Why do charge pumps used in HDMI and USB OTG interfaces? Will it be used only if there is less than 5V supply on the particular system? Or all HDMI and OTG interfaces has charge pump??
the charge pump or boost is mainly used to generate 5V for the HDMI and USB OTG
Best RegardsJasper LiBoost Converter Solution
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In reply to Jasper Li:
Thanks Jasper Li,
Yes . It is used to generate 5V. But eventhough there is readily 5V available some circuits feed that 5V to chargepump and connect the output of chargepump to HDMI or OTG. Some were saying , it is because of if there is any dip in the 5V the chargepump can provide stable 5V output ? Is it the only reason??
Note: HDMI cause many issue if voltage is not stable <- this is the information i have heard. Please confirm this as well..
Thanks for your reply in advance..!!!
In reply to Vignesh M26:
do you have the part number of the charge pump? a charge pump circuit normally generate 2*VIN or -VIN.
It is fixed output voltage charge pump. PN is TPS60151DRVR.
HDMI or USB OTG require a 5 V output voltage. If your device's supply is not well regulated (e.g., a battery), then you need to add a 5 V regulator. (See section 9.1 of the datasheet).
Charge pumps are used for this because they work well with relatively low output currents, and do not need much space. It would also be possible to use a conventional boost converter with an inductor.
If you already have a 5 V supply, an additional charge pump is not necessary.
i guess the original 5V is not stable. and the TPS60151 can help to provide a stable 5V. this charge pump could regulate output voltage.
Yes. As I thought, it is used only for provide stable output.
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