Hello Kaizawa-san,
I apologize for the delay. Please read answer to your questions.
1) How to measure IOUT? Did you use current probe for OUT1 or OUT2 wire?
I measured Iout with a current probe, OUT1 wire.
2) What kind of load is connected at OUT1/OUT2?
I connected a small motor to OUT1/OUT2. Rating: 3.7V max R= 1.4ohms, no load on motor since we were trying to prove device can drive at such low voltage.
I hope this helps, thank you very much.