Infineon Technologies TLS820F3ELV50XUMA1

Overview

TLS820F3ELV50 from Infineon is a 5 V ±2% automotive-grade LDO voltage regulator with integrated watchdog and reset functions, delivering up to 200 mA output current across 3 V–42 V input range, featuring 100 mV dropout at 100 mA and 26 µA quiescent current for battery-critical systems like ADAS cameras and body control modules.

For engineers reviewing the TLS820F3ELV50 datasheet, TLS820F3ELV50 pinout, TLS820F3ELV50 application, or TLS820F3ELV50 equivalent, key selection criteria include programmable reset threshold (min. 2.5 V), shared external capacitor timing for reset/watchdog, ultra-low IQ, AEC-Q100 qualification, and PG-SSOP-14 thermal performance with exposed pad.

Technical Context

The TLS820F3ELV50 integrates three independent functional blocks: a low-noise linear regulator with fast transient response and stability using only 1 µF ceramic output capacitance; a reset supervisor with adjustable undervoltage threshold (via RADJ) and power-on delay; and a watchdog timer with inhibit control (WINH) and trigger input (WI), both timed by a single external capacitor on D.

Its architecture supports permanent battery connection in automotive environments: extended 3 V start-up enables cranking operation; overtemperature shutdown and current limiting protect against short-circuit faults; EN enables system-level power sequencing; and all I/O pins tolerate up to 45 V absolute max rating, ensuring robustness against load-dump transients.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 with thermally enhanced exposed pad (connected to GND for heatsinking).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70750PDP and MAX16910ATA+, TLS820F3ELV50 uniquely combines AEC-Q100 qualification, single-capacitor synchronized timing, 26 µA IQ, and PG-SSOP-14 thermal performance-making it optimal for new automotive designs requiring integrated functional safety supervision.

Availability

TLS820F3ELV50 is available at Aetrix Electronics and suitable for automotive general ECUs, ADAS camera systems, and telematics units requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLS820F3ELV50 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, and industrial control ICs, with leadership in AEC-Q100-qualified analog and mixed-signal solutions.

TLS820F3ELV50 belongs to the OPTIREG™ linear family, designed specifically for automotive power supply systems requiring high reliability, low IQ, and integrated functional safety features like reset and watchdog supervision.

FAQ

What is the minimum input voltage required for regulation?

The TLS820F3ELV50 begins regulation at 3 V input, enabling operation during automotive cranking events where battery voltage drops below 6 V. At 3 V input and 5 V output, the device operates in dropout mode with reduced current capability, but maintains stable output as long as input exceeds VOUT + VDO (100 mV at 100 mA). Full 200 mA output is guaranteed above 5.1 V input.

How is the reset threshold programmed?

The reset threshold is set by connecting RADJ to a voltage divider between Q and GND. Default threshold is 4.65 V when RADJ is grounded. For thresholds down to 2.5 V, use a resistor network that applies the desired voltage to RADJ; the internal comparator compares this voltage to a scaled version of VOUT. No external components are needed if using the default setting.

Can the watchdog and reset timers use different timing values?

No-the TLS820F3ELV50 uses a single external capacitor on the D pin to set both reset delay and watchdog timeout. The internal circuitry derives both intervals from the same RC time constant, ensuring synchronization. To implement independent timing, external discrete circuits or a different IC with separate timing inputs would be required.

Is the exposed thermal pad electrically connected?

Yes-the exposed pad is internally connected to GND and must be soldered to a PCB copper pour tied to the system ground plane. This connection provides both thermal conduction (reducing junction temperature by up to 30°C) and improved EMI suppression. Leaving the pad unconnected degrades thermal performance and may cause instability or premature thermal shutdown.