Infineon Technologies TLE4270NKSA1

Overview

TLE4270NKSA1 from Infineon Technologies is a 5-V fixed-output, low-dropout linear voltage regulator with integrated reset generator, reverse polarity protection, overvoltage (65 V/400 ms), overtemperature, and short-circuit protection. It delivers up to 650 mA output current with ±2% output voltage tolerance and supports input voltages from 5.5 V to 42 V - designed for automotive power supply rails feeding microcontrollers and sensors.

For engineers reviewing the TLE4270NKSA1 datasheet, TLE4270NKSA1 pinout, TLE4270NKSA1 application, or TLE4270NKSA1 equivalent, key selection criteria include its adjustable reset delay (via external capacitor), 350–700 mV dropout at 550 mA, 4.5 V reset threshold, and TO-220-5-11 package thermal performance (R_thj-c = 3 K/W).

Technical Context

The TLE4270NKSA1 uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain regulation across load and line variations. Its internal reset generator monitors output voltage and asserts an open-collector RO signal when V_Q falls below 4.5 V, with delay set by capacitor on pin D.

Protection circuitry includes foldback current limiting (650 mA typical trip), thermal shutdown at ~150 °C junction, reverse-polarity blocking, and overvoltage latching at 42–46 V with hysteresis restoring operation below 36 V - all implemented in a single monolithic IC without external components.

Key Specifications

Pinout & Package

Package: P-TO220-5-11 - thermally enhanced through-hole package with integrated heatsink connection on pin 3 (GND), R_thj-c = 3 K/W.

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 MAX16126ATA+T, the TLE4270NKSA1 uniquely combines 650 mA drive, 65 V/400 ms surge tolerance, reverse polarity blocking, and adjustable reset - making it the only drop-in solution for AEC-Q100-compliant ECU core rail designs.

Availability

TLE4270NKSA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and instrument clusters requiring stable component supply across automotive production lifecycles.

Supply support for TLE4270NKSA1 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, and industrial control ICs, with global manufacturing and AEC-Q100 qualification infrastructure.

The TLE4270NKSA1 belongs to Infineon's TLE family of automotive-grade linear regulators - engineered specifically for robust 5 V power delivery in harsh vehicle electrical environments, including start-stop and load-dump conditions.

FAQ

What is the minimum input voltage required for regulation?

The TLE4270NKSA1 begins regulating at 5.5 V input. Below this, output voltage drops linearly with input. Regulation is guaranteed from 5.5 V to 42 V, with full 650 mA capability maintained up to 26 V input and 550 mA load.

How is the reset delay time calculated?

Reset delay t_rd is determined by the capacitor C_D connected between pin D and GND: t_rd ≈ 0.13 × C_D (with C_D in nF yielding t_rd in ms). For example, 100 nF yields ~13 ms delay. The internal charge current is 8–25 µA, verified per Table 4.

Can the RO pin drive a 3.3 V microcontroller reset input directly?

Yes. The RO pin is an open-collector output with internal 30 kΩ pull-up to V_Q (5 V). When asserted, it pulls down to ≤60 mV (at 1.0–4.5 V V_Q). To interface with 3.3 V logic, connect RO to the MCU reset pin and use the MCU's internal weak pull-up or add a 10 kΩ external pull-up to 3.3 V.

Does the device require an external heat sink in TO-220-5-11 package?

At 650 mA and 13.5 V input, power dissipation is ~5.5 W. With R_thj-c = 3 K/W and R_thc-a ≈ 25 K/W (typical PCB mount), junction temperature rises ~70 °C above ambient. For 125 °C max T_j, ambient must stay below 55 °C without additional heatsink; a small finned heatsink is recommended for sustained full-load operation in enclosed enclosures.