TC642

DS21444C-page 14

 2002 Microchip Technology Inc.

TABLE 5-2:

5.6

Latch-up Considerations

As with any CMOS IC, the potential exists for latch-up

if signals are applied to the device which are outside

the power supply range. This is of particular concern

during power-up if the external circuitry (such as the

powered by a supply different from that of the TC642.

supply powers up first. If possible, the networks

supply at the same physical location as the IC itself.

Even if the IC and any external networks are powered

by the same supply, physical separation of the

connecting points can result in enough parasitic

capacitance and/or inductance in the power supply

connections to delay one power supply “routing” versus

another.

Device

Package

(V)

(V)

Fan Current

(mA)

Suggested

MMBT2222A

SOT-23

1.2

50

40

150

800

MPS2222A

TO-92

1.2

50

40

150

800

MPS6602

TO-92

1.2

50

40

500

301

SI2302

SOT-23

2.5

NA

20

500

Note 1

MGSF1N02E

SOT-23

2.5

NA

20

500

Note 1

SI4410

SO-8

4.5

NA

30

1000

Note 1

SI2308

SOT-23

4.5

NA

60

500

Note 1

Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.