Infineon Technologies TLF80511EJV50XUMA1

Overview

TLF80511EJV50XUMA1 from Infineon is a fixed-output 5 V, ±2% precision low-dropout linear voltage regulator in PG-DSO8-EP package, delivering up to 400 mA output current with 100 mV dropout at 100 mA and ultra-low 38 µA quiescent current. It operates from 3.3 V to 40 V input, features overtemperature shutdown and output current limiting, and is AEC-Q100 qualified for automotive power supply applications.

For engineers reviewing the TLF80511EJV50XUMA1 datasheet, TLF80511EJV50XUMA1 pinout, TLF80511EJV50XUMA1 application, or TLF80511EJV50XUMA1 equivalent, key selection criteria include dropout performance at light load, thermal behavior under sustained 400 mA operation, stability with 1 µF/5 Ω ESR output capacitor, and compatibility with battery-backed automotive ECUs requiring <40 µA standby current.

Technical Context

The TLF80511EJV50XUMA1 implements a bandgap-referenced feedback loop controlling an internal PNP pass transistor, enabling regulation down to 100 mV headroom. Its fast regulation architecture eliminates need for complex compensation networks by relying on a single 1 µF ceramic output capacitor with ≤5 Ω ESR.

Protection functions are integrated at silicon level: current-limiting triggers when output load exceeds ~450 mA (typical), and thermal shutdown activates at junction temperature ≥150°C, followed by automatic restart after cooldown - a cycle requiring careful PCB thermal design due to potential oscillation.

Key Specifications

Pinout & Package

Package: PG-DSO8-EP (8-pin exposed-pad SOIC variant), thermally enhanced for automotive under-hood mounting. Exposed pad must be soldered to PCB GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with TLF80511EJV50XUMA1, the 3.3 V variant offers identical automotive robustness but different output voltage, while MAX1725EUT+T trades qualification and current capability for smaller size and lower quiescent current in non-automotive contexts.

Availability

TLF80511EJV50XUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera systems, and engine control units requiring stable component supply across extended temperature and voltage ranges.

Supply support for TLF80511EJV50XUMA1 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 AG 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 engineered specifically for automotive subsystems demanding high reliability, wide input range, and ultra-low quiescent current under harsh thermal conditions.

FAQ

What is the minimum input voltage required for regulation at full 400 mA load?

The TLF80511EJV50XUMA1 maintains regulation down to 5.1 V input at 400 mA load, based on its 100 mV dropout specification at 100 mA and typical dropout curve showing ~200 mV at 400 mA. Below 5.1 V, output voltage drops linearly with input until dropout region ends at 3.3 V input, where output ceases.

Can the n.c. pins (3 and 5–8) be used for PCB thermal relief or grounding?

Pins 3 and 5–8 are internally unconnected and may be tied to GND for improved mechanical anchoring and minor thermal conduction, but they provide no electrical function. The exposed pad remains the primary thermal path; connecting n.c. pins to GND adds negligible thermal benefit but improves solder joint reliability during reflow.

Is an input capacitor mandatory for stable operation?

An input capacitor is not required for loop stability but is strongly recommended: a 100 nF ceramic capacitor placed within 3 mm of Pin 1 (I) and Pin 2 (GND) suppresses high-frequency line transients and reduces input impedance at switching node frequencies, preventing interaction with upstream DC/DC converters or long harness inductance.

How does the thermal shutdown behavior impact system-level fault recovery?

When junction temperature reaches 150°C, the device shuts down and restarts upon cooling to ~140°C, creating a thermal oscillation cycle. This can cause intermittent 5 V loss in downstream circuits; system designers must limit continuous power dissipation via PCB copper area (≥300 mm² GND) or derate output current above 85°C ambient to avoid sustained cycling.