LDO=low dropout regulator, which is a low-voltage difference linear voltage regulator power supply, in fact, it is the most traditional series linear voltage regulator power supply version, the main feature is that the CE voltage on the adjustment tube is relatively small, so that its own loss is relatively small (the efficiency is higher than the general linear voltage regulator power supply, but less than the switching power supply), At the same time, the advantages of small ripple of linear stabilized power supply are retained.
Switching power supply is actually the use of PWM principle, with a high-speed signal to control the switch, constantly open and close, so that the output outlet to obtain an equivalent DC voltage, switching power efficiency is relatively high, but the ripple performance is worse than the linear voltage regulator power supply. If it is a more sophisticated occasion, it is not particularly suitable, and a lot of filtering should be added to the line.
Charge pump is also called switched capacitor voltage converter, is a kind of switching power supply, using the principle of capacitor discharge, often used to generate negative voltage.
Simply put: the power supply is divided into two categories: linear power supply and switching power supply.
LDO is a kind of linear power supply, charge pump is a kind of switching power supply.