Infineon Technologies TLE9243QKXUMA1

Overview

TLE9243QKXUMA1 from Infineon Technologies is a transmission power management IC designed for automotive transmission control units (TCUs), integrating dual-mode pre-regulators (buck/boost), three 5 V trackers, three 9 V LDOs for wheel speed sensors, three high-side drivers for external n-channel MOSFETs, SPI interface (32-bit, 10 MHz, 8-bit CRC), and ASIL-D–compliant safety monitoring. It operates across 3.0–40 V input, supports standby/normal/after-run modes, and targets electro-hydraulic automatic, dual-clutch, and CVT systems.

For engineers reviewing the TLE9243QKXUMA1 datasheet, TLE9243QKXUMA1 pinout, TLE9243QKXUMA1 application, or TLE9243QKXUMA1 equivalent, key selection criteria include ISO 26262 ASIL-D compliance, 175°C junction temperature rating, integrated wheel speed sensor interface with 9 V LDOs, configurable window/functional watchdog, and support for post-power-down stop-counter functionality in after-run mode.

Technical Context

The TLE9243QKXUMA1 implements a serial step-up/step-down pre-regulator architecture with independent 440 kHz boost and 2.2 MHz buck switching frequencies, feeding dedicated post-regulators for MCU (800 mA), communication (240 mA), reference (150 mA), and two sensor tracker rails (150 mA each). Its safety architecture includes dual-path monitoring: one path supervises supply integrity and microcontroller health, while a separate path controls three external n-channel MOSFETs via high-side drivers with charge pump support for active reverse polarity protection.

It embeds a three-channel wheel speed sensor interface with integrated signal conditioning and fault detection, compliant with ASIL-B requirements, and interfaces with host MCUs via a robust 32-bit SPI with 8-bit CRC. The device's after-run mode enables time-limited operation post-ignition-off using an internal stop counter, supporting diagnostic logging and valve hold functions in transmission systems.

Key Specifications

Pinout & Package

Package: PG-VQFN-48-51 (4.5 mm × 6.0 mm, 0.5 mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transmission power management applications.

Compared with MAX20420ATPA/VY+ and TPS65381A-Q1, the TLE9243QKXUMA1 uniquely integrates buck+boost pre-regulation, ASIL-D safety architecture, 175°C operation, and transmission-specific peripherals (WSS interface, after-run timer, charge-pump drivers), making it the only single-package solution for next-generation high-integrity TCUs.

Availability

TLE9243QKXUMA1 is available at Aetrix Electronics and suitable for electro-hydraulic automatic transmissions, dual-clutch transmissions, and continuously variable transmission systems requiring stable component supply, long-term automotive lifecycle support, and ASIL-D–compliant power management.

Supply support for TLE9243QKXUMA1 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and safety-critical systems, with global R&D and manufacturing infrastructure.

The TLE9243QKXUMA1 belongs to Infineon's TLE92x0 transmission power management family, engineered specifically for ASIL-D–compliant TCU designs requiring integrated power regulation, sensor interface, and fail-safe driver control in extreme under-hood environments.

FAQ

What is the maximum allowable input voltage transient for TLE9243QKXUMA1?

The device is rated for continuous operation from 3.0 V to 40 V and withstands load-dump transients up to 45 V for 400 ms per ISO 7637-2 Pulse 5a. Its internal pre-regulator architecture and overvoltage clamping ensure reliable function during alternator regulation faults without external TVS diodes.

Does TLE9243QKXUMA1 support daisy-chained SPI communication?

Yes - the 32-bit SPI interface supports daisy-chaining via dedicated CSB (chip select bar) and MISO/MOSI lines. Up to four devices can be cascaded using a single MCU SPI port, with individual register access enabled by addressable command framing and CRC validation per frame.

How does the after-run mode interact with the stop counter?

The stop counter is a 16-bit decrementing timer activated in after-run mode. It starts counting down from a programmable value (e.g., 30,000 ticks at 1 kHz) upon ignition-off detection. When it reaches zero, the device enters deep sleep, disabling all regulators and drivers except the battery switch to maintain <10 µA quiescent current.

Can the 9 V WSS LDOs be used for non-wheel-speed sensors?

Yes - each 9 V LDO delivers up to 50 mA with ±3% accuracy and thermal foldback. They are electrically suitable for any active sensor requiring 9 V bias (e.g., crankshaft position sensors, camshaft sensors), though diagnostic features like short-circuit detection are calibrated specifically for wheel speed sensor signal profiles.