LM5069: Design for Hot swap two batteries

Jesse Chang

Prodigy 100 points

Part Number: LM5069
Other Parts Discussed in Thread: TCA9511A, TPS2597, TPS25981

Tool/software:

Dear Sir,

As below block diagram, we need the hot swap function for two batteries with I2C interface.

There is three questions:

1. Is I2C Buffer TCA9511A necessary?

2. Do I need to add hot swap protection IC between Charging IC and battery?

3. Any problem with my block diagram for battery hot swap design? Do I need to add more design for completing the hot swap function?

7 months ago

0 Kunal Goel 7 months ago

TI__Guru* 79181 points

Hi Jesse,

Please let me check and get back.

Regards

Kunal Goel

0 Jesse Chang 7 months ago in reply to Kunal Goel

Prodigy 100 points

Hi Kunal,

Do you have any update? Thanks a lot.

Regards

Jesse

0 Kunal Goel 7 months ago in reply to Jesse Chang

TI__Guru* 79181 points

Hi Jesse,

Present design looks fine to me.

After DC jack you can use eFuse device like TPS2597, TPS25981, where FET is integrated.

Please post a separate thread for TCA9511A, expert of this device will get back to you.

Can battery by hotplugged or reverse connected?

Regards

Kunal Goel

0 Jesse Chang 7 months ago in reply to Kunal Goel

Prodigy 100 points

Hi Kunal,

Kunal Goel said:
Can battery by hotplugged or reverse connected?

Battery need hotplugged scenario, but reversed connected is not allowed by mechanical design.

Regards.

Jesse

0 Kunal Goel 7 months ago in reply to Jesse Chang

TI__Guru* 79181 points

Hi Jesse,

How will current flow from battery to load, is it through charging IC?

Plese let me know if you want to know more about eFuse device.

Regards

Kunal Goel

0 Jesse Chang 7 months ago in reply to Kunal Goel

Prodigy 100 points

Hi Kunal,

1. Yes, it's through charging IC.

2. OK.

BRs

Jesse

+1 Kunal Goel 7 months ago in reply to Jesse Chang

TI__Guru* 79181 points

Hi Jesse,

1. If your charging IC has features like overcharge/discharge protection then no need to use hotswap protection between charger IC and battery.

2. eFuse device have same function like hotswap device but FET and current sense in integrated thus saving on size and cost. You can check out more here:

eFuses & hot swap controllers | TI.com

Regards

Kunal Goel

Power management

Power management forum

LM5069: Design for Hot swap two batteries