Hi there, 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! Jens
All DC/DC converters (I am aware of) regulate the output voltage. The LMR62014 definitely does. As you can see in the connection diagram on page 2 of the LMR62014 data sheet, the output remains connected to the input via L1 and D1 even if the converter is in shutdown. So you will need a separate FET.
Jens, du könntest auch auf der deutschen Seite (hier), direkt auf deutsch schreiben.
Hi Peter, thanks for the swift reply and good advice! Any step up converter that doesn't require external diode & fet that you would recommend (<=70 cent /1000u)? @Andreas: Danke für den Tip! Gruß, Jens
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