Infineon Technologies TLE4276GV50ATMA3

Overview

TLE4276GV50ATMA3 from Infineon is a fixed-output 5.0 V low-dropout linear voltage regulator in PG-TO263-5 package, delivering up to 400 mA output current with ±4% output voltage tolerance, 250–500 mV dropout at 250 mA, and inhibit-controlled shutdown (<10 µA quiescent current). It is AEC-Q100 qualified for automotive power supply rails in engine control units and body electronics.

For engineers reviewing the TLE4276GV50ATMA3 datasheet, TLE4276GV50ATMA3 pinout, TLE4276GV50ATMA3 application, or TLE4276GV50ATMA3 equivalent, key selection criteria include dropout voltage at full load, thermal resistance (R_thj-c = 4 K/W), reverse polarity protection, short-circuit immunity, and AEC-Q100 qualification status for under-hood deployment.

Technical Context

The TLE4276GV50ATMA3 implements a bandgap-referenced control amplifier driving a series pass transistor with saturation control to prevent oversaturation under high load. Protection circuitry includes overtemperature shutdown (T_j > 150 °C), reverse-polarity blocking, and current-limiting (400–1100 mA trip range).

It operates across an input range of 5.5 V to 40 V (V_Q + 0.5 V minimum), supports stable regulation with ≥22 µF/≤3 Ω ESR output capacitance, and achieves 54 dB PSRR at 100 Hz - critical for noise-sensitive microcontroller supply domains in automotive ECUs.

Key Specifications

Pinout & Package

Package: PG-TO263-5 (D²PAK), thermally enhanced surface-mount package with exposed tab connected to GND for low R_thj-c.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and NCP1117ST50T3G, the TLE4276GV50ATMA3 uniquely combines AEC-Q100 Grade 1 qualification, 400 mA capability, inhibit control, and sub-500 mV dropout - making it the only drop-in solution for space-constrained, safety-aware automotive 5 V rails requiring guaranteed reliability.

Availability

TLE4276GV50ATMA3 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera modules requiring stable component supply, automotive qualification, and thermal resilience in high-temperature environments.

Supply support for TLE4276GV50ATMA3 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 leadership in AEC-Q100-qualified analog and power products.

The OPTIREG™ linear product line delivers robust, qualification-ready voltage regulators targeting automotive subsystems where reliability, thermal performance, and functional safety are mandatory design requirements.

FAQ

What is the maximum allowable input voltage for TLE4276GV50ATMA3?

The absolute maximum input voltage is 45 V, but the recommended operating range is 5.5 V to 40 V. Operation above 40 V risks exceeding safe junction temperature limits even with adequate heatsinking, and below 5.5 V fails to maintain regulation due to dropout constraints. The device is designed for 12 V automotive systems including cold-crank (down to ~6 V) and load-dump (up to 40 V) conditions.

Does TLE4276GV50ATMA3 require an external voltage divider for 5 V output?

No. The 'V50' suffix denotes the fixed 5.0 V version; pin 4 (VA) is internally connected and unused. External resistors are only required for the adjustable variant (TLE4276GV). For this part, the output is factory-trimmed to 4.8–5.2 V across temperature and load, eliminating feedback component count and layout sensitivity.

How does the inhibit (INH) pin behave electrically?

The INH pin is low-active: pulling it to GND (≤0.8 V) forces the regulator into ultra-low-power shutdown with total current draw <10 µA. Leaving INH open or applying ≥2.0 V disables shutdown and enables normal regulation. No pull-up resistor is required - internal bias ensures default-enable behavior when unconnected.

Can TLE4276GV50ATMA3 be used without a heatsink in a 400 mA application?

Yes - when mounted on a PCB with ≥80 × 80 mm² of 35 µm copper and soldered to the exposed tab (GND), its R_thj-c = 4 K/W allows full 400 mA operation at 125 °C ambient without external heatsink. At 150 °C junction limit, this configuration supports ~3.5 W dissipation (e.g., 13.5 V_IN → 5 V_OUT, 400 mA → 3.4 W), verified per Infineon's thermal test board conditions.