M
[email protected]
- Jan 1, 1970
- 0
I have an old laptop (366MHz) which takes in 18.5V @ 3A by external
(switching?) power supply. (It didn't have a battery with it when I
bought it - got it 2 years ago for about $200.)
I recently built an external battery pack, powered by 16 Energizer 1.2V
2500mAh NiMH AA cells, to power my laptop in lieu of the external power
supply, and it does work. So far I have been able to run the laptop
for about an hour and a half, and still going strong. (Decided to stop
stress-testing at 1:15am, since I had work the next morning.) A far
cry from paying $150 for a "new" laptop battery, when the laptop only
cost me $200. Although, my 16 NiMH AA battery pack screams "GEEK!" at
anyone who glances at it... ;-)
For my next project, a DC-DC converter.
So... I'd like to convert 12VDC from a jump-start car battery to
18.5VDC, at 3A.
After reading a recent thread about avoiding Maxim like the plague, I
went over to TI's website, entered my parameters (Input V: 12VDC;
output V: 18.5 VDC; current: 3A.)
I found this from the search result:
http://focus.ti.com/lit/ds/symlink/tps5430.pdf
but I was a bit confused why this would have been suggested, since it
seems to be a step-DOWN regulator.
Any suggestions...?
Thanks,
Michael
(switching?) power supply. (It didn't have a battery with it when I
bought it - got it 2 years ago for about $200.)
I recently built an external battery pack, powered by 16 Energizer 1.2V
2500mAh NiMH AA cells, to power my laptop in lieu of the external power
supply, and it does work. So far I have been able to run the laptop
for about an hour and a half, and still going strong. (Decided to stop
stress-testing at 1:15am, since I had work the next morning.) A far
cry from paying $150 for a "new" laptop battery, when the laptop only
cost me $200. Although, my 16 NiMH AA battery pack screams "GEEK!" at
anyone who glances at it... ;-)
For my next project, a DC-DC converter.
So... I'd like to convert 12VDC from a jump-start car battery to
18.5VDC, at 3A.
After reading a recent thread about avoiding Maxim like the plague, I
went over to TI's website, entered my parameters (Input V: 12VDC;
output V: 18.5 VDC; current: 3A.)
I found this from the search result:
http://focus.ti.com/lit/ds/symlink/tps5430.pdf
but I was a bit confused why this would have been suggested, since it
seems to be a step-DOWN regulator.
Any suggestions...?
Thanks,
Michael