3A Low IQ Synchronous Buck Converter with Best In Class EMI Performance

Monday, November 16, 2020 - 10:15

Diodes Incorporated recently introduced the AP63300 and AP63301 – two 3A synchronous buck converters with a wide input voltage range of 3.8V to 32V, supporting 5V, 12V, and 24V power supplies to the market. The integrated 75mΩ high-side and a 40mΩ low-side power MOSFETs provide high efficiency step-down DC-DC conversion.


The AP63300 utilises Pulse Frequency Modulation (PFM) with a low quiescent current of 22μA, which provides efficiencies up to 88% at 5mA light load. The AP63301 operates in Pulse Width Modulation (PWM) where the switching frequency is fixed regardless of output load for lower output voltage ripple.

Both products are optimised for Electromagnetic Interference (EMI) reduction with a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times. This controlled switching reduces high frequency radiated EMI noise.

The AP63300 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay at any one frequency for a significant period of time.

The devices are available in a low-profile TSOT26 package with the same pin out as the 2-A versions. Should you need either the AP63300 or the AP63301 for your application, contact Andrew Athanasiou on aathanasiou@arrow.altech.co.za for technical advice and orders.




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