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Features
• Single-Channel Power Distribution Switch
• Programmable Current Limit in 0.4A~2A Output
Current
• Enable polarity: Active High
• 2.4V to 5.5V Supply Range
• Under-Voltage Lockout
• -40°C to +85°C Ambient Temperature Range
• Accurate Current Limit
• 15μA Quiescent Current
• 80mΩ MOSFET
• Thermal-Shutdown Protection
• Built-In Soft Start
• Available in SOT23-5 Package
Applications
• Set-Top Boxes
• Wi-Fi Router/AP
• USB 3G Datacard/ USB Dongle
• High-Definition Digital TVs
• ONT Boxes
• USB Ports and Hubs, Laptops, and Desktops
• Smartphone and PDA
• MiniPCI Accessories
General Description
The RY2121 Power Distribution Switch features internal current limiting to prevent damage to host devices due to
faulty load conditions. The RY2121 develops ultra-low on-resistance switch with programmable current limiting to
protect the power source from over current and short circuit conditions. It integrates the over temperature protection
and discharges the output capacitor during the shutdown. The RY2121 is available in SOT23-5 package.