 2002 Microchip Technology Inc.

DS21448C-page 13

TC648

FIGURE 5-6:

Output Drive Transistor Circuit Topologies.

TABLE 5-1:

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.

GND

Fan

a) Single Bipolar Transistor

GND

C) N-Channel MOSFET

GND

Fan

b) Darlington Transistor Pair

Fan