Need a suitable charger IC - Page 1
Forum section: electronics / projects

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 12:39:07 am
content: Hello there,My application need a battery management charger IC.Take a look the design layout,1. A micro USB connector from smart phone to PC or power adapter will be use.2. From this USB connector VBUS will be supply power to my external system through the battery charging IC.3. This IC will manage the 5V , 2A power from adapter but, in quick charging mode, 9V, 2A power should be block by the management IC.Kindly suggest a circuit and IC application.

author: ncoonrod14
author_rank: Contributor
timestamp: December 26, 2017, 01:56:37 am
content: An important missing detail are the details of the battery this is charging. If it's a single cell lithium battery, I'd suggest the BQ24266RGER from TI. However if you want other features such as digital configuration and whatnot, there are a hundreds of alternatives you can find in DigiKey or any other parametric part searcher.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 03:15:48 am
content: Quote from: ncoonrod14 on December 26, 2017, 01:56:37 amThank you to participate here sir nccooncord14.Let us assume the battery is Li-ion 3.7v 4.07Wh.I dont want top use any firmware interface.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 03:18:36 am
content: Quote from: blueskull on December 26, 2017, 02:04:30 amThank you sir blueskull.I remembered you helped me a lot.Well, I also think so, but my company want to care about protection.Can you tell me more about QC and PD charger? Do you mean this idea,https://blog.blitzwolf.com/pd-charging.html

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 04:15:50 am
content: QuoteNice and reasonable explanation.As you said the QC adapter allows power according to load request then I undertsand its not a problem but still my co worker confused about the charger ic side voltage protection, they want to allow 0-9v there and suggested this IC,http://www.ti.com/lit/ds/symlink/bq24074.pdfI am pretty sure this IC would not work as its EN1 and EN2 pin is control by MCU.Because the datasheet suggested the EN1,EN2 OUT 1 and OUT2 has over voltage limit.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 06:48:33 am
content: QuoteThank you to respond here again.If you look into the datasheet page number 6.You will see EN1, EN2, OUT maximum voltage range is 7 volt.My co worker think, it should be maximum 9 volt.Now I am interested about whathttp://www.ti.com/lit/ds/symlink/bq24266.pdfLooking at this device input voltage range is acceptable.Dont you think its IUSB1.2..3 is also need to control by MCU?BQ24074 has also charging current control option governed by EN1 and EN2!

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 07:55:58 am
content: QuoteMaximum OUT is 5 v!QuoteCan you see Device Functional Modes at page 21 ?Can I set IUSB1..3 GPIOS to ground and OUT with those setting?According to datasheet which mode you suggest?

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 08:29:33 am
content: QuoteWhat do you suggest if its galaxy NOTE 5 type smartphone with USB 2 application ?Here is another 1.5A input current limit option.QuoteDo you want me to use 1.5A input current limit option, its micro usb type application.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 26, 2017, 10:58:28 am
content: Fine! That means 100mA and 500mA is the range for charging current. Lets consider its USB 2.0 communication. In my previous design I have use EN1 and EN2 from the previous chip, but those logic were from main MCU.Since we don't want to use any firmware here, could you suggest me any logic converter which will operate different setting?Or depending on current sensing they will chose the port! I am not sure this chip has the option.

author: soubitos
author_rank: Frequent Contributor
timestamp: December 26, 2017, 11:14:10 am
content: I think this solves your problem easily... this is my module design, you can change it as you pleasehttps://easyeda.com/catech75/TP5100FLEXADV_V2_00-99adcfd808554bc3ad45ced7558ab601

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 27, 2017, 06:12:01 am
content: Quote from: soubitos on December 26, 2017, 11:14:10 amThis design does not contain QC mode.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 27, 2017, 07:01:46 am
content: Quote from: blueskull on December 26, 2017, 09:15:46 amDear Sir Blueskull,At this moment, we are considering 2 QC and PD charger.Now we have measured the current while connect the Galaxy note 5 to those charger.In QC mode, the adapter has 9v/1.67A, while measured we saw 1.23A.My co-worker think, other 0.46 A will go to charger IC portion.He told me to think this.Do you think, it will make a problem?Already BQ24266 has input current limit 2.5A maximum.On the other hand I found a IC, which has current sensing phenomena.Take a look,http://cds.linear.com/docs/en/datasheet/4020fd.pdf,what do you think?

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 27, 2017, 07:48:41 am
content: Quote from: blueskull on December 27, 2017, 07:07:25 amDont mind sir.I am really dont know what he want to do.For sure its very simple question, seems like all connection with this IC is fine.He might be thinking about 2 way current conduction !

author: soubitos
author_rank: Frequent Contributor
timestamp: December 27, 2017, 08:28:09 am
content: I didnt get this was a question on QC charger.. i honestly thought he wanted a charger, period....

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 28, 2017, 12:55:14 am
content: QuoteMr Buleskull,I do respect what you have said.I had a communication barrier with my co-worker.The reason he confused is, the charger ic side current will be 0.44A to 0.30A( depending on the supply current from adapter or over voltage and current protection).The battery we gonna use has 3.7V 2200mAh (sorry for my previous information)actual spec capacity.So, he may thinking that battery charging capability will not be appropriate.All universal adapter and PC usb current rating does not match with our system!

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 28, 2017, 01:48:25 am
content: QuoteThank you so much.We are considering both QC and PD.As you said, it will take long time, it would be a problem for customer.I know even small current can charge the battery, but slow rate is a big problem.Do you have any idea?TI engineer suggested this,http://www.ti.com/lit/ds/symlink/bq25890.pdf.ILIM pin sets the maximum input current and can be used to monitor inputcurrent.I am not considering D+/D- in my circuit operation.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: December 28, 2017, 02:30:39 am
content: QuoteGood information. If I cant go further without D+/D-, then the idea is meaning less.