Infineon Technologies TLE42744GV33ATMA1

Overview

TLE42744GV33ATMA1 from Infineon Technologies is an AEC-Q100 qualified monolithic low-dropout linear voltage regulator delivering a precise 3.3 V ±2% output at up to 400 mA, with input voltage range 4.7–40 V and dropout voltage as low as 250 mV at 400 mA. It features reverse polarity protection, thermal shutdown, current limiting, and operates from −40 °C to +150 °C junction temperature-designed for permanent battery-connected automotive ECUs such as body control modules and sensor interfaces.

For engineers reviewing the TLE42744GV33ATMA1 datasheet, TLE42744GV33ATMA1 pinout, TLE42744GV33ATMA1 application, or TLE42744GV33ATMA1 equivalent, key selection criteria include its PG-TO263-3 package thermal performance (R_thJA = 22 K/W on 2s2p board), 22 µF minimum output capacitance requirement, ±2% output accuracy, and integrated protection against short circuit and overtemperature faults in harsh automotive environments.

Technical Context

The TLE42744GV33ATMA1 implements a bandgap-referenced control amplifier driving a pass transistor with saturation control logic, enabling stable regulation under wide input transients and load steps. Its protection architecture integrates independent current-sensing and die-temperature monitoring circuits that trigger fast shutdown without latch-up.

Designed for direct connection to vehicle battery (VBAT), it maintains regulation down to 4.7 V input while sustaining 400 mA output-critical for start-stop and cold-crank conditions. The device uses internal GND-referenced heat slug and requires external ceramic output capacitor (22 µF, ESR ≤3 Ω) for stability per functional range specifications.

Key Specifications

Pinout & Package

PG-TO263-3 (D2PAK) package with exposed heat slug internally connected to GND; requires PCB copper pour and thermal vias for optimal thermal performance (R_thJA = 22 K/W on 2s2p board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TLV73333PDBVR and NCP1117ST33T3G, the TLE42744GV33ATMA1 uniquely combines AEC-Q100 Grade 0 qualification, integrated reverse polarity protection, and 400 mA capability in PG-TO263-3-making it the only drop-in solution for production automotive ECUs requiring single-chip 3.3 V regulation under ISO 7637-2 stress.

Availability

TLE42744GV33ATMA1 is available at Aetrix Electronics and suitable for body control modules, engine sensor interfaces, ADAS camera modules, and infotainment subsystems requiring stable component supply across automotive production lifecycles.

Supply support for TLE42744GV33ATMA1 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 security solutions, with global manufacturing and qualification infrastructure.

The TLE42744 belongs to Infineon's automotive linear regulator product line, engineered specifically for permanent battery-connected vehicle ECUs demanding ultra-low quiescent current, high thermal robustness, and integrated fault protection.

FAQ

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

The TLE42744GV33ATMA1 maintains regulation down to 4.7 V input at 400 mA load, as specified in Table 2 (Functional Range). This enables reliable operation during automotive cold-crank events where battery voltage dips below 6 V. Below 4.7 V, output voltage drops linearly with input; no undervoltage lockout is implemented.

Can the heat slug be left unconnected on the PCB?

No-the heat slug is internally connected to GND and must be soldered to a dedicated PCB copper pour with ≥6 thermal vias (0.3 mm diameter) to achieve rated 400 mA output. Leaving it unconnected raises junction temperature by >50 °C at full load and risks premature thermal shutdown or long-term reliability degradation.

Is an input capacitor mandatory, and what type is recommended?

Yes-a 100 nF X7R ceramic capacitor is mandatory between Pin 1 (I) and Pin 2 (GND), placed within 3 mm of the IC. This suppresses high-frequency noise and prevents oscillation during load transients. Tantalum or electrolytic capacitors are not recommended due to ESR and aging effects that compromise stability.

Does the device support adjustable output voltage via external resistors?

No-the TLE42744GV33ATMA1 is a fixed-output regulator with internal feedback network set to 3.3 V. It does not provide an adjust pin or external resistor option. For adjustable output, consider Infineon's TLE4275 series, which offers external feedback configuration but with different protection and thermal characteristics.