Infineon Technologies TLE4291EXUMA1

Overview

TLE4291EXUMA1 from Infineon Technologies is a monolithic automotive-grade low-dropout linear voltage regulator in PG-SSOP-14 EP package, delivering a fixed 5.0 V ±2% output with up to 450 mA load current. It integrates power-on/undervoltage reset, programmable-delay watchdog, reverse polarity protection, overtemperature shutdown, and operates across -40 °C to +150 °C. Used to supply microcontrollers (e.g., XC22xx) in engine control units and body electronics.

For engineers reviewing the TLE4291EXUMA1 datasheet, TLE4291EXUMA1 pinout, TLE4291EXUMA1 application, or TLE4291EXUMA1 equivalent, key selection criteria include its 450 mA output capability, 1 V minimum reset operation, 7 K/W junction-to-case thermal resistance, and AEC-Q100 qualification for under-hood environments.

Technical Context

The device implements a bandgap-referenced LDO core with internal current limiting and thermal shutdown. Its reset generator triggers low when V_Q drops below an adjustable threshold (via RADJ), with delay set by capacitor D; reset remains active down to V_Q = 1 V.

The watchdog function monitors positive edges on WI and resets WO if no edge occurs within the timeout period defined by capacitor D. Both reset and watchdog timing share the same external capacitor, enabling synchronized fault detection in safety-critical MCU supervision.

Key Specifications

Pinout & Package

PG-SSOP-14 EP (exposed pad) package with 14 terminals and integrated thermal pad connected to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70750PDP and MAX16126ATP+, TLE4291EXUMA1 uniquely balances 450 mA output, full AEC-Q100 Grade 0 qualification, and integrated reset/watchdog sharing one timing capacitor-making it optimal for single-rail MCU supervision where robustness and simplicity are prioritized.

Availability

TLE4291EXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply under extended temperature and transient stress conditions.

Supply support for TLE4291EXUMA1 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 R&D infrastructure.

The TLE4291 belongs to Infineon's TLE automotive linear regulator product line, designed specifically for robust, integrated power supply and supervision in engine, chassis, and body electronics applications.

FAQ

What is the minimum input voltage required for regulation?

The TLE4291EXUMA1 maintains regulation as long as input voltage exceeds output voltage plus dropout voltage. At 450 mA load, typical dropout is 300 mV, so minimum input is ~5.3 V. Below this, output follows input (pass-through mode) but remains within functional range down to VI = 3.3 V per datasheet Section 4.2.2.

How is the reset delay time programmed?

Reset delay is set by capacitor D connected between pin 8 (D) and GND. The delay time t_RD ≈ 1.1 × C_D × R_INT, where R_INT is an internal resistor (~1.2 MΩ). For example, a 100 nF capacitor yields ~132 ms delay. Values are specified in Section 8.2 of the datasheet.

Can the watchdog and reset functions operate independently?

No - both functions share the same timing capacitor D and internal oscillator. While their trigger conditions differ (reset responds to V_Q drop, watchdog to missing WI edges), their timeout periods are inherently coupled. Independent timing requires separate ICs or a more advanced supervisor like MAX16126.

Is the exposed thermal pad electrically isolated?

No - the exposed pad (pin 14) is internally connected to GND and must be soldered to a PCB copper area tied to system ground. This provides both thermal conduction and low-inductance grounding essential for noise immunity and thermal performance, as confirmed in Package Outline section and Pin Definitions.