Infineon Technologies TLE7274D

Overview

TLE7274D from Infineon Technologies is a monolithic 5 V low-dropout linear voltage regulator for automotive load currents up to 300 mA, featuring ±2% output voltage accuracy, ultra-low 20 µA quiescent current, 250 mV typical dropout at 200 mA, stability with 470 nF ceramic output capacitor, and integrated overtemperature shutdown and output current limiting. It operates from 5.5 V to 42 V input and is qualified per AEC-Q100 for under-hood engine control units and body electronics.

For engineers reviewing the TLE7274D datasheet, TLE7274D pinout, TLE7274D application, or TLE7274D equivalent, key selection criteria include its 150°C junction rating, reverse-current sink protection (output clamped ≤5.5 V), charge-pump-based ultra-low-I_Q architecture, and PG-TO252-3 thermal performance with R_thJA as low as 47 K/W using 600 mm² heatsink area.

Technical Context

The TLE7274D employs a charge-pump-assisted bandgap reference and internal current-limiting circuitry to sustain regulation down to 250 mV dropout while maintaining 20 µA quiescent current across -40°C to 150°C. Its output sink capability actively clamps reverse current to prevent overvoltage at Q during battery disconnect or load dump transients.

Stability is achieved with minimal 470 nF ceramic output capacitance (ESR ≤10 Ω at 10 kHz), eliminating need for electrolytic or tantalum capacitors. The device's thermal shutdown activates at ~175°C junction temperature, and short-circuit protection limits peak output current to 800 mA at V_Q = 0 V.

Key Specifications

Pinout & Package

Package: PG-TO252-3 (DPAK), thermally enhanced with exposed heat slug internally connected to GND. Requires PCB copper pour under slug for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V automotive LDO applications.

Compared with TLV73350PDBVR, TLE7274D delivers superior thermal survivability and automotive qualification; compared with TLE42744DV33, it offers smaller footprint and lower dropout at the expense of 100 mA current headroom - ideal for compact, cold-crank-critical ECU sub-rails.

Availability

TLE7274D is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply under automotive qualification and extended temperature operation.

Supply support for TLE7274D 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 ICs, with global manufacturing and qualification infrastructure.

The OPTIREG™ linear regulator product line targets automotive power supply design, emphasizing AEC-Q100 compliance, thermal resilience, and integration of protection features for harsh-environment deployment.

FAQ

What is the minimum input voltage required for regulation at full 300 mA load?

The TLE7274D maintains regulation down to 5.5 V input across its operating temperature range. At 300 mA load and 25°C, the dropout is approximately 400 mV, meaning input must remain ≥5.4 V to sustain 5.0 V output. During cold-crank, where battery voltage may dip to 5.5 V, the device remains functional with marginal headroom - verified per AEC-Q100 transient test profiles.

Can the TLE7274D be used with aluminum polymer or tantalum output capacitors instead of ceramic?

No - the TLE7274D is specifically characterized and guaranteed stable only with ceramic capacitors having 470 nF–10 µF capacitance and ESR ≤10 Ω at 10 kHz. Aluminum polymer and tantalum capacitors exhibit higher ESR and different phase characteristics that may cause oscillation or poor transient response, violating the stability conditions defined in the datasheet.

Does the output sink current function require external components to operate?

No - the output sink circuitry is fully integrated and requires no external components. When reverse current flows into the Q pin (e.g., during battery disconnection or load dump), the internal sink transistor activates automatically to clamp Q voltage to ≤5.5 V, protecting downstream 5 V devices without additional diodes or MOSFETs.

How does the charge-pump architecture impact output noise performance?

The charge pump enables ultra-low 20 µA quiescent current but introduces mV-range switching noise on the output, primarily at ~100 kHz. This makes the TLE7274D unsuitable for ultra-low-noise analog circuits (e.g., precision ADC references); Infineon recommends the TLE42xx or TLE44xx families for such applications, which use low-noise linear topologies without charge pumps.