Lenovo ThinkPad Ideadpad Yoga 20V AC Adapter/Charger ADLX90NLC3A 0B46994 45N0305 45N0235 45N0247 45N0251 90W

Check connector to make sure its similar to yours.

Product Description

Features:
Input voltage: 100-240V ~ 1.5A, 50 - 60Hz
Output voltage: 20V ~ 4.5A    90W
DC connector: USB style connector (not for USB ports)
Includes power cable