Overview
The LMR36015ARNXR from Texas Instruments is a highly efficient, ultra-small synchronous step-down DC/DC converter. This regulator is designed to operate over a wide input voltage range of 4.2 V to 60 V, with a transient tolerance up to 66 V, making it suitable for various industrial applications. It integrates high-side and low-side power MOSFETs, delivering up to 1.5 A of output current. The device features peak-current-mode control for optimal efficiency and output voltage accuracy, and it automatically switches between Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) based on the load to maintain high efficiency across different load conditions.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Input Voltage Range (VIN) | 4.2 | - | 60 | V |
| Output Current (IOUT) | - | - | 1.5 | A |
| Output Voltage Regulation (VOUT) | -1.5% | - | 2.5% (PFM), 1.5% (FPWM) | % |
| Switching Frequency (fSW) | - | 400 kHz / 1 MHz | - | Hz |
| Maximum Switch Duty Cycle (DMAX) | - | - | 98% | % |
| Thermal Shutdown Temperature (TSD) | - | - | 170°C | °C |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | - | 72.5°C/W | °C/W |
Key Features
- Ultra-Small Package: The LMR36015ARNXR is packaged in a VQFN-HR (12-pin) package, minimizing footprint and parasitic inductance.
- Low EMI: Optimized for ultra-low EMI requirements, meeting CISPR25 class 5 standard, with features like spread spectrum and reduced switch node ringing.
- High Efficiency: Automatically switches between PFM and PWM modes to maintain high efficiency across different load conditions.
- Internal Loop Compensation: Reduces design time and the number of external components required.
- Current Limit and Short-Circuit Protection: Features valley current limit, peak current limit, and hiccup mode for short-circuit protection.
- Thermal Shutdown and Undervoltage Lockout: Includes thermal shutdown and undervoltage lockout for enhanced reliability.
- Soft Start and Enable/Disable Functionality: Reference-based soft start prevents output voltage overshoots and large inrush currents, with precise enable/disable thresholds.
Applications
- Field Transmitters and Sensors: Suitable for use in field transmitters and sensors due to its high reliability and efficiency.
- PLC Modules: Used in Programmable Logic Controller (PLC) modules for industrial automation.
- Thermostats and HVAC Systems: Ideal for thermostats and Heating, Ventilation, and Air Conditioning (HVAC) systems.
- Video Surveillance: Applied in video surveillance systems requiring stable and efficient power supply.
- AC and Servo Drives: Used in AC and servo drives for precise control and high efficiency.
- Industrial Transport and Asset Tracking: Suitable for industrial transport and asset tracking applications.
Q & A
- What is the input voltage range of the LMR36015ARNXR?
The input voltage range is from 4.2 V to 60 V, with a transient tolerance up to 66 V.
- What is the maximum output current of the LMR36015ARNXR?
The maximum output current is 1.5 A.
- What are the switching frequencies available for the LMR36015ARNXR?
The device operates at switching frequencies of 400 kHz or 1 MHz, depending on the variant.
- How does the LMR36015ARNXR manage EMI?
The device is optimized for ultra-low EMI requirements, meeting CISPR25 class 5 standard, with features like spread spectrum and reduced switch node ringing.
- What kind of protection mechanisms does the LMR36015ARNXR have?
The device features valley current limit, peak current limit, hiccup mode for short-circuit protection, thermal shutdown, and undervoltage lockout.
- How does the LMR36015ARNXR handle soft start and enable/disable functionality?
The device uses reference-based soft start to prevent output voltage overshoots and large inrush currents, with precise enable/disable thresholds controlled by the EN input.
- What is the thermal shutdown temperature of the LMR36015ARNXR?
The thermal shutdown temperature is 170°C, with recovery at 158°C.
- What are some common applications of the LMR36015ARNXR?
Common applications include field transmitters and sensors, PLC modules, thermostats, video surveillance, HVAC systems, AC and servo drives, and industrial transport and asset tracking.
- How can I design a custom circuit using the LMR36015ARNXR?
You can use the WEBENCH Power Designer tool to create a custom design, optimize for key performance parameters, and generate a detailed design report.
- What is the package type of the LMR36015ARNXR?
The device is packaged in a VQFN-HR (12-pin) package.
