LTC1422_15 Datasheet, PDF (12/16 Pages) Linear Technology – Hot Swap Controller

LTC1422
APPLICATIONS INFORMATION
Power N-Channel and Sense Resistor Selection
The decision of which external power N-Channel to use is
dependent on its maximum current rating and the maxi-
mum allowed current times R_DS(ON) drop across the
transistor. Table 1 lists some transistors that are available.
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.
Table 1. N-Channel Selection Guide
CURRENT LEVEL (A)
PART NUMBER
0 to 2
MMDF3N02HD
2 to 5
MMSF5N02HD
5 to 10
MTB50N06V
10 to 20
MTB75N05HD
DESCRIPTION
Dual N-Channel SO-8
R_DS(ON) = 0.1Ω
Single N-Channel SO-8
R_DS(ON) = 0.025Ω
Single N-Channel DD Pak
R_DS(ON) = 0.028Ω
Single N-Channel DD Pak
R_DS(ON) = 0.0095Ω
MANUFACTURER
ON Semiconductor
ON Semiconductor
ON Semiconductor
ON Semiconductor
Table 2. Sense Resistor Selection Guide
CURRENT LIMIT VALUE
PART NUMBER
1A
LR120601R050
2A
LR120601R025
2.5A
LR120601R020
3.3A
WSL2512R015F
5A
LR120601R010
10A
WSR2R005F
DESCRIPTION
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
MANUFACTURER
IRC-TT
IRC-TT
IRC-TT
Vishay-Dale
IRC-TT
Vishay-Dale
Table 3. Manufacturers’ Web Sites
MANUFACTURER
TEMIC Semiconductor
International Rectifier
ON Semiconductor
Harris Semiconductor
IRC-TT
Vishay-Dale
WEB SITE
www.temic.com
www.irf.com
www.onsemiconductor.com
www.semi.harris.com
www.irctt.com
www.vishay.com
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