AP6330x Synchronous Buck Converter

The AP63300 and AP63301 from Diodes Incorporated are 3 A, synchronous buck converters with a wide input voltage range of 3.8 V to 32 V supporting 5 V, 12 V, and 24 V power supplies. Integrated 75 mΩ high-side and a 40 mΩ low-side power MOSFETs provide high-efficiency step-down DC/DC conversion. The AP63300 utilizes pulse frequency modulation (PFM) with a low quiescent current of 22 μA, providing efficiencies up to 88% at 5 mA 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 optimized 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. These devices are available in a low-profile TSOT26 package.