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Texas Instruments LMR33620ARNXR
- Part No.:
- LMR33620ARNXR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620ARNXR.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
LMR33620ARNXR from Texas Instruments is a synchronous step-down DC/DC converter delivering 2 A output current across 3.8 V to 36 V input, supporting adjustable 1 V to 24 V output with 400 kHz fixed switching frequency in a 12-pin VQFN (3 mm × 2 mm) package. It integrates peak-current-mode control, 68 ns minimum on-time, and power-good flag for industrial motor drives and automation systems.
For engineers reviewing the LMR33620ARNXR datasheet, LMR33620ARNXR pinout, LMR33620ARNXR application, or LMR33620ARNXR equivalent, key selection considerations include its rugged 125°C junction temperature rating, low 25 µA quiescent current, integrated compensation, HotRod™ VQFN package with wettable flanks, and precision enable thresholds enabling programmable UVLO.
Technical Context
The LMR33620ARNXR implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. Its 68 ns minimum on-time enables high VIN-to-VOUT step-down ratios (e.g., 36 V → 3.3 V at 2.1 MHz), while valley current limit and hiccup-mode short-circuit protection ensure robustness under sustained overload.
It features an internal 5-V LDO (VCC pin), open-drain power-good flag with 60–170 µs glitch filter, and precision enable thresholds (1.231 V typical turn-on, 100 mV hysteresis). The VQFN package uses symmetrical VIN/PGND layout and parallel current paths to minimize EMI and switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide-input industrial rails including 24 V and 36 V battery/supply systems |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, and gate drivers in compact designs |
| Switching Frequency | 400 kHz - balances efficiency, size, and EMI; fixed-frequency PWM operation avoids audible noise |
| Quiescent Current | 25 µA - enables ultra-low-power standby in always-on industrial monitoring nodes |
| Min On-Time | 68 ns - allows high step-down ratio operation (e.g., 36 V → 3.3 V) without pulse-skipping instability |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including motor drive enclosures and factory PLCs |
| Feedback Reference | 1.0 V ±1.5% - enables precise output regulation with minimal drift over temperature and line |
Pinout & Package
The LMR33620ARNXR is housed in a 12-pin VQFN package (3.00 mm × 2.00 mm × 0.85 mm) with wettable flanks and exposed thermal pad. This HotRod™ package minimizes parasitic inductance, reduces EMI, and improves thermal performance via direct PCB copper connection to the thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground plane and AGND with low-inductance traces; serves as primary return path for high di/dt currents |
| 2, 10 | VIN | Main input supply - requires local high-quality bypass capacitor directly between VIN and PGND to suppress ripple and transients |
| 9 | EN | Enable input - precision threshold (1.231 V typ) allows programmable input UVLO using external resistor divider; must not float |
| 8 | PG | Open-drain power-good flag - signals output regulation status; requires external pull-up resistor; asserts low during fault or startup |
| 7 | FB | Feedback input - connects to voltage divider tap; regulates output by maintaining 1.0 V at this pin; high-impedance (≤50 nA leakage) |
| 5 | VCC | Internal 5-V LDO output - powers internal circuitry; must be decoupled with 1-µF ceramic capacitor to AGND; not for external loads |
| 4 | BOOT | Bootstrap supply - connects via 100-nF capacitor to SW; supplies gate drive for high-side MOSFET; critical for proper high-side conduction |
| 12 | SW | Switch node - connects to power inductor; carries high di/dt; requires short, wide trace and tight loop with PGND and CIN |
| 6 | AGND | Analog ground - reference for feedback, references, and logic; must connect to system ground plane; separate from PGND at single point |
| 3 | NC | No connect - internal disconnect; on PCB, connect SW pin to this NC pad to simplify CBOOT routing per TI layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates need for external Type II/III compensation components, reducing BOM count and layout sensitivity |
| HotRod™ VQFN with Wettable Flanks | Enables automated optical solder inspection (AOI) and improves thermal dissipation (RθJB = 23.3°C/W) and EMI performance |
| Peak-Current-Mode Control | Provides inherent cycle-by-cycle current limiting, fast transient response, and stable operation across wide input/output ranges |
| Power-Good Flag with Glitch Filter | 60–170 µs digital filter prevents false resets during brief load transients; supports reliable system sequencing and fault detection |
| Low Quiescent Current (25 µA) | Extends battery life in always-on industrial sensors and enables efficient operation in energy-constrained edge nodes |
Applications
| Motor Drive Power Supply | PLC CPU Core Supply |
|---|---|
Use Scenario: Providing clean, regulated 3.3 V or 5 V to MCU, FPGA, and gate driver ICs in drone ESCs and servo amplifiers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V bus to logic-level rail; delivers 2 A with <±1.5% regulation over temperature and load. Use Value: 68 ns min on-time enables stable 24 V → 3.3 V conversion at 400 kHz, avoiding pulse-skipping artifacts that disrupt timing-critical gate drive signals. | Use Scenario: Powering ARM Cortex-M7-based PLC CPUs requiring tight tolerance, low noise, and thermal resilience in cabinet-mounted controllers. IC Role / Device Role / Timing Role: Main system rail regulator; integrates soft-start (4 ms typical) and power-good flag for safe boot sequencing and brownout recovery. Use Value: 125°C junction rating and integrated thermal shutdown allow continuous operation in unventilated control cabinets up to 85°C ambient. |
| HVAC Zone Controller | Industrial IoT Sensor Node |
Use Scenario: Generating 5 V from 24 V HVAC field bus to power microcontroller, RS-485 transceiver, and analog front-end. IC Role / Device Role / Timing Role: Wide-VIN step-down converter with precision enable enabling wake-on-event functionality via external sensor interrupt. Use Value: 25 µA quiescent current and 100 mV EN hysteresis support ultra-low-power sleep modes while retaining fast, deterministic wake-up response. | Use Scenario: Powering LoRaWAN or NB-IoT edge nodes deployed in remote locations with 12–36 V solar/battery inputs. IC Role / Device Role / Timing Role: Primary power management IC; operates in PFM at light load to sustain >85% efficiency down to 1 mA output current. Use Value: Automatic PFM/PWM transition and integrated compensation reduce solution size and extend battery life beyond 5 years in maintenance-free deployments. |
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 | 8-pin HSOIC package (5 mm × 4 mm); 1.4 MHz switching frequency; higher RDS-ON (HS: 95–160 mΩ) | Better suited for space-tolerant, lower-EMI designs where board area is less constrained and higher frequency enables smaller inductors | Select when thermal performance requirements are less stringent and PCB layout favors through-hole-compatible footprint |
| TPSM53602 | Complete 2-A module with integrated inductor; larger footprint (7.5 mm × 6.5 mm); same 400 kHz option; higher cost | Reduces design time and validation effort for rapid prototyping or low-volume production where layout expertise is limited | Choose when minimizing engineering risk and time-to-market outweighs bill-of-materials and board-area optimization goals |
Compared with LMR33620BDDA, the LMR33620ARNXR offers superior thermal performance (RθJB = 23.3°C/W vs. 13.6°C/W), smaller footprint, and lower EMI due to HotRod™ layout-making it preferred for dense, thermally challenged industrial PCBs. Versus TPSM53602, it provides greater design flexibility, lower system cost, and tighter size constraints, though requiring external magnetics and compensation tuning.
Availability
LMR33620ARNXR is available at Aetrix Electronics and suitable for motor drive systems, PLC CPU power, HVAC control units, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified reliability assurance.
Supply support for LMR33620ARNXR 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 LMR33620ARNXR belongs to TI's SIMPLE SWITCHER® family-designed specifically for rugged, wide-input industrial power conversion where reliability, thermal resilience, and ease of use are critical.
FAQ
What is the maximum output voltage supported by the LMR33620ARNXR?
The LMR33620ARNXR supports an adjustable output voltage range from 1 V to 24 V. This is achieved via external resistor divider on the FB pin, referenced to its internal 1.0 V ±1.5% bandgap. The maximum output is also limited to 95% of VIN under certain conditions; for outputs above 24 V or near VIN, consult TI's application guidance or contact technical support for feasibility assessment of the LMR33620ARNXR.
Does the LMR33620ARNXR require external compensation components?
No, the LMR33620ARNXR integrates a complete compensation network internally. This eliminates the need for external Type II or Type III compensation networks, simplifying design, reducing BOM count, and improving immunity to layout-induced instability. Designers only need to select appropriate output capacitors and inductors per the recommended values in the datasheet for the LMR33620ARNXR.
What is the purpose of the NC pin on the LMR33620ARNXR VQFN package?
The NC (No Connect) pin on the LMR33620ARNXR's 12-pin VQFN package is a dedicated PCB pad intended to receive the SW node connection. Per TI's layout guidance, the SW pin (pin 12) must be routed to this NC pad on the PCB to simplify the CBOOT capacitor placement-ensuring a low-inductance path between BOOT and SW. This NC pad has no internal silicon connection and serves solely as a routing aid for optimal high-frequency performance of the LMR33620ARNXR.
How does the LMR33620ARNXR handle short-circuit conditions?
The LMR33620ARNXR employs dual protection: cycle-by-cycle peak current limiting for momentary overloads and hiccup-mode short-circuit protection for sustained faults. When output short occurs, it enters hiccup mode-shutting down for ~94 ms (typical), then attempting restart. This limits average power dissipation and prevents thermal runaway. The LMR33620ARNXR also includes thermal shutdown (165°C trip, 148°C recovery) and input UVLO for comprehensive fault coverage.
Can the LMR33620ARNXR be used in automotive applications?
The LMR33620ARNXR itself is not AEC-Q100 qualified; however, a pin-compatible AEC-Q100-qualified version (LMR33620QRNXR) is available from Texas Instruments. For automotive-grade deployment, designers must specify the Q-grade variant. The LMR33620ARNXR is optimized for industrial applications-including factory automation and motor drives-but lacks the extended temperature screening, failure-in-time (FIT) reporting, and qualification documentation required for automotive safety-critical systems.
LMR33620ARNXR 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:
- 400kHz
- 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)
LMR33620ARNXR FAQ
1.How can I place an order for LMR33620ARNXR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620ARNXR 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 LMR33620ARNXR reliable?
The price and inventory of LMR33620ARNXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620ARNXR is usually 5 days.
3.What payment methods are accepted for LMR33620ARNXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620ARNXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620ARNXR?
LMR33620ARNXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620ARNXR 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 LMR33620ARNXR?
For technical support, including LMR33620ARNXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620ARNXR requirements.
6.How does Aetrix verify that LMR33620ARNXR is sourced from the original manufacturer or authorized distributors?
All LMR33620ARNXR 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 LMR33620ARNXR meets industry standards.
7.What is the process for return or replacement of LMR33620ARNXR?
All LMR33620ARNXR units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620ARNXR, 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 LMR33620ARNXR part is unused and in its original packaging.
Return procedure for LMR33620ARNXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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