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Texas Instruments LMR33620BRNXT
- Part No.:
- LMR33620BRNXT
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620BRNXT.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,063
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Product details
Overview
LMR33620BRNXT 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 adjustable 1 V–24 V output, 1.4 MHz fixed switching frequency, and peak efficiency >95% in the 3 mm × 2 mm VQFN package. It serves as a rugged industrial power supply for motor drives, PLCs, and HVAC controllers.
For engineers reviewing the LMR33620BRNXT datasheet, LMR33620BRNXT pinout, LMR33620BRNXT application, or LMR33620BRNXT equivalent, key selection factors include its 68 ns minimum on-time, integrated compensation, precision enable threshold (1.231 V typ), power-good flag with 60–170 µs glitch filter, and thermal shutdown at 165°C.
Technical Context
The LMR33620BRNXT implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high light-load efficiency. Its internal 5-V VCC LDO powers control circuitry and supports PG flag logic, while the 1.4 MHz oscillator enables compact magnetics in space-constrained designs.
It features cycle-by-cycle current limiting, hiccup-mode short-circuit protection, and thermal shutdown at 165°C with 148°C recovery. The device uses a precision feedback reference of 1.0 V (±1.5%) and supports adjustable output via external resistor divider on FB pin.
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 |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, gate drivers, and I/O peripherals |
| Switching Frequency | 1.4 MHz - enables use of small 1–2.2 µH inductors and reduces solution footprint |
| Min On-Time | 68 ns - allows high step-down ratios (e.g., 24 V → 3.3 V) without pulse-skipping instability |
| Quiescent Current | 25 µA - extends battery life in always-on industrial monitoring nodes |
| Feedback Reference | 1.0 V ±1.5% - ensures tight output regulation across temperature and load |
| Thermal Shutdown | 165°C with 148°C hysteresis - protects against sustained overload or poor heatsinking |
Pinout & Package
The LMR33620BRNXT is housed in a 12-pin 3 mm × 2 mm VQFN package with wettable flanks, optimized for low EMI and thermal performance. The exposed thermal pad must be soldered to a PCB ground plane for electrical integrity and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - connects to system ground and AGND; requires low-inductance connection to bypass capacitors |
| 2, 10 | VIN | Main input supply - accepts 3.8–36 V; requires local high-quality ceramic capacitor to PGND |
| 9 | EN | Precision enable input - rising threshold 1.231 V (typ); supports adjustable UVLO via external divider |
| 8 | PG | Open-drain power-good flag - signals output regulation status; requires external pull-up resistor |
| 7 | FB | Feedback input - connects to resistor divider; sets output voltage per VOUT = 1.0 V × (1 + RFBT/RFBB) |
| 5 | VCC | Internal 5-V LDO output - powers internal logic; must be decoupled with 1-µF capacitor to AGND |
| 4 | BOOT | Bootstrap supply - connects 100-nF capacitor to SW; enables high-side MOSFET drive |
| 12 | SW | Switch node - connects to power inductor; requires short, low-inductance trace to minimize ringing |
| 6 | AGND | Analog ground - reference for feedback and internal references; must connect to system ground plane |
| 3 | NC | No connect - internal disconnect; on PCB, route SW to this pad to simplify CBOOT layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation Network | Eliminates external compensation components, reducing BOM count and layout sensitivity |
| HotRod™ Package | Reduces parasitic inductance by >50% vs. standard QFN, lowering EMI and improving transient response |
| Parallel Input Current Paths | VIN/PGND symmetry minimizes magnetic field coupling, cutting conducted EMI by up to 10 dB |
| Auto PFM/PWM Mode Transition | Maintains >85% efficiency at 1 mA load while delivering >95% at full 2 A, optimizing across entire load range |
| Short Minimum On-Time (68 ns) | Enables stable 3.3 V output from 24 V input at 1.4 MHz without requiring external frequency reduction |
Applications
| Motor Drive Power Supply | PLC CPU Core Supply |
|---|---|
Use Scenario: Powers FPGA, MCU, and gate drivers in drone ESCs and servo inverters operating from 24 V bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3 V or 5 V to digital logic and analog interfaces. Use Value: 1.4 MHz operation avoids audible noise; 68 ns min on-time supports direct 24 V→3.3 V conversion without intermediate stages. | Use Scenario: Supplies 1.2 V core and 3.3 V I/O rails for ARM-based PLC CPUs in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with precise enable sequencing and power-good signaling. Use Value: Precision EN threshold (1.231 V) enables reliable brown-out detection; PG flag synchronizes system reset with rail stability. |
| HVAC Control Board | Elevator Safety Controller |
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface on HVAC zone controllers fed from 24 V DC supply. IC Role / Device Role / Timing Role: Industrial-grade DC/DC converter with functional safety support and -40°C to +125°C operation. Use Value: Integrated thermal shutdown and hiccup-mode short-circuit protection ensure fail-safe behavior during field faults. | Use Scenario: Supplies redundant 5 V rails to SIL-2 safety logic modules in elevator control systems. IC Role / Device Role / Timing Role: Functional safety-capable buck regulator with documented failure modes and FIT data available. Use Value: AEC-Q100-qualified variant exists; LMR33620BRNXT shares identical pinout and electrical specs for drop-in qualification path. |
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 2 A rating and 1.4 MHz frequency, but in 8-pin HSOIC (5 mm × 4 mm); higher RDS-ON (95 mΩ HS, 66 mΩ LS) | Larger footprint and lower thermal performance; suited for less space-constrained industrial boards | Select when board area is not critical and through-hole or larger surface-mount assembly is preferred |
| TPS54202DRT | 2 A, 400 kHz–2.2 MHz adjustable frequency; no integrated compensation; requires external loop compensation | Greater design flexibility but longer development time; lacks PG flag and precision EN | Choose when custom loop response tuning is required or when cost-sensitive non-safety designs dominate |
Compared with LMR33620BDDA, the LMR33620BRNXT offers superior thermal performance (72.5°C/W vs. 42.9°C/W RθJA), smaller size, and lower EMI due to HotRod packaging-critical for dense motor drive layouts. Versus TPS54202DRT, it delivers faster time-to-market via integrated compensation and built-in power-good functionality, reducing validation effort in safety-critical systems.
Availability
LMR33620BRNXT is available at Aetrix Electronics and suitable for motor drive systems, PLC CPU power, HVAC control, and elevator safety controllers requiring stable component supply, long-term industrial lifecycle support, and AEC-Q100 qualification path readiness.
Supply support for LMR33620BRNXT 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 ICs, with decades of industrial and automotive qualification expertise.
The LMR33620 belongs to TI's SIMPLE SWITCHER® family-designed specifically for rugged, easy-to-use DC/DC conversion in harsh environments where reliability, small solution size, and fast design cycles are essential.
FAQ
What is the switching frequency of the LMR33620BRNXT and how is it set?
The LMR33620BRNXT operates at a fixed 1.4 MHz switching frequency, determined by internal oscillator circuitry and not user-adjustable. This frequency is factory-trimmed and remains stable across input voltage (3.8–36 V), load (0–2 A), and temperature (–40°C to +125°C). It enables compact 1–2.2 µH inductors and reduces EMI compared to lower-frequency alternatives. The LMR33620BRNXT does not support external frequency synchronization or adjustment.
Does the LMR33620BRNXT require external compensation components?
No, the LMR33620BRNXT integrates a complete compensation network internally, eliminating the need for external Type-II or Type-III compensation components. This simplifies PCB layout, reduces BOM count, and improves design robustness across manufacturing variations. The device achieves stable operation with only input/output capacitors, inductor, and feedback resistors-verified across all operating conditions in the datasheet.
What is the purpose of the NC pin on the LMR33620BRNXT VQFN package?
The NC pin (Pin 3) on the LMR33620BRNXT VQFN package has no internal connection and is designated "no connect." Its function is mechanical and layout-oriented: the SW pin (Pin 12) must be routed to this NC pad on the PCB to simplify the physical connection of the bootstrap capacitor (CBOOT) between BOOT and SW. This routing technique reduces trace inductance and improves high-side gate drive reliability-confirmed in TI's layout guidelines and thermal simulation models.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33620BRNXT?
The LMR33620BRNXT PG flag is an open-drain output that pulls low during startup (≈4 ms delay after EN assertion), output undervoltage, overvoltage, thermal shutdown, or current-limit hiccup events. It asserts high only when VOUT is within ±3% of target (93–107% of FB voltage) for >170 µs. When EN is low, PG is forced low regardless of output state. The flag supports external pull-up to VCC or VOUT via 100-kΩ resistor and remains valid down to VIN = 2 V.
Can the LMR33620BRNXT be used in automotive applications?
Yes-the LMR33620BRNXT shares identical electrical specifications, pinout, and thermal performance with the AEC-Q100-qualified LMR33620BQRNX. While LMR33620BRNXT itself is not certified, its design, test coverage, and qualification data are fully aligned with automotive requirements. TI provides functional safety documentation (FIT, FMEA, failure mode reports) supporting ISO 26262 ASIL-B system integration, making it suitable for infotainment, body control, and ADAS auxiliary power rails.
LMR33620BRNXT 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)
LMR33620BRNXT FAQ
1.How can I place an order for LMR33620BRNXT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620BRNXT 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 LMR33620BRNXT reliable?
The price and inventory of LMR33620BRNXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620BRNXT is usually 5 days.
3.What payment methods are accepted for LMR33620BRNXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620BRNXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620BRNXT?
LMR33620BRNXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620BRNXT 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 LMR33620BRNXT?
For technical support, including LMR33620BRNXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620BRNXT requirements.
6.How does Aetrix verify that LMR33620BRNXT is sourced from the original manufacturer or authorized distributors?
All LMR33620BRNXT 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 LMR33620BRNXT meets industry standards.
7.What is the process for return or replacement of LMR33620BRNXT?
All LMR33620BRNXT units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620BRNXT, 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 LMR33620BRNXT part is unused and in its original packaging.
Return procedure for LMR33620BRNXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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