Infineon Technologies TLF35585QVS01XUMA1

Overview

TLF35585QVS01 from Infineon is a functional safety-certified PMIC for ASIL D automotive systems, integrating a boost-buck pre-regulator (3.0–40 V input), 5.0 V/600 mA microcontroller main supply (QUC), 5.0 V/200 mA communication supply (QCO), ±1% 5.0 V/150 mA ADC reference (QVR), two 150 mA voltage trackers (QT1/QT2), and 5.0 V/10 mA standby rail (QST). It supports electric power steering and traction inverter control.

For engineers reviewing the TLF35585QVS01 datasheet, TLF35585QVS01 pinout, TLF35585QVS01 application, or TLF35585QVS01 equivalent, key selection criteria include AEC-Q100 Grade 0 qualification, 175°C junction temperature operation, ISO 26262 SEooC compliance up to ASIL D, dual watchdog architecture (window + functional), and SPI-controlled safe state management with programmable delay.

Technical Context

The TLF35585QVS01 implements a serial step-up/step-down pre-regulator architecture to maintain stable output across wide battery transients (3.0–40 V), feeding three independent LDO post-regulators with tight regulation and low dropout. Its supervision subsystem includes independent voltage monitoring blocks, error-pin monitoring, and configurable window (time-based) and functional (challenge-response) watchdogs.

It features PRO-SIL™ certification as a Safety Element out of Context per ISO 26262, enabling integration into ASIL D systems without requiring full re-qualification. The 16-bit SPI interface enables real-time configuration of safe states, watchdog timeouts, and monitoring thresholds, while supporting synchronized switching via SYNC_OUT and external core regulator enable (VEVC).

Key Specifications

Pinout & Package

TLF35585QVS01 is housed in a PG-VQFN-48-79 package (7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad), optimized for high-power density and thermal dissipation in automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NXP FS26 and Renesas ISL783xx, TLF35585QVS01 uniquely combines ASIL D SEooC certification, 40 V input capability with integrated boost-buck, 175°C operation, and dual tracker outputs-making it optimal for next-generation traction and steering domain controllers where thermal resilience and functional safety co-design are mandatory.

Availability

TLF35585QVS01 is available at Aetrix Electronics and suitable for electric power steering, battery management, and traction inverter applications requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 Grade 0 compliance.

Supply support for TLF35585QVS01 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 safety-critical systems, with leadership in automotive-grade PMICs and silicon carbide solutions.

The OPTIREG™ PMIC product line targets functional safety–critical automotive domains-including EPS, BMS, and domain controllers-by integrating high-efficiency regulation, comprehensive supervision, and ISO 26262-ready safety assets in single-chip solutions.

FAQ

What is the maximum allowable input voltage transient for TLF35585QVS01?

The device supports 40 V continuous input and tolerates 43.5 V for up to 10 seconds during lifetime, plus 60 V for 1 hour if slew rate remains below 6 V/ms. These ratings are validated per AEC-Q100 stress tests and documented in Absolute Maximum Ratings Table 1 of the datasheet Rev. 2.01.

Does TLF35585QVS01 support external core voltage monitoring?

Yes. Pin VVCI accepts an external core supply voltage (e.g., 1.3 V MCU core rail) for monitoring, and VEVC provides an enable signal to control that external regulator. This allows coordinated safe shutdown when core voltage deviates outside defined windows, as configured via SPI registers.

How does the functional watchdog differ from the window watchdog?

The window watchdog uses time-based timeout (programmable window), while the functional watchdog operates via challenge-response: the MCU must return a correct response to a dynamically generated question within a defined interval. This prevents both stuck-code and malicious firmware corruption scenarios, satisfying ASIL D diagnostic coverage requirements.

Is thermal pad soldering required for reliable operation?

Yes. The exposed thermal pad (PG-VQFN-48-79 package) must be soldered to a PCB thermal plane using minimum 8×8 mm² copper area and ≥6 thermal vias. This is mandatory to achieve 175°C junction temperature operation and meet AEC-Q100 Grade 0 thermal performance specifications.