Infineon Technologies TLE4276DVATMA1

Overview

TLE4276DVATMA1 from Infineon Technologies is a monolithic adjustable positive linear voltage regulator with 400 mA output current capability, integrated short-circuit and thermal shutdown protection, and a TO-252-5 (DPAK) package. It operates over an input voltage range of 5.5 V to 40 V and delivers an adjustable output from 1.25 V to 28 V using two external resistors, commonly used in automotive body control modules for powering microcontrollers and sensors.

For engineers reviewing the TLE4276DVATMA1 datasheet, TLE4276DVATMA1 pinout, TLE4276DVATMA1 application, or TLE4276DVATMA1 equivalent, key selection criteria include output adjustability via external resistors, automotive-grade AEC-Q100 qualification, dropout voltage at full load, thermal shutdown hysteresis, and SOA-limited current foldback behavior under overload.

Technical Context

This device implements a bandgap reference-based error amplifier driving a PNP pass transistor, enabling stable regulation across wide temperature and load transients. It features built-in reverse-battery protection, undervoltage lockout (UVLO) at ~4.5 V, and a dedicated "Reset" output that asserts low when V_OUT drops below 90% of nominal setting.

The regulator supports fixed-frequency internal oscillator-free operation and does not require external compensation. Its SOA protection limits peak current during short-circuit events while maintaining safe junction temperature via thermal foldback, and its Reset pin provides system-level power-good signaling for microcontroller boot sequencing.

Key Specifications

Pinout & Package

Supplied in a TO-252-5 (DPAK) surface-mount package with exposed thermal pad for enhanced PCB heat dissipation. Pin 1 is Input, Pin 2 is Ground, Pin 3 is Adjust, Pin 4 is Output, Pin 5 is Reset.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117LV33DCYR and LM2940CT-5.0/NOPB, the TLE4276DVATMA1 uniquely combines AEC-Q100 qualification, adjustable output, reverse-battery tolerance, and integrated RESET - making it the only option suitable for safety-critical automotive body electronics requiring coordinated power sequencing and fault resilience.

Availability

TLE4276DVATMA1 is available at Aetrix Electronics and suitable for automotive body control modules, door control units, lighting control units, and climate control panels requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for TLE4276DVATMA1 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 centers.

The TLE4276 series belongs to Infineon's automotive linear regulator product line, designed specifically for robust, low-noise power supply in body electronics and chassis control units operating under harsh automotive electrical conditions.

FAQ

What is the minimum input voltage required for regulation at 5 V output?

The TLE4276DVATMA1 requires a minimum input voltage of 5.5 V to maintain regulation at 5 V output, due to its typical 0.5 V dropout voltage at full 400 mA load. At lighter loads (<50 mA), dropout falls to ~0.35 V, allowing operation down to ~5.35 V input. Operation below 5.5 V may cause output collapse or RESET assertion.

Does the RESET pin require an external pull-up resistor?

Yes, the RESET pin is open-drain and must be pulled up to a valid logic rail (e.g., V_OUT or another monitored supply) using a 10 kΩ resistor. Without pull-up, the pin remains floating and cannot assert a valid low signal during brown-out, compromising system reset reliability.

Can this regulator be used without the ADJ pin connected?

No - the ADJ pin must be connected to a resistor divider between OUT and GND to set the output voltage. Leaving ADJ unconnected disables regulation; the device will not produce a defined output. The internal 1.25 V reference requires external feedback to establish closed-loop control.

Is the TO-252-5 package thermally enhanced compared to standard TO-252?

Yes - the TO-252-5 variant includes an exposed thermal pad (Pin 2/GND) soldered to a large PCB copper pour, achieving θ_JA ≈ 50 °C/W (vs. ~75 °C/W for standard TO-252). This enables 400 mA continuous operation at +85 °C ambient without heatsink, provided ≥200 mm² of 2-oz copper is used under the pad.