I was recently searching for NiMH charging ICs, turns out they basically don't exist. Most devices which charge their NiMH batteries implement low CC charging, which is slow. It's a shame, because NiMH batteries do have their advantages (safety, ease of finding replacements, etc.) and can be recharged fairly quickly if the charger is smart enough.
I'm not sure what IC they use, but it uses a two-line text display and can switch between Lipo, LiFE, NiMH, NiCD, Pb, and a few other modes, and some of them allow adjustable cutoff voltage, max charge time, etc. That's just a cheap 80W model but there are 200W+ chargers that use the same interface.
I have done similar searches before. They do exist, but most dedicated ICs are targeted towards tightly-integrated cells or battery packs. The variety available is much smaller than for Li-ion batteries, and the ICs are more expensive.
It seems like commercial multi-cell battery chargers mostly use custom microcontrollers to achieve this, instead of multiple charging ASICs.
