BQ24045: BQ24045 Charging output without battery presence

Tirthal patel

Part Number: BQ24045
Other Parts Discussed in Thread: BQ24078

Dear,

We are planning to implement BQ24045 battery charging IC in our system i have already worked on the BQ25606RGER where my charging current requirement was high.

My question is that when battery is not present ,at that time what will be the output of the battery charging IC.In this scenario will i get pulsating voltage between the range of 4.1 to 4.27 V same like the BQ25606RGER.

Also how much current output will i get when no battery is present.?

In my system charging current requirement is around 650 to 800 mA.

Please provide us any other IC which could provide us similar kind of functionality.

Your help would be appreciated.

Waiting for your reply..!!

over 5 years ago

0 Nick Brylski over 5 years ago

TI__Mastermind 19195 points

Hi Tirthal,

When battery is disconnected, a battery detect routine will run, applying Vreg-400mV=3.9V for 25ms. If TTDM mode is not disabled (see d/s 8.4.9), this routine will not run until battery is reconnected again. See figure 25 of d/s.

Output current when no battery is present will be up to the fast charge current (ISET), 1A.

Best,

0 Tirthal patel over 5 years ago in reply to Nick Brylski

Intellectual 460 points

Dear,

Ok so means till TTDM is not disable battey charging ic will not provide any pulsating output 3.9V for 25ms.

I my schematic i have connected the TS pin with 10 resistor and pulled to the Vss (GND).

So this will terminate the TTDM mode and will provide me with pulsating output 3.9V for 25ms.

Waiting for your reply.!!

0 Nick Brylski over 5 years ago in reply to Tirthal patel

TI__Mastermind 19195 points

Yes, TTDM will be disabled with current schematic. For a fixed resistor you will get pulsating output when battery is removed, as seen in figure 23.

Best,

0 Tirthal patel over 5 years ago in reply to Nick Brylski

Intellectual 460 points

Yes,Thank you

Also it would be great i can get similar kind of PMIC IC which provides same functionality,so please suggest us if any.

0 Nick Brylski over 5 years ago in reply to Tirthal patel

TI__Mastermind 19195 points

Hi Tirthal,

A similar part you could look into is the BQ24078, main difference is that this part offers PowerPath. The BQ2407X family of devices are power path and have a separate battery charge path and system load path

Best,

Power management

Power management forum

BQ24045: BQ24045 Charging output without battery presence