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which is best Alternative for LMZ34202

Other Parts Discussed in Thread: LMZ34202, TPS54227, TPS54228

Dear Experts,

now i am working for vehicle  tracking system that components need max 2A, so i was choosed LMZ34202 but that component cost is 800/INR, so it makes my module development cost is too high,

i want must change this to low  cost converter, can anyone please suggest alternative for my need.

Input volt- 10 to 18v 

output range is 4.2v and 5v is enough.

current ratings- max 2A.

Sleep mode is optional.

thanks,