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TIDA-050039 and TIDA-00242 which is better

Other Parts Discussed in Thread: TIDA-00242, TIDA-050039

which design is better for solar power harvesting... i need to charge a lipo battery of 4.2V using a small solar cell.. i have seen the design TIDA-050039 and TIDA-00242 schematic is not clear to me so i need help in this case and which design is better ..