BQ24074 quiescent current under load

deepfryed

Other Parts Discussed in Thread: BQ24074

Hi, I'm using BQ24074 in USB500 mode powering a Bluetooth module. When the MCU goes to sleep it draws about 1uA (verified) but the BQ24074 IC seems to be drawing around 200uA. I'm probably not reading the datasheet correctly, but the quiescent current under load is not clear.

Is is expected and if so, are there any potential solutions we can look at for a battery powered product that needs very low power use in deep sleep ?

Thanks

over 9 years ago

0 Jing Zou over 9 years ago

TI__Mastermind 20570 points

Are you referring IQ on IN pin or BAT pin? Can you please share the schematic?

0 deepfryed over 9 years ago in reply to Jing Zou

Prodigy 110 points

Iq on the BAT pin. Please see the schematic below.

0 Jing Zou over 9 years ago in reply to deepfryed

TI__Mastermind 20570 points

We do not spec quiescent current with load enabled. Please disconnect any load on VCC and BAT+. What is connecting to CG? Current is going to floating through the sense resistor as well.

0 deepfryed over 9 years ago in reply to Jing Zou

Prodigy 110 points

CG is used for current sense, the leak through the 30mOhm resistor should be minimal. I'm really interested in Iq while BQ24074 is driving a very low load like a MCU in deep sleep drawing less than 1uA. I want to make sure I'm not chasing unrelated issues due to board design etc.

Thanks

0 Jing Zou over 9 years ago in reply to deepfryed

TI__Mastermind 20570 points

We do not spec IQ with load active since load profile varies from application to application.

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BQ24074 quiescent current under load