Infineon Technologies TLF35585QUS02XUMA1

Overview

TLF35585QUS02 from Infineon is a functional safety-certified PMIC for automotive ASIL-D systems, integrating a boost-buck pre-regulator (3.0–40 V input), 3.3 V/600 mA MCU main supply (QUC), 5.0 V/200 mA communication rail (QCO), ±1% 5.0 V/150 mA ADC reference (QVR), two 150 mA trackers (QT1/QT2), and 3.3 V/10 mA standby regulator (QST). It supports electric power steering and traction inverter control under extended junction temperature up to 175°C.

For engineers reviewing the TLF35585QUS02 datasheet, TLF35585QUS02 pinout, TLF35585QUS02 application, or TLF35585QUS02 equivalent, key selection criteria include ISO 26262 ASIL-D compliance, dual watchdog architecture (window + functional), SPI-based configuration, safe state control with programmable delay, and AEC-Q100 Grade 0 qualification.

Technical Context

The TLF35585QUS02 implements a serial step-up/step-down pre-regulator architecture enabling stable operation across 3.0–40 V battery transients while minimizing overall power loss. Its post-regulation stage delivers tightly regulated outputs: QUC (3.3 V/600 mA) for microcontroller core logic, QCO (5.0 V/200 mA) for CAN/FlexRay transceivers, and QVR (5.0 V ±1%/150 mA) as precision ADC reference.

Supervision includes independent voltage monitoring blocks, error pin monitoring, configurable window watchdog (time-triggered) and functional watchdog (question-answer protocol), plus two safe state outputs (SS1/SS2) with programmable delay for fail-safe MCU coordination. All functions are accessible via 16-bit SPI with interrupt and reset signaling.

Key Specifications

Pinout & Package

TLF35585QUS02 is housed in a PG-TQFP-48-10 package (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced for high-power density automotive environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar functional safety PMIC applications.

Compared with FS26 and ISL78310, the TLF35585QUS02 uniquely combines 40 V input tolerance, integrated boost-buck pre-regulation, dual sensor trackers, and full ASIL-D certification-enabling single-chip power and safety management for demanding traction and steering ECUs.

Availability

TLF35585QUS02 is available at Aetrix Electronics and suitable for electric power steering, battery management, and traction inverter applications requiring stable component supply across automotive production lifecycles.

Supply support for TLF35585QUS02 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 leadership in functional safety and high-temperature reliability.

The OPTIREG™ PMIC product line targets automotive safety-critical ECUs, delivering integrated power regulation, supervision, and ASIL-D compliance in compact packages for engine, chassis, and electrification systems.

FAQ

What is the maximum allowable input voltage transient for TLF35585QUS02?

The device supports 40 V continuous input and tolerates 43.5 V for up to 10 seconds during load dump events, as specified in Absolute Maximum Ratings Table 1. This rating is valid independent of voltage slew rate, making it suitable for 12 V and 24 V commercial vehicle systems without external clamping.

How does the functional watchdog differ from the window watchdog?

The functional watchdog uses a challenge-response protocol where the MCU must return a correct answer to a time-varying question sent via SPI; failure triggers immediate safe state activation. The window watchdog monitors SPI activity timing only-requiring commands within defined upper and lower time bounds-to detect software hangs without requiring cryptographic exchange.

Can QT1 and QT2 supply different sensor types simultaneously?

Yes-QT1 and QT2 are independently buffered, each capable of sourcing 150 mA while tracking QVR voltage. They support mixed sensor loads (e.g., QT1 for RTD bridge excitation, QT2 for Hall-effect sensor bias) with matched tracking accuracy (<0.1% deviation), critical for differential measurement integrity.

Is external compensation required for the boost-buck pre-regulator?

No-internal compensation is factory-trimmed for stability across all operating conditions. The pre-regulator uses adaptive control and fixed-frequency operation (configurable between 200 kHz and 2 MHz via FRE pin), eliminating need for external RC networks or loop tuning during design-in.