Hi Shimizu-san,
Please refer to section 7.4.2.
If current regulation is not needed, pin ISEN should be directly connected to the PCB ground plane. VREF must still be 0.3 to 5 V, and larger voltages provide greater noise margin. This mode provides the highest possible peak current: up to 3.6 A for a few hundred milliseconds (depending on PCB characteristics and the ambient temperature). If current exceeds 3.6 A, the device might reach overcurrent protection (OCP) or overtemperature shutdown (TSD). If that happens, the device disables and protects itself for about 3 ms (tRETRY) and then resumes normal operation.
Please note the VREF input is a high impedance input. Refer to POST for details