I am looking for a solution from ADI that can automatically switchover from a battery to a wall adapter with a battery charger.
Actually I found a LTC4413 with LTC4059A solution that is exacally fit my topology requirement, refer to https://www.analog.com/media/en/reference-design-documentation/design-notes/dn356f.pdf,
However, my spes is quite different: the li-battery is 6S (22.2V), and the load current will reach 20A, may I check whether Linear tech have some solution for my application?
Thanks and best regards
Hi Gao, For the supply switchover part of your application, please consider these possibilities:
- LTC4418: 2-channel prioritizer. 2.5V to 40V operating range. Controls external back-to-back P-channel MOSFETs. http://www.analog.com/LTC4418
- LTC4359: Single ideal diode controller. 4V to 80V operating range. Controls external single or back-to-back N-channel MOSFETs. You will need one LTC4359 per supply input. You can control turn-on/off using the LTC4359's SHDN# pin, possibly driving it with the output of a voltage supervisor on the wall adapter voltage. http://www.analog.com/LTC4359
Thanks, sir, I will look into them...
Btw, for my another application, I found that there is a current balancing IC LTC4370, but it is with the 0V to 18V High Side Operation scale, if my application is with the scale 20~60V, do you have any idea on the solution?
Hi Gao, For above 18V, we only have ideal diode controllers such as LTC4357 (single), LTC4359 (single), or LTC4355 (dual) but no current balancing IC. With ideal diode controllers, there will be some droop sharing based on board trace and MOSFET resistances (not well controlled) when supply voltages are very close.
Noted that, sir, thanks a lot...
Dear Sir, Thank you for your patient... now I have narrowed down my solution to either LTC4359 or LTC4355, prefer LTC4355. one more question is, LTC4359 support back-to-back N Mosfet, shown below. Does LTC4355(dual) support the back-to-back N Mosfet also (can not find the statement in the datasheet)? I need the mosfet to be as the load switch ...