Texas Instruments LM2936MX-5.0

LM2936MX-5.0 Texas Instruments Voltage Regulator Product Summary

The LM2936MX-5.0 from Texas Instruments is an ultra-low quiescent current linear voltage regulator tailored for use in demanding electronic systems. Engineered for applications requiring high efficiency and robust protection, the LM2936MX-5.0 features a fixed 5V output with up to 50mA of output current, offered in an 8-pin SOIC package. Its remarkably low standby current is especially beneficial for battery-powered designs and automotive environments, where power consumption and reliability are critical constraints.

Highlights and Technical Details of LM2936MX-5.0 Texas Instruments

The core attributes of the LM2936MX-5.0 position it as an ideal choice for power-sensitive circuits operating under variable input voltages. Its key specifications include:

Input voltage range: 5.5V to 40V for the standard LM2936 version.

Ultra-low quiescent current: Typically less than 15μA at 100μA load.

Fixed output voltage: 5V (also available in 3V and 3.3V versions across the LM2936 family).

Output current: Up to 50mA continuous.

Output voltage accuracy: ±2% initial tolerance, ±3% tolerance across line, load, and temperature.

Dropout voltage: Typically 200mV at 50mA load.

Robust protections: -24V input reverse protection, -50V input transient protection, internal short circuit current limit, and thermal shutdown.

Operating temperature range: -40°C to 125°C.

These specifications make the LM2936MX-5.0 well suited for automotive, industrial control, and general point-of-load applications.

LM2936MX-5.0 Texas Instruments Electrical Characteristics

The LM2936MX-5.0’s electrical characteristics are designed to ensure stable and predictable performance under real-world conditions. The device maintains regulation with input voltages as high as 40V, and withstands voltage transients up to -50V. It supports stable operation over a wide output current range with minimal dropout, enabling reliable power delivery even when input supply levels sag. Peak output current capability and line/load transient responses are optimized for maintaining output voltage integrity in dynamic environments. Designers should note the importance of the output capacitor: a minimum of 10μF capacitance with an ESR between 300mΩ and 8Ω is mandatory for the 5V version to ensure stability and transient response.

Operational Features and Protection Mechanisms of LM2936MX-5.0 Texas Instruments

In complex applications, device protection mechanisms are vital for reliability. The LM2936MX-5.0 incorporates several distinctive protection features:

Short-circuit current limit: The regulator restricts output current in case of a load fault, preventing device damage.

Thermal shutdown: On excessive junction temperature, output is disabled until conditions normalize, guarding against permanent damage from overheating.

Reverse battery and transient input protection: Essential in automotive or field installations where accidental miswiring or voltage spikes may occur.

It’s important for design engineers to recognize that while the device supports input voltages to 40V (and up to 60V transients for the HV variant), it cannot withstand sustained output shorts at elevated input voltages due to internal pass device limitations, so proper system-level safeguards should be considered.

Usage Recommendations for LM2936MX-5.0 Texas Instruments

Practical use of the LM2936MX-5.0 requires careful consideration of external components and system architecture. In automotive systems, for instance, the regulator’s low quiescent current can extend battery life during extended shutdown periods, while in industrial controls, it offers stable power to sensitive analog and microcontroller circuitry. The recommended output capacitor ESR and capacitance must be maintained through all environmental and aging conditions; designers using ceramic capacitors should add a series resistor to ensure ESR compliance. Input capacitors are only necessary if the regulator is physically separated from bulk supply filtering, aiding in optimal line transient performance.

Power Management and Circuit Board Design Strategies for LM2936MX-5.0 Texas Instruments

Power and board layout strategies play a crucial role in maximizing LM2936MX-5.0 performance. The regulator should be placed as close as possible to both input and output capacitors on the same PCB side, with wide and short traces to minimize parasitic resistance and inductance. Proper grounding ensures best-in-class power supply rejection ratio (PSRR) and transient robustness. Thermal management must consider the package’s thermal resistance (RθJA), ambient operating temperature, and total power dissipation; engineers can use provided formulas to estimate maximum allowable load or input voltage for a given application scenario. For high-reliability applications, such as automotive modules exposed to elevated ambient temperatures, increasing copper area around ground pins and beneath the regulator enhances thermal performance.

LM2936MX-5.0 Texas Instruments Packaging and Physical Specifications

Texas Instruments offers the LM2936MX-5.0 in multiple package styles, with the SOIC-8 being prevalent for surface mount designs. Each package type adheres to JEDEC standards for outline, land pattern, and soldering recommendations to facilitate automated assembly and ensure mechanical reliability. Designers are advised to consult the latest mechanical and tape/reel specifications during board layout and material selection, especially for applications requiring high vibration or mechanical stress tolerance.

Compliance and Environmental Data for LM2936MX-5.0 Texas Instruments

The LM2936MX-5.0 upholds modern environmental and regulatory standards. It is RoHS3 compliant for lead-free, hazardous substances restrictions, and meets REACH directives, simplifying procurement and global deployment. The Moisture Sensitivity Level (MSL) is rated at 1 (unlimited), permitting flexible handling and storage. This regulatory compliance is crucial for designs destined for EU markets or those requiring extended supply chain assurances.

Alternative and Substitute Options for LM2936MX-5.0 Texas Instruments

For projects considering alternative solutions to the LM2936MX-5.0, engineers may look within the Texas Instruments LM2936 family itself, which offers 3.0V and 3.3V fixed output options with similar pinouts and electrical behavior. For higher input voltage tolerance (up to 60V), the LM2936HV variant may be appropriate. Additionally, other ultra-low quiescent current LDO regulators from Texas Instruments or equivalent devices from major analog IC suppliers should be evaluated for specific output current and package requirements. When selecting replacements, compare output voltage tolerance, dropout performance, protection features, and package availability to ensure seamless migration and system compatibility.

Conclusion

The Texas Instruments LM2936MX-5.0 stands out as a robust, energy-efficient LDO regulator optimized for applications where quiescent current, input voltage tolerance, and comprehensive device protection are critical. Its compatibility with demanding automotive and industrial environments, combined with regulatory compliance and flexible packaging, makes it an attractive solution for power supply design engineers and procurement specialists. By combining careful device selection, application-specific capacitor sourcing, and attention to layout and thermal management, the LM2936MX-5.0 can be leveraged for reliable and efficient voltage regulation in advanced electronic systems.