Hi Art, I've used several of those boards. The MT3608 is a really good chip, no mat= ter who seems to make them, I'm sure it's become generic. Very efficient ev= en at low current. But there is no disconnect, the input voltage will always feed through to t= he output in shutdown, so the chip enable is of limited use to me and I hav= e not tested the current drain in shutdown. If I get a chance I'll test one tonight. Best regards, Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of Art Sent: Wednesday, November 7, 2018 11:12 PM To: Microcontroller Public Subject: [EE] extremely low current switching regulators (boost)? 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-Convert= er-Step-Up-Voltage-Regulator/152982253675?hash=3Ditem239e73f06b:g:bl4AAOSwV= -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/MT3608.= pdf TY. Art --=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 .