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LTC4211CS8 Datasheet(PDF) 24 Page - Linear Technology

Part # LTC4211CS8
Description  Hot Swap Controller with Multifunction Current Control
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4211CS8 Datasheet(HTML) 24 Page - Linear Technology

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24
LTC4211
4211f
APPLICATIO S I FOR ATIO
A more elaborate connection sense scheme is shown in
Figure 16. The bases of Q1 and Q2 are wired to short pins
located on opposite ends of the edge connector because
the installation/removal of printed circuit cards generally
requires rocking the card back and forth. When VCC
makes connection, the bases of transistors Q1 and Q2 are
pulled high, biasing them ON. When either one of them is
ON, the LTC4211’s ON pin is held low, keeping the
LTC4211 OFF. When both the short base connector pins
+
VCC
RESET
SENSE
ON
R5
15k
LTC4211
GATE
FB
8
7
6
5
4211 F13
1
2
4
3
CTIMER
10nF
GND
TIMER
R4
36k
VOUT
5V
5A
Q1
Si4410DY
RSENSE
0.007
Ω
COUT
R6
10k
Z1*
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
R1
10
Ω
C1
0.1
µF
R2
10k
VIN
5V
SHORT
LONG
5V
VCC
RESET
LONG
PCB EDGE
CONNECTOR
(MALE)
SHORT
BACKPLANE
CONNECTOR
(FEMALE)
+
VCC
SENSE
ON
R2
100k
RESET
LTC4211
GATE
FB
7
8
6
1
5
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
4211 F14
2
4
3
CTIMER
10nF
R3
10k
GND
TIMER
RESET
VOUT
5V
5A
Q1
Si4410DY
RSENSE
0.007
Ω
COUT
R1
36k
R4
10k
R5
10k
PCB
CONNECTION
SENSE
RX
10
Ω
CX
0.1
µF
Z1*
VIN
5V
SHORT
LONG
SHORT
PCB EDGE
CONNECTOR
(MALE)
LONG
SHORT
BACKPLANE
CONNECTOR
(FEMALE)
Q2
R7
15k
Figure 13. Hot Swap Controller On Daughter Board (Staggered Pin Connections)
Figure 14. Hot Swap Controller on Backplane (Staggered Pin Connections)
of Q1 and Q2 finally mate to the backplane, their bases are
grounded, biasing the transistors OFF. The ON pin volt-
age is then pulled high by R3 enabling the LTC4211 and
a power-up cycle begins.
A software-initiated power-down cycle can be started by
momentarily driving transistor M1 with a logic high signal.
This in turn will drive the LTC4211’s ON pin low. If the ON
pin is held low for more than 8
µs, the LTC4211’s GATE pin
is switched to ground.



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