Synchronous DC-DC buck regulators eliminate switch-node ringing in automotive applications

Texas Instruments has introduced two 36V, 2.1MHz synchronous buck regulators that eliminate switch-node ringing to reduce electromagnetic interference, improve power density, and operate in deep drop-out conditions. The 2.5A LM53625-Q1 and 3.5A LM53635-Q1 regulators are designed for high-voltage DC-DC step-down applications such as automotive infotainment, high-end cluster, advanced driver assistance system and body power-supply systems. Wettable flank packaging enables optical inspection to reduce manufacturing costs. By using these step-down regulators together with TI’s WEBENCH automotive design tool, engineers can get their automotive designs to market faster. Switch node ringing is inherent in all switch-mode power supplies. By reducing parasitic inductance and capacitance in the regulators, these power solutions lower noise and EMI emissions by up to 15dB at the system level, which requires less external EMI filtering, saves printed circuit board area and simplifies compliance with CISPR 25 automotive EMI requirements. These devices join other recently released buck converters to create a complete family of controllers and regulators designed for automotive systems that draw less than 0.65A of power to more than 10A. All of these devices feature greater than 2MHz switching frequency, low operating IQ and EMI reduction features.