BQ25180: discharge current on BATFET

Given Ding

Part Number: BQ25180

Hi Team,

my customer has 2.6A/100us on Vsys.
I see in BQ25180, there is below spec, 2.5A/20ms but not sure if above will trigger OCP.

I also see bat_OCP can be disabled, if it's disabled, what will happen? Thanks.

BRs

Given

over 1 year ago

0 Rafael Camarillo over 1 year ago

TI__Intellectual 910 points

Hey Given,

I will look into this transient for you, but we can only guarantee our parts performance with what is written in the d/s.

BAT_OCP is an internal check that limits the discharge current being pulled from the battery.

Disabling the BAT_OCP just disables the internal check and will not disconnect the battery from the system when there is an over current event.

V/R

Rafael Camarillo

0 Given Ding over 1 year ago in reply to Rafael Camarillo

TI__Genius 10205 points

Hi Rafael,

Thanks for your reply. clear on the BAT_OCP disable function. looking forward to your reply on transient. Thanks.

BRs

Given

0 Rafael Camarillo over 1 year ago in reply to Given Ding

TI__Intellectual 910 points

Hey Given,

I am glad that cleared some issues.

I have reserved some lab time for tomorrow, I will get back to you as soon as I figure something out.

V/R

Rafael Camarillo

+1 Rafael Camarillo over 1 year ago in reply to Rafael Camarillo

TI__Intellectual 910 points

Hey Given,

When testing our EVM setting OCP to 1000mA triggered the over current protection (first image). When we disabled the OCP it did not trigger (second image). Hope this helps!

V/R

Rafael Camarillo

0 Given Ding over 1 year ago in reply to Rafael Camarillo

TI__Genius 10205 points

Hi Rafael,

Thanks for your reply.

OCP is setting through REG, but in EC table, there is system discharge current (pulse) which is 2.5A/20ms. Is it hardware protection regardless of REG setting or it is also related OCP setting in REG? If it's disabled, then no such pulse protection limit too? Thanks.

BRs

Given

+1 Anthony P Pham over 1 year ago in reply to Given Ding

TI__Mastermind 23410 points

Hi Given,

The 2.5A / 20 ms that's listed on the datasheet is a physical package limitation. Anything beyond this and you risk damaging the IC physically. It is not tied to the BATOCP in any way.

Best Regards,

Anthony Pham

0 Given Ding over 1 year ago in reply to Anthony P Pham

TI__Genius 10205 points

Hi Anthony,

understand. So，

a. 2.6A/100us will not trigger BATOCP if it's disabled, right？

b. will 2.6A/100us damage the part?

Thanks.

BRs

Given

+1 Anthony P Pham over 1 year ago in reply to Given Ding

TI__Mastermind 23410 points

Hi Given,

Yes, 2.6A over 200 us will not trigger BATOCP when BATOCP is disabled.

Based on the datasheet,

I cannot guarantee that this will damage the part since it is 2.6A @ 100 us.

Best Regards,

Anthony Pham

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BQ25180: discharge current on BATFET