Diodes Incorporated High Efficiency Buck Converters Offer Various POL Design Diversity

【Lansheng Technology Information】On May 11, Diodes Incorporated announced the launch of new products in its synchronous buck converter portfolio. The continuous output current ratings of the AP62500 and AP62800 are 5A and 8A, respectively, giving engineers more flexibility when developing point-of-load (POL) solutions optimized for efficiency or size.

Both of Diodes' buck converters feature a wide input voltage range: the AP62500 covers 4.5V to 18V and the AP62800 covers 4.5V to 17V (both for 5V and 12V rail product applications), and both output voltages are adjustable down to 0.6V. A choice of three different switching frequencies (400kHz, 800kHz and 1.2MHz) allows engineers to prioritize conversion efficiency or focus on small form factors. Additionally, these devices have three modes of operation to choose from; Pulse Frequency Modulation (PFM) to improve light load efficiency, Pulse Width Modulation (PWM) to reduce output voltage ripple, Ultrasonic (USM) to avoid audible frequency range , while ensuring that the switching frequency remains above 20kHz.

This product from Diodes contributes to the improvement due to the relatively low on-resistance (RDS(ON)) values of the high-side MOSFETs (47mΩ for AP62500; 22mΩ for AP62800) and low-side MOSFETs (18mΩ for AP62500; 10mΩ for AP62800). Buck conversion efficiency. Ultralow quiescent current (IQ) is also achieved in PFM mode (195µA typical), further improving light load efficiency.

These buck converters are designed to significantly reduce electromagnetic interference (EMI) concerns. A special casket driver design reduces switching node ringing without extending MOSFET turn-on/turn-off times, which would affect high-frequency switching functions. Constant on-time (COT) control achieves fast transient response and low output voltage ripple, and helps make the loop more stable. Another important feature is an adjustable soft-start time to prevent the risk of damage from inrush currents.

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