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LiPoly protection circuit

  • Thread starter Daniel Kelly \(AKA Jack\)
  • Start date
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Daniel Kelly \(AKA Jack\)

Jan 1, 1970
0
Hi,

I need a protection circuit for my lithium polymer battery. All the circuit
needs to do is prevent the cell voltage from going below 3v. If the voltage
goes below 3v then the battery must be disconnected to prevent damage caused
by deep-discharge.

Some suppliers (e.g. TI) sell single chips that do this. Does anyone know
how I can get my hands on such a system here in the UK?

Or any good schematics for a DIY circuit? I could try hacking something
together myself but I'd feel safer with a tried-and-tested system.

Thanks
Jack.
 
E

Evgenij Barsukov

Jan 1, 1970
0
Daniel Kelly (AKA Jack) said:
Hi,

I need a protection circuit for my lithium polymer battery. All the circuit
needs to do is prevent the cell voltage from going below 3v. If the voltage
goes below 3v then the battery must be disconnected to prevent damage caused
by deep-discharge.

Some suppliers (e.g. TI) sell single chips that do this. Does anyone know
how I can get my hands on such a system here in the UK?

Well, TI of cause has distributors in UK so all parts are accesible there.
Many of them are catalogue parts, so you could purchase them directly
from any electronic parst supplier.
Specifically for TI in UK see:
http://www.ti.com/europe/docs/sites/uk.htm
Or any good schematics for a DIY circuit? I could try hacking something
together myself but I'd feel safer with a tried-and-tested system.

All TI parts come with reference design schematics and documentation. See
power.ti.com, particularly
http://focus.ti.com/docs/search/par...param_table&templateId=2&showAssociated=false

Regards,
Evgenij


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Daniel Kelly \(AKA Jack\)

Jan 1, 1970
0
Hi Evgenij,

Many thanks for your reply.

Yes, I have been looking through TI's UK suppliers. But, so far, none are
willing to sell me any less than 120 parts. I only need 2! I'll keep
looking.

Thanks,
Jack
 
I

Ian Stirling

Jan 1, 1970
0
In sci.chem.electrochem.battery "Daniel Kelly \(AKA Jack\) said:
Hi Evgenij,

Many thanks for your reply.

Yes, I have been looking through TI's UK suppliers. But, so far, none are
willing to sell me any less than 120 parts. I only need 2! I'll keep

I'd suggest paralleling the two cells, then looking round
http://www.maxim-ic.com/ for a suitable step-up SMPS chip to use, with
low battery shutoff.
Set it to 3V, and you'r done.
o
Maxim will supply samples easily if you fill in the requisite form
on their site.
 
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Daniel Kelly \(AKA Jack\)

Jan 1, 1970
0
Great, thanks.

I am ordering from Maxim right now!

Thanks,
Jack
 
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