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High-Efficiency Buck Converters from Diodes Incorporated Provide Wide-Ranging POL Design Versatility
Both buck converters have wide input voltage ranges—with the AP62500 covering 4.5V to 18V, and the AP62800 covering 4.5V to 17V (making both suitable for 5V and 12V rail applications). Their output voltages can be adjusted down to 0.6V. Three different switching frequencies may be selected (400kHz, 800kHz, and 1.2MHz), allowing engineers to prioritize elevated conversion efficiency or focus on having a compact form factor. In addition, the devices have three selectable operating modes; pulse frequency modulation (PFM) for improved light-load efficiency, pulse width modulation (PWM) for reduced output voltage ripple, and ultrasonic (USM) for avoiding audible frequency range while ensuring the switching frequency stays above 20kHz.
On-resistance (RDS(ON)) figures are kept low in relation to both the high-side MOSFET (47mΩ for AP62500; 22mΩ for AP62800) and low-side MOSFET (18mΩ for AP62500; 10mΩ for AP62800). This helps to improve step-down conversion efficiency levels. An ultra-low quiescent current (IQ) is also achieved while in PFM mode (195μA typical), further enhancing light-load efficiencies.
The design of these buck converters minimizes electromagnetic interference (EMI) issues. A proprietary gate-driver design mitigates switching-node ringing without having to extend MOSFET turn-on/turn-off times, which would otherwise impact high-frequency switching capabilities. Constant on-time (COT) control results in fast transient response and low-output voltage ripple, as well as facilitates better loop stabilization. Soft-start time adjustability is another important feature to protect against the risk of damage from inrush currents.
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