Infineon Technologies TLS850F0TAV33ATMA1

Overview

TLS850F0TAV33 from Infineon Technologies is an AEC-Q100 qualified automotive-grade low dropout linear voltage regulator in PG-TO263-7 package, delivering a fixed 3.3 V output with ±2 % accuracy, 500 mA max output current, 80 mV typical dropout at 100 mA, and 40 µA quiescent current. It integrates enable control, undervoltage reset with 16.5 ms power-on delay, adjustable reset threshold (down to 2.50 V), and a current-triggered watchdog (96 ms timeout, activated at IQ > 5.5 mA), targeting battery-permanent automotive ECUs.

For engineers reviewing the TLS850F0TAV33 datasheet, TLS850F0TAV33 pinout, TLS850F0TAV33 application, or TLS850F0TAV33 equivalent, key selection criteria include input voltage range (3.0–40 V), thermal performance under cranking conditions, ceramic capacitor stability (1 µF min), reset timing precision, and watchdog deactivation behavior tied to quiescent current threshold.

Technical Context

The TLS850F0TAV33 employs a high-stability regulation loop optimized for ceramic output capacitors as low as 1 µF, enabling fast transient response without external compensation. Its extended operating range down to 3.0 V input supports engine cranking scenarios where battery voltage dips below 6 V.

Integrated protection includes overtemperature shutdown, output current limiting, reverse polarity tolerance (via internal diode structure), and dual-function open-collector RO/WO pin supporting both reset assertion and watchdog pulse output. The RADJ pin allows precise reset threshold tuning via external resistor divider, while WI monitors microcontroller activity by detecting periodic low-to-high transitions.

Key Specifications

Pinout & Package

Package: PG-TO263-7 (D²PAK variant with exposed heat slug), thermally enhanced for automotive under-hood mounting. Heat slug must be connected to PCB copper pour or heatsink and may be tied to GND for EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PDBVR and TPS7B8733QKVURQ1, TLS850F0TAV33 delivers superior cranking capability (3.0 V min input), lowest quiescent current (40 µA), and tightest dropout (80 mV), making it optimal for battery-sensitive, safety-critical automotive domains requiring autonomous supervision.

Availability

TLS850F0TAV33 is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS camera ECUs, and transmission control modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for TLS850F0TAV33 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 qualification infrastructure.

The TLS850F0TAV33 belongs to Infineon's TLS family of automotive LDO regulators, designed specifically for battery-permanent ECU applications demanding ultra-low IQ, cranking resilience, and integrated functional safety features like reset and watchdog.

FAQ

What is the minimum input voltage required for regulation at full 500 mA load?

The TLS850F0TAV33 maintains regulation down to 3.0 V input across temperature, but output current capability decreases as input approaches dropout. At 3.3 V output and 500 mA load, minimum input is 3.38 V (3.3 V + 80 mV dropout). Below that, current limit or thermal foldback engages per electrical characteristics table.

Can the RO/WO pin drive a microcontroller reset pin directly?

Yes-the RO/WO pin is open-collector with internal pull-up to Q, so it can assert a low-active reset signal. An external 10 kΩ pull-up to 3.3 V is recommended if driving a standard CMOS reset input, ensuring valid logic levels and noise immunity during watchdog or undervoltage events.

How does the current-triggered watchdog differ from conventional watchdog timers?

Unlike time-based watchdogs requiring periodic toggling, the TLS850F0TAV33 watchdog activates only when quiescent current exceeds 5.5 mA-indicating MCU wake-up-and times out after 96 ms of inactivity. This eliminates false triggers during deep-sleep modes and simplifies firmware integration.

Is thermal derating required when mounting on a 2-layer PCB without heatsink?

Yes-PG-TO263-7 thermal resistance (R_thJA) rises to ~60 K/W on 2-layer 1 oz Cu without thermal pad connection. At 500 mA and 40 V input, power dissipation reaches 18.5 W, exceeding safe junction limits. Use ≥4 cm² copper pour under heat slug and consider forced air or heatsink for continuous full-load operation.