LTC1422
U
W U U
APPLICATIONS INFORMATION
Power N-Channel and Sense Resistor Selection
Table 2 lists some current sense resistors that can be
used with the circuit breaker. Since this information is
subject to change, please verify the part numbers with the
manufacturer. Table 3 lists the web sites of several manu-
facturers.
The decision of which external power N-Channel to use is
dependent on its maximum current rating and the maxi-
mum allowed current times RDS(ON) drop across the
transistor. Table1listssometransistorsthatareavailable.
Table 1. N-Channel Selection Guide
CURRENT LEVEL (A)
PART NUMBER
DESCRIPTION
Dual N-Channel SO-8
= 0.1Ω
MANUFACTURER
0 to 2
MMDF3N02HD
ON Semiconductor
R
DS(ON)
2 to 5
MMSF5N02HD
MTB50N06V
Single N-Channel SO-8
= 0.025Ω
ON Semiconductor
ON Semiconductor
ON Semiconductor
R
DS(ON)
5 to 10
10 to 20
Single N-Channel DD Pak
= 0.028Ω
R
DS(ON)
MTB75N05HD
Single N-Channel DD Pak
= 0.0095Ω
R
DS(ON)
Table 2. Sense Resistor Selection Guide
CURRENT LIMIT VALUE
PART NUMBER
LR120601R050
LR120601R025
LR120601R020
WSL2512R015F
LR120601R010
WSR2R005F
DESCRIPTION
MANUFACTURER
IRC-TT
1A
0.05Ω 0.25W 1% Resistor
0.025Ω 0.25W 1% Resistor
0.02Ω 0.25W 1% Resistor
0.015Ω 1W 1% Resistor
0.01Ω 0.25W 1% Resistor
0.005Ω 2W 1% Resistor
2A
IRC-TT
2.5A
3.3A
5A
IRC-TT
Vishay-Dale
IRC-TT
10A
Vishay-Dale
Table 3. Manufacturers’ Web Sites
MANUFACTURER
WEB SITE
TEMIC Semiconductor
International Rectifier
ON Semiconductor
Harris Semiconductor
IRC-TT
www.temic.com
www.irf.com
www.onsemiconductor.com
www.semi.harris.com
www.irctt.com
Vishay-Dale
www.vishay.com
1422fb
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Linear [ Linear ]
