Infineon Technologies TLF80511TCATMA1

Overview

TLF80511TCATMA1 from Infineon is a low-dropout linear voltage regulator delivering a fixed 5 V output with ±2% precision, supporting up to 400 mA load current and featuring ultra-low quiescent current of 38 µA. It operates across an extended input range starting at 3.3 V (up to 40 V), maintains regulation with only 1 µF output capacitance, and includes overtemperature shutdown and output current limiting - designed specifically for always-on automotive subsystems such as body control modules and sensor interfaces.

For engineers reviewing the TLF80511TCATMA1 datasheet, TLF80511TCATMA1 pinout, TLF80511TCATMA1 application, or TLF80511TCATMA1 equivalent, key selection criteria include dropout voltage at light load (100 mV @ 100 mA), AEC-Q100 qualification, thermal resistance (R_thJA = 33 K/W with 600 mm² heatsink), and compatibility with low-ESR ceramic capacitors in harsh automotive environments.

Technical Context

The TLF80511TCATMA1 implements a bandgap-referenced feedback loop controlling a PMOS pass transistor, enabling stable 5 V regulation even as input voltage drops to 3.3 V - entering dropout mode where V_OUT = V_IN – V_DR. Its fast regulation architecture eliminates need for complex compensation networks.

Protection logic integrates independent current-limit detection and thermal shutdown circuits that disable the pass element during overcurrent or junction temperature >150°C, with automatic restart after cooldown. The device uses a TO263-3 package with exposed thermal pad tied to GND, enabling direct PCB heatsinking.

Key Specifications

Pinout & Package

TLF80511TCATMA1 is housed in PG-TO263-3 (D²PAK) package with exposed thermal pad (Tab) electrically connected to GND. The package supports high-power dissipation via PCB copper area and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLF80511TCATMA1, the TLF80510TCATMA1 offers identical thermal and protection features but targets 3.3 V domains, while the NCP1117ST50T3G lacks automotive qualification and consumes >150× more quiescent current - making it unsuitable for always-on automotive nodes.

Availability

TLF80511TCATMA1 is available at Aetrix Electronics and suitable for automotive body electronics, engine management subsystems, and ADAS camera modules requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for TLF80511TCATMA1 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 manufacturing and R&D infrastructure.

The OPTIREG™ linear family delivers highly integrated, AEC-Q100-qualified voltage regulators optimized for automotive subsystems demanding ultra-low IQ, wide input range, and robust thermal performance.

FAQ

Is TLF80511TCATMA1 pin-compatible with other Infineon TO263-3 LDOs?

Yes - TLF80511TCATMA1 shares identical PG-TO263-3 pinout (I-GND-Q-Tab) with TLF80510TCATMA1 and TLF80512TCATMA1. All use the same footprint, thermal pad layout, and terminal assignments, enabling drop-in replacement within the same voltage grade family.

What is the minimum recommended PCB copper area for thermal management?

Infineon specifies 300 mm² minimum GND copper area under the exposed thermal pad for R_thJA = 39 K/W. For optimal thermal performance in engine bay applications, 600 mm² is recommended to achieve R_thJA = 33 K/W and sustain 400 mA continuous output at 125°C ambient.

Does TLF80511TCATMA1 require an input capacitor?

An input capacitor is not required for stability but is strongly recommended: a 100 nF X7R ceramic capacitor placed within 2 mm of the I pin suppresses high-frequency line transients and improves load step response. Larger bulk capacitance (e.g., 10 µF) may be added upstream for low-frequency ripple.

Can TLF80511TCATMA1 be used without output current limiting enabled?

No - current limiting is hardwired into the silicon design and cannot be disabled. It activates at ~500 mA (typical), reducing output voltage to protect against sustained short-circuit faults. This behavior is intrinsic to the device and forms part of its AEC-Q100 qualification test plan.