Infineon Technologies TLE4275S

Overview

TLE4275S from Infineon Technologies is a monolithic 5-V low-drop fixed linear voltage regulator in PG-TO220-5-12 package, designed for automotive power supply rails. It delivers 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 via external capacitor. Used in engine control units (ECUs) for microcontroller core supply.

For engineers reviewing the TLE4275S datasheet, TLE4275S pinout, TLE4275S application, or TLE4275S equivalent, key selection criteria include guaranteed 450 mA load capability, reset threshold of 4.65 V (±0.15 V), operation down to VQ = 1 V, reverse polarity protection, and AEC-Q100 qualification for automotive environments.

Technical Context

The TLE4275S employs a bandgap-referenced control amplifier driving a series pass transistor with saturation control to prevent oversaturation under high load. Its internal reset generator uses dual thresholds (VDU = 1.8 V typ., VDRL = 0.4 V typ.) on the D pin to set delay time (10–22 ms with 47 nF), while RO provides open-collector reset signal with VROL ≤ 0.4 V at IRO ≥ 5 kΩ.

Thermal protection disables the regulator above 150 °C junction temperature. Input voltage range is 5.5–42 V, with absolute max rating of −42 V to +45 V. Stability requires CQ ≥ 22 µF (ESR ≤ 5 Ω at 10 kHz) and CI ≥ 1000 µF, damped by ~1 Ω series resistor.

Key Specifications

Pinout & Package

Package: PG-TO220-5-12 - thermally enhanced 5-pin through-hole package with Pin 3 internally connected to heatsink and ground.

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 TPS7B6750QPWPRQ1, the TLE4275S uniquely combines AEC-Q100 qualification, programmable reset delay, reverse polarity protection, and TO-220 thermal performance-making it optimal for cost-sensitive, thermally demanding ECU designs where functional safety integrity is required.

Availability

TLE4275S is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply with full automotive qualification and long-term lifecycle support.

Supply support for TLE4275S 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 R&D centers.

The TLE4275S belongs to Infineon's TLE automotive linear regulator family, engineered specifically for robust, low-noise 5 V supply generation in harsh automotive environments including start-stop and load-dump conditions.

FAQ

What is the minimum input voltage required for regulation?

The TLE4275S requires a minimum input voltage of 5.5 V to maintain 5 V output regulation. Below this, the output drops linearly with input due to insufficient headroom for the internal pass transistor's saturation control. At 5.5 V input and 400 mA load, output remains within specification only if dropout voltage stays ≤500 mV - verified in datasheet Table 4 under VI = 5.5 V condition.

Can the reset delay be disabled or shortened below 10 ms?

No, the reset delay cannot be disabled - the D pin must be connected to GND via a capacitor to enable reset functionality. Minimum delay is 10 ms with 47 nF; using smaller capacitors (e.g., 22 nF) reduces delay but violates datasheet characterization and may cause inconsistent reset timing across temperature and voltage. No internal bypass or zero-delay mode exists.

Is an input capacitor mandatory, and what value is recommended?

Yes, an input capacitor is mandatory for stability and line transient suppression. The datasheet specifies CI ≥ 1000 µF aluminum electrolytic, damped with ~1 Ω series resistor to suppress LC oscillation from wiring inductance. Ceramic input caps alone are insufficient; bulk capacitance and damping are required to prevent instability during load dump or cranking events.

Does the TLE4275S support parallel operation for higher current?

No, the TLE4275S is not designed for parallel operation. Its internal saturation control and lack of current-sharing circuitry mean paralleling units causes unequal current distribution and potential thermal runaway. For >450 mA, select a single higher-current regulator (e.g., TLE4276-2) or use a switching pre-regulator stage followed by TLE4275S for noise-sensitive loads.