Infineon Technologies TLE42794GXUMA1

Overview

TLE42794GXUMA1 from Infineon is a monolithic low-dropout linear voltage regulator delivering a precise 5.0 V ±2% output at up to 150 mA, featuring integrated power-on/undervoltage reset with programmable delay, early warning sense comparator, and reverse polarity protection. It operates across -42 V to +45 V input range and supports automotive systems requiring robust 5 V supply with fault monitoring.

For engineers reviewing the TLE42794GXUMA1 datasheet, TLE42794GXUMA1 pinout, TLE42794GXUMA1 application, or TLE42794GXUMA1 equivalent, key selection criteria include its adjustable reset threshold (down to 4.65 V typ), reset output low down to VQ = 1 V, dropout voltage < 0.5 V at 150 mA, and AEC-Q100 qualification for under-hood use.

Technical Context

The TLE42794GXUMA1 implements a saturation-controlled series transistor driven by an error amplifier comparing a trimmed reference to a resistive feedback of the output. Its reset function uses an internal comparator with externally adjustable threshold via RADJ and programmable delay via capacitor on D pin.

The device integrates dual open-collector outputs: RO for reset signaling and SO for early warning, both requiring external pull-up resistors. Protection circuits include current limiting, overtemperature shutdown, and reverse polarity tolerance - all designed for sustained operation in harsh automotive environments from −40 °C to +150 °C.

Key Specifications

Pinout & Package

Package: PG-DSO-8 (8-pin exposed pad SOIC variant, RoHS-compliant, thermal pad for enhanced dissipation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE42694G, TLE42794GXUMA1 offers design flexibility via external pull-up control and tighter reset threshold adjustment; versus TLV73350PDBVR, it delivers full automotive-grade fault coverage at the cost of higher quiescent current and larger footprint.

Availability

TLE42794GXUMA1 is available at Aetrix Electronics and suitable for Body Control Modules, Engine Control Units, Transmission Control Units, and ADAS Camera ECUs requiring stable component supply with automotive-grade reliability and long-term lifecycle support.

Supply support for TLE42794GXUMA1 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, and industrial control ICs, with global manufacturing and automotive qualification infrastructure.

The OPTIREG™ Linear product line delivers robust, AEC-Q100-qualified linear regulators optimized for automotive subsystems demanding high reliability, wide input range, and integrated supervision functions.

FAQ

What is the minimum input voltage required for regulation?

The TLE42794GXUMA1 regulates down to V_IN = V_OUT + V_DROP, with typical dropout ≤0.45 V at 150 mA. Thus, regulation is maintained at input voltages ≥5.45 V under full load. At lighter loads, dropout decreases - e.g., ~0.2 V at 50 mA - enabling stable operation even during partial cold-crank conditions.

Can the reset output (RO) drive a microcontroller's NMI pin directly?

Yes, RO is an open-collector output rated for 10 mA sink current and compatible with standard 5 V logic inputs. However, an external pull-up resistor to V_Q (not V_BAT) is mandatory, and the value must be selected per datasheet guidelines (typically 4.7 kΩ–10 kΩ) to ensure valid logic-high levels and avoid excessive current during reset assertion.

How does the early warning (SO) function differ from the reset (RO) output?

SO asserts low when the voltage at SI falls below a user-adjustable threshold (set via RADJ), typically configured to trigger 50–100 ms before RO activates. This provides advance warning of incipient undervoltage, allowing firmware to save state or throttle activity before hard reset occurs - a critical capability for deterministic fail-safe behavior in ASIL-B systems.

Is the exposed thermal pad electrically connected internally?

No, the exposed pad on the PG-DSO-8 package is not electrically connected to any internal node. It serves solely for thermal conduction and must be soldered to a large copper pour tied to GND for optimal heat dissipation and junction temperature control - especially critical at 150 mA load in high ambient environments.