Infineon Technologies TLE4279GMXUMA2

Infineon TLE4279GMXUMA2 Product Summary

The TLE4279GMXUMA2, part of Infineon Technologies' OPTIREG™ Linear series, is a fixed-output, low-dropout linear voltage regulator specifically engineered for automotive environments. Delivering a stabilized 5V supply with a maximum output capability of 150mA, the TLE4279GMXUMA2 combines robust protection, adaptable control features, and a compact package, making it a strong choice for automotive power management applications requiring dependable low-noise voltage regulation.

Main Advantages of the TLE4279GMXUMA2 Linear Voltage Regulator

The TLE4279GMXUMA2 incorporates a comprehensive suite of features tailored to ensure reliable operation under harsh automotive conditions. Key highlights include:

Accurate 5V fixed output with tight tolerance (≤ ±2%)

Low dropout voltage, facilitating operation with minimal input-to-output voltage difference

Very low quiescent current, supporting energy-efficient designs

150mA maximum output current, suitable for a range of automotive loads

Early warning and reset output circuitry for system monitoring and fail-safe performance

Reset output operational down to output voltages as low as 1V

Overtemperature and short-circuit protection for robust reliability

Reverse polarity proofing to safeguard against wiring errors

Adjustable reset threshold via external voltage divider, supporting system-specific customization

Wide operating temperature range (-40°C to 150°C),

RoHS compliance and green product status for regulatory alignment

Comprehensive Electrical and Operational Specifications of TLE4279GMXUMA2

Engineered for stability and precision, the TLE4279GMXUMA2 maintains output voltage accuracy across the full automotive temperature range. The device operates with an input voltage up to 45V and features a low dropout voltage, ensuring regulation even during voltage dips—a common scenario in vehicular power networks. Robust operational reliability is delivered through built-in short-circuit and thermal-shutdown mechanisms, automatically disabling output when critical thermal limits are reached.

The reset output is triggered when the output voltage drops below 4.65V by default, with the option to lower this threshold to as far as 3.5V via an external voltage divider on the RADJ pin. Furthermore, an integrated comparator on the SI pin allows input voltage (or other voltage node) supervision, alerting systems to low-voltage conditions via the SO pin—a critical function in many automotive ECUs and safety modules.

TLE4279GMXUMA2 Package Information and Pin Layout

Available in the PG-DSO-14-61 (Small Outline) package, the TLE4279GMXUMA2 supports flexible layout and integration possibilities. Each of the pins on this package is assigned clear functions for input, output, sense, reset, and adjustment operations. Designers should pay careful attention to the pin-out to ensure correct wiring for power, control, and monitoring functions. Both reset and sense outputs are open-collector types and require external pull-up resistors (≥10kΩ) to the 5V output rail for proper signal logic levels within the system.

Functional Overview and High-Accuracy Regulation in TLE4279GMXUMA2

At the heart of the TLE4279GMXUMA2 is a precision control amplifier that stabilizes the output voltage via a reference voltage and feedback network, driving a series PNP transistor. This architecture delivers a low-noise, tightly regulated 5V output even with varying input and load conditions typical of automotive environments. Saturation control as a function of load current ensures the power element operates efficiently without excess dissipation.

The reset and early warning logic is managed through internal charging and discharging of an external delay capacitor, providing designers with flexibility to define timing tolerances. The adjustable reset voltage adds another layer of application customization, enabling targeted system response in complex automotive logic.

Guidelines for Implementing TLE4279GMXUMA2 in Automotive Applications

To maximize the stability and performance of the TLE4279GMXUMA2 in automotive applications, certain design considerations are critical:

Input capacitor (CI): Required to suppress voltage transients and compensate for line disruptions. Damping of the power input LC network can be improved by placing a 1Ω resistor in series with CI.

Output capacitor (CQ): Essential for regulator stability; must be ≥10μF with an ESR ≤10Ω across the entire temperature range.

Delay capacitor: Choice of capacitance and its temperature coefficient directly impacts reset timing accuracy—critical for power-up and fault monitoring sequences.

Pull-up resistors: Both reset (RO) and sense (SO) outputs require external pull-up resistors (≥10kΩ) to the output rail for standard logic operation.

These engineering guidelines ensure the TLE4279GMXUMA2 delivers consistent and reliable power management, critical for modules such as body controllers, infotainment systems, and advanced driver-assistance systems (ADAS).

TLE4279GMXUMA2 Performance Metrics and Durability Analysis

The TLE4279GMXUMA2 demonstrates high reliability with thermal shutdown capability above 150°C and overcurrent protection, ensuring survivability and safeguarding downstream circuits. Its low quiescent current profile makes it suitable for always-on vehicular electronics, minimizing parasitic battery drain. The reset and sense thresholds remain stable over process, voltage, and temperature, supporting predictable system designs. These performance metrics are validated over the full automotive environmental range (-40°C to 150°C), corresponding to the requirements of AEC-Q100/101 qualification.

TLE4279GMXUMA2 Environmental Standards and Certification

True to modern automotive requirements, the TLE4279GMXUMA2 is RoHS compliant and classified as a green product by Infineon Technologies. It is qualified according to AEC-Q100/101 standards, ensuring suitability for use in series production vehicles worldwide. The specified Moisture Sensitivity Level (MSL 3, 168 hours) supports standard surface-mount processes without special handling, further simplifying logistics and board assembly.

Alternative or Compatible Models to the TLE4279GMXUMA2

For applications where integrated pull-up resistors on logic outputs are desired, Infineon’s TLE4269 series offers a compatible alternative, augmenting ease of system integration. Selection of the closest equivalent should be based on required feature sets (e.g., output current rating, reset behavior, and package compatibility) as well as regulatory and qualification demands. Design engineers should also consider the electrical interface and monitoring differences when evaluating drop-in replacements or designing for dual-sourcing strategies.

Conclusion

: Key Takeaways for Engineering Decision-Makers

The TLE4279GMXUMA2 from Infineon Technologies is a robust, precision linear voltage regulator that delivers 5V/150mA with automotive-grade protections and flexible monitoring. Its strong combination of low dropout, precise reset/logic functions, and ease of integration make it well-suited for automotive power distribution and safety-critical system nodes. By strictly adhering to design guidelines and taking advantage of its advanced features, engineering and procurement teams can ensure reliable, compliant, and high-performance vehicle electronics.