FPF2163 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

View to exact match

FPF2163

Full Function Load Switch with Adjustable Current Limit

Fairchild Semiconductor 

This is more power than the package can dissipate, but the

thermal shutdown of the part will activate to protect the part from

damage due to excessive heating. When using the FPF2164,

attention must be given to the manual resetting of the part. The

junction temperature will only be able to increase to the thermal

shutdown threshold. Once this temperature has been reached,

toggling ON will not turn-on the switch until the junction

temperature drops. For the FPF2165, a short on the output will

cause the part to operate in a constant current state dissipating

a worst case power of,

P(max) = VIN(max) × ILIM(max)

(4)

= 5.5 × 1.5 = 8.25W

This large amount of power will activate the thermal shutdown

and the part will cycle in and out of thermal shutdown so long as

the ON pin is active and the short is present.

Board Layout

For best performance, all traces should be as short as possible.

To be most effective, the input and output capacitors should be

placed close to the device to minimize the effects that parasitic

trace inductances may have on normal and short-circuit

operation. Using wide traces for VIN, VOUT and GND will help

minimize parasitic electrical effects along with minimizing the

case to ambient thermal impedance.

11

FPF2163/4/5 Rev. C3

www.fairchildsemi.com

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