Categories

Building a GBA LiPo voltage regulator and charger

Posted on Thursday, June 21st, 2018 in DIY by DP

IMG_4672

Alex published a new build:

I saw a post where someone fitted a 2000mAh LiPo battery to their GBA, they had do to some modifications to the GBA battery compartment to fit it all. By using a LiPo battery instead of the AA’s, it would save us about 20 grams, while not a lot, ever gram does count and you can tell the difference plus since the LiPo has a higher voltage, it has a higher energy density, so it should give us longer play time than the AA’s. So I decided I would do the same mod and I might make a little voltage regulator and charging board to go along with it.

See the full post on insideGadgets project page.

This entry was posted on Thursday, June 21st, 2018 at 11:56 pm and is filed under DIY. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “Building a GBA LiPo voltage regulator and charger”

  1. KH says:

    TPS62200 will get him to under 15uA, a bit better than the 20-30uA he mentioned. I would try the same thing. Switch some resistors in and out of the voltage feedback circuit of the DC-DC and we ought to get the GBA power LED functionality that we want. For voltage level detection costing <1uA, an MCU supervisor chip on the battery side will get you there.

    • AlexiG says:

      Thanks KH, I will check out the TPS622xx family, good idea about the supervisor chip.

      I was looking at the NCP1529 or RT8010 but was seeing 2mA quiescent on both of them. For one of them I could drop the output voltage to under 2V and got the claimed quiescent current. Tried increasing the resistor feedback network which worked but once the input voltage drops to 3.4-3.5V, the current spikes to ~40mA. For both if I added a ~22pF cap on Vref to Gnd (the datasheet didn’t say to do this), then the quiescent current dropped to 40-50uA but the switching noise was really bad under load.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Michael: A feature I've wanted forever is a dual RX UART mode, so I can watch both sides of a UART communication between devices (right now...
  • Alex B: To see the current commit hash, "git rev-parse HEAD"
  • Daniel: Very nice! Welcome to this century...
  • chrismec: What is this Bus Pirate v5? Is this the demo board or is there a new bus pirate in the works?
  • John Peck: Really impressive! Thanks for putting so much documentation together!