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FPF2024

Full Functional Load Switch With 100mA Current Limit

Fairchild Semiconductor 

Current Limiting

The current limit function ensures that the current through the

switch does not exceed a maximum value while not limiting at

less than a minimum value. The minimum current at which the

parts will limit the load current is internally set to 100mA.

The switch current limiting circuitry is active at all times(Sleep

and Wakeup mode) and protects the FPF2024-FPF2027

against excessive load currents in all modes. The proprietary

current limiting circuit responds to an over-current condition in

15 µs (typ).

Undervoltage Lockout (UVLO)

The undervoltage lockout feature turns-off the switch if the input

voltage drops below the undervoltage lockout threshold. With

the ON pin active, the input voltage rising above the

undervoltage lockout threshold will cause a controlled turn-on of

the switch and will limit current over-shoots. The UVLO feature

is disabled during Sleep mode. If device is in the UVLO

condition, FLAGB goes low and indicates the fault. If the input

voltage goes below UVLO voltage but remains above 1.3V (typ)

during Sleep mode, the switch is kept on until the next Wakeup

cycle, where the UVLO violation will be detected. If the input

voltage falls below 1.3V in Sleep mode, the switch is

immediately turned off.

Thermal Shutdown

The Thermal Shutdown protects the device from internally or

externally generated excessive temperatures. The Thermal

shutdown feature is disabled during Sleep mode. However,

excessive load currents that may result in high power dissipa-

tion will be detected during Sleep mode and will activate the full-

function Wakeup mode, which has thermal shutdown protection.

During an over-temperature condition the FLAGB is pulled low

and the switch is turned-off. If the temperature of the die drops

below the threshold temperature, the switch automatically turns-

on again, To avoid unwanted thermal oscillations, a 10°C (typ)

thermal hysteresis is implemented between thermal shutdown

entry and exit temperatures.

©2008 Fairchild Semiconductor Corporation

10

FPF2024/5/6/7 Final. B

www.fairchildsemi.com

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