The KTS1682 over-voltage protection (OVP) device features an ultra-low 38mΩ (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 over-voltage 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 KTS1682 automatically chooses the internal fixed OVLO threshold, preset to 9.98V (typical). The overvoltage protection threshold can be adjusted with optional resistor divider to a voltage between 4V and 22V.

The device features a microphone mode which disables the OVP switch and allows the microphone signal present on the input to be output at VDET pin without an additional multiplexer circuit. The KTS1682 is protected against overcurrent faults by an internal over-temperature protection shutdown feature.

The KTS1682 is available in a RoHS and Green compliant 12-Bump 1.288mm x 1.988mm x 0.64mm WLCSP


  • Wide Input voltage range: 2.3V to 28V
  • Up to 4A Continuous current capability
  • Integrated 38mΩ (typ) N-Channel MOSFET
  • Wide Overvoltage threshold range
    • Fixed internal: 9.98V
    • Adjustable: 4V to 22V
  • Fast OVP response time: 0.1µs (typ.)
  • Microphone Mode for audio signal on IN
  • Internal 15ms Startup Debounce
  • Integrated Surge Protection up to 100V
  • Low Quiescent Current: 120µA (typ.)
  • Thermal Shutdown and Short Circuit Protection
  • Compliance to IEC61000-4-2 (Level 4)
    • Contact: ±8kV
    • Air Gap: ±15kV
  • ESD Protection
    • Human Body Model: ±2kV
  • Pb-free Package: 12-Bump WLCSP
  • -40°C to +85°C Temperature Range


  • Smartphones
  • Tablet
  • Mobile Internet Devices, Peripherals

Packaging Information

Package Dimensions Bumps Package Code
WLCSP34-12 1.98mm x 1.28mm x 0.64mm 12 AY


Vin (min) Vin (max) ON Resistance Max Current (A)
2.3V 28V 38mΩ 4.5A

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP34-12 KTS1681 AY PODPDF


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