Infineon Technologies TLE42644GHTMA1

Overview

TLE42644GHTMA1 from Infineon is a monolithic low-dropout linear voltage regulator delivering a fixed 5 V ±2% output up to 50 mA and 5 V ±3% up to 100 mA, with typ. 40 µA quiescent current, dropout voltage as low as 220 mV at 100 mA, and AEC-Q100 qualification for automotive use in battery-connected modules.

For engineers reviewing the TLE42644GHTMA1 datasheet, TLE42644GHTMA1 pinout, TLE42644GHTMA1 application, or TLE42644GHTMA1 equivalent, key selection criteria include ultra-low standby current, reverse polarity protection, overtemperature shutdown threshold of 151–200°C, input voltage range up to 45 V, and PG-SOT223-4 thermal performance (R_thJC = 17 K/W).

Technical Context

The TLE42644GHTMA1 integrates bandgap reference, error amplifier, saturation control, and thermal shutdown circuitry in a single die. Its architecture enables stable regulation under wide input (5.5–40 V) and junction temperature (-40°C to +150°C) ranges while maintaining <90 mV load regulation and 68 dB PSRR at 100 Hz.

Protection functions include output current limiting (150–500 mA trip), reverse polarity protection, and hysteresis-enabled overtemperature shutdown (25°C hysteresis). The device operates without external compensation when paired with ≥10 µF output capacitor having ESR ≤2 Ω at 10 kHz.

Key Specifications

Pinout & Package

Supplied in PG-SOT223-4 package: surface-mount, thermally enhanced, with exposed heat slug internally connected to GND. Requires ceramic input/output capacitors placed adjacent to pins per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current automotive LDO applications.

Compared with TLE4264G and TLV73350PDBVR, the TLE42644GHTMA1 uniquely combines AEC-Q100 Grade 0 qualification, 40 µA quiescent current, and PG-SOT223-4 thermal performance-making it the sole option for high-reliability, long-duration automotive standby applications.

Availability

TLE42644GHTMA1 is available at Aetrix Electronics and suitable for body control modules, ADAS camera power supplies, engine sensor interfaces, and electric power steering logic circuits requiring stable component supply across automotive production lifecycles.

Supply support for TLE42644GHTMA1 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 industrial control solutions, with global manufacturing and AEC-Q100 validation infrastructure.

The OPTIREG™ linear product line delivers robust, qualified voltage regulators for automotive subsystems demanding ultra-low I_q, extended temperature operation, and integrated fault protection-designed specifically for ECU, BCM, and ADAS power domains.

FAQ

What is the minimum input voltage required for regulation at full 100 mA load?

The TLE42644GHTMA1 maintains regulation down to an input voltage of 5.22 V at 100 mA load, based on its maximum dropout voltage of 500 mV (VI – VQ). At 220 mV typical dropout, regulation holds from VI ≥ 5.22 V, enabling operation during automotive cold-crank events where battery voltage dips to ~6 V.

Can this regulator be used without an output capacitor?

No. An output capacitor of ≥10 µF with ESR ≤2 Ω at 10 kHz is mandatory for stability, as confirmed in the functional range table and stability region plots. Omitting it causes oscillation and unregulated output, especially under dynamic load changes common in MCU-based systems.

Is the heat slug electrically isolated or connected internally?

The heat slug (Pin 4) is internally connected to GND and the leadframe. It must be soldered to a PCB ground plane or heatsink area to ensure both electrical safety and thermal performance-R_thJC = 17 K/W is measured to this slug, and isolation voids thermal specs and safety certification.

Does the overtemperature shutdown feature automatically recover after cooling?

Yes. The device implements hysteresis: it shuts down at 151–200°C and resumes regulation only after junction temperature falls by ≥25°C. This prevents rapid cycling during transient overheating and ensures safe restart once thermal margin is restored, as verified in the electrical characteristics table (T_j,sdh parameter).