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Texas Instruments LMR36015ARNXT
- Part No.:
- LMR36015ARNXT
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR36015ARNXT.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,454
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Product details
Overview
LMR36015ARNXT from Texas Instruments is a 4.2-V to 60-V, 1.5-A synchronous step-down DC/DC converter in a 2-mm × 3-mm HotRod™ VQFN-HR package. It delivers regulated output with adjustable voltage, peak-current-mode control, and integrated high-side/low-side MOSFETs. Designed for industrial field transmitters and PLC modules, it withstands 66-V input transients and operates from –40°C to +150°C junction temperature.
For engineers reviewing the LMR36015ARNXT datasheet, LMR36015ARNXT pinout, LMR36015ARNXT application, or LMR36015ARNXT equivalent, key selection considerations include its 400-kHz fixed-frequency operation, 26-µA quiescent current in PFM mode, 0.4-V dropout at 1.5-A load, and CISPR25 Class 5 EMI compliance - all critical for space-constrained, rugged industrial power rails.
Technical Context
The LMR36015ARNXT uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode operation transitions between PWM (fixed 400 kHz) and PFM at light loads to maintain high efficiency across the full 0–1.5-A output range.
It integrates a precision enable input with hysteresis (VEN-H = 1.231 V, VEN-HYS = 110 mV), a filtered open-drain power-good flag (TPG = 80–200 µs delay), and thermal shutdown (TSD = 170°C shutdown / 158°C recovery). Input transient tolerance up to 66 V and –40°C to +150°C junction rating support IEC 61000-4-5 surge immunity in harsh environments.
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 transient tolerance. |
| Output Current | 1.5 A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in compact modules. |
| Switching Frequency | 400 kHz (fixed) - balances EMI performance and inductor size; avoids AM radio band while enabling small magnetics. |
| Quiescent Current | 26 µA (typical, non-switching) - enables >10-year battery life in always-on sensor nodes with low standby power. |
| Feedback Reference | 1.0 V ±15 mV - enables precise output regulation; supports adjustable outputs from 0.985 V to 12 V using external resistor divider. |
| Thermal Rating | Junction temperature: –40°C to +150°C - ensures reliable operation in sealed enclosures or high-ambient industrial settings. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive/industrial radiated emissions limits without added shielding or filtering. |
Pinout & Package
VQFN-HR (RNX) 12-pin package, 2.00 mm × 3.00 mm body size, exposed thermal pad. Optimized for minimal parasitic inductance and ultra-low EMI via HotRod™ flip-chip construction and parallel input paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Primary return path for high-current switching; must be connected to AGND and CIN with short, wide PCB traces to minimize noise coupling. |
| 2, 10 VIN | Main input supply | Accepts 4.2–60 V input; rated for 66-V transients; requires local 10-µF ceramic input capacitor placed adjacent to pins. |
| 3 NC | No-connect | Internally unconnected; used on PCB to simplify routing of CBOOT capacitor to SW node. |
| 4 BOOT | Bootstrap supply | Supplies gate drive for high-side MOSFET; requires 100-nF X7R ceramic capacitor directly to SW pin. |
| 5 VCC | Internal 5-V LDO output | Powers internal control circuitry; not for external loading; requires 1-µF decoupling to AGND. |
| 6 AGND | Analog ground reference | Ground reference for FB, PG, EN, and internal references; must be star-connected to PGND under IC. |
| 7 FB | Feedback input | Monitors output via resistor divider; 1.0-V reference enables accurate adjustable output; must not be floated or shorted. |
| 8 PG | Open-drain power-good | Asserts high when VOUT is within ±7% of target; includes 80–200 µs glitch filter; requires external pull-up resistor. |
| 9 EN | Enable input | Logic-level control with precision thresholds (VEN-H = 1.231 V); supports direct VIN connection or UVLO configuration via divider. |
| 12 SW | Switch node | Connects to power inductor; carries high di/dt; must be routed with minimal loop area to reduce EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ VQFN-HR package | 2 mm × 3 mm footprint with flip-chip interconnects reduces parasitic inductance by >50%, minimizing switch-node ringing and radiated EMI. |
| Integrated high/low-side MOSFETs | Eliminates external FETs and drivers; RDS(on)-HS = 435 mΩ (max), RDS(on)-LS = 280 mΩ (max) enable efficient 1.5-A conversion without layout complexity. |
| Auto PFM/PWM mode transition | Maintains >90% efficiency at 1-A load (24 VIN/5 VOUT) and extends light-load efficiency via diode-emulation PFM, reducing IQ to 26 µA. |
| Robust protection suite | Includes hiccup-mode short-circuit response (94-ms off-time), thermal shutdown (170°C), input overvoltage clamp (66 V), and precision enable with hysteresis. |
| CISPR25 Class 5 compliance | Achieved via spread-spectrum modulation, parallel input paths, and optimized HotRod™ layout - eliminates need for external EMI filters in most designs. |
Applications
| Field Transmitters & Sensors | PLC Modules |
|---|---|
Use Scenario: Powering 4–20 mA loop-powered smart sensors in hazardous or remote locations with limited board space and wide input voltage variation. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering stable 3.3 V or 5 V from 12–48 V loop supply; handles 66-V surges per IEC 61000-4-5. Use Value: 2-mm × 3-mm solution size fits inside miniature transmitter housings; 26-µA quiescent current preserves loop margin; 150°C junction rating supports operation in hot enclosures. | Use Scenario: Providing isolated auxiliary power for digital I/O, communication interfaces (RS-485, CAN), and microcontroller cores in modular PLC backplanes. IC Role / Device Role / Timing Role: Compact, rugged point-of-load converter supplying 5 V/1.5 A to FPGA or ARM-based controllers; immune to bus transients and EMI from nearby motor drives. Use Value: CISPR25 Class 5 compliance prevents interference with sensitive analog inputs; 400-kHz switching avoids noise coupling into 1-MHz EtherCAT timing windows. |
| Video Surveillance Systems | HVAC Control Units |
Use Scenario: Powering image sensors, ISP processors, and Wi-Fi/BLE radios in outdoor IP cameras exposed to wide ambient temperature swings and lightning-induced transients. IC Role / Device Role / Timing Role: Main system regulator converting 12–48 V PoE or battery input to clean 1.2 V, 1.8 V, and 3.3 V rails; operates continuously from –40°C to +85°C ambient. Use Value: –40°C to +150°C junction rating ensures reliability in unheated enclosures; low EMI design prevents video noise artifacts; soft-start prevents inrush current tripping PoE PSEs. | Use Scenario: Supplying control logic, display backlight, and environmental sensors in wall-mounted thermostats and rooftop HVAC controllers with limited PCB real estate. IC Role / Device Role / Timing Role: Single-chip buck converter replacing discrete regulators and LDOs; delivers 3.3 V/1.5 A to MCU, touch controller, and RF transceiver from 24-V HVAC bus. Use Value: Pin compatibility with LMR36006 allows scalable design reuse; 0.4-V dropout at full load maintains regulation during brownouts; PG flag enables safe system reset on undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36006ARNXT | Same 2-mm × 3-mm HotRod™ package, but rated for 0.6-A output and 60-V max input; 400-kHz fixed frequency. | Better suited for ultra-low-power sensor nodes (<0.6 A) where smaller solution size and lower cost are prioritized over current capability. | Select LMR36006ARNXT when output current ≤0.6 A and board space is identical; no PCB changes required due to pin compatibility. |
| LMR33630RNQT | 36-V input, 3-A output, 12-pin VQFN; different pinout and higher current capability; supports 400 kHz/1 MHz options. | Targets higher-power industrial HMI or motor control peripherals requiring ≥2 A; lacks 60-V rating and 66-V transient tolerance. | Choose LMR33630RNQT only when ≥2.5-A output is needed and input voltage stays ≤36 V; requires new layout and BOM revision. |
Compared with LMR36006ARNXT and LMR33630RNQT, the LMR36015ARNXT uniquely balances 1.5-A capability, 60-V input, 66-V surge tolerance, and 2-mm × 3-mm footprint - making it optimal for mid-power industrial edge nodes where space, ruggedness, and scalability are jointly constrained.
Availability
LMR36015ARNXT is available at Aetrix Electronics and suitable for field transmitters, PLC modules, and HVAC control units requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for LMR36015ARNXT 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 expertise.
The LMR36015 belongs to TI's LMR360x0 family of ultra-small, high-input-voltage synchronous buck converters - engineered specifically for space-constrained, rugged industrial power supplies requiring low EMI, wide temperature operation, and simplified design.
FAQ
What is the maximum input voltage rating for the LMR36015ARNXT, and does it support transient protection?
The LMR36015ARNXT has an absolute maximum input voltage rating of 66 V and a recommended operating range of 4.2 V to 60 V. Its design incorporates input transient protection up to 66 V, meeting surge immunity requirements per IEC 61000-4-5 - eliminating the need for external TVS diodes in many industrial applications. This robustness is enabled by internal circuitry that clamps and safely dissipates energy during line surges, preserving system reliability without additional components.
Does the LMR36015ARNXT support adjustable output voltage, and what is the feedback reference voltage?
Yes, the LMR36015ARNXT supports fully adjustable output voltage via an external resistor divider connected to the FB pin. Its internal feedback reference voltage is precisely 1.0 V ±15 mV (0.985 V to 1.015 V), enabling accurate regulation across output ranges from ~0.985 V to 12 V. This tight reference tolerance, combined with low FB leakage current (0.2 nA), ensures stable output even with high-value resistors used to minimize quiescent current in battery-powered designs.
How does the LMR36015ARNXT manage efficiency across varying load conditions?
The LMR36015ARNXT uses auto-mode operation that seamlessly transitions between pulse-width modulation (PWM) at heavy loads and pulse-frequency modulation (PFM) at light loads. At 1-A output with 24-V input and 5-V output, it achieves 90% efficiency at 400 kHz; in PFM mode, quiescent current drops to 26 µA, sustaining high light-load efficiency. This dual-mode architecture, coupled with integrated low-RDS(on) MOSFETs (435 mΩ HS / 280 mΩ LS), minimizes conduction and switching losses across the full 0–1.5-A range.
What is the purpose and behavior of the PG (power-good) pin on the LMR36015ARNXT?
The PG pin on the LMR36015ARNXT is an open-drain output that signals valid regulation status. It asserts high when the output voltage is within ±7% of the target (e.g., 105–107% on rise, 90–93% on fall), with built-in 80–200 µs deglitching to suppress false triggers from transients. During startup, PG remains low for ~4 ms after EN assertion before going high. If EN is pulled low or a fault occurs (overcurrent, thermal shutdown), PG is forced low - providing a reliable system reset signal for MCUs without needing external supervisors.
Is the LMR36015ARNXT pin-compatible with other devices in the LMR360x0 family, and what are the implications?
Yes, the LMR36015ARNXT is pin-compatible with the LMR36006 (0.6-A, 60-V) and LMR33620/LMR33630 (2-A/3-A, 36-V) families in the same VQFN-HR 12-pin package. This enables scalable power design: engineers can reuse PCB layouts and firmware across variants by simply swapping the IC and adjusting output capacitors or inductors. However, note that LMR336x0 devices have different current limits and thermal characteristics - full validation is required when upgrading current capability or changing input voltage range.
LMR36015ARNXT 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):
- 58V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR36015ARNXT FAQ
1.How can I place an order for LMR36015ARNXT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36015ARNXT 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 LMR36015ARNXT reliable?
The price and inventory of LMR36015ARNXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36015ARNXT is usually 5 days.
3.What payment methods are accepted for LMR36015ARNXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36015ARNXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36015ARNXT?
LMR36015ARNXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36015ARNXT 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 LMR36015ARNXT?
For technical support, including LMR36015ARNXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36015ARNXT requirements.
6.How does Aetrix verify that LMR36015ARNXT is sourced from the original manufacturer or authorized distributors?
All LMR36015ARNXT 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 LMR36015ARNXT meets industry standards.
7.What is the process for return or replacement of LMR36015ARNXT?
All LMR36015ARNXT units undergo pre-shipment inspection (PSI). If there is an issue with LMR36015ARNXT, 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 LMR36015ARNXT part is unused and in its original packaging.
Return procedure for LMR36015ARNXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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