The KTS1680A overvoltage protection device features an ultra-low 28mΩ (typical) on-resistance high current integrated MOSFET which actively protects low-voltage systems from voltage supply faults up to +28VDC. An internal clamp protects the device from surges up to 100V.

An input voltage exceeding the overvoltage threshold will cause the internal MOSFET to turn off, preventing excessive voltage from damaging downstream devices. When the OVLO input set below the external OVLO select voltage, the KTS1680A automatically chooses the internal fixed OVLO threshold, preset to 5.95V (typical). The overvoltage protection threshold can be adjusted with optional resistor divider to a voltage between 4V and 25V.

The device features an open-drain output ACOK indicating a stable supply between the minimum supply voltage and OVLO threshold. The KTS1680A is also protected against over-current faults and has thermal protection.

The KTS1680A is available in a RoHS and Green compliant 12-Bump 1.70mm x 1.21mm x 0.62mm WLCSP.


  • Surge and ESD protected Input
    • Surge Protection
      • IEC 61000-4-5: > 100V
    • ESD Protection
      • IEC 61000-4-2 (Level 4)
        • Contact: ±8kV
        • Air Gap: ±15kV
      • Human Body Model: ±2kV
  • Wide Input voltage range
    • 2.3V to 28V
  • Low Quiescent Current: 80µA (typ.)
  • Integrated 28mΩ (typ) N-Channel MOSFET
  • Fast turn-off response time
    • 100ns
  • Flexible trip-point options
    • Fixed 5.95V
    • Adj. 4V to 25V
  • Auto-enabled switch with typ. 15ms debounce time
  • Additional Under voltage (UVLO), Short-circuit and Thermal shutdown protection
  • Open-drain power good output
  • Pb-free WLCSP34-12 package
  • -40°C to +85°C Temperature Range


  • Smartphones
  • Tablet Computers
  • Mobile Internet Devices
  • Peripherals

Packaging Information

Package Dimensions Bumps Package Code
WLCSP34-12 1.70mm x 1.21mm x 0.62mm 12 UZ


Vin (min)  Vin (max)  ON Resistance Max Current (A) OVP Trip Point
2.3V 28V 28mΩ 4.5A Fixed 5.95V
Adj. 4V to 25V

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP34-12 PODPDF


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