36V buck regulators eliminate switch-node ringing

27th June 2016

Nat Bowers

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Datasheet

Reducing EMI, improving power density and enabling operation in deep drop-out conditions, two 36V, 2.1MHz synchronous buck regulators that eliminate switch-node ringing have been announced by Texas Instruments. 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, ADAS and body power-supply systems.

Wettable flank packaging enables post-solder 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 LM53625-Q1 and LM53635-Q1 regulators, these power solutions lower noise and EMI emissions by up to 15dB at the system level, which requires less external EMI filtering, saves PCB area and simplifies compliance with CISPR 25 automotive EMI requirements.

The wide 3.5 to 42V operating range handles start-stop and load-dump conditions for 12V lead acid automotive batteries while a low 18µA quiescent current in standby extends battery life in 'always on' applications. The LM53625-Q1 and LM53635-Q1 provide up to 93% efficiency at 2.1MHz operation to support compact and high-temperature conditions in automotive applications. Deep drop-out performance of less than 0.6V under full load and temperature conditions enables compliance with stringent cold-crank and start-stop conditions, saving system cost and solution size.

The DC/DC regulators are available in volume now from TI and its authorised distributors. Offered in a 22-pin, 4x5mm VQFN package, the LM53625-Q1 is priced at $2.79 in 1,000 unit quantities and the LM53635-Q1 is priced at $3.22 in 1,000 unit quantities.