Look at the mcp1640 and similar.  I've used that in single cell
applications.

I currently use the mcp1661 but not in a battery powered app.

On Thu, Nov 8, 2018, 8:23 AM Art <ky1k@myfairpoint.net wrote:

> Hi All,
>
> I am building an extremely portable PIC circuit, which means light
> weight and very compact. And, this means my power budget is tight, so I
> need a very low power switching regulator, especially when the Chip
> Enable input tells the device it isn't needed.
>
> I notice the Chinese sellers on ebay offer a prebuilt regulator based on
> the MT3608 chip, see:
>
>
> https://www.ebay.com/itm/MT3608-Boost-Adjustable-24V-4A-DC-DC-Boost-Conve=
rter-Step-Up-Voltage-Regulator/152982253675?hash=3Ditem239e73f06b:g:bl4AAOS=
wV-xa0OTH:rk:1:pf:1&frcectupt=3Dtrue
>
> The chip isn't made for the US market, so it isn't spec'd well::>
> However, the very limited datasheet doesn't specify the current drawn
> when the CE tells the chip to stand down. And, based on what I know
> about the Chinese chip vendors, I don't think I should just 'assume'
> that the chip will draw micropower when it's not being called upon to
> produce power.
>
> I'm curious whether anyone on the list has used these chips, and whether
> they might have measured the current drawn when the chip is shut down???
>
> Also, I only need 40 to 100 mA output current, so there might be a
> better chip for my purposes anyway....the MT3608 can supply up to 2A,
> which is way more than I need::> Can anyone suggest a better chip that
> is fully spec'd? The chip is also a single manufacturer (microsemi.com),
> so if it's discontinued, I have to find another chip anyway!!! The
> datasheet for the MT3608 is at:
>
>
> https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT360=
8.pdf
>
> TY.
>
> Art
>
>
>
>
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