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Automotive-compliant synchronous buck converter

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By Jean-Pierre Joosting

Diodes Incorporated has added the DIODES™ AP64060Q to its family of automotive-compliant DC-DC converters. The AP64060Q is a 600 mA synchronous buck converter device with an input voltage range that covers 4.5-V to 40-V. It incorporates a 600 mΩ high-side power MOSFET plus a 300 mΩ low-side power MOSFET so that high-efficiency step-down conversion (reaching 90 percent) can be delivered, and with minimal PCB board space. The AP64060Q is targeted for use in automotive powertrains, infotainment systems, and instrumentation clusters, as well as vehicles’ exterior lighting.

The AP64060Q synchronous buck converter has a very low quiescent current (IQ), typically only 90 μA, which translates into enhanced light load efficiency. Thanks to the fast switching frequencies this device supports (2 MHz), smaller accompanying inductors and capacitors can be selected. Its 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.

The proprietary gate driver scheme employed in the AP64060Q synchronous buck converter 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 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 synchronous buck converter is AEC-Q100 Grade 1 qualified, supports PPAP documentation, and is manufactured in IATF 16949 certified facilities.

www.diodes.com

 

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