Can two of the LM2621 switching regulators be put in parallel to boost the output current?
It is easy to parallel two of the LM2621. All that is needed is to tie the two outputs together. They will most likely not have the exact same bandgap and the resistors used will not be exactly equal, but whichever one ends up with a slightly higher output voltage will pump current more often. When it is at its current limit and the output starts dropping slightly, the other one will start switching to supply the extra current needed. This will cause many strange frequencies on the output. Therefore an LC filter may be a good idea if noise becomes an issue. If paralleling two LM2621s, a current sharing resistor could be used, but is not needed. If connected to the right resistor, it could divide the supply current more equally, but because we could never know which will have a slightly higher bandgap or hysteresis window, adding a resistor to the output may not help and therefore is not required. Consequently, one of the ICs will do most of the work at lower load currents, which is oka
