Infineon Launches TLE9744QK PMIC With Integrated Resolver Excitation and Safety Logic
The new power management IC claims to reduce board area by up to 70% by consolidating supply rails and safety functions.
Infineon has introduced the OPTIREG TLE9744QK, a power management integrated circuit (PMIC) designed for high-voltage traction inverters in electric and hybrid vehicles. The device integrates supply rail management, resolver excitation, and a dedicated safety engine into a single package.
What Happened
The TLE9744QK consolidates functions that are typically assembled from discrete components in an inverter ECU. Infineon states that this integration reduces board area by up to 70% for the replaced devices and lowers the overall component count. The chip includes two buck/boost pre-regulators feeding linear post-regulators, along with two trackers, six analog inputs, five digital inputs, and four digital outputs. It also generates the AC excitation signal required for resolver sensors on-chip, eliminating the need for a separate driver and its monitoring circuitry.
The PMIC operates within a voltage range of 4 V to 36 V and a temperature range of -40° C to 150° C, housed in a PG-LQFP-64 package. Quiescent current is specified at 50 µA. Compatible microcontrollers listed include the TRAVEO T1G and AURIX TC2x, TC3x, and TC4x series. Functional and window watchdogs are built into the device.
Why It Matters
A key feature of the TLE9744QK is its Integrated Safety Logic (ISL) block, which operates as a second, independent safety path. The ISL supervises phase currents, DC-link voltage, and the health of the microcontroller and gate drivers. It can determine and enforce a safe state if the main microcontroller fails. To ensure resilience, the ISL has a redundant supply input that keeps it operational even if the main low-voltage supply fails, preventing a single rail fault from compromising the safety path.
Infineon notes that the architecture fulfills ASIL-D requirements and was developed according to ISO 26262 standards. By moving resolver excitation and safety supervision onto a single chip, the design reduces complexity in the inverter ECU, which is critical for maintaining rotor position accuracy and system safety in electric drivetrains.
The Bottom Line
Samples, evaluation boards, reference designs, and documentation are available on request, with the part listed in stock and unit pricing provided on the product page. Infineon has stated that the TLE9744QK is planned to remain available until at least 2038.
