Infineon Technologies TLE8366EV50XUMA1

Overview

TLE8366EV50XUMA1 from Infineon Technologies is a 1.8 A automotive-grade PWM step-down DC/DC voltage regulator in PG-DSO-8 package with exposed pad, delivering fixed 5.0 V output at ±2% tolerance, operating from 4.75 V to 45 V input, and featuring 370 kHz switching frequency, synchronization input, and soft-start. It integrates a power DMOS transistor and supports harsh environments with junction temperature range of −40 °C to +150 °C.

For engineers reviewing the TLE8366EV50XUMA1 datasheet, TLE8366EV50XUMA1 pinout, TLE8366EV50XUMA1 application, or TLE8366EV50XUMA1 equivalent, key selection criteria include input voltage range (4.75–45 V), fixed 5.0 V output accuracy, thermal shutdown behavior, enable logic polarity, and bootstrap capacitor requirements for high-side gate drive.

Technical Context

The TLE8366EV50XUMA1 implements voltage-mode PWM regulation with feed-forward control to achieve fast line transient rejection across 8–36 V input range. Its oscillator supports external synchronization (200–530 kHz) and generates a saw-tooth waveform for PWM comparison against the error amplifier output.

It integrates cycle-by-cycle current limiting, over-temperature shutdown (trip at 175 °C), input undervoltage lockout, and bootstrap under-voltage protection. The soft-start ramp generator limits inrush current, while the 600 mV internal reference enables precise feedback control for the fixed 5.0 V version via direct FB-to-output connection.

Key Specifications

Pinout & Package

Package: PG-DSO-8 with exposed thermal pad (requires low-inductance GND and heatsink connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2678SD-5.0/NOPB and TPS54360DGQ, the TLE8366EV50XUMA1 delivers automotive-specific reliability (AEC-Q100, 45 V max input, 150 °C Tj), integrated power stage, and synchronization-making it optimal for space-constrained, safety-critical vehicle subsystems where qualification and robustness are mandatory.

Availability

TLE8366EV50XUMA1 is available at Aetrix Electronics and suitable for body control modules, engine control units, transmission control units, and ADAS camera modules requiring stable component supply across automotive production lifecycles.

Supply support for TLE8366EV50XUMA1 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, and industrial control ICs, with global manufacturing and AEC-Q100 validation infrastructure.

The TLE8366 belongs to Infineon's automotive power regulator product line, designed specifically for robust, high-temperature DC/DC conversion in engine, chassis, and comfort electronics where input transients and thermal stress are routine.

FAQ

What is the minimum input voltage required for stable 5.0 V output regulation?

The TLE8366EV50XUMA1 maintains regulation down to 4.75 V input across its full load and temperature range. Below this threshold, undervoltage lockout disables switching to protect downstream circuitry. This ensures compatibility with automotive cold-crank conditions where battery voltage can dip to 4.5 V for short durations.

How is thermal performance affected by the exposed pad connection?

The PG-DSO-8 exposed pad must be soldered to a large copper pour tied to GND with ≥6 thermal vias. Without this, junction-to-ambient thermal resistance rises from 52 K/W to >80 K/W, risking thermal shutdown above 1.2 A at 85 °C ambient. Proper pad connection enables full 1.8 A operation up to +105 °C ambient.

Can the TLE8366EV50XUMA1 be synchronized to an external clock source?

Yes-pin 1 (SYNC) accepts TTL/CMOS-compatible square-wave signals from 200 kHz to 530 kHz. External synchronization eliminates beat frequencies in multi-regulator systems and reduces EMI peaks. When unused, SYNC must be tied to GND; floating this pin causes erratic switching and potential instability.

What compensation components are required for stable operation?

A Type II compensation network (resistor + capacitor in series, plus optional capacitor to ground) is required between COMP (pin 3) and GND. Typical values are R = 10 kΩ, C1 = 1 nF, C2 = 10 nF. Values depend on inductor (18–56 µH) and output capacitor (33–120 µF) selection; stability must be verified via phase margin measurement at worst-case load and temperature.