3-1. Glossary of terms used in the datasheets for load switch ICs

Input voltage

V_IN

The input voltage range in which a load switch IC operates properly

Quiescent current (ON state)

I_Q

The amount of quiescent current that flows through a load switch IC when it is on

Quiescent current (OFF state)

I_Q(OFF)

The amount of quiescent current that flows through a load switch IC when it is off

Switch leakage current (OFF state)

I_SD(OFF)

The amount of leakage current flowing out of the V_OUT pin when a load switch IC is off

CONTROL High-level input voltage

V_IH

The minimum voltage at which the Control pin of a load switch IC is regarded as being in the logic High state

CONTROL Low-level input voltage

V_IL

The maximum voltage at which the Control pin of a load switch IC is regarded as being in the logic Low state

On-resistance

R_ON

On-resistance between the drain and source of the MOSFET connected between the V_IN and V_OUT pins

Reverse blocking current

I_RB

The amount of current that flows into a load switch IC from the V_OUT pin when the voltage at the V_OUT pin is higher than the voltage at the V_IN pin

Reverse blocking voltage threshold

V_RB

The difference in voltage between the V_OUT and V_IN pins (V_OUT-V_IN) at which the reverse-current blocking circuit is tripped when V_OUT > V_IN. V_RB is specified for load switch ICs with a true reverse-current blocking function.

Reverse blocking release voltage threshold

V_RBR

The difference in voltage between the V_OUT and V_IN pins (V_OUT-V_IN) at which the reverse-current blocking circuit is disabled when V_IN rises back above V_OUT after it is tripped. V_RBR is specified for load switch ICs with a true reverse-current blocking function.

Undervoltage lockout (UVLO) rising threshold

V_{UVL_RI}

The threshold voltage at which UVLO is disabled when V_IN rises. A load switch IC turns on when V_IN exceeds V_{UVL_RI}.

Undervoltage lockout (UVLO) falling threshold

V_{UVL_FA}

The threshold voltage at which UVLO is tripped when V_IN falls. A load switch IC is disabled when V_IN drops below V_{UVL_FA}.

Overvoltage lockout (OVLO) rising threshold

V_{OVL_RI}

The threshold voltage at which OVLO is tripped when V_IN rises. A load switch IC is disabled when V_IN exceeds V_{OVL_RI}.

Overvoltage lockout (OVLO) falling threshold

V_{OLV_FA}

The threshold voltage at which OVLO is disabled when V_IN falls. A load switch IC is enabled when V_IN falls below V_{OLV_FA}.

Output discharge on-resistance

R_SD

The on-resistance of the internal N-channel MOSFET connected between the V_OUT and GND pins of a load switch IC for discharging the external smoothing capacitor connected to the V_OUT pin

Output limited current

I_CL

The current level to which the output current is limited by the overcurrent protection function