Infineon Technologies TLE8366EV33XUMA1

Overview

TLE8366EV33XUMA1 from Infineon Technologies is an automotive-grade 1.8 A synchronous step-down DC/DC voltage regulator with fixed 3.3 V output, ±2% output voltage tolerance, 4.75–45 V input range, and 370 kHz switching frequency. It integrates a power DMOS transistor, features soft-start, input undervoltage lockout, cycle-by-cycle current limiting, and thermal shutdown-designed for engine control units, body electronics, and ADAS power rails.

For engineers reviewing the TLE8366EV33XUMA1 datasheet, TLE8366EV33XUMA1 pinout, TLE8366EV33XUMA1 application, or TLE8366EV33XUMA1 equivalent, this device delivers robust regulation under harsh automotive conditions (T_j = −40 °C to +150 °C), supports external synchronization (200–530 kHz), and enables compact power designs using low-ESR ceramic capacitors and 18–56 µH inductors.

Technical Context

The TLE8366EV33 operates in voltage-mode PWM control with feed-forward line transient rejection, using an internal 0.6 V bandgap reference and error amplifier. Its oscillator generates a 370 kHz sawtooth waveform synchronized via the SYNC pin or free-running when grounded.

Safety functions include cycle-by-cycle overcurrent detection via internal shunt sensing, bootstrap under-voltage monitoring at BDS, output overvoltage protection, and junction temperature shutdown at 175 °C. The integrated charge pump ensures reliable gate drive during low-V_IN/high-duty-cycle operation.

Key Specifications

Pinout & Package

Package: PG-DSO-8 (exposed pad), RoHS-compliant, AEC-Q100 qualified. Exposed pad must be soldered to GND plane with low-inductance vias for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480-Q1 and TPS62130A-Q1, the TLE8366EV33XUMA1 uniquely combines fixed 3.3 V output, 45 V input tolerance, feed-forward line rejection, and AEC-Q100 qualification in a single PG-DSO-8 package-making it optimal for cost-sensitive, thermally demanding primary MCU supplies where simplicity and ruggedness are prioritized over programmability or ultra-high frequency.

Availability

TLE8366EV33XUMA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and infotainment displays requiring stable component supply across automotive production lifecycles.

Supply support for TLE8366EV33XUMA1 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 electronics, and industrial control ICs, with global manufacturing and AEC-Q100 validation infrastructure.

The TLE8366 belongs to Infineon's automotive power regulator product line, engineered specifically for harsh-environment DC/DC conversion in 12 V and 24 V vehicle electrical systems-emphasizing fault resilience, thermal robustness, and functional safety readiness.

FAQ

What is the recommended minimum output capacitance for stable operation?

The datasheet specifies 33–120 µF output capacitance with ESR ≤0.3 Ω. A 47 µF X5R ceramic capacitor (1206 or larger) is recommended for best transient response and low-profile layout. Larger values improve load-step immunity but require verification of soft-start time and compensation stability.

Does TLE8366EV33XUMA1 require an external bootstrap diode?

No external bootstrap diode is required. The internal charge pump automatically engages during low-input-voltage or high-duty-cycle conditions to maintain gate drive, and disables above ~8 V to reduce quiescent current. Only a 100 nF ceramic capacitor between BDS and BUO is needed.

Can the SYNC pin be left floating?

No-SYNC must be tied to GND if not used. A floating SYNC pin may cause erratic switching frequency or increased EMI due to noise coupling. The internal pull-down is insufficient for noise immunity; direct GND connection ensures deterministic free-running operation at 370 kHz.

Is the exposed thermal pad electrically isolated from internal circuitry?

Yes-the exposed pad is internally connected only to GND. It must be soldered to a dedicated GND copper area on the PCB with ≥4 thermal vias (0.3 mm diameter) to ensure both thermal dissipation (R_thJC ≤12 K/W) and low-impedance grounding for noise suppression and safety compliance.