The following table provides the definitions of major electrical characteristics shown in the datasheets of load switch ICs.
Characteristic |
Symbol |
Description |
---|---|---|
Input voltage |
VIN |
The input voltage range in which a load switch IC operates properly |
Quiescent current (ON state) |
IQ |
The amount of quiescent current that flows through a load switch IC when it is on |
Quiescent current (OFF state) |
IQ(OFF) |
The amount of quiescent current that flows through a load switch IC when it is off |
Switch leakage current (OFF state) |
ISD(OFF) |
The amount of leakage current flowing out of the VOUT pin when a load switch IC is off |
CONTROL High-level input voltage |
VIH |
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 |
VIL |
The maximum voltage at which the Control pin of a load switch IC is regarded as being in the logic Low state |
On-resistance |
RON |
On-resistance between the drain and source of the MOSFET connected between the VIN and VOUT pins |
Reverse blocking current |
IRB |
The amount of current that flows into a load switch IC from the VOUT pin when the voltage at the VOUT pin is higher than the voltage at the VIN pin |
Reverse blocking voltage threshold |
VRB |
The difference in voltage between the VOUT and VIN pins (VOUT-VIN) at which the reverse-current blocking circuit is tripped when VOUT > VIN. VRB is specified for load switch ICs with a true reverse-current blocking function. |
Reverse blocking release voltage threshold |
VRBR |
The difference in voltage between the VOUT and VIN pins (VOUT-VIN) at which the reverse-current blocking circuit is disabled when VIN rises back above VOUT after it is tripped. VRBR is specified for load switch ICs with a true reverse-current blocking function. |
Undervoltage lockout (UVLO) rising threshold |
VUVL_RI |
The threshold voltage at which UVLO is disabled when VIN rises. A load switch IC turns on when VIN exceeds VUVL_RI. |
Undervoltage lockout (UVLO) falling threshold |
VUVL_FA |
The threshold voltage at which UVLO is tripped when VIN falls. A load switch IC is disabled when VIN drops below VUVL_FA. |
Overvoltage lockout (OVLO) rising threshold |
VOVL_RI |
The threshold voltage at which OVLO is tripped when VIN rises. A load switch IC is disabled when VIN exceeds VOVL_RI. |
Overvoltage lockout (OVLO) falling threshold |
VOLV_FA |
The threshold voltage at which OVLO is disabled when VIN falls. A load switch IC is enabled when VIN falls below VOLV_FA. |
Output discharge on-resistance |
RSD |
The on-resistance of the internal N-channel MOSFET connected between the VOUT and GND pins of a load switch IC for discharging the external smoothing capacitor connected to the VOUT pin |
Output limited current |
ICL |
The current level to which the output current is limited by the overcurrent protection function |