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4.8v to 9v or 12v boosters

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Old 01-01-2004, 11:03 PM
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PlaneKrazee
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Default 4.8v to 9v or 12v boosters

If you need a way of using a 4 cell nicad or a two cell lithium ion pack to power your 8v, 9v, 12v, 15v systems then the Texas Instruments PT 5040 or PT5540 series of step up intergrated power boosters are the ticket.

The PT5540's are harder to find than the PT5040 line but some of the specs are better. The 5540 series will output the rated voltage until the battery pack reaches 4.5 volts and are 85% efficient. You need to add one 100uf 25v electrolytic cap across the input and one across the output as stated in the literature for proper operation. The regulator weighs 6.5 grams.

Installing these regulators really helped with video quality by supplying the proper voltages to the tx and camera, better than a 9v transmitter battery or wall wart transformers.

Here are the links:

http://focus.ti.com/lit/ds/symlink/pt5541.pdf

http://focus.ti.com/lit/ds/symlink/pt5041.pdf

I used one pt5545 5v to 9v and one pt5541 5v to 12v plus four 100uf electrolytic caps to power my airborne system with one 800ma 4.8v pack. The system operated continuously for over 45 minutes and the output voltages were right on spec., 12.00v and 9.00v. The transmitter draws 240ma at 9 volts and the camera draws 110ma at 12v. The pack had not been charged in over 5 weeks so it may have discharged a bit prior to the test.
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Old 01-05-2004, 02:36 AM
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Default RE: 4.8v to 9v or 12v boosters

Thanks for the info Brian, they look like a nice setup.
about how much did they cost and where is the best place to order one?
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Old 01-05-2004, 11:10 AM
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Default RE: 4.8v to 9v or 12v boosters

You are looking at $15.00-$18.00 plus $5.00 for the capacitors. The larger mail order houses like Arrow Electronics will stock the 5040 series.
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