I was not able to get the MAX756 right away and when it finally came, I was done with the MAX757 version. I was able to charge my iPod Video 30GB 2nd Gen with no problem. I was also able to power up some generic MP3/MP4 players.
Here are some photos:
The final product
Prototype under test
I have used the battery low feature. I have set it to light when the source goes down to 2V.
I have designed my own PCB and I have used a double sided one to be able to use a ground plane. According to Maxim, ground plane helps to make the chip work better.
Now that it is working, I wonder if we can improve the device in some ways like:
1. Over discharge protection if a rechargeable is used.
2. Power/Charging indicator?
I have also tried the SHDN pin to switch the chip on and off but I have decided to just leave it high since even it is off, the battery monitor is stil working and this slowly discharges the battery. The best way is to remove the battery when you are not going to use it.
I have mine built around MAX757 chip. :D
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- Posts: 21
- Joined: Fri Jun 22, 2007 12:11 pm
Re: I have mine built around MAX757 chip. :D
could you give us a schematic of how everything is put together?
- randallf
- Posts: 4
- Joined: Sat Jan 03, 2009 5:29 am
Re: I have mine built around MAX757 chip. :D
What are the benefits of using the Max chip?
- wildswan
- Posts: 10
- Joined: Sat May 24, 2008 4:27 am
Re: I have mine built around MAX757 chip. :D
The schematic is not trivial. You can use what is on the datasheet and improve (or degrade) it depending on what you want to achieve.Illuminum3415 wrote:could you give us a schematic of how everything is put together?
What I like about max is the ability of the chip to work below 1V.
Right now, I am working on yet another Max chip that is capable of delivering 2Amp and could also work under 1V.
- asdfghjkl
- Posts: 2
- Joined: Tue Aug 12, 2014 12:31 pm
Re: I have mine built around MAX757 chip. :D
Hi! Where did you buy the MAX757 IC?
- wildswan
- Posts: 10
- Joined: Sat May 24, 2008 4:27 am
Re: I have mine built around MAX757 chip. :D
I've ordered a sample from Maxim. You can talk to them on how could you buy from them.
- asdfghjkl
- Posts: 2
- Joined: Tue Aug 12, 2014 12:31 pm
Re: I have mine built around MAX757 chip. :D
Thank you! :)
Please be positive and constructive with your questions and comments.