The KTS1663 overvoltage protection device features an ultra-low 26mΩ (typical) on-resistance high current integrated MOSFET which actively protects low-voltage systems from voltage supply faults up to +40V.

An input voltage exceeding the overvoltage threshold will cause the internal MOSFET to turn off, preventing excessive voltage from damaging downstream devices.

The KTS1663 offers three different fixed OVP options, plus a fully adjustable option. When the OVLO input is connected to GND, the KTS1663 automatically chooses the internal fixed OVLO threshold, preset to 5.95V (typical). Allowing OVLO to float, gives a preset of 10.2V (typical) and connecting a resistor to GND between 30kΩ and 80kΩ gives a preset of 13.5V (typical) The overvoltage protection threshold can also be fully adjusted with an optional external resistor divider to a voltage between 4V and 28V.

The KTS1663 features an open-drain output POK indicating a stable supply between the minimum supply voltage and OVLO threshold. In addition, a VDET output is provided to indicate the presence of a voltage at VBUS and is independent of the OVP switch. In case the device temperature exceeds the maximum junction temperature, the device switches off.

The KTS1663 is available in a RoHS and Green compliant 12-Bump 1.28 x 1.94 x 0.62mm WLCSP.


  • Wide Input voltage range: 2.5V to 40V
    • Up to 4.5A current capability
    • Integrated 26mΩ (typ) N-Channel MOSFET
    • Fast OVP turn-off response time: 100ns
  • Selectable trip-point options
    • Fixed 5.95V
    • Fixed 10.2V
    • Fixed 13.5V
    • Adj. 4V to 28V
  • Auto-enabled switch with 18ms debounce time
  • Under voltage (UVLO), Short-circuit and thermal shutdown protection
  • Open-drain power good output
  • VDET output to indicate the presence of VBUS
  • ESD Protection
    • Human Body Model: ±2.0kV
  • Pb-free WLCSP-12 package
  • -40°C to +85°C Temperature Range


  • Smartphones
  • Mobile Internet Devices
  • Tablet Computers
  • Peripherals

Packaging Information

Package Dimensions Bumps Package Code
WLCSP34-12 1.940mm x 1.280mm x 0.620mm 12 UW


Vin (Min) Vin (Max) Switching Frequency (MHz) Output Auto-Discharge Max Current (A) Package
2.5V 40V 4.5 WLCSP12 1.28mm x 1.94mm x 0.62mm

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP34-12 UW PODPDF


Part Number Marking Operating Temperature Package
Purchase Options
Buy from Digi-Key
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