BQ24210: Proper way to disable LPCM through TS and VTSB pins

James Ries

Prodigy 40 points

Part Number: BQ24210

I would like to use a BQ24210 to charge a Li-Ion battery from a small solar panel.

Solar panel: 5V, 30mA

Battery: 18650 3.7V 2200mAh, no thermistor

Question 1:

I intend to operate in LPCM by tying TS high as directed in the spec. However, I am not sure what to do with VTSB. Do I just tie VTSB to TS and let it pull TS high? Would I need any other biasing? Is it better to separately tie TS high and let VTSB be unconnected?

Question 2:

What would be the expected charge time for this combination?

Question 3:

If I decide the charge time is excessive, what would be a better charge controller to use with this solar cell and battery? What would be the charge time for the recommended controller?

over 6 years ago

0 Bill Johns over 6 years ago

TI__Guru* 75656 points

Hello

The solar panel may be a little small for this battery. 30mA from the panel will take over 70 hours for a full charge. Would that fit you use case?

0 James Ries over 6 years ago in reply to Bill Johns

Prodigy 40 points

The size of the solar cell is definitely border line, but it can still stay ahead of the power draw. Hopefully I can find a panel at least a little larger.

But assuming 30mA on the low end of the range, am I OK to stay with the BQ24210, or is there a better option? How would I handle the TS and VTSB pins?

0 Bill Johns over 6 years ago in reply to James Ries

TI__Guru* 75656 points

Hello

"How would I handle the TS and VTSB pins?" -- Bill J - For LPCM operation connect TS to VTSB and add 0.1uF capacitor to ground.

Power management

Power management forum

BQ24210: Proper way to disable LPCM through TS and VTSB pins