Infineon Technologies TLE426942ELXUMA1

Overview

TLE426942ELXUMA1 from Infineon Technologies is a monolithic automotive-grade low-dropout linear voltage regulator delivering a stable 5.0 V ±2% output at up to 150 mA, featuring integrated power-on/undervoltage reset with programmable delay, reverse polarity protection, and overtemperature shutdown. It operates across -40 °C to 150 °C junction temperature and accepts input voltages from -42 V to +45 V, making it suitable for engine control units and body electronics requiring robust supply regulation under harsh transients.

For engineers reviewing the TLE426942ELXUMA1 datasheet, TLE426942ELXUMA1 pinout, TLE426942ELXUMA1 application, or TLE426942ELXUMA1 equivalent, key selection criteria include its 200–330 mV dropout at 100 mA, adjustable reset threshold via RADJ pin, open-collector RO output with internal 20 kΩ pull-up, PG-SSOP-14 exposed pad thermal performance (R_thJA = 47 K/W), and AEC-Q100 qualification for automotive use.

Technical Context

The TLE426942ELXUMA1 integrates a PNP pass transistor controlled by a bandgap-referenced feedback loop, where stability depends on output capacitor C_Q (≥4.7 µF, ESR ≤2.7 Ω @10 kHz) and load current. Its reset generator uses an external capacitor on D pin to set power-on delay and an external resistor divider on RADJ to adjust threshold down from 4.65 V nominal.

Protection circuitry includes current limiting (150–500 mA trip range), reverse polarity handling (−42 V tolerance), thermal shutdown at ~151 °C with 15 °C hysteresis, and undervoltage detection active down to V_Q = 1 V. The exposed pad enhances thermal dissipation, enabling operation at full load in ambient temperatures up to 125 °C with appropriate PCB copper area.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 with exposed thermal pad (connected to GND for optimal heat transfer).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDRVR and TPS7B6950QDCYRQ1, the TLE426942ELXUMA1 uniquely combines AEC-Q100 Grade 0 qualification, adjustable reset threshold, reverse polarity tolerance to −42 V, and PG-SSOP-14 exposed pad for superior thermal performance in high-ambient under-hood applications.

Availability

TLE426942ELXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering control units requiring stable component supply under automotive qualification and long-term lifecycle support.

Supply support for TLE426942ELXUMA1 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 electronics, and security solutions, with global manufacturing and quality certification aligned to IATF 16949.

The TLE426942ELXUMA1 belongs to Infineon's TLE automotive linear regulator product line, designed specifically for demanding under-hood applications requiring extended temperature operation, high transient immunity, and integrated functional safety features.

FAQ

What is the minimum output capacitance required for stable operation?

The TLE426942ELXUMA1 requires a minimum output capacitor of 4.7 µF with ESR ≤2.7 Ω at 10 kHz for guaranteed stability across temperature and load. Using 10 µF reduces ESR tolerance to ≤3 Ω. Ceramic capacitors must be placed within 5 mm of pins 11 (Q) and 4/6 (GND) to minimize parasitic inductance and ensure transient response.

How is the reset delay time programmed?

Reset delay is set by connecting a ceramic capacitor between Pin 3 (D) and GND. A 100 nF capacitor yields approximately 100 ms delay; values from 10 nF to 1 µF provide delays from ~10 ms to ~1 s. The capacitor must be X7R or better dielectric; NP0/C0G is preferred for temperature stability. Leaving Pin 3 open disables the reset function entirely.

Can the TLE426942ELXUMA1 operate with input voltage below 5.5 V?

No. The functional input voltage range starts at 5.5 V per the datasheet's "Functional Range" table. Below this, regulation cannot be maintained and the output collapses. During cold-crank events where battery voltage dips to 4.5 V, the device ceases regulation but remains undamaged due to its −42 V reverse polarity rating and internal protection circuitry.

Is the exposed thermal pad electrically isolated?

No. The exposed pad is internally connected to GND and must be soldered to a GND copper pour on the PCB. It serves both thermal conduction and electrical grounding functions. Failure to connect it results in elevated junction temperature, reduced output current capability, and potential thermal shutdown under load.