Infineon Technologies TLF80511TFV50ATMA2

Overview

TLF80511TFV50ATMA2 from Infineon Technologies is a fixed-output, low-dropout linear voltage regulator delivering 5 V ±2% at up to 400 mA, with 100 mV dropout at 100 mA, 38 µA quiescent current, and operation down to 3.3 V input - designed for always-on automotive battery-supplied systems such as body control modules and sensor interfaces.

For engineers reviewing the TLF80511TFV50ATMA2 datasheet, TLF80511TFV50ATMA2 pinout, TLF80511TFV50ATMA2 application, or TLF80511TFV50ATMA2 equivalent, key selection criteria include ultra-low IQ for battery longevity, AEC-Q100 qualification, thermal shutdown behavior, and minimal 1 µF output capacitance requirement for stable regulation in space-constrained automotive PCBs.

Technical Context

The TLF80511TFV50ATMA2 implements a bandgap-referenced feedback loop controlling an internal PNP pass transistor, enabling precise 5 V regulation across -40°C to +150°C ambient. Its extended input range (3.3–40 V) allows operation during cold-crank conditions where battery voltage dips below nominal levels.

Protection circuitry includes foldback current limiting (triggering output voltage collapse under short-circuit) and thermal shutdown with automatic restart after cooldown. The device requires only a 1 µF ceramic output capacitor with ≤5 Ω ESR at 10 kHz to maintain stability - eliminating need for bulk electrolytics in compact designs.

Key Specifications

Pinout & Package

TLF80511TFV50ATMA2 uses PG-TO252-3 (DPAK) package with exposed thermal pad (Tab) connected to GND. The 3-pin configuration supports high-current capability and efficient heat dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP1117ST50T3G and TLE42754G, the TLF80511TFV50ATMA2 uniquely combines AEC-Q100 Grade 0 qualification, 38 µA IQ, and 100 mV dropout - making it the only option among the three capable of reliable operation in high-temperature engine compartment environments with multi-year battery standby.

Availability

TLF80511TFV50ATMA2 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, and telematics control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TLF80511TFV50ATMA2 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 industrial control solutions, with global manufacturing and quality certification aligned to IATF 16949.

The OPTIREG™ Linear family delivers highly integrated, AEC-Q100-qualified voltage regulators optimized for automotive subsystems demanding ultra-low power consumption, robust thermal performance, and minimal external components.

FAQ

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

The TLF80511TFV50ATMA2 begins regulation at 3.3 V input, but full 400 mA output is only guaranteed above V_Q,nom + V_dr = 5.0 V + 0.1 V = 5.1 V. Below 5.1 V, output current capability decreases progressively until dropout occurs at exactly 5.1 V minus actual load-dependent dropout voltage.

Can the device operate without an input capacitor?

An input capacitor is not required for stability, but Infineon strongly recommends a 100 nF ceramic capacitor placed close to the I pin to suppress high-frequency line noise and transient spikes - especially critical in automotive environments with alternator ripple and load-dump events.

How does thermal shutdown behave during continuous short-circuit?

Under sustained output short-circuit, the device enters thermal shutdown at ~160°C junction temperature, turns off the pass transistor, cools down, then automatically restarts. This hiccup-mode cycling prevents destruction but causes oscillatory output - design must avoid continuous short-circuit conditions in final application.

Is the Tab (thermal pad) electrically isolated?

No - the Tab is internally connected to GND and must be soldered to a PCB GND plane. It serves both thermal conduction and electrical grounding; using insulating thermal pads or non-GND connections violates the device's thermal and electrical specifications and voids AEC-Q100 compliance.