Infineon Technologies TLE4279GXUMA1

Overview

TLE4279GXUMA1 from Infineon is an automotive-grade 5 V fixed-output linear voltage regulator in PG-DSO-8 package, delivering up to 150 mA load current with ±2% output tolerance, 0.25 V typical dropout at 100 mA, and reset output active down to VQ = 1 V. It integrates early warning via sense input, adjustable reset threshold (1.26–1.44 V internal reference), and thermal shutdown at 150°C - deployed in engine control units, body electronics, and ADAS power domains.

For engineers reviewing the TLE4279GXUMA1 datasheet, TLE4279GXUMA1 pinout, TLE4279GXUMA1 application, or TLE4279GXUMA1 equivalent, key selection criteria include its AEC-Q100 qualification, open-collector reset/sense outputs, external capacitor–programmable reset delay (17–28 ms), reverse-polarity protection, and low-quiescent-current operation (150 µA at 1 mA load).

Technical Context

The TLE4279GXUMA1 employs a bandgap-referenced error amplifier driving a PNP pass transistor, enabling stable 5 V regulation across 6–45 V input range and −40°C to +125°C operating junction temperature. Its integrated reset generator uses a precision comparator with hysteresis to monitor VQ against a trimmed 4.65 V threshold (±0.15 V), while the RADJ pin allows downward adjustment via external divider.

Sense functionality relies on a dedicated comparator comparing SI voltage to dual thresholds (1.16–1.38 V) to generate early warning signals; both RO and SO are open-collector outputs rated for 7 V max, requiring external pull-ups. Thermal protection disables the pass element when T_j exceeds 150°C, and short-circuit current limiting caps peak output at 200 mA typical.

Key Specifications

Pinout & Package

Package: PG-DSO-8 (exposed pad, RoHS-compliant, moisture sensitivity level 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and TLE42754G, the TLE4279GXUMA1 uniquely balances AEC-Q100 compliance, diagnostic flexibility (adjustable reset, early warning), and compact PG-DSO-8 packaging - making it optimal for space-constrained, safety-aware automotive subsystems requiring layered fault detection.

Availability

TLE4279GXUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering sensor interfaces requiring stable component supply across automotive production lifecycles.

Supply support for TLE4279GXUMA1 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 security solutions, with global manufacturing and R&D infrastructure.

The OPTIREG™ Linear product line delivers robust, AEC-Q100-qualified voltage regulators targeting automotive power domains where reliability, diagnostics, and thermal resilience are mandatory.

FAQ

What is the minimum input voltage required for regulation?

The TLE4279GXUMA1 maintains regulation down to VI = 6 V (per datasheet operating range), enabled by its 0.25 V typical dropout voltage. At 100 mA load, this means VQ remains within specification as long as VI ≥ 5.25 V - sufficient to sustain operation during ISO 16750-2 cold-crank pulses to 6 V. Below 6 V, the device enters dropout and VQ tracks VI minus Vdr.

How is the reset delay time calculated?

Reset delay is set by capacitor CD connected between Pin 4 (D) and GND. The internal 6.5 µA current source charges CD; delay t_d ≈ CD × 1.35 V / 6.5 µA. With CD = 100 nF, t_d = 20.8 ms (within 17–28 ms spec). For 50 ms delay, use CD ≈ 240 nF. The upper/lower thresholds (1.4–2.2 V / 0.3–0.6 V) define hysteresis to prevent chatter.

Can the sense input (SI) be left unconnected?

Yes - if early warning functionality is unused, SI must be tied to Q (Pin 8) per datasheet guidance. Floating SI is not permitted due to comparator input bias current; connecting to Q ensures stable bias at VQ and disables sense output (SO) assertion. This avoids unintended SO activation while preserving all other functions including reset generation.

Does the TLE4279GXUMA1 require an external pull-up on the reset output (RO)?

Yes - RO is an open-collector output and requires an external pull-up resistor (typically 4.7–10 kΩ to 5 V or VQ) to assert a logic-high level when inactive. Without it, RO remains floating and cannot interface with standard CMOS inputs. The same applies to SO. Pull-up values are chosen to ensure ≤0.4 V saturation voltage at sink currents up to 5 mA.