5-V Low-Drop Fixed Voltage Regulator
The Siemens TLE4271 is a 5‑V low‑drop fixed‑voltage regulator designed for automotive electronics and other applications requiring tight output voltage tolerance. It features integrated over‑temperature, over‑voltage, reverse‑polarity and short‑circuit protection, as well as a watchdog and reset circuit.
The document provides functional description, pin configuration, absolute maximum ratings, operating ranges, electrical characteristics, and package dimensions for the TO‑220 and TO‑263 variants. Design notes for external components and application guidelines are also included.
| Output voltage tolerance | < + 2 % |
|---|---|
| Maximum input voltage | 42 V (65 V for < 400 ms) |
| Overvoltage protection | 65 V for < 400 ms |
| Output current (≤ 26 V input) | up to 550 mA |
| Short‑circuit current limit | ≈ 650 mA |
| Drop voltage (550 mA load) | 0.35 V – 0.70 V |
The device can handle up to 42 V continuously, with an over‑voltage protection that allows up to 65 V for less than 400 ms.
At an input of 26 V the regulator can supply a regulated output current of more than 550 mA.