Synchronous DC/DC buck regulators eliminate switch-node ringing in vehicles

Two 36V, 2.1MHz synchronous buck regulators from Texas Instruments eliminate switch-node ringing to reduce EMI. They also improve power density, and operate in deep drop-out conditions, says the company.

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 (ADAS) and body power-supply systems. Another feature to note is the wettable flank packaging, which enables optical inspection to reduce manufacturing costs.

By reducing parasitic inductance and capacitance in the regulators, they 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.

Both regulators have a wide 3.5 to 42V operating range, to handle start-stop and load-dump conditions for 12V lead acid automotive batteries.

They provide up to 93% efficiency at 2.1MHz operation to support compact and high-temperature conditions in automotive applications. The low quiescent current (IQ) of 18microA in standby extends battery life in always-on 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 claims the company.

An Infotainment Power System Reference Design includes the LM53635-Q1 regulator, LM27313-Q1 boost converter and LM74610-Q1 smart diode controller. The reference design for the automotive sector meets all industry tests including ISO 7637 pulse, cold crank, reverse battery, input over-voltage and CISPR 25 Class 5-conducted EMI.

The DC/DC regulators are available now in a 22pin, 4.0 x 5.0mm, very thin, quad flat, no-lead (VQFN) package.

They can be used with the company’s Webench Automotive Design tool.


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