EMI, and enables automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return for high-current paths; must be connected to system ground plane with low-inductance layout |
| 2, 10 | VIN | Main input supply terminal; requires local 10-µF ceramic capacitor directly to PGND |
| 9 | EN | Enable input with precision thresholds (1.231 V typ turn-on); supports adjustable UVLO via external divider |
| 8 | PG | Open-drain power-good flag; asserts high when output is within ±3% of target, filtered by 60–170 µs glitch window |
| 7 | FB | Feedback node for output voltage regulation; connects to resistor divider tap; 1.0 V reference sets VOUT = 1.0 × (1 + RFBT/RFBB) |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry; requires 1-µF bypass capacitor to AGND |
| 4 | BOOT | Bootstrap supply for high-side MOSFET gate driver; requires 100-nF ceramic capacitor to SW |
| 12 | SW | Switch node connecting to power inductor; carries high di/dt; must be routed with minimal loop area |
| 6 | AGND | Analog ground reference for feedback and internal references; connects to thermal pad and system ground |
| 3 | NC | No internal connection; on PCB, connect SW to this pad to simplify CBOOT routing per TI layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates external Type-II/III compensation components, reducing BOM count and layout sensitivity |
| HotRod™ Package with Wettable Flanks | Enables reliable solder-joint inspection and improves thermal dissipation (RθJB = 23.3°C/W) |
| Parallel Input Current Paths | Reduces EMI by canceling magnetic fields between VIN and PGND pins on opposite sides of VQFN |
| Peak Efficiency >95% | Achieved at mid-load (e.g., 1 A @ 5 V out from 12 V in), minimizing thermal stress in enclosed systems |
| Short Minimum On-Time (68 ns) | Supports high-frequency, high-ratio conversion (e.g., 24 V → 3.3 V @ 1.4 MHz) without forced discontinuous mode |
Applications
| Motor Drive Power Supply | PLC CPU Core Supply |
|---|---|
Use Scenario: Powers MCU, encoder interface, and gate driver bias in compact drone ESC or servo drive modules. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V or 5 V rail from 12–24 V battery or bus. Use Value: 1.4 MHz switching allows <10 mm² total solution size; 25 µA quiescent current extends battery runtime during idle. | Use Scenario: Supplies 1.2 V core and 3.3 V I/O rails for industrial PLC CPUs operating in DIN-rail mounted cabinets. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with power-good monitoring for safe processor reset. Use Value: –40°C to +125°C rating ensures uptime in uncooled enclosures; hiccup-mode short-circuit protection prevents field failures. |
| HVAC Control Board | Elevator Controller Interface |
Use Scenario: Delivers regulated 5 V and 12 V outputs for sensors, relays, and communication ICs in HVAC zone controllers. IC Role / Device Role / Timing Role: Wide-input buck converter tolerant of 36 V surges on 24 V AC/DC-derived rails. Use Value: 36 V absolute max input withstands load-dump transients; integrated UVLO prevents brownout resets during line sags. | Use Scenario: Provides isolated logic supply for CAN transceivers and safety-monitoring circuits in elevator door controllers. IC Role / Device Role / Timing Role: Functional-safety-capable DC/DC with power-good flag for ASIL-B diagnostic coverage. Use Value: Documentation support for ISO 26262 system design; open-drain PG signal interfaces directly to safety MCU reset inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620BDDA | Same electrical specs but in 8-pin HSOIC (5 mm × 4 mm); higher RDS-ON (HS: 95–160 mΩ vs. 75–145 mΩ); 42.9°C/W RθJA vs. 72.5°C/W | Better thermal performance in low-airflow environments; larger footprint limits ultra-compact designs | Select when board space permits and thermal margin is prioritized over miniaturization |
| TPSM53602 | Pin-compatible module integrating LMR33620 + inductor; fixed 5 V or adjustable output; 3.5 mm × 4.5 mm footprint | Reduces design time and layout risk; eliminates external magnetics but increases height (2.5 mm vs. 0.85 mm) | Select for rapid prototyping or where layout expertise is limited; not suitable for ultra-low-profile applications |
Compared with LMR33620BDDA, the LMR33620BRNXR offers superior EMI performance and smaller footprint but requires careful thermal management due to higher RθJA; versus TPSM53602, it provides greater flexibility in output voltage and external component selection at the cost of additional design effort.
Availability
LMR33620BRNXR is available at Aetrix Electronics and suitable for motor drive systems, PLC CPU power supplies, HVAC control boards, and elevator controller interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for LMR33620BRNXR 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 experience.
The LMR33620 belongs to TI's SIMPLE SWITCHER® family-designed specifically for rugged, wide-input industrial DC/DC conversion where reliability, ease of use, and minimal external components are critical.
FAQ
What is the switching frequency of the LMR33620BRNXR?
The LMR33620BRNXR operates at a fixed 1.4 MHz switching frequency. This value is factory-configured and cannot be adjusted externally. The 1.4 MHz frequency enables compact magnetic design and helps meet conducted EMI requirements in industrial environments without requiring complex filtering. It is specified across the full –40°C to +125°C junction temperature range and remains stable under line and load variations.
Does the LMR33620BRNXR require external compensation components?
No, the LMR33620BRNXR includes an integrated compensation network. This eliminates the need for external Type-II or Type-III compensation networks, reducing bill-of-materials count and layout sensitivity. The internal compensation is optimized for stability with standard output capacitor ESR values and typical inductor selections used in 1.4 MHz operation, simplifying design validation for industrial applications.
What package type is used for the LMR33620BRNXR?
The LMR33620BRNXR uses a 12-pin VQFN package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks. This HotRod™-based package features symmetrical VIN/PGND pin placement to reduce EMI, an exposed thermal pad (AGND), and optimized power delivery paths. It is distinct from the HSOIC variant and requires reflow-compatible PCB land patterns per TI's SNOA870 layout guidelines.
How does the power-good (PG) function work on the LMR33620BRNXR?
The LMR33620BRNXR provides an open-drain power-good flag (PG pin) that asserts high when the output voltage is within ±3% of regulation (93–107% of FB reference). It includes a 60–170 µs glitch filter to ignore transient excursions and pulls low during startup, fault conditions, or when EN is deasserted. The PG pin requires an external pull-up resistor (e.g., 100 kΩ to VOUT or VCC) and interfaces directly with microcontroller reset inputs.
What protection features are built into the LMR33620BRNXR?
The LMR33620BRNXR includes cycle-by-cycle current limiting, hiccup-mode short-circuit protection, thermal shutdown at 165°C (with 148°C hysteresis), input undervoltage lockout, and bootstrap UVLO. These protections operate independently of external components and are fully characterized across temperature. No external fault-handling circuitry is required for basic robustness in industrial deployments.
LMR33620BRNXR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 12-PowerVFQFN
- 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:
- 2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33620BRNXR FAQ
1.How can I place an order for LMR33620BRNXR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620BRNXR 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 LMR33620BRNXR reliable?
The price and inventory of LMR33620BRNXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620BRNXR is usually 5 days.
3.What payment methods are accepted for LMR33620BRNXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620BRNXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620BRNXR?
LMR33620BRNXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620BRNXR 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 LMR33620BRNXR?
For technical support, including LMR33620BRNXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620BRNXR requirements.
6.How does Aetrix verify that LMR33620BRNXR is sourced from the original manufacturer or authorized distributors?
All LMR33620BRNXR 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 LMR33620BRNXR meets industry standards.
7.What is the process for return or replacement of LMR33620BRNXR?
All LMR33620BRNXR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620BRNXR, 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 LMR33620BRNXR part is unused and in its original packaging.
Return procedure for LMR33620BRNXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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