BQ25606: Single-cell Charger Design without PPM

InProgress

Part Number: BQ25606

I designed a charger for a single-cell battery. I used bq25606. My concern is I am not using its USB or power path management features. The circuit that I designed is given below. Can you evalute this schematic, with my given concerns?

Also I have some concerns about charge termination. Charge termination current is not programmed in this circuit. How does it end the charge?

Should I connect SYS pins to the output or should I just use it as LED supply?

Configuration: Input: 7.5V, ~1A Charge: 4.2V, 1.25A

Thank you in advance

over 7 years ago

0 Hong Mao over 7 years ago

TI__Expert 5590 points

The schematic looks OK except a capacitor on SYS is missing. 10uF capacitor should be added.

The termination current is 5% of charge current ICHG 1.25A, which is shown in the EC table.

Should I connect SYS pins to the output or should I just use it as LED supply? SYS can power external devices.

0 user5181792 over 7 years ago in reply to Hong Mao

Prodigy 35 points

Can you please confirm me if the LED's connection on STAT and PG pins are correct? Shouldn't they be connected to the STAT or PG pins and ground directly since this pins only provide 0.4 V?

In the way they are connected in the schematic do they show the status?

0 Hong Mao over 7 years ago in reply to user5181792

TI__Expert 5590 points

Yes, the connection is correct. Both pins are open drain inside.

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BQ25606: Single-cell Charger Design without PPM