Infineon Technologies TLS850F3TUV50ATMA1

Overview

TLS850F3TUV50 from Infineon is an AEC-Q100 qualified automotive-grade low-dropout linear voltage regulator with integrated watchdog and reset functions, delivering 5 V ±2% output at up to 500 mA across 3 V–42 V input range, ultra-low 26 µA quiescent current, and 300 mV dropout at 250 mA - deployed in ADAS radar modules for stable post-cranking supply under battery dip conditions.

For engineers reviewing the TLS850F3TUV50 datasheet, TLS850F3TUV50 pinout, TLS850F3TUV50 application, or TLS850F3TUV50 equivalent, key selection criteria include cranking-compatible extended input range (3 V), shared capacitor-programmable reset/watchdog timing, open-collector RO/WO output, thermal shutdown behavior, and PG-TO252-7 exposed-pad thermal performance.

Technical Context

The TLS850F3TUV50 implements a single-loop LDO architecture with fast transient response enabled by internal compensation requiring only 1 µF ceramic output capacitance. Its regulation loop maintains ±2% output accuracy over -40°C to 150°C junction temperature and load currents up to 500 mA.

Reset and watchdog functions share a single external delay capacitor on the D pin, enabling synchronized timing control: undervoltage reset activation at V_Q < 4.75 V and watchdog timeout triggered by missing WI pulses. Internal protection includes current limiting and thermal shutdown with latch-off behavior.

Key Specifications

Pinout & Package

Package: PG-TO252-7 with thermally enhanced exposed pad (internally connected to GND); requires PCB copper pour ≥300 mm² for R_thJA ≤66 K/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive LDO-with-watchdog applications.

Compared with TLV70750PDPKR and MAX16910ATA/V+T, the TLS850F3TUV50 uniquely integrates 5 V regulation, cranking-down-to-3 V operation, and shared-capacitor watchdog/reset in a single AEC-Q100 Grade 1 package - eliminating discrete timing components and secondary LDOs in 5 V-centric automotive domains.

Availability

TLS850F3TUV50 is available at Aetrix Electronics and suitable for ADAS radar modules, telematics gateways, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for TLS850F3TUV50 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 optimized for automotive subsystems requiring cranking resilience, low IQ, and integrated functional safety features like watchdog and reset.

FAQ

What is the minimum input voltage required for regulation?

The TLS850F3TUV50 begins regulation at 3 V input - verified per Functional Range Table 2 (VI(ext) = 3 V to 42 V). This extended range supports operation during engine cranking when battery voltage dips below 6 V, maintaining 5 V output as long as dropout margin (V_IN – V_OUT) ≥300 mV at load.

How is watchdog timeout configured?

Watchdog timeout is set by the external capacitor connected between pin D and GND. The same capacitor determines both reset delay and watchdog timeout period, with typical values ranging from 100 nF (≈20 ms) to 1 µF (≈200 ms), as characterized in Section 4.4.2 of the datasheet.

Can RO/WO drive a standard CMOS input directly?

No - RO/WO is an open-collector output requiring an external pull-up resistor to V_Q or another logic rail. It sinks current when active; typical pull-up is 10 kΩ to 5 V, delivering ~0.5 mA sink capability per the absolute maximum rating table.

Is thermal derating required above 125°C ambient?

Yes - while the device is qualified for junction temperatures up to 150°C, ambient operation above 125°C requires thermal design validation. With 300 mm² PCB copper, R_thJA is 66 K/W; at 125°C ambient and 500 mA load, power dissipation (0.3 V × 0.5 A = 150 mW) yields ~10°C rise - staying within limit. Larger loads or smaller copper require heatsink verification.