FAN3989 − USB/Charger Detection Device with Load Switch


The FAN3989 is a USB connection monitoring device used to determine if a standard USB device is connected or a battery-changing device is connected.     The FAN3989 sets the FLAG1 pin to logic HIGH or LOW as an indicator to the system controller that a standard USB device or a charger is connected to the USB port. The FAN3989 also monitors the VBUS for over- or under-voltage conditions. The FLAG2 pin is set LOW if VBUS is less than 3.3V or greater than 6.0V. The internal load switch control pin is set HIGH if VBUS is less than 3.3V or greater than 6.0V, turning off the PMOS switch.The FAN3989 is available in a very small 8-lead MLP package suitable for small board space applications, like mobile phones.

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Product Status/Pricing/Packaging

Product Product & Eco Status *Pricing Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
0 FAN3989MLP8X Full Production
Green as of Dec 2007
$0.616  Details
0.8 x 3 x 3mm

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code) &K
Line 2:3989
ESD (CDM) :  1000  V
ESD (HBM) :  4000  V
Moisture Sensitivity Level (MSL) :  1  
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  • Charger/USB Detection Device with Load Switch
  • Charger/USB Device Detection Flag
  • Over/Under-Voltage Detection Flag
  • Load Switch Output, Up to 1.5A Charge Current
  • VBUS Supply: 2.7V to 20V
  • CON of 1.5pF
  • Package: 8-Lead MLP


  • Mobile Handsets
  • External AC-DC Merchant Power Supply - Wireless Communications

Application Notes

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