Found 3 alternatives for LCS703LG by Power Integrations. Pmic Full Half Bridge Drivers — 16-SSIP, 13 Leads, Exposed Pad, Formed Leads.
IC LLC CTRL MFET 170W ESIP16C
IC LLC CTRL MFET 350W ESIP16C
IC LLC CTRL MFET 110W ESIP16C