External soft start DC-DC buck converters all have a soft-start function. After the converter starts up, the duty cycle increases gradually, allowing the output voltage to rise smoothly, which avoids inrush currents due to sudden charging of the output capacitors. Converters with internal soft start will have a constant soft start time. If the application …
The first parameter to consider when selecting the right buck converter is the input voltage range. Converters with an input voltage range of 2.5V to 5.5V are best suited for applications powered by a single lithium-ion battery, but can also be used in 5V power supply applications. Converters with an input voltage of around 18V …
Basics of DC-DC buck converter The DC-DC buck converter is a switch-mode step-down converter that provides high efficiency and flexibility at high dropout ratio (VIN) and high load current. The basic circuit is shown in Figure 1. Most Buck converters contain an internal high-side MOSFET and a low-side synchronous rectifier MOSFET switched by an internal …