BQ25618: BQ25618 enable

Jim Tseng

Part Number: BQ25618

In my experience, TI’s stand along charger IC can automatically regulator out SYS power. We don’t need to enable the system power. So does BQ25618 can automatically generate system power by its self? Any register setting or HW enable need?

Jim

over 4 years ago

0 Ricardo over 4 years ago

TI__Genius 10385 points

Jim,

The output of the SYS pin is managed autonomously. The minimum system voltage regulation setting can be adjusted via I2C, but it will be 3.5V in default mode.

It is important to understand the following:

If VBUS is present:

VBAT < VSYSMIN -> VSYS = VSYSMIN

VBAT > VSYSMIN -> VSYS ~= VBAT

If VBUS is absent

VSYS ~= VBAT

Best Regards,

Ricardo

0 Jim Tseng over 4 years ago in reply to Ricardo

TI__Intellectual 2320 points

HI Ricardo,

Thanks! This is really helpful.

Jim

0 Jim Tseng over 4 years ago in reply to Jim Tseng

TI__Intellectual 2320 points

HI Ricardo,

The datasheet show that MAX Isw is 1.8A.

Does it means Isys to be 1.8A? If the overall system current is over 1.8A, does battery catch up the insufficient current(suppose battery is in high capacitance)?

thanks!

0 Ricardo over 4 years ago in reply to Jim Tseng

TI__Genius 10385 points

Jim,

I_SW max is the maximum current the buck converter can output from the adaptor. However, additional current can be supplemented by the battery when the adaptor is present. When the adaptor is absent, all current will come from the battery and I_SW does not matter at all.

Best Regards,

Ricardo

Power management

Power management forum

BQ25618: BQ25618 enable