I would like to use LTC4015 battery charger to charge a Nickel–metal hydride battery.
1) is this IC can support charging NiMH chemistry.
2) NiMH batteries nominally operate at 1.2 V per cell, do I need stacked cells (three cells = 3.6V) to be able to use the charger.
Thank you in advance
I might recommend LTC4011 for your application. This is a NiMH charger with proper termination functions (which I recommend for charging at 1.5A). It is a buck charger without a boost feature, so you will need to follow it with a boost converter.
LTC4010 is a slightly simpler alternative which would also work. I am recommending LTC4011 because it has an input ideal diode (INFET) which will help your charger to be more efficient at your low 5V input.