[EE] extremely low current switching regulators (boost)?

[Art]

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-Converter-Step-Up-Voltage-Regulator/152982253675?hash=item239e73f06b:g:bl4AAOSwV-xa0OTH:rk:1:pf:1&frcectupt=true
 
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

[James Cameron]

Hmm, yes, the MT3608 datasheet says current (shutdown) with conditions
VEN = 0V, typical 0.1 microamp, maximum 1 microamp, on page 3. But if
the cloned chip datasheet says nothing, it could be anything.

[Forrest Christian (List Account)]

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.

Post by Art
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
https://www.ebay.com/itm/MT3608-Boost-Adjustable-24V-4A-DC-DC-Boost-Converter-Step-Up-Voltage-Regulator/152982253675?hash=item239e73f06b:g:bl4AAOSwV-xa0OTH:rk:1:pf:1&frcectupt=true
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
https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf
TY.
Art
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[Bob Blick]

Hi Art,
I've used several of those boards. The MT3608 is a really good chip, no matter who seems to make them, I'm sure it's become generic. Very efficient even at low current.

But there is no disconnect, the input voltage will always feed through to the output in shutdown, so the chip enable is of limited use to me and I have not tested the current drain in shutdown.

If I get a chance I'll test one tonight.

Best regards, Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@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-Converter-Step-Up-Voltage-Regulator/152982253675?hash=item239e73f06b:g:bl4AAOSwV-xa0OTH:rk:1:pf:1&frcectupt=true

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

[Bob Blick]

Hi Art,

I wasn't able to spend much time looking, and didn't find the MT3608 boards I had, but I did find another part you might consider. It's the AP3012, marketed by Diodes Incorporated and sold through US distributors. 500mA step up. Under 1uA in shutdown. You might give it a look.

I'll dig around this weekend for those MT3608 and give you a report when I find them.

Cheerful regards,

Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@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-Converter-Step-Up-Voltage-Regulator/152982253675?hash=item239e73f06b:g:bl4AAOSwV-xa0OTH:rk:1:pf:1&frcectupt=true

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