TMUX7348FPWR datasheet(29/64 Pages) TI1

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8.3 On-Leakage Current

Source on-leakage current (IS(ON)) and drain on-leakage current (ID(ON)) denote the channel leakage currents

when the switch is in the on state. IS(ON) is measured with the drain floating, while ID(ON) is measured with the

source floating. Figure 8-3 shows the circuit used for measuring the on-leakage currents.

VDD VSS

VFP VFN

GND

IS(ON)

GND

N.C.

VDD VSS

VFP VFN

GND

ID(ON)

GND

N.C.

Figure 8-3. On-Leakage Measurement Setup

8.4 Input and Output Leakage Current Under Overvoltage Fault

If the voltage for any of the source pins rises above the fault supplies (VFP or VFN), the overvoltage protection

feature of the TMUX7348F and TMUX7349F is triggered to turn off the switch under fault, keeping the

fault channel in high-impedance state. IS(FA) and ID(FA) denotes the input and output leakage current under

overvoltage fault conditions, respectively. For ID(FA), the device is disabled to measure leakage current on the

drain pin without being impacted by the 40 kΩ impedance to the fault supply. When the overvoltage fault occurs,

the supply (or supplies) can either be in normal operating condition (Figure 8-4) or abnormal operating condition

(Figure 8-5). During abnormal operating condition, the supply (or supplies) can either be unpowered (VDD=

VSS = VFN = VFP = 0 V) or floating (VDD= VSS = VFN = VFP = no connection), and remains within the leakage

performance specifications.

IS (FA)

GND

ID (FA)

N.C.

IS(FA) / ID(FA)

( |VS| > |VFP + VT| or |VFN - VT| )

VDD

VSS

VFP

VFN

Figure 8-4. Measurement Setup for Input and Output Leakage Current under Overvoltage Fault with

Normal Supplies

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TMUX7348F, TMUX7349F

SCDS400B – MARCH 2022 – REVISED JULY 2023

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