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Texas Instruments LMR36015SARNXR
- Part No.:
- LMR36015SARNXR
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR36015SARNXR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,620
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Product details
Overview
LMR36015SARNXR from Texas Instruments is a synchronous buck DC/DC converter delivering 1.5 A output current across 4.2 V to 60 V input, featuring 400-kHz fixed switching frequency, –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 power stage in industrial field transmitters and HVAC control modules.
For engineers reviewing the LMR36015SARNXR datasheet, LMR36015SARNXR pinout, LMR36015SARNXR application, or LMR36015SARNXR equivalent, key selection criteria include its 66-V input transient tolerance, 26-µA quiescent current in PFM mode, CISPR25 Class 5 EMI compliance, and precision enable with hysteresis for reliable system sequencing.
Technical Context
The LMR36015SARNXR uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode operation dynamically transitions between PWM (constant 400-kHz frequency) and PFM (diode-emulation light-load mode), optimizing efficiency across 0–1.5 A load range.
It integrates a precision power-good flag with 80–200 µs deglitch delay and ±2% hysteresis relative to 1-V feedback reference, plus thermal shutdown at 170°C with 12°C hysteresis. The device supports direct VIN connection to EN and features an internal 5-V LDO (VCC) with 3.6–4.0 V UVLO threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 60 V - supports wide industrial bus 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 PLC I/O modules. |
| Switching Frequency | 400 kHz - balances EMI performance and inductor size; avoids AM radio band while enabling compact magnetics. |
| Quiescent Current | 26 µA typical in PFM - enables >10-year battery life in always-on field transmitters operating at microamp loads. |
| Junction Temp Range | –55°C to +150°C - qualified for aerospace, defense, and under-hood industrial environments without derating. |
| Feedback Reference | 1.000 V ±15 mV - enables precise adjustable output voltage setting (e.g., 3.3 V, 5 V, 12 V) with <±1% regulation error. |
| Efficiency @ 1 A | 90% at 24 VIN/5 VOUT - reduces thermal load in sealed enclosures and lowers system cooling requirements. |
Pinout & Package
LMR36015SARNXR is housed in a 12-pin VQFN-HR (RNX) package measuring 2.00 mm × 3.00 mm with exposed thermal pad. The HotRod™ flip-chip construction minimizes parasitic inductance and switch-node ringing, supporting ultra-low EMI designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Primary return path for high-current switching loops; must be connected to AGND and CIN with short, wide traces to minimize noise coupling. |
| 2, 10 VIN | Main input supply | Accepts 4.2–60 V input; withstands 66-V transients per IEC 61000-4-5; requires low-ESR input capacitor close to pins. |
| 3 NC | No-connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing; must not be tied to any net. |
| 4 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor directly between BOOT and SW pins. |
| 5 VCC | Internal LDO output | 5-V regulated supply for internal circuitry; can power PG pull-up; requires 1-µF decoupling to AGND. |
| 6 AGND | Analog ground | Reference for FB, EN, PG; must be star-connected to PGND near IC to avoid ground bounce in feedback path. |
| 7 FB | Feedback input | Senses output voltage via resistor divider; 1-V reference enables accurate VOUT programming; must not float or short. |
| 8 PG | Open-drain power-good | Asserts high when VOUT is within ±2% of target; includes built-in filtering to ignore transient excursions <140 µs. |
| 9 EN | Enable input | Logic-controlled start-up with 1.157–1.231 V turn-on threshold and 110-mV hysteresis; supports direct VIN connection. |
| 12 SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout; ties to NC pin on PCB to reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ packaging | Eliminates bond wires to reduce parasitic inductance by >50%, suppressing switch-node ringing and easing CISPR25 Class 5 compliance. |
| Auto PFM/PWM mode | Enables 93% efficiency at 1-A load and 26-µA quiescent current at light loads-no manual mode selection required. |
| Integrated power-good flag | Provides system-level fault detection with 80–200 µs deglitch delay and true status indication-replaces external supervisor ICs. |
| 66-V input transient tolerance | Withstands surge events per IEC 61000-4-5 without external TVS, reducing BOM count and board space in harsh environments. |
| –55°C operating capability | Validated down to cryogenic temperatures for aerospace, polar instrumentation, and outdoor infrastructure deployments. |
Applications
| Industrial Field Transmitters | PLC Analog I/O Modules |
|---|---|
Use Scenario: Powering 4–20 mA loop-powered sensor transmitters in oil & gas refineries with ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V DC/DC regulator supplying ADC, DAC, and isolation drivers; provides precise enable sequencing and power-good confirmation before data acquisition. Use Value: –55°C junction rating ensures startup reliability in arctic conditions; 66-V transient tolerance eliminates need for external surge protection on 24-V supply lines. | Use Scenario: Generating isolated 5-V and ±15-V rails for analog input conditioning circuits in modular programmable logic controllers. IC Role / Device Role / Timing Role: Pre-regulator feeding isolated flyback or transformer-based secondary supplies; delivers stable 1.5-A output with minimal ripple for low-noise signal chains. Use Value: 90% efficiency at full load reduces heat buildup in densely packed I/O chassis; CISPR25 Class 5 compliance prevents interference with adjacent communication modules. |
| HVAC Control Panels | Video Surveillance Edge Nodes |
Use Scenario: Powering microcontroller, display, and environmental sensors in wall-mounted thermostats deployed across North American residential zones. IC Role / Device Role / Timing Role: Main system regulator converting 24-V AC/DC adapter output to 3.3-V logic rail; manages cold-start behavior via precision EN threshold and soft-start timing. Use Value: 4-ms soft-start prevents inrush current tripping upstream fuses; 26-µA quiescent current extends battery backup runtime during AC loss. | Use Scenario: Supplying image sensor, ISP, and Wi-Fi SoC in outdoor IP cameras exposed to automotive-grade temperature cycling and ESD events. IC Role / Device Role / Timing Role: Point-of-load converter delivering 1.8-V or 3.3-V core voltage; coordinates power sequencing with PG flag to hold processor reset until stable rail is confirmed. Use Value: HotRod™ package and spread-spectrum modulation meet stringent EMI limits for FCC Part 15B; 150°C max junction temp supports sealed metal housing operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36015SFBRNXR | 1-MHz FPWM variant with forced PWM mode enabled; higher switching frequency reduces inductor size but increases switching losses. | Better suited for space-constrained designs needing constant-frequency operation; less optimal for battery-powered devices due to higher light-load current. | Select when EMI filtering bandwidth or physical size outweighs light-load efficiency requirements. |
| LMR33630RNXT | 36-V input, 3-A output, 1-MHz option; larger current capability but narrower input range and no –55°C rating. | Applicable where higher output current is needed and input voltage stays below 36 V; not suitable for 48-V or surge-prone industrial buses. | Choose only if 3-A output and 36-V max input are confirmed system requirements; verify thermal margin at 150°C ambient. |
Compared with LMR36015SARNXR, the LMR36015SFBRNXR offers tighter frequency control at the cost of reduced light-load efficiency, while the LMR33630RNXT trades input voltage range and extended temperature capability for higher output current-making LMR36015SARNXR uniquely balanced for rugged, wide-input, low-quiescent industrial power.
Availability
LMR36015SARNXR is available at Aetrix Electronics and suitable for industrial automation, aerospace subsystems, and building management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LMR36015SARNXR 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 expertise in high-reliability industrial and automotive power solutions.
The LMR36015SARNXR belongs to TI's LMR360x5S synchronous buck converter family, engineered specifically for scalable, rugged industrial power supplies operating in extreme temperature and high-transient environments.
FAQ
What is the maximum input voltage transient the LMR36015SARNXR can withstand?
The LMR36015SARNXR is rated for 66-V input transients per absolute maximum ratings, exceeding IEC 61000-4-5 surge immunity requirements. This allows direct connection to 48-V industrial buses without external TVS diodes in most cases. The device maintains regulation during sustained 60-V input and recovers cleanly after sub-100-ns 66-V spikes. Always verify layout practices-short VIN traces and proper CIN placement-to ensure robustness in your LMR36015SARNXR design.
Does the LMR36015SARNXR support adjustable output voltage?
Yes, the LMR36015SARNXR supports fully adjustable output voltage via an external resistor divider connected to the FB pin, using its precise 1.000-V ±15-mV internal reference. Common configurations include 3.3 V, 5 V, and 12 V outputs. The feedback network must maintain stability across temperature and load; TI recommends using 1% tolerance resistors and keeping trace lengths short. The LMR36015SARNXR does not support digital voltage setting or I²C control-output adjustment is strictly analog.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR36015SARNXR PG pin is an open-drain output that goes high only after output voltage stabilizes within ±2% of target and remains high for ≥140 µs. During startup, it asserts ~4 ms after EN is asserted. It pulls low during overcurrent, thermal shutdown, or if VOUT drops below 93% of nominal. When EN is pulled low, PG also forces low-but remains valid down to 2 V input. For proper operation, connect PG to VCC or VOUT via a 10-kΩ pullup resistor; grounding PG disables the function.
Can the LMR36015SARNXR operate in forced PWM mode?
No-the LMR36015SARNXR is the 400-kHz non-FPWM variant and operates exclusively in auto PFM/PWM mode. Forced PWM functionality is only available in the LMR36015SFBRNXR (1-MHz FPWM) and LMR36015SBRNXR (1-MHz non-FPWM) variants. Attempting to force PWM on LMR36015SARNXR via external circuitry is unsupported and may compromise regulation accuracy or EMI performance. Select LMR36015SFBRNXR if constant-frequency operation is mandatory for your LMR36015SARNXR replacement.
What thermal performance can be expected from the LMR36015SARNXR in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 2-oz copper thermal pad connected to internal ground planes, the LMR36015SARNXR exhibits a junction-to-ambient thermal resistance (RθJA) of 72.5°C/W. At 1.5-A load and 24-V input, power dissipation is ~0.5 W, resulting in ~36°C junction rise above ambient. With proper thermal vias under the exposed pad and minimal trace length, this keeps junction temperature well below the 150°C limit even at 85°C ambient-enabling reliable operation in sealed enclosures without active cooling for the LMR36015SARNXR.
LMR36015SARNXR 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:
- 400kHz
- 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)
LMR36015SARNXR FAQ
1.How can I place an order for LMR36015SARNXR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36015SARNXR 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 LMR36015SARNXR reliable?
The price and inventory of LMR36015SARNXR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36015SARNXR is usually 5 days.
3.What payment methods are accepted for LMR36015SARNXR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36015SARNXR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36015SARNXR?
LMR36015SARNXR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36015SARNXR 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 LMR36015SARNXR?
For technical support, including LMR36015SARNXR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36015SARNXR requirements.
6.How does Aetrix verify that LMR36015SARNXR is sourced from the original manufacturer or authorized distributors?
All LMR36015SARNXR 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 LMR36015SARNXR meets industry standards.
7.What is the process for return or replacement of LMR36015SARNXR?
All LMR36015SARNXR units undergo pre-shipment inspection (PSI). If there is an issue with LMR36015SARNXR, 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 LMR36015SARNXR part is unused and in its original packaging.
Return procedure for LMR36015SARNXR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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