Infineon Technologies TLS820F3ELV33XUMA1

Overview

TLS820F3ELV33 from Infineon is a 3.3 V ±2% automotive-grade LDO voltage regulator with integrated watchdog and reset functions, delivering up to 200 mA output current across 3–42 V input range, featuring 100 mV dropout at 100 mA and 26 µA quiescent current for battery-permanent systems such as ADAS cameras and body control modules.

For engineers reviewing the TLS820F3ELV33 datasheet, TLS820F3ELV33 pinout, TLS820F3ELV33 application, or TLS820F3ELV33 equivalent, key selection criteria include programmable reset threshold (min. 2.5 V), shared external capacitor timing for reset/watchdog, ultra-low IQ, cranking-mode operation down to 3 V input, and AEC-Q100 qualification.

Technical Context

The TLS820F3ELV33 implements a fast-stabilizing linear regulation loop requiring only a 1 µF ceramic output capacitor, enabling stable operation during automotive cold-crank (input ≥3 V) while maintaining ±2% output accuracy. Its architecture integrates independent reset and watchdog outputs, both timed by a single external capacitor on the D pin.

Reset supervision includes undervoltage detection with adjustable threshold via RADJ (default 2.5 V), power-on delay, and latchable behavior; watchdog monitoring accepts microcontroller-triggered pulses on WI and supports inhibit via WINH, with internal pull-downs on EN, WINH, and WI pins for fail-safe default disable.

Key Specifications

Pinout & Package

Package: PG-SSOP-14 (exposed thermal pad), RoHS-compliant, AEC-Q100 qualified for under-hood automotive use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDPWR and MAX16150ATB+T, TLS820F3ELV33 uniquely combines AEC-Q100 qualification, cranking-mode operation (3 V min), and co-integrated watchdog + programmable reset - making it the only choice for ASIL-B–aligned ADAS and telematics power management.

Availability

TLS820F3ELV33 is available at Aetrix Electronics and suitable for automotive general ECUs, ADAS cameras and radar systems, and body control modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLS820F3ELV33 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 R&D and manufacturing infrastructure.

TLS820F3ELV33 belongs to the OPTIREG™ linear family, designed specifically for robust, low-power, safety-conscious power regulation in automotive electronic control units.

FAQ

What is the minimum input voltage required for regulation?

The TLS820F3ELV33 maintains regulation down to 3 V input - an extended operating range that supports engine cranking conditions where battery voltage dips below nominal 12 V. This is enabled by its low-dropout architecture and optimized internal reference, allowing continued 3.3 V output even when VIN approaches VOUT + V_DO.

How is the reset threshold programmed?

The reset threshold is set via the RADJ pin: connecting it directly to GND selects the default 2.5 V threshold; applying a divided voltage between GND and Q adjusts the trip point upward. The datasheet specifies a minimum threshold of 2.5 V, and the circuit supports precise alignment with downstream logic supply tolerances.

Can the watchdog and reset timers be configured independently?

No - both reset delay and watchdog timeout are set by the same external capacitor connected between the D pin and GND. This shared timing element simplifies design but means the two functions cannot operate with different time constants; disabling the watchdog requires leaving the D pin unconnected.

Is thermal pad connection mandatory?

Yes - the exposed thermal pad must be soldered to a PCB copper pour connected to GND. It serves dual roles: thermal dissipation (critical for 150°C junction limit) and EMI suppression. Omitting this connection risks thermal shutdown under 200 mA load and degrades noise immunity in sensitive ADAS applications.