Infineon Technologies TLE4276DV50ATMA2

Overview

TLE4276DV50ATMA2 from Infineon is a fixed-output 5.0 V low-dropout linear voltage regulator in PG-TO252-5 package, rated for 400 mA output current, ±4% output voltage tolerance, and input voltage range up to 40 V. It features an inhibit input (INH) enabling <10 µA shutdown current, reverse-polarity protection, short-circuit proofing, and thermal shutdown - designed for automotive power supply rails in engine control units and body electronics.

For engineers reviewing the TLE4276DV50ATMA2 datasheet, TLE4276DV50ATMA2 pinout, TLE4276DV50ATMA2 application, or TLE4276DV50ATMA2 equivalent, key selection criteria include dropout voltage at 250 mA (250–500 mV), junction-to-case thermal resistance (4 K/W), AEC-Q100 qualification, RoHS compliance, and PG-TO252-5 heatsink-compatible footprint.

Technical Context

The TLE4276DV50ATMA2 implements a bandgap-referenced control amplifier driving a series pass transistor with saturation control to prevent oversaturation under load. Its internal protection circuits independently monitor overload, overtemperature (shutdown at ~150 °C), and reverse polarity conditions.

It operates across -40 °C to +150 °C junction temperature, supports input voltages from (V_Q + 0.5) V to 40 V, and requires ≥22 µF output capacitance with ESR ≤3 Ω at 10 kHz for stability. The INH pin is low-active and tolerant to -42 V to +45 V.

Key Specifications

Pinout & Package

Package: PG-TO252-5 (D-Pak variant), thermally enhanced with exposed die pad connected to GND for heatsinking. Pin 1: Input (I), Pin 2: Inhibit (INH), Pin 3: Ground (GND), Pin 4: No Connect (N.C.), Pin 5: Output (Q). Heatsink tab electrically tied to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and NCV8664CDT50RKG, the TLE4276DV50ATMA2 delivers optimal balance of AEC-Q100 compliance, thermal performance (4 K/W), and ultra-low shutdown current (<10 µA), making it preferred for compact, thermally constrained engine-bay regulators where reliability is paramount.

Availability

TLE4276DV50ATMA2 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and telematics units requiring stable component supply with automotive-grade qualification and long-term lifecycle support.

Supply support for TLE4276DV50ATMA2 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 robust, AEC-Q100-qualified voltage regulators optimized for automotive power domains - emphasizing thermal resilience, fault tolerance, and long-term reliability in harsh environments.

FAQ

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

The TLE4276DV50ATMA2 requires input voltage ≥5.25 V (V_Q + 0.25 V) to maintain regulation at 400 mA, based on max dropout of 500 mV. At 250 mA, minimum input is 5.25 V; actual start-up threshold is VI ≥4.5 V per operating range table, but full-load regulation begins at ≥5.25 V.

Can the N.C. pin (Pin 4) be used as a heatsink connection?

No. Pin 4 is internally unconnected and must remain floating - it is not electrically tied to the die pad or GND. The exposed thermal pad (heatsink) is connected to Pin 3 (GND) and must be soldered to a dedicated GND copper pour; using Pin 4 for thermal conduction violates the PG-TO252-5 mechanical design and risks shorting.

Does the device require an external voltage divider for the TLE4276DV50ATMA2 variant?

No. The "V50" suffix denotes the fixed 5.0 V output version; the voltage adjust (VA) pin is not functional and corresponds to Pin 4 (N.C.). Only adjustable variants (e.g., TLE4276DV) use Pin 4 as VA input with external resistor divider; this part has no VA functionality.

How does the inhibit function interact with thermal shutdown?

INH takes priority over thermal shutdown: when INH = low, the device enters ultra-low-I_q state regardless of temperature. If INH = high and junction temperature exceeds ~150 °C, thermal shutdown overrides normal operation and forces output disable - independent of INH state. Recovery occurs only after T_j drops below hysteresis threshold (~140 °C) and INH remains high.