Need a suitable charger IC

[Md Mubdiul Hasan]

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.

[ncoonrod14]

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.

[Md Mubdiul Hasan]

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.

Thank 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.

[Md Mubdiul Hasan]

You don't have to worry about QC 9V. A properly designed QC charger should not output 9V unless being requested by its load.
Before negotiation, QC and PD chargers will output only 5V.

Thank 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

[Md Mubdiul Hasan]

QC is a Qualcomm standard, and PD is part of USB standard. Both are designed to allow more power to flow through a USB port. Since you can't pump too much current through such a small connector, to get higher power, you need to raise the voltage. Therefore, both QC and PD are capable of sourcing more than 5V in order to increase charging power. QC2.0 can pump out up to 12V, while PD 2.0 and QC 3.0 can pump out up to 20V.

To achieve backward compatibility, both standards define normal output voltage to be 5V, just like plain old USB, but after a negotiation between power sink and power source, the voltage can be changed on the fly. When connection is lost, the power supply shall go back to 5V mode in a very short amount of time (0.65ms for USB PD) to prevent blowing up the next device plugged in if it is not high voltage compatible.

If you just want the protection against a faulty charger, there are a lot of charger ICs (Maxim and TI) that have overvoltage protection, they will only operate from up to 5.5V or 6.0V, but they can withstand 24V or up to 28V without having any damage, and they will just disable the output if input voltage is too high.

Nice 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.pdf
 I 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.

[Md Mubdiul Hasan]

Why not? Just tie EN1 and EN2 to known voltage level.

Thank 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 what http://www.ti.com/lit/ds/symlink/bq24266.pdf
Looking 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!

[Md Mubdiul Hasan]

Tie it to OUT pin or GND.

Maximum OUT is 5 v!

Don't touch it unless you know what you are doing. It's quite a complicated chip.

Can 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?

[Md Mubdiul Hasan]

Depending on your system. USB spec says your device can't draw more than 100mA before enumeration, so you have to set them to 000 on power up. Then, after successful USB enumeration, you can set them to up to 500mA for USB2.0 device and 900mA for USB3.0 device.

What do you suggest if its galaxy NOTE 5 type smartphone with USB 2 application ?
Here is another 1.5A input current limit option.

If your device has QC or PD negotiation capability or your device uses USB-C with CC voltage detection capability, you can optionally enable 1.5A or 2.5A mode. 1.5A mode can also be enabled after BC1.2 CDP/DCP are detected.

Do you want me to use 1.5A input current limit option, its micro usb type application.

[Md Mubdiul Hasan]

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.

[soubitos]

I think this solves your problem easily... this is my module design, you can change it as you please
https://easyeda.com/catech75/TP5100FLEXADV_V2_00-99adcfd808554bc3ad45ced7558ab601

[Md Mubdiul Hasan]

I think this solves your problem easily... this is my module design, you can change it as you please
https://easyeda.com/catech75/TP5100FLEX_ADV-cf5fb967f9774e009362a2e0f0cc8656

This design does not contain QC mode.

[Md Mubdiul Hasan]

If you are designing a digital gadget that there's no guarantee what charger the users will use, then you need to design it to be compliant. You need to consume no more than 100mA before enumeration, and use MCU to dynamically change current limit after enumeration. 1.5A is only possible after BC1.1/BC1.2 compatible chargers are detected per USB specification. Most USB-enabled chips have built-in BC detection circuit, you just need to enable it and read the result from register.

Dear 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?

[Md Mubdiul Hasan]

My co-worker think, other 0.46 A will go to charger IC portion.

Bullshit.

I'm not paid to design for you or your coworker. Please ask specific questions on technology. No one is paid to read datasheet and solve simple beginner questions for you. There is a beginners' section for that purpose.

Dont 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 !

[soubitos]

I didnt get this was a question on QC charger.. i honestly thought he wanted a charger, period....

[Md Mubdiul Hasan]

Please ask specific questions on technology.

Mr 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!

[Md Mubdiul Hasan]

You can charge your 2000mAh battery at any rate no more than 1C (2200mA), you can charge it slower, it will just take longer time.

Thank 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 input
current.
I am not considering D+/D- in my circuit operation.

[Md Mubdiul Hasan]

You can't do PD with micro USB cable. You need to talk over CC pins. You can't do QC nor BC1.1/1.2 without D+/D-.

Good information. If I cant go further without D+/D-, then the idea is meaning less.