High efficiency low voltage 3A buck converter from Diodes Incorporated

Diodes Incorporated has introduced the automotive-compliant DIODES AP61300Q synchronous buck converters. These 3A-rated devices have a wide input voltage range of 2.4V to 5.5V, and address the need for automotive point-of-loads (POLs) that are more streamlined and exhibit increased efficiency levels. They are optimized for use in vehicles’ telematics, ADAS, power and infotainment systems, as well as instrumentation clusters.

Incorporated into each of these buck converters is a 70mΩ high-side power MOSFET and a 50mΩ low-side power MOSFET which together deliver high-efficiency step-down DC-DC conversion.

With fast switching speeds supported, much smaller accompanying passives can be specified, thereby reducing the overall bill-of-materials (BOM) and saving space.

Depending on the load conditions, the AP61300Q and AP61302Q can be configured to pulse frequency modulation (PFM) or pulse width modulation (PWM) operating modes (using the enable pin). Their quiescent current (IQ) of 19μA, when in PFM mode, allows them to maintain elevated efficiencies even in light load situations. Furthermore, their low drop-out (LDO) mode permits output voltage regulation to be maintained when the input voltage comes close to the VOUT voltage.

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