Infineon Technologies TLE4275AKSA1

Overview

TLE4275AKSA1 from Infineon Technologies is a monolithic 5-V low-drop fixed linear voltage regulator in PG-TO220-5-11 package, delivering up to 450 mA output current with ±2% output voltage accuracy (4.9–5.1 V), 250–500 mV dropout at 300 mA, and integrated power-on/undervoltage reset with programmable delay. It operates from 5.5 V to 42 V input and is AEC-Q100 qualified for automotive body control modules.

For engineers reviewing the TLE4275AKSA1 datasheet, TLE4275AKSA1 pinout, TLE4275AKSA1 application, or TLE4275AKSA1 equivalent, key selection criteria include reset threshold (4.5–4.8 V), reset delay programmability via external capacitor, reverse polarity protection, short-circuit proof operation, and thermal shutdown behavior at 150 °C junction temperature.

Technical Context

The TLE4275AKSA1 uses a bandgap reference and control amplifier to regulate output voltage by driving a series pass transistor with saturation control, preventing oversaturation under load. Its reset generator monitors VQ against a 4.65 V threshold and produces an open-collector RO signal with <2 µs reaction time.

Reset delay is set externally via capacitor on Pin 4 (D), yielding 10–22 ms delay for CD = 47 nF; internal protection includes overtemperature shutdown (150 °C), reverse polarity tolerance (−42 V), and ESD >4 kV HBM. Thermal resistance is 65 K/W (junction-to-ambient, TO220).

Key Specifications

Pinout & Package

Package: PG-TO220-5-11 (RoHS-compliant, thermally enhanced; Pin 3 internally connected to heatsink).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V automotive LDO regulator applications.

Compared with TLV73350PDBVR and MC78T05CDTG, the TLE4275AKSA1 uniquely integrates AEC-Q100-qualified reset generation, reverse-polarity tolerance, and thermal shutdown in a single TO220-5 package-enabling simplified, robust automotive power design without supplemental protection components.

Availability

TLE4275AKSA1 is available at Aetrix Electronics and suitable for body control modules, instrument clusters, engine management sensors, and HVAC control units requiring stable component supply, long-term automotive lifecycle support, and RoHS-compliant sourcing.

Supply support for TLE4275AKSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global manufacturing and automotive qualification infrastructure.

The TLE4275AKSA1 belongs to Infineon's TLE automotive linear regulator product line, engineered specifically for robust 5 V power delivery in vehicle body electronics where reset supervision, thermal resilience, and reverse-voltage survival are mandatory.

FAQ

What is the minimum input voltage required for regulation?

The TLE4275AKSA1 maintains regulation down to 5.5 V input, enabled by its low-drop architecture (250–500 mV dropout). Below this, output voltage collapses linearly; it does not operate below 5.5 V with nominal 5 V output.

How is the reset delay time calculated?

Reset delay trd is determined by the capacitor value on Pin 4 (D): trd ≈ 0.34 × CD (in nF) ms. For example, 47 nF yields ~16 ms typical delay. The internal charging current is 5.5 µA typ., and thresholds are 1.8 V (upper) and 0.4 V (lower).

Can Pin 3 (GND) be left unconnected to the PCB ground plane?

No - Pin 3 is internally bonded to the metal heatsink tab and must be soldered to a large copper pour for both electrical grounding and thermal dissipation. Leaving it unconnected risks thermal runaway and premature shutdown under load.

Is external output capacitance mandatory, and what are its requirements?

Yes - a minimum 22 µF output capacitor with ESR ≤ 5 Ω at 10 kHz is required for loop stability across the full operating temperature range. Ceramic or low-ESR tantalum capacitors meet this; aluminum electrolytics require careful ESR verification.