enough current to power peripheral?

[ldbm]

Hi,
I am trying to figure out if I can power a peripheral with Pyboard v1.1 V+ pin used as an output.

The external chip requires 3.3V to 5.2V . Normal current draw would be modest, around 20-40mA, but it would briefly spike to 600-800mA. (briefly may be ~ 1 s or less) . I was thinking to power Pyb via the microUSB ( just using the power lines) with a battery. I would have to account for the drop in D1 though, which for this current would be ~ 1V (see specs). The battery being 3.6 V Nominal, this would lead to 2.6V left at V+: not good. Plus there would be no regulated voltage with this approach...

Same issue on the Pyboard D it seems with the LD39130S LDO rated for 300mA

L.

[Roberthh]

You can supply the Pyboard through the V+ signal. The voltage range is 3.6-16V. Then you can attach the external device too at these pins.

[ldbm]

Thx Robert. Yes like you say why not just powering the peripheral with the external source powering the board.

PS: the doc page points to LDO MCP1802 (up to 10 V supply) and omits the link to the MCP1703 on the Pyboard 1.1 (up to 16 V supply like you mention)

[ldbm]

Actually, this micropython official pagehas misleading info about powering the boards: pyb v1.0 can only be powered up to 10 V as they use the LDO MCP1802 . Unless I am missing something (newbie using this board).
Cheers,
L.