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1.5A Line Switch with Low On-Resistance


The EUP3502A is a low dropout line switch IC with ON/OFF control and output current protection which integrates a P-channel MOSFET.

By connecting the EUP3502A to the output pin of a step-down DC/DC converter, the EN pin controls ON/OFF for each distribution switch to deliver power per requirements and maximize total power efficiency. As a result, the EUP3502A helps to extend battery life and product operation time.

The EUP3502A contains a current limit and protection circuit so these are not required externally unlike discrete circuit solutions where MOSFETs and resistors are used.

When a low signal is input to the EN pin, the IC enters shutdown mode. Even where a load capacitor is connected to the output pin during shutdown, the electric charge stored at the load capacitor is discharged through the internal switch. As a result, the VOUT pin voltage falls quickly to the GND level. The EUP3502A contains over current protection.


  • ‧2.5V to 5.5V Input Voltage Range
  • ‧100mΩ On Resistance
  • ‧Low Shutdown Current:<1μA
  • ‧ON/OFF Control Function
  • ‧High Speed Auto Discharge Function
  • ‧Operating Temperature Range: -40°C ~+85°C
  • ‧Output Current Limit
  • ‧Thermal Shutdown
  • ‧RoHS Compliant and 100% Lead (Fb)-Free Halogen-Free


  • ‧Portable Equipment
  • ‧Laptop, Palmtops, Notebook Computers
  • ‧LCD Monitor TV
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