25
LTC4221
4221fa
TYPICAL APPLICATIO S
Simultaneous Turn-On with Autoretry FunctionIndividual Current Limits
ON2
FAULT
GND
LTC4221
Z1
Z2
1
16
7
10
9
8
FB2
PWRGD2
PWRGD1
PWRGD2
V
OUT1
5V
5A
V
OUT2
3.3V
2.5A
PWRGD1
FB1
LONG
LONG
GND
LONG
Z1, Z2: SMAJ10
TIMER
FILTER
2
3
4
15
14
13
12
11
6
5
ON1
V
CC1
SENSE1 GATE1 V
CC2
SENSE2 GATE2
V
CC1
5V
V
CC2
3.3V
BACKPLANE
CONNECTOR
(FEMALE)
PCB EDGE
CONNECTOR
(MALE)
R
X1
10?/DIV>
R
X2
10?/DIV>
R3
15k
R2
21k
R1
3.16k
R
F3
20k
Q2
IRF7413
R
F4
5.11k
R
PG2
10k
R
PG1
10k
R
F1
32.4k
R
F2
5.11k
4221 TA02
C
X1
100nF
C
FILTER
1nF
C
TIMER
470nF
C
X2
100nF
Q1
IRF7413
R
SENSE1
0.004?/DIV>
R
SENSE2
0.007?/DIV>
APPE DIX
Table 2. N-Channel Selection Guide
CURRENT LEVEL (A)
PART NUMBER
DESCRIPTION
MANUFACTURER
0 to 2
MMDF3N02HD
Dual N-Channel SO-8
ON Semiconductor
R
DS(ON)
 = 0.1? C
ISS
 = 455pF
2 to 5
MMSF5N02HD
Single N-Channel SO-8
ON Semiconductor
R
DS(ON)
 = 0.025? C
ISS
 = 1130pF
5 to 10
MTB50N06V
Single N-Channel DD Pak
ON Semiconductor
R
DS(ON)
 = 0.028? C
ISS
 = 1570pF
10 to 20
MTB75N05HD
Single N-Channel DD Pak
ON Semiconductor
R
DS(ON)
 = 0.0095? C
ISS
 = 2600pF
Table 3. Manufacturers Web Sites
MANUFACTURER
WEB SITE
TEMIC Semiconductor
www.temic.com
International Rectifier
www.irf.com
ON Semiconductor
www.onsemi.com
Harris Semiconductor
www.semi.harris.com
IRC-TT
www.irctt.com
Vishay-Dale
www.vishay.com
Vishay-Siliconix
www.vishay.com
Diodes, Inc.
www.diodes.com
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