TPS61094: IC input issue

Jhon Jairo Zambrano

Prodigy 80 points

Part Number: TPS61094

Hi, best regards.

I'm having troubles with power consumption using TPS61094 (IC1) in the schematic shown below.

The label BAT_LIPO represents a LiPo battery voltage range of 3V-4.2V.

IC11 is a buck-boost RP605K333B.

When I open the SMD jumpers (JP3, JP11) with the EN pin in a low state and no load, and power supply only to IC1, the power consumption is ultra-low (nA), according to the datasheet. If I close jumper JP3, the total power consumption measured at BAT_LIPO increases to ~130uA.

However, after I have unmounted C59 and C12, the measured current becomes as low as ~20uA.

C59 its an electrolytic capacitor.

What do you think is happening in the IC1 input ?

over 1 year ago

0 Brigitte over 1 year ago

TI__Guru 61075 points

Hello Jhon Jairo Zambrano,

Where do you measure the current? Which voltages are applied? Where have you found the current consumption information? Where is the battery connected?

Best regards,
Brigitte

0 Jhon Jairo Zambrano over 1 year ago in reply to Brigitte

Prodigy 80 points

Hi Brigitte, best regards

For power consumption I use Nordic PPK II

The IC1 current was measured in JP3.

Total current was measured in BAT_LIPO jumper available, this jumper receives the Battery.

The information about the current consumption

Although the test conditions(Vin=2V, Vout=3.6) are not the same as in my case, the current consumption is similar. The current consumption is achieved only when I unmount C59 and C12

0 Brigitte over 1 year ago in reply to Jhon Jairo Zambrano

TI__Guru 61075 points

Hello Jhon Jairo Zambrano,

If the current consumption is similar, I do not understand your question. Please rephrase it the way that I can understand it.

Best regards,
Brigitte

0 Nathan Ding over 1 year ago in reply to Brigitte

TI__Genius 9545 points

Hi Jhon,

Personally I think it may related to the leakage current of the bulk cap, but have no relationship with our IC.

Because the schematic of TPS61094 is no problem.

Regards,

Nathan

0 Jhon Jairo Zambrano over 1 year ago in reply to Nathan Ding

Prodigy 80 points

Hi Nathan, the measures were taken with and without the bulk capacitor

0 Jhon Jairo Zambrano over 1 year ago in reply to Brigitte

Prodigy 80 points

Hi brigitte, the current is similiar to the datasheet if i power only the IC1.

+1 Nathan Ding over 1 year ago in reply to Jhon Jairo Zambrano

TI__Genius 9545 points

Hi Jhon,

Yes, I know it, I mean the current is correct when only powering on IC1, so IC1 works normally, and there should be something wrong with the cap or something other (maybe IC11?) not IC1.

Regards,

Nathan

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TPS61094: IC input issue