Infineon Technologies TLE4678GMXUMA2

Overview

TLE4678GMXUMA2 from Infineon Technologies is a monolithic low-dropout linear voltage regulator with integrated watchdog and reset functions, delivering 5 V ±2% at up to 200 mA. It operates from −42 V to +45 V input, features reverse polarity protection, −40°C to +150°C automotive temperature range, and is qualified per AEC-Q100 for engine control units and body electronics.

For engineers reviewing the TLE4678GMXUMA2 datasheet, TLE4678GMXUMA2 pinout, TLE4678GMXUMA2 application, or TLE4678GMXUMA2 equivalent, key selection criteria include programmable reset threshold (via RADJ), load-dependent watchdog activation (via WADJ), ultra-low dropout, and dual open-collector outputs (RO/WO) compatible with microcontroller monitoring in harsh automotive environments.

Technical Context

The TLE4678GMXUMA2 integrates a bandgap-referenced LDO regulator, independent reset generator with adjustable delay (via capacitor on D pin), and a positive-edge-triggered watchdog circuit with programmable activation threshold. Its protection suite includes overtemperature shutdown, short-circuit current limiting, and reverse-polarity tolerance down to −42 V.

Reset output (RO) remains active low down to VQ = 1 V, enabling reliable brown-out detection; watchdog output (WO) and reset output (RO) are electrically isolated and driven as open-collector outputs with internal pull-ups to Q. The exposed-pad PG-SSOP-14 package provides enhanced thermal dissipation for sustained 200 mA operation at high ambient temperatures.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 (exposed thermal pad), RoHS-compliant, thermally enhanced for automotive under-hood use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE4278G and TLV70750PDBVR, the TLE4678GMXUMA2 uniquely combines wide-input ruggedness (−42 V to +45 V), integrated dual supervision, and AEC-Q100 qualification - making it the sole choice for new automotive ECUs requiring single-chip power + safety monitoring.

Availability

TLE4678GMXUMA2 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 across extended automotive lifecycles.

Supply support for TLE4678GMXUMA2 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 industrial control solutions, with global manufacturing and automotive qualification infrastructure.

The OPTIREG™ Linear product line delivers robust, AEC-Q100-qualified voltage regulators and supervisors designed specifically for automotive power domains - emphasizing fault resilience, thermal stability, and integration of safety-critical functions.

FAQ

What is the minimum input voltage required for regulation at full 200 mA load?

The TLE4678GMXUMA2 maintains 5 V ±2% regulation with a typical dropout voltage of 300 mV at 200 mA. Therefore, the minimum input voltage is 5.3 V. Below this, output voltage collapses linearly with input; the device does not enter foldback or current-limit mode until VI falls below absolute minimum rating (−42 V).

Can the reset and watchdog functions operate independently?

Yes. Reset (RO) and watchdog (WO) are fully independent: RO responds solely to output voltage (Q) crossing the RADJ-set threshold, while WO responds to missing positive edges on WI or timeout determined by capacitor on D pin. Both outputs have separate open-collector drivers and internal pull-ups to Q, allowing separate MCU interrupt and reset inputs.

Is the exposed thermal pad electrically connected to GND?

Yes. The exposed pad on the PG-SSOP-14 package is internally connected to GND and serves as the primary thermal and electrical ground path. It must be soldered to a large PCB copper area tied to the system ground plane to ensure proper thermal performance (θ_JA = 50°C/W) and EMI suppression.

How is reverse polarity protection implemented internally?

Reverse polarity protection is achieved via an integrated high-voltage P-channel MOSFET between the I pin and internal regulator input. When VI is negative, the MOSFET remains off, blocking current flow. No external components are required, and the device survives −42 V applied for indefinite duration without damage or latch-up.