BQ25505: BQ25505 input/output graph

Dean Allaway

Prodigy 60 points

Part Number: BQ25505

Do you have a input vs output graph?

over 6 years ago

0 Jeff F over 6 years ago

TI__Guru**** 167196 points

Dean,

Datasheet figures 18, 30 and 36 show both VIN_DC and VSTOR, zoomed in during charging. Figures 14 and 15 doesn't show VIN_DC but show a zoomed out view of VSTOR and VBAT charging. The boost converter output at VSTOR is a function of VBAT voltage and load on VSTOR.

0 Dean Allaway over 6 years ago in reply to Jeff F

Prodigy 60 points

what output can I expect from 0.8v and 1.2mA input?

0 Jeff F over 6 years ago in reply to Dean Allaway

TI__Guru**** 167196 points

Dean,

You set the desired output voltage with the VBAT_OV resistors. If your question is how much output current can I get with VBAT_OV=VSTOR=4.2V and the inputs above, you can use a power balance to estimate: eff=Po/Pi=(VSTOR*ISTOR)/(0.8V*1.2mA) where eff is pulled from the datasheet efficiency curves 2 and 3 (~82%).

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BQ25505: BQ25505 input/output graph