1
LTC4212
4212f
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO
s
Allows Safe Board Insertion and Removal
from a Live Backplane
s
Controls Supply Voltages from 2.5V to 16.5V
s
Adjustable Soft-Start with Inrush Current
Limiting
s
Fast Turn-Off Time
s
No External Gate Capacitor is Required
s
Power Good Input with Adjustable Timer and
Glitch Filter
s
Power-Up Timeout Circuit Interfaces with External
Supply Monitors
s
Dual Level Overcurrent Fault Protection
s
Automatic Retry or Latched Mode Operation
s
High Side Drive for an External N-Channel FET
s
MS10 Package
The LTC
?/DIV>
4212 is a Hot Swap
TM
controller that allows a
board to be safely inserted and removed from a live
backplane. An internal high side switch driver controls the
gate of an external N-channel MOSFET for supply voltages
ranging from 2.5V to 16.5V. The LTC4212 provides soft-
start and inrush current limiting during the start-up
period. It features a power-up timeout circuit that discon-
nects the system supply when the onboard supplies do not
enter into regulation within an adjustable timeout period.
The controller interfaces with external supply monitor ICs
or directly with the PGOOD pin of a DC/DC converter. After
normal power-up, a programmable power good glitch
filter can be enabled to filter out short term dips in the
supplies.
Two current limit comparators provide dual level
overcurrent circuit breaker protection. The slow com-
parator trips at V
CC
50mV and activates in 18祍. The fast
comparator trips at V
CC
150mV and typically responds
in 500ns.
The LTC4212 can be configured for both latchoff and
autoretry applications and is available in a 10-pin MSOP
package.
s
Electronic Circuit Breaker
s
Hot Board Insertion and Removal
s
Self-Isolating Hot Swap Boards
Hot Swap Controller with
Power-Up Timeout
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
+
V
CC
SENSE
LTC4212
10礔
+
10礔
5V
2.5V
1.5A
3.3V
1.5A
4212 TA01a
GATE
PGT
PGF
TIMER
0.01礔
PGI
ON
V
CC
5V
GND
Z1 = SMAJ10A (TVS)
20k
10k
10&
0.007&
EDGE
CONNECTOR
(MALE)
Si4410DY
Z1
10k
10k
2.1k
10k
FAULT
GND
FAULT
+
10礔
LT1963-2.5
4.7nF
270pF
100nF
BACKPLANE
CONNECTOR
(FEMALE)
+
10礔
+
10礔
LT1963-3.3
LTC1727-2.5
GND
V
CCA
V
CC3
COMP2.5 V
CC25
COMP3
COMP A
Power-Up Waveforms
ON
5V/DIV
TIMER
1V/DIV
PGT
1V/DIV
PGI
5V/DIV
Hot Swap Controller with Power Good Function
5ms/DIV
发布紧急采购，3分钟左右您将得到回复。
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