Infineon Technologies TLE4268GXUMA2

Overview

TLE4268GXUMA2 from Infineon Technologies is a 5-V low-drop fixed-voltage regulator with integrated watchdog, reset generator, reverse polarity protection, and overtemperature shutdown. It delivers ≥180 mA output current, supports 5.5–45 V input, maintains ±2% output voltage tolerance, and operates across −40 °C to +150 °C for automotive power rail conditioning in engine control units.

For engineers reviewing the TLE4268GXUMA2 datasheet, TLE4268GXUMA2 pinout, TLE4268GXUMA2 application, or TLE4268GXUMA2 equivalent, key selection criteria include reset threshold adjustability (via RADJ), watchdog activation threshold (≥8 mA load), reset delay tuning (external capacitor), and PG-DSO-8 package thermal resistance (R_thj-a = 185 K/W).

Technical Context

The device uses a bandgap-referenced control amplifier to regulate output voltage, with saturation control preventing series transistor overdrive. Its reset generator monitors scaled output voltage at RADJ; when below 1.35 V, it discharges an external capacitor until V_DRL (0.2–0.55 V) triggers a low-active open-collector reset on RO.

Watchdog logic activates only above 8 mA load current and responds to positive edges on W, generating reset pulses with adjustable period (30–75 ms at C_D = 100 nF). Protection circuits enforce reverse polarity blocking, short-circuit current limiting, and thermal shutdown at >150 °C junction temperature.

Key Specifications

Pinout & Package

PG-DSO-8 (8-pin plastic dual small outline) package with exposed thermal pad; RoHS-compliant, AEC-Q100 qualified, green product.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and MAX16910ATA+T, TLE4268GXUMA2 uniquely combines AEC-Q100 qualification, internal 30 kΩ RO pull-up, and load-gated watchdog in PG-DSO-8-reducing BOM count and layout complexity for entry-level automotive ECUs.

Availability

TLE4268GXUMA2 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and infotainment system core rails requiring stable component supply with automotive-grade reliability and traceable sourcing.

Supply support for TLE4268GXUMA2 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 automotive qualification leadership.

TLE4268GXUMA2 belongs to Infineon's TLE family of automotive voltage regulators-designed specifically for robust 5 V power conditioning in harsh-temperature, high-voltage automotive environments with integrated safety monitoring.

FAQ

What is the minimum input voltage required for regulation?

The TLE4268GXUMA2 begins regulating at 5.5 V input and maintains 5.0 V ±2% output down to this threshold under load. Below 5.5 V, output drops linearly with input. The 0.25 V typical dropout ensures reliable operation during cold-crank events where battery voltage dips to 6 V while powering downstream 5 V logic.

How is the reset delay time adjusted?

Reset delay is set by connecting an external capacitor between pin 5 (D) and GND. With a 100 nF capacitor, delay is 10–25 ms (typ. 15 ms); larger values increase delay linearly. The capacitor charges through an internal 5–18 μA current source and triggers reset when voltage crosses 0.2–0.55 V lower threshold (V_DRL).

Does the watchdog require a specific pulse frequency?

Yes-the watchdog input (pin 7) expects positive-edge pulses with period ≤75 ms (i.e., ≥13.3 Hz) to prevent reset assertion. Pulse width must exceed 25 ns, and slew rate must be ≥5 V/μs. Testing confirms reliable operation up to 10 kHz, making it compatible with standard MCU timer outputs.

Can the reset output drive a microcontroller's NRST pin directly?

Yes-RO is an open-collector output with internal 30 kΩ pull-up to V_Q, capable of sinking ≥1 mA at 0.5 V. It meets standard CMOS/NMOS reset input requirements. For faster rise times or stronger drive, add an external 4.7 kΩ pull-up to V_CC of the target MCU, ensuring compatibility with 1.8–5 V logic families.