LTC4241
1
sn4241 4241f
FEATURES
APPLICATIO S
DESCRIPTIO
TYPICAL APPLICATIO
s
Allows Safe Board Insertion and Removal from a
Live PCI Slot
s
Controls 3.3V, 5V, 12V, 12V and 3.3V Auxiliary
Supplies
s
Independent 3.3V Auxiliary Supply Hot Swap
TM
Controller
s
Adjustable Foldback Current Limit with Circuit
Breaker
s
Adjustable Supply Voltage Power-Up Rate
s
High Side Drive for External N-Channel FETs
s
12V and 12V On-Chip Switches
s
Fault and Power Good Outputs
PCI-Bus with 3.3V Auxiliary
Hot Swap Controller
The LTC
?/DIV>
4241 is a Hot Swap controller that allows a board
to be safely inserted and removed from a live PCI-bus slot.
It has a primary controller that controls the four PCI
supplies and an independent auxiliary controller to control
the 3.3V auxiliary supply. External N-channel transistors
are used to control the 3.3V, 5V and 3.3V auxiliary supplies
while on-chip switches control the 12V and 12V supplies.
The 3.3V, 5V and 3.3V auxiliary supplies can be ramped up
at an adjustable rate. Electronic circuit breakers protect all
five supplies against overcurrent faults. The foldback
current limit feature reduces current spikes and power
dissipation when shorts occur. The PWRGD output of the
primary controller indicates when all four PCI supplies are
within tolerance. The FAULT output indicates an overcurrent
condition for any of the five supplies.
The LTC4241 is available in the 20-pin narrow SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
s
PCI-Based Servers
s
Computer Systems
AUXIN AUXSENSE AUXGATE 3V
IN
3V
SENSE
GATE 3V
OUT
5V
IN
5V
SENSE
5V
OUT
GND
12V
IN
V
EEIN
AUXON
ON
FAULT
PWRGD
C3
10nF
R6
10&
C1
0.047礔
C2
0.1礔
R5
10&
R3
0.07&
R2
0.005&
R4
10&
R7
100&
R1
0.007&
LOGIC
RESET
R8 10k
R9 10k
LTC4241
8
1
2
12
5
6
7
20
19
4
11
10
9
13
14
15
3
17
16
18
PCI
POWER
SYSTEM
CONTROLLER
SYSTEM
POWER
SUPPLY
BACKPLANE
CONNECTOR
GND
5V
5A
3.3V
7.6A
3.3V
AUX
500mA
12V
500mA
12V
100mA
Q1
IRF7413
Q2
IRF7413
Q3
Si2306DS
4241 F01
12V
OUT
V
EEOUT
TIMER
RESET
Figure 1. Hot Swappable PCI and 3.3V Auxiliary Supplies
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