To solve electric vehicle EMI and noise, TI introduces voltage regulators and ultra-low noise LDOs with integrated capacitors

     The field of power electronics has received renewed attention in recent years as systems such as electric vehicles have grown in popularity. Since many of the subsystems in EVs that affect efficiency, cost, and weight are power electronics-related, improved power solutions are necessary to ensure EVs maintain high performance and low prices in the future.

     Texas Instruments has released two new buck converter solutions, the LMQ66430 and LMQ66430-Q1, both 36V-3A power converters designed to mitigate EMI and noise in industrial and automotive applications. Notably, the converter can help reduce system EMI by integrating two input bypass capacitors and a startup capacitor on the package.by integrating passive components, the high di/dt current loops typically present in such switching applications are reduced. In addition, the reduced loop inductance can also support timing-critical switching elements such as GaN transistors.

     “In the LMQ66430, integrating these passives allows us to control the loop inductance to reduce EMI,” explains Morroni. “Furthermore, in the case of high-speed GaN switches, this allows us to drive the switches faster for higher efficiency.” In addition to this, the buck converter has a quiescent current (Iq) of 1.5µA, which means The leakage current of the system is smaller when it is turned off.

     Another product is the TPS7A94, a new low dropout (LDO) linear regulator designed for very low noise performance. The new LDO is used in extremely noise-sensitive devices and delivers ultra-low output noise of 0.46µVRMS, a figure TI claims is 46% better than the competition. Additionally, to help isolate downstream components from upstream noise, the TPS7A94's PSRR (Power Supply Ripple Rejection) is 100 dB at 1 kHz and 60 dB at 1 MHz.
     Discussing the new LDO, Chin said, "With the TPS7A94, we're actually adjusting the two main sources of noise on the power rails. First, we reduce the noise generated by the LDO to industry-leading levels. Second, we provide a very good high PSRR performance to clean up noise from the upstream power supply.”