My favorite chip in this regard is the MCP1661 (or MCP1662). It can be used in boost, or buck/boost configurations. I'm using this in a buck-boost application where the voltage can range from around 3V up to around 12Volts, and I need 3.3V out. In the buck/boost mode you need a 2 coil coupled inductor. The datasheet would indicate that it is only good up to 5.5V, but that can be solved with a simple shunt regulator (aka resistor+zener diode) on the Vin pin. I've also used the MCP16251 which looks very similar to the TPS61222DCK. This was in a battery-powered application, and I used the shutdown capability to act as the power off switch for the device. The power button would pull the switch up to where it would turn on long enough for the inverter to start and the microcontroller to hold the switch input up. For the low current needs of the OP, I'd actually consider something like a MCP1252. No inductors, just caps and resistors. Not sure about the quality of the output though.... On Tue, Oct 17, 2017 at 11:57 AM, Neil wrote: > I just did the same thing. 2.8V to 3.8V in, 5V out, 50mA. I used a > TPS61222DCK chip. > The chip, 1 inductor, 2 capacitors. > Waiting on parts to come in, so don't have test resuts yet. But my > experience with other TI switchers has been great and webench.com will > design/choose components for you. > > https://www.digikey.com/product-detail/en/texas- > instruments/TPS61222DCKR/296-39435-1-ND/5143383 > > Cheers, > -Neil. > > > > > On 10/17/2017 11:53 AM, Electron wrote: > > sorry, last message was sent with wrong subject, please delete it :( > > > > --- > > > > Hi, > > is there a wonder-IC that will take 3.3V in input and give 5.0V in > output well > > filtered (similar to a linear voltage regulator output), and that > doesn't require > > many components? > > > > I was thinking about an integrated boost converter + LDO but the > requirement of > > an inductor plus n resistor and capacitors doesn't make me really > enthusiast. > > > > Maybe a more integrated IC? > > > > Or a charge-pump based one? > > > > Current requirement is low, 50mA would suffice. > > > > Do you know / can you suggest a nice and not too expensive IC which > requires as > > few external components as possible? I've searched but I am more lost > than before. > > > > Thank you very much. > > > > With kind regards, > > Mario > > > > -- > 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 *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 forrestc@imach.com | http://www.packetflux.com --=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 .