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1.8A Line Switch with Low On-Resistance


The EUP3504 is a low dropout line switch IC with ON/OFF control and output current protection which integrates a P-channel MOSFET.

By connecting the EUP3504 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 EUP3504 helps to extend battery life and product operation time.

The EUP3504 contains a current limit protection circuit so these are not required externally unlike discrete circuit solutions where MOSFETs and resistors are used. Externally programmable soft-start allows for proper power on sequencing with respect to other power supplies and avoids input inrush current during startup.

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 EUP3504 contains thermal shutdown protection.


  • ‧3.3V to 13.5V Input Voltage Range
  • ‧110mΩ On Resistance
  • ‧Low 90μA Quiescent Current
  • ‧Low Shutdown Current:<4μA
  • ‧ON/OFF Control Function
  • ‧Externally Programmable Current Soft-Start
  • ‧High Speed Auto Discharge Function
  • ‧Operating Temperature Range: -40°C ~+85°C
  • ‧2.35A 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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