Infineon Technologies TLF80511EJV33XUMA1

Overview

TLF80511EJV33XUMA1 from Infineon is a low-dropout linear voltage regulator delivering a fixed 3.3 V output with ±2% precision, supporting up to 400 mA load current, ultra-low 38 µA quiescent current, and 100 mV dropout at 100 mA - designed for always-on automotive battery-supplied systems.

For engineers reviewing the TLF80511EJV33XUMA1 datasheet, TLF80511EJV33XUMA1 pinout, TLF80511EJV33XUMA1 application, or TLF80511EJV33XUMA1 equivalent, key selection criteria include extended 3.3 V input start-up capability, 1 µF minimum output capacitance requirement, AEC-Q100 qualification, thermal shutdown behavior, and PG-DSO8-EP package layout constraints.

Technical Context

The device implements a bandgap-referenced feedback loop controlling an internal pass transistor to maintain regulated 3.3 V output across input voltages from 3.3 V (extended range) to 40 V. Its fast regulation architecture enables stable operation with only 1 µF output capacitor and specified ESR ≤ 5 Ω at 10 kHz.

Protection functions include foldback current limiting that reduces output voltage under overload or short-circuit conditions, and thermal shutdown that disables the pass transistor when junction temperature exceeds ~150°C - with automatic restart after cooldown, requiring careful PCB thermal design due to oscillatory behavior under sustained fault.

Key Specifications

Pinout & Package

TLF80511EJV33XUMA1 is housed in a thermally enhanced PG-DSO8-EP (exposed pad) package, optimized for automotive thermal cycling and high-power dissipation. The exposed pad must be soldered to a dedicated GND copper area on PCB for effective heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLF80511EJV33XUMA1, the 5 V variant offers identical automotive reliability but mismatches 3.3 V logic systems, while the NCP1117 trades AEC-Q100 compliance and 38 µA IQ for lower cost and higher current - making it unsuitable for battery-critical or under-hood automotive use.

Availability

TLF80511EJV33XUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, engine control units, and infotainment systems requiring stable component supply with AEC-Q100 assurance and long-term production continuity.

Supply support for TLF80511EJV33XUMA1 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 industrial control solutions, with global manufacturing and qualification infrastructure.

The OPTIREG™ Linear product line delivers highly integrated, AEC-Q100-qualified voltage regulators targeting automotive subsystems demanding ultra-low IQ, extended input range, and robust thermal performance.

FAQ

What is the minimum input voltage required for regulation with TLF80511EJV33XUMA1?

The device enters regulation at 3.3 V input (extended operating range), maintaining 3.3 V output until dropout occurs. Below 3.3 V, output drops linearly with input. This 3.3 V start-up threshold enables use in low-voltage backup paths and post-buck configurations where traditional 5 V LDOs would fail.

Can TLF80511EJV33XUMA1 operate without an input capacitor?

An input capacitor is not required for stability but is strongly recommended: a 100 nF ceramic capacitor placed within 3 mm of the I pin suppresses line transients and improves PSRR above 100 kHz. Omission risks noise coupling into sensitive downstream circuits during load dump or ignition switching events.

How does the thermal shutdown behave under continuous short-circuit conditions?

Under sustained short-circuit, the device cycles between thermal shutdown and restart - disabling output until junction cools below ~140°C, then re-enabling until temperature rises again. This oscillation causes average power dissipation to drop but risks accelerated aging; PCB thermal design must ensure R_thJA ≤ 67 K/W with ≥300 mm² heatsink area to avoid cycling.

Is the exposed pad electrically connected internally?

Yes, the exposed pad is internally connected to GND and must be soldered to a dedicated GND copper area on the PCB. It serves both thermal conduction and electrical grounding functions - floating or unconnected pads cause excessive junction temperature rise and premature thermal shutdown.