KTS1675

August 2020 - Revision 04e

Page 10

Company Confidential

Functional Description

The KTS1675 is inserted between the power supply or charger source and the load to be protected. The KTS1675

consists of two “back-to-back” low resistance OVP MOSFET switches, under-voltage lockout protection (UVLO),

over-voltage monitors and protection (OVLO), and power good output flags.

The KTS1675 overvoltage protection device features low on-resistance (RDSON) internal FETs and protects low-

voltage systems against voltage faults up to +28VDC. An internal clamp also protects the device from surges up to

+100V. If the input voltage exceeds the overvoltage threshold, the internal FETs are turned off to prevent damage to

the protected components. A 50ms debounce time built into the device prevents false turn on of the internal FET

during startup. The KTS1675 also supports OTG mode where both MOSFETs can be turned-on to provide current

flow from OUT to IN. With OTG mode de-asserted and the switch turned off, the KTS1675 blocks any voltage at OUT

appearing at IN.

The KTS1675 features a VP selector pin, which gives the user two OVP/VSNS voltage options. Connecting VP to

ground, selects an OVP of typically 17V and a maximum VSNS clamp voltage of 20V and when the VP is left to

“FLOAT” selects and OVP of typically 13V and a maximum VSNS clamp voltage of 16V.

Dual Input Device Operation

The addition of a wireless receiver (WRx) with an enable pin allows KTS1675 load switch to implement an equivalent

2:1 power multiplexer (PMUX), see Figure 1. When disabled, the wireless receiver withstand voltage must be greater

than or equal to 20V which is the load switch maximum input operating voltage.

The load switch can transition between OFF state and OTG modes based on the input state (IN adapter and/or WRx).

When the charger detects an OTG plug-in event, the transition to OTG mode is possible.

Figure 1. Dual Input Device Operation

VSNS

IN

GND

KTS1675

Battery Charger

USB_SNS

OUT

Up to 18V VIN

20V VIN (Rated)

EN

̅̅̅̅

USB_EN

FLAG

̅̅̅̅̅̅̅̅

CHGOK

WRX

̅̅̅̅̅̅̅

DC_EN

Wireless

Receiver

Up to 15V VOUT

20V VIN (Rated)

ENABLE

̅̅̅̅̅̅̅̅̅̅̅̅

VP