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Old 05-17-2015, 11:31 AM #1
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Default Looking for a boost IC

I'm working on a project at the moment where I need to be able to generate 5V from a single LiIon cell. But having a bit of a hard time finding an IC suitable.

Basically what I need is:

5V out from single cell LiIon
500mA current (preferably without heatsinking)
Active low shutdown pin (GND = off) (prefered, but active high can work too)
Load disconnect (load is disconnected from the battery when it's in shutdown)
Hand solderable package - basically anything but QFN/BGA/no exposed pins

Minimal external components, but not a big deal.

Suggestions?


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Old 05-19-2015, 09:27 PM #2
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Default Re: Looking for a boost IC

I am severely partial to the MAX1771, but I am heavily biased to "works for everything" solutions when it comes to ICs (which for boost means external fet). It's active high shutdown, though.
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Old 05-20-2015, 05:18 AM #3
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Default Re: Looking for a boost IC

The LT1370 is basically idiotproof, and easily hand solderable. Page 13 has a li ion to 5V example circuit.

http://www.linear.com/docs/5180
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Old 05-20-2015, 06:34 AM #4
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Default Re: Looking for a boost IC

I was going to open a thread like this lol. I need a boost driver that will provide 7+ volts and around 190ma. Any suggestions?
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Old 05-20-2015, 01:47 PM #5
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Default

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Originally Posted by VisibleGreen View Post
I was going to open a thread like this lol. I need a boost driver that will provide 7+ volts and around 190ma. Any suggestions?
LT1370 works for that too.
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Old 05-20-2015, 02:35 PM #6
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Default Re: Looking for a boost IC

I like the TPS61200 because it has an optional under voltage cutoff pin.
Can do 500mA without a problem
Has a (GND = off) enable.
Has load disconnect.
Minimal external components (5-8 depending on your configuration)
http://www.ti.com/lit/ds/symlink/tps61201.pdf

The only reason you may not like it is the DFN package, but they are still manageable by hand with thin solder and a fine tip. If you plan on hand soldering just make the pads really long so any extra solder wont bridge.

Edit: Should mention that if you hand solder it may not be able to handle 500mA because the underside wont be connected. Easy enough to reflow though.

Last edited by ARG; 05-20-2015 at 02:38 PM.
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Old 05-24-2015, 10:47 AM #7
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Default Re: Looking for a boost IC

Cheers everyone, I'll have a look. I've been looking at the tps61092, which granted is QFN but seems like a pretty neat chip, but seeing some better looking ones here
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