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Texas Instruments LMR36015SBRNXR
- Part No.:
- LMR36015SBRNXR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR36015SBRNXR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
LMR36015SBRNXR from Texas Instruments is a synchronous step-down DC/DC converter delivering 1.5 A output current across 4.2 V to 60 V input, featuring 1-MHz fixed-frequency operation, –55°C to +150°C junction temperature rating, and integrated high-side/low-side MOSFETs in a 2-mm × 3-mm HotRod™ VQFN-HR package. It serves as a rugged primary or intermediate power rail in industrial field transmitters, PLC modules, and HVAC controllers.
For engineers reviewing the LMR36015SBRNXR datasheet, LMR36015SBRNXR pinout, LMR36015SBRNXR application, or LMR36015SBRNXR equivalent, key selection criteria include its 1-MHz switching frequency, FPWM-disabled configuration (per orderable variant), 26 µA quiescent current, CISPR25 Class 5 EMI compliance, and validated –55°C cold-start capability for aerospace and transport electronics.
Technical Context
The LMR36015SBRNXR uses peak-current-mode control with internal loop compensation and operates exclusively in forced PWM (FPWM disabled) mode-confirmed by its orderable part number suffix "BRNXR" in TI's device comparison table. Its 1-MHz oscillator frequency is factory-trimmed (±15% over temperature), and it integrates 435-mΩ high-side and 280-mΩ low-side MOSFETs enabling 0.4-V dropout at 1.5-A load.
It features precision enable thresholds (VEN-VOUT-H = 1.231 V typ.), a filtered open-drain power-good flag with 140-µs deglitch delay, and thermal shutdown at 170°C with 12°C hysteresis. Input transient tolerance up to 66 V and –55°C operational rating are validated in absolute maximum and recommended operating conditions tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 60 V - supports wide industrial input rails including 24-V and 48-V systems with 66-V surge tolerance. |
| Output Current | 1.5 A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in space-constrained modules. |
| Switching Frequency | 1 MHz ±15% - enables compact magnetics and fast transient response; fixed-frequency operation eliminates PFM frequency variation. |
| Quiescent Current | 26 µA typ. - minimizes standby power loss in battery-backed or energy-harvested field devices. |
| Junction Temperature | –55°C to +150°C - qualified for extreme environments including aerospace, rail, and outdoor industrial enclosures. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive and industrial radiated emissions limits without added filtering. |
| Package | VQFN-HR (RNX), 2.0 mm × 3.0 mm - HotRod™ flip-chip construction reduces switch-node ringing and parasitic inductance. |
Pinout & Package
VQFN-HR (RNX) 12-pin thermally enhanced package, 2.00 mm × 3.00 mm body size, exposed thermal pad on underside for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Low-inductance return path for high-current switching; must be connected directly to AGND and CIN ground plane with wide copper. |
| 2, 10 VIN | Main input supply | Accepts 4.2–60 V; withstands 66-V transients; requires low-ESR input capacitor placed adjacent to pins 2/10. |
| 3 NC | No connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing per TI layout guidance. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor between BOOT and SW pins. |
| 5 VCC | Internal 5-V LDO output | Powers internal logic; not for external loads; requires 1-µF decoupling to AGND. |
| 6 AGND | Analog ground reference | Ground for FB, EN, PG; must be star-connected to PGND near IC to avoid noise coupling into feedback path. |
| 7 FB | Feedback input | Monitors output via resistor divider; 1.0-V reference enables precise adjustable VOUT; leakage <0.2 nA ensures accuracy. |
| 8 PG | Open-drain power-good flag | Signals VOUT regulation status; 140-µs deglitch prevents false trips during transients; requires external pull-up. |
| 9 EN | Enable control | Logic-level input with 1.231-V turn-on threshold; supports direct VIN connection or precision UVLO via resistor divider. |
| 12 SW | Switch node | Connects to power inductor; high di/dt node requiring minimal trace length and tight loop with PGND and CIN. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN-HR package | Eliminates bond wires to reduce parasitic inductance, suppress switch-node ringing, and improve EMI performance. |
| 1-MHz fixed-frequency operation | Ensures predictable EMI spectrum and simplifies filter design; avoids audible noise and enables smaller LC components. |
| –55°C to +150°C junction rating | Validated for deployment in unheated outdoor equipment, avionics bays, and engine-mounted industrial sensors. |
| CISPR25 Class 5 compliance | Meets automotive-grade radiated emissions limits without external snubbers or shielding-reducing BOM cost and board area. |
| Integrated power-good flag | Provides system-level fault detection with built-in deglitching and voltage thresholds tied to FB reference for accurate monitoring. |
| Input transient protection to 66 V | Reduces need for upstream TVS or clamping circuits in 24-V/48-V systems subject to IEC 61000-4-5 surge events. |
Applications
| Field Transmitter Power | PLC Module Rail |
|---|---|
Use Scenario: Powering 4–20 mA loop-powered field transmitters in hazardous process plants with ambient temperatures down to –40°C. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V buck regulator supplying MCU, ADC, and signal conditioning circuitry. Use Value: –55°C start-up capability ensures reliable cold-weather commissioning; 60-V input range accommodates long cable drops and surges. |
Use Scenario: Generating isolated 5-V or 12-V auxiliary rails inside modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Intermediate point-of-load converter stepping down 24-V system bus to logic rails. Use Value: 1-MHz switching enables compact 2.2-µH inductors; CISPR25 Class 5 compliance avoids interference with analog I/O modules. |
| HVAC Sensor Node | Aerospace Remote I/O |
Use Scenario: Powering wireless temperature/humidity sensor nodes mounted behind HVAC ductwork where ambient exceeds 85°C. IC Role / Device Role / Timing Role: Main DC/DC regulator converting 12–48 V HVAC supply to stable 3.3-V for RF SoC and sensing ICs. Use Value: +150°C junction rating allows full 1.5-A output derating at 105°C board temperature; low 26-µA IQ extends battery life in sleep mode. |
Use Scenario: Providing regulated power to remote data acquisition units on aircraft wings or fuselage sections exposed to –55°C flight conditions. IC Role / Device Role / Timing Role: Cold-tolerant secondary power stage converting 28-V aircraft bus to 5-V for FPGA and interface ICs. Use Value: Validated –55°C operation eliminates pre-heating requirements; 66-V transient tolerance handles load dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36015SFBRNXR | Same silicon, but factory-configured for forced PWM (FPWM enabled); 1-MHz operation retained. | Required where constant-frequency operation is mandatory under all load conditions-including light loads. | Select LMR36015SFBRNXR only if diode emulation must be disabled to meet timing-critical or EMI spectral mask constraints. |
| LMR36006SARNXR | 60-V, 0.6-A variant; pin-compatible but lower current rating and 400-kHz default frequency. | Suitable for ultra-low-power sensor nodes where <600 mA output suffices and larger inductors are acceptable. | Choose LMR36006SARNXR when system load is ≤0.6 A and 400-kHz switching better matches EMI or efficiency targets at light loads. |
Compared with LMR36015SFBRNXR, the LMR36015SBRNXR offers higher light-load efficiency via PFM mode but sacrifices strict frequency stability; versus LMR36006SARNXR, it delivers 2.5× more output current in identical footprint while maintaining the same thermal and environmental robustness.
Availability
LMR36015SBRNXR is available at Aetrix Electronics and suitable for industrial automation, aerospace subsystems, and building management systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR36015SBRNXR 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 LMR36015SBRNXR belongs to TI's LMR360x5S scalable buck converter family, engineered for ruggedized industrial power supplies where wide input range, extreme temperature operation, and low EMI are non-negotiable design requirements.
FAQ
What is the switching frequency of the LMR36015SBRNXR?
The LMR36015SBRNXR operates at a fixed 1-MHz switching frequency, as confirmed by TI's device comparison table and electrical characteristics section. This frequency is factory-trimmed with ±15% tolerance over temperature and load. Unlike PFM-capable variants, LMR36015SBRNXR does not shift frequency at light loads-ensuring predictable EMI behavior and simplified filter design in noise-sensitive applications.
Does the LMR36015SBRNXR support operation at –55°C?
Yes, the LMR36015SBRNXR is fully specified and tested for operation from –55°C to +150°C junction temperature, as stated in both absolute maximum ratings and recommended operating conditions. This qualification enables use in aerospace, rail, and outdoor industrial equipment where cold-soak start-up is required. The device maintains 1.5-A output capability down to –40°C ambient, with appropriate derating per thermal metrics.
What is the purpose of the NC pin on the LMR36015SBRNXR?
Pin 3 on the LMR36015SBRNXR is designated NC (no connect) and has no internal connection. TI recommends connecting the SW pin to this NC pad on the PCB to simplify routing of the CBOOT capacitor from BOOT to SW-a layout technique that minimizes loop inductance and improves EMI performance. This mechanical routing aid does not affect electrical functionality.
How does the power-good (PG) flag behave during startup of the LMR36015SBRNXR?
The LMR36015SBRNXR's open-drain PG flag asserts high after a typical 4-ms delay following EN assertion, once output voltage reaches 105% of the FB reference (1.05 V). It remains high while VOUT stays within 93–107% of regulation. During startup, PG is held low until soft-start completes and regulation is achieved-providing clean system reset signaling without false triggers from output overshoot or transient excursions.
Is the LMR36015SBRNXR pin-compatible with other devices in the LMR360x5S family?
Yes, the LMR36015SBRNXR shares the same 12-pin VQFN-HR (RNX) package and pinout with LMR36015SFBRNXR and LMR36006SARNXR, enabling drop-in replacement within the family. This allows scalable power design: LMR36006SARNXR (0.6 A) and LMR36015SBRNXR (1.5 A) share identical footprints and layout, simplifying BOM rationalization and reducing redesign effort when upgrading output current.
LMR36015SBRNXR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 4.2V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR36015SBRNXR FAQ
1.How can I place an order for LMR36015SBRNXR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36015SBRNXR 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 LMR36015SBRNXR reliable?
The price and inventory of LMR36015SBRNXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36015SBRNXR is usually 5 days.
3.What payment methods are accepted for LMR36015SBRNXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36015SBRNXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36015SBRNXR?
LMR36015SBRNXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36015SBRNXR 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 LMR36015SBRNXR?
For technical support, including LMR36015SBRNXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36015SBRNXR requirements.
6.How does Aetrix verify that LMR36015SBRNXR is sourced from the original manufacturer or authorized distributors?
All LMR36015SBRNXR 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 LMR36015SBRNXR meets industry standards.
7.What is the process for return or replacement of LMR36015SBRNXR?
All LMR36015SBRNXR units undergo pre-shipment inspection (PSI). If there is an issue with LMR36015SBRNXR, 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 LMR36015SBRNXR part is unused and in its original packaging.
Return procedure for LMR36015SBRNXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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