1 Low voltage operation: Start-up is guaranteed from 0.9 V(IOUT =1 mA )2 Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % .3 oscillator frequency ：300KHz4 External parts: coil, diode, capacitor, and transistor5 Output voltage range: 1.5V ~6.5 V6 Output voltage accuracy ：±2%7 Soft start function: 2 ms.8 PACKAGE ：SOT-23-5