LNK305GN — Power Integrations LinkSwitch‑TN Series Offline Switch‑Mode Power IC

The LNK305GN is an integrated offline AC‑to‑DC switching regulator/controller IC from the LinkSwitch‑TN family by Power Integrations. It’s designed to simplify low‑power non‑isolated power supply designs — replacing inefficient linear and capacitor‑dropper supplies with a compact switch‑mode solution. 

🔌 Core Overview

• Type: Offline switch‑mode power supply IC (non‑isolated) 

• Series: LinkSwitch‑TN 

• Package: SMD‑8B (surface mount with gull wing leads) 

• Operating Input: 85 VAC to 265 VAC universal mains 

• Topology: Buck, buck‑boost, or flyback converters 

• Switching Frequency: ~66 kHz 

• Internal MOSFET Block: Yes, with high voltage ~700 V rating 

• Maximum Output Current: ~175 mA (MDCM) / ~280 mA (CCM) 

• Operating Temp: −40 °C to +150 °C (junction)