Infineon TLE4270S: A 5-V Low-Drop Voltage Regulator for Automotive and Industrial Applications
In the demanding environments of modern automotive electronics and industrial control systems, stable and reliable power supply is non-negotiable. The Infineon TLE4270S addresses this critical need as a monolithic integrated low-drop voltage regulator, delivering a fixed 5-V output with exceptional accuracy and robustness.
This regulator is engineered to handle a wide input voltage range from 5.5 V up to 42 V, making it perfectly suited for load-dump resilient automotive applications where voltage spikes are common. Its key performance metric, the low dropout voltage, is typically just 400 mV at a full load current of 450 mA. This efficiency ensures stable operation even when the input voltage dips close to the output level, a crucial feature during cranking scenarios in vehicles.
Beyond its core regulation function, the TLE4270S is packed with integrated protection features that guarantee safe operation under fault conditions. These include:
Current Limitation to protect the IC and the load from short circuits.
Overtemperature Shutdown that disables the output if the junction temperature exceeds safe limits, reactivating it once the IC has cooled.
Reverse Polarity Protection (-40 V), safeguarding the circuit if the battery connections are accidentally reversed.
Furthermore, the device includes a reset output with a programmable delay. This function monitors the output voltage and provides a signal to a microcontroller to initiate a system reset if the supply voltage becomes unstable or drops below a defined threshold, ensuring controlled system behavior.
Housed in a PG-TO263-5-1 package, the TLE4270S offers excellent thermal performance, allowing it to dissipate heat effectively in harsh under-the-hood environments or on industrial PCBs. Its AEC-Q100 qualification underscores its automotive-grade reliability, making it a cornerstone for powering ECUs, sensors, and other critical systems where failure is not an option.
The Infineon TLE4270S is a robust, feature-rich 5V low-dropout regulator designed to deliver highly reliable power for automotive and industrial systems. Its integration of critical protections like overtemperature shutdown, reverse polarity resilience, and a microcontroller reset function makes it an exceptional choice for mission-critical applications demanding longevity and stability under extreme conditions.
Keywords: Low-Dropout Regulator (LDO), Automotive Grade, Reverse Polarity Protection, Reset Output, Load-Dump Resilience.
