Infineon Technologies TLE4279GMXUMA1

Overview

TLE4279GMXUMA1 from Infineon Technologies is an AEC-Q100-qualified automotive linear voltage regulator delivering a precise 5 V ±2% output with 150 mA load capability, 0.25 V typical dropout at 100 mA, and integrated reset generation triggered at VQ < 4.65 V. It operates from 6–45 V input across −40 °C to +150 °C junction temperature and features reverse-polarity protection, thermal shutdown at 150 °C, and adjustable reset threshold via external voltage divider.

For engineers reviewing the TLE4279GMXUMA1 datasheet, TLE4279GMXUMA1 pinout, TLE4279GMXUMA1 application, or TLE4279GMXUMA1 equivalent, key selection considerations include its PG-DSO-14 package, open-collector reset/sense outputs, external capacitor–programmable reset delay (17–28 ms), low-quiescent-current operation (150–800 µA), and automotive-grade supervision functionality for ECU power rails.

Technical Context

The TLE4279GMXUMA1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling stable 5 V regulation under wide input voltage (6–45 V) and temperature (−40 °C to +150 °C) conditions. Its internal comparator monitors output voltage against a 1.35 V reference to assert reset when VQ falls below 4.65 V, with threshold adjustable via RADJ pin.

Reset timing is controlled by an external capacitor on the D pin, generating a programmable delay (e.g., 28 ms with 100 nF); the reset output (RO) and sense output (SO) are open-collector, requiring external pull-ups. The SI pin enables input voltage monitoring using an internal comparator with hysteresis (1.20–1.31 V thresholds).

Key Specifications

Pinout & Package

Package: PG-DSO-14 (exposed pad, RoHS-compliant, moisture sensitivity level 3). Thermal resistance R_thJA = 70 K/W; R_thJP = 30 K/W to Pin 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive voltage regulation and supervision applications.

Compared with TLE4279GMXUMA1, the TLE4276G reduces cost and footprint but removes all supervision functions, while the TLV73350PDBVR offers higher current and lower dropout but lacks AEC-Q100 qualification, thermal protection, and system-level fault signaling-making neither a drop-in replacement for automotive safety-critical use.

Availability

TLE4279GMXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS domain controllers requiring stable component supply under extended temperature and automotive reliability standards.

Supply support for TLE4279GMXUMA1 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 OPTIREG™ Linear product line delivers AEC-Q100-qualified voltage regulators and supervisors designed specifically for demanding automotive power domains-including engine, chassis, and driver assistance systems-where reliability, thermal robustness, and functional safety are mandatory.

FAQ

What is the maximum input voltage rating for TLE4279GMXUMA1?

The absolute maximum input voltage is 45 V, with recommended operating range from 6 V to 45 V. This rating allows operation during automotive load-dump events (up to 40 V per ISO 7637-2) and cold-crank conditions down to 6 V, ensuring uninterrupted function across the full vehicle battery envelope.

How does the RADJ pin adjust the reset threshold?

The RADJ pin connects to a resistor divider between Q (5 V) and GND, scaling the internal 1.35 V reference. A 10 kΩ/10 kΩ divider lowers the effective reset threshold to ~4.0 V; the device specifies VRADJ,TH = 1.35 V ±0.09 V, enabling precise brownout tuning for system-specific voltage margins.

Can TLE4279GMXUMA1 drive a 150 mA load continuously at 125 °C ambient?

Yes-when mounted on a PCB with adequate copper area and the PG-DSO-14 exposed pad soldered, its R_thJA = 70 K/W allows 150 mA continuous output at 125 °C ambient while maintaining T_j ≤ 150 °C. Derating is required only above 125 °C ambient or with insufficient thermal layout.

Is an external capacitor required on the D pin for reset functionality?

Yes-an external capacitor (e.g., 100 nF) between D pin and GND sets the reset delay time (28 ms typ.). Without it, the internal comparator triggers reset immediately upon VQ drop, eliminating the programmable delay that prevents false resets during short transients like starter motor engagement.