for my project I require a step up converter to power a dc motor powered
vacuum pump to run at 6.5 volts (this gives the best ratio of
performance and noise level). The project will be powered by a single
cell LiPo battery. If I understand the datasheets (e.g. TI lmr62014) of
some of the lower cost step up converters correctly the Vout will be
depending on Vin, so Vout will be higher when the LiPo cell is at 4.2
than at around 3.7V. Is this correct and are there alternatives that
keep Vout stable even if the LiPo voltage drops?
Also, can I use a step-up converter's enable/shutdown pin to switch on /
off my DC motor or do I need to switch load with a separate transistor /
fet after the converter is started up?
Thanks for your help!