Another option to consider would be to use two discrete BJTs where one acts as a driver to drive the base of the actual output one (similar to your idea of driving a MOSFET with a BJT), but the collector of the driver goes to the supply directly rather than to the high-side load. I had a project recently where I designed-in darlingtons because there are very few power mosfets which are truly specified to work below 2V gate drive, across temperature and manufacturing variation. As James said, you should check to see whether the chip's output will drive a mosfet fully on. Sean On Fri, Jun 5, 2015 at 6:47 PM, James Cameron wrote: > Yes, you'd need to use the switching design, otherwise by using > a MOSFET you'd lose the peak and hold part of the Figure 1 design. > > You'd best scope the drive voltage to be sure; it isn't specified. > > Figure 23 shows a fairly conventional output stage on pin 2, but it's > a simplified schematic. > > If you have assembly constraints, you might instead work to improve > cooling. > > Google LM1949 MOSFET for other discussions. > > -- > James Cameron > http://quozl.linux.org.au/ > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .