TC642 Microchip, TC642 Datasheet - Page 14

• Manufacturer Part Number: TC642
• Description: PWM Fan Speed Controller
• Manufacturer: Microchip

TC642
TABLE 5-2:
5.6
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
sensor network, V
powered by a supply different from that of the TC642.
Care should be taken to ensure that the TC642’s V
supply powers up first. If possible, the networks
attached to V
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.
DS21444C-page 14
MMBT2222A
MPS2222A
MPS6602
SI2302
MGSF1N02E
SI4410
SI2308
Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.
Device
Latch-up Considerations
IN
and V
TRANSISTORS AND MOSFETS FOR Q
MIN
Package
SOT-23
SOT-23
SOT-23
SOT-23
TO-92
TO-92
SO-8
MIN
divider or shutdown circuit) is
should connect to the V
Max. V
BE(sat)
(V)
1.2
1.2
1.2
2.5
2.5
4.5
4.5
/V
GS
DD
DD
Min. H
NA
NA
NA
NA
50
50
50
1
FE
(V
DD
V
CEO
= 5V)
(V)
40
40
40
20
20
30
60
/V
DS
Fan Current
(mA)
1000
150
150
500
500
500
500
2002 Microchip Technology Inc.
Suggested
R
BASE
Note 1
Note 1
Note 1
Note 1
800
800
301
( )