Infineon Technologies TLS850D0TAV33ATMA1

Overview

TLS850D0TAV33ATMA1 from Infineon Technologies is an AEC-Q100 qualified automotive-grade low dropout linear voltage regulator delivering a fixed 3.3 V output at up to 500 mA, with ±2 % output voltage accuracy, 40 µA typical quiescent current, and 80 mV typical dropout voltage at 100 mA. It operates across 3.0–40 V input range and supports cranking conditions in engine control units and body electronics.

For engineers reviewing the TLS850D0TAV33ATMA1 datasheet, TLS850D0TAV33ATMA1 pinout, TLS850D0TAV33ATMA1 application, or TLS850D0TAV33ATMA1 equivalent, key selection criteria include reset threshold adjustability (down to 2.50 V), programmable power-on reset delay (8.5 ms / 16.5 ms), enable-controlled operation, thermal shutdown, and ceramic-capacitor stability with only 1 µF output capacitance.

Technical Context

The TLS850D0TAV33ATMA1 implements a high-stability regulation loop optimized for low-ESR ceramic capacitors, enabling fast transient response without external compensation. Its integrated bandgap reference and current-limiting circuitry ensure precise 3.3 V regulation under load steps up to 500 mA while maintaining ≤±2 % tolerance over temperature and line variation.

Reset functionality includes undervoltage detection with adjustable threshold via RADJ pin, open-collector RO output with internal pull-up to Q, and selectable delay timing (DT pin) for controlled system initialization. Enable logic features an integrated pull-down resistor for default-off behavior during power-up.

Key Specifications

Pinout & Package

Package: PG-TO263-7 (D²PAK-7) with exposed heat slug electrically connected to GND - enables efficient thermal dissipation in high-power automotive mounting configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73333PDBVR and TPS7B8733QKVURQ1, TLS850D0TAV33ATMA1 uniquely combines AEC-Q100 qualification, dual-programmable reset delay, adjustable threshold, and 500 mA capability in a thermally robust D²PAK-7 package-making it optimal for safety-critical, high-reliability automotive power nodes.

Availability

TLS850D0TAV33ATMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and infotainment head units requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLS850D0TAV33ATMA1 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 automotive qualification expertise.

This device belongs to Infineon's TLS850D family of automotive LDOs designed specifically for battery-connected, always-on vehicle subsystems requiring high reliability, low quiescent current, and integrated supervision functions.

FAQ

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

The TLS850D0TAV33ATMA1 maintains regulation down to an input voltage equal to its output voltage plus dropout. At 500 mA, the maximum dropout is 400 mV (per datasheet Figure 15), so minimum input is 3.3 V + 0.4 V = 3.7 V. Below that, output collapses linearly per the extended operating range specification.

Can the RO pin drive a standard CMOS input directly without a pull-up resistor?

No - RO is an open-drain output with only an internal pull-up to Q (the 3.3 V output). If Q is unpowered or unstable during startup, RO cannot assert high. An external pull-up to a stable 3.3 V or 5 V rail is required for reliable interfacing with CMOS logic inputs outside the LDO's own domain.

How does the RADJ pin adjust the reset threshold, and what resistor values achieve 2.50 V?

RADJ sets reset threshold by dividing between Q and GND. To achieve 2.50 V, connect a resistor divider where R1 (between Q and RADJ) and R2 (between RADJ and GND) satisfy V_TH = V_Q × R2/(R1+R2). For V_Q = 3.3 V, R1 = 33 kΩ and R2 = 100 kΩ yields ≈2.49 V - matching the 2.50 V minimum specified in Table 8.

Is the heat slug electrically isolated, and how must it be connected on the PCB?

The heat slug is not isolated - it is internally connected to GND. It must be soldered to a large GND copper pour on the PCB for both thermal performance and electrical integrity. Floating or misconnected heat slugs cause thermal runaway and violate AEC-Q100 mechanical stress requirements.