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40V synchronous buck converter reduces EMI with 2MHz switching

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By Nick Flaherty

Diodes has launched an automotive-compliant synchronous buck DC-DC converter with a proprietary gate driver to reduce the EMI effects of high frequency switching.

The AP64060Q is a 600mA, 2MHz synchronous buck converter device with an input voltage range that covers 4.5V to 40V for automotive powertrains, infotainment systems, and instrumentation clusters, as well as vehicles’ exterior lighting.

The DC-DC converter incorporates a 600mΩ high-side power MOSFET plus a 300mΩ low-side power MOSFET so that step-down conversion efficiency reaches 90% with minimal PCB board space.

The AP64060Q has a very low quiescent current (IQ), typically only 90μA, which translates into enhanced light load efficiency, while the fast switching supports smaller accompanying inductors and capacitors.

The synchronous rectification eliminates the need for an external Schottky diode, while use of a peak current mode control and built-in loop compensation network further reduces the overall component count.

A proprietary gate driver scheme employed alleviates switching node ringing without impacting on MOSFET turn-on and turn-off times. This mitigates high frequency radiated electromagnetic interference (EMI) noise caused by the MOSFET switching.

The AP64060Q has an operating ambient temperature range of -40°C to +125°C. Protection features include overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown. This device is supplied in a compact TSOT26 package.

The AP64060Q is available at $0.23 in 1000 piece quantities. It is AEC-Q100 Grade 1 qualified, supports PPAP documentation, and is manufactured in IATF 16949 certified facilities.

www.diodes.com

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