Datasheet

 2001-2012 Microchip Technology Inc. DS21448D-page 13
TC648
FIGURE 5-6: Output Drive Transistor Circuit Topologies.
TABLE 5-1: TRANSISTORS AND MOSFETS FOR Q
1
(V
DD
= 5V)
Device Package
Max. V
BE(sat)
/V
GS
(V)
Min. H
FE
V
CEO
/V
DS
(V)
Fan Current
(mA)
Suggested
R
BASE
()
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.
Q
1
Q
1
Q
2
GND
V
DD
R
BASE
V
OUT
V
OUT
Fan
a) Single Bipolar Transistor
Q
1
GND
V
DD
V
OUT
C) N-Channel MOSFET
GND
V
DD
R
BASE
Fan
b) Darlington Transistor Pair
Fan