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2A Line Switch with Low On-Resistance


The EUP3512A/B is a low dropout line switch IC with ON/OFF control and output current protection which integrates a P-channel MOSFET. It can deliver current up to 2A.

By connecting the EUP3512A/B 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 EUP3512A/B helps to extend battery life and product operation time.The EUP3512A/B 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 EUP3512A/B contains over current protection.

The device has a SS pin dedicated to soft-start ramp-up rate control that can be used in application where the inrush current is concerned .The EUP3512A/B eliminates any reversed current flow across the switch when it is powered off.

The EUP3512A/B is available in SOT23-5 packages,operates over the extended (-40°C to +85°C) temperature range.


  • ‧80mΩ(typ.) Power MOSFET
  • ‧Operating Range : 2.7V to 5.5V
  • ‧Deliver Current up to 2A
  • ‧Under Voltage Lockout
  • ‧24μA Quiescent Current
  • ‧1μA Maximum Shutdown Current
  • ‧No Reverse Current when Power Off
  • ‧Soft_Start Time Programmable by External capacitor
  • ‧Output Shutdown Pull-low Resistor
  • ‧Enable Active-High
  • ‧Available in SOT23-5
  • ‧RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free


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