 Low voltage operation: Start-up is guaranteed from 0.9 V(IOUT=1 mA )  Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % .  oscillator frequency：1.0MHz  Output voltage range: 1.5V ~6.5 V  Output voltage accuracy：±2%  Soft start function: 2 mS.  PACKAGE：SOT23-5,SOT89-5,SOP8