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LTABK Datasheet

  • LTABK

  • Negative Low Voltage Hot Swap Controllers

  • 32頁

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LTC4214-1/LTC4214-2
Negative Low Voltage
Hot Swap Controllers
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Allows Safe Board Insertion and Removal from a
Live Backplane
Controls Supplies from 0V to 鈥?6V
Adjustable Analog Current Limit With Circuit
Breaker Timer
Fast Response Time Limits Peak Fault Current
Adjustable Soft-Start Current Limit
Adjustable Timer with Drain Voltage Accelerated
Response
Adjustable Undervoltage/Overvoltage Protection
LTC4214-1: Latch Off After Fault
LTC4214-2: Automatic Retry After Fault
Available in the 10-Pin MSOP Package
The LTC
廬
4214 negative voltage Hot Swap
TM
controller
allows a board to be safely inserted and removed from a
live backplane. Output current is controlled by three stages
of current limiting: a timed circuit breaker, active current
limiting and a fast feedforward path that limits peak
current under worst-case catastrophic fault conditions.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4214 controls negative
supplies ranging from near zero to 鈥?6V. A multifunction
timer delays initial start-up and controls the circuit breaker鈥檚
response time. This response time is accelerated by
sensing excessive MOSFET drain voltage, keeping the
MOSFET within its safe operating area (SOA). An adjust-
able soft-start circuit controls MOSFET inrush current at
start-up. A power good status output can enable a power
module at start-up or disable it if the circuit breaker trips.
The LTC4214-1 latches off after a circuit breaker fault times
out. The LTC4214-2 provides automatic retry after a fault.
The LTC4214 is available in the 10-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
Hot Board Insertion
Electronic Circuit Breaker
Negative Power Supply Control
Central Office Switching
High Availability Servers
Disk Arrays
Optical Networking/Switching
ECL
TYPICAL APPLICATIO
3.3V
鈥?5.2V/5A ECL Supply Hot Swap Controller
EN
2k
GND
10鈩?/div>
SMAJ7A
100nF
GND
(SHORT PIN)
34k
1%
32.4k
1%
5.6nF
1nF
PUSH
RESET
1
V
IN
LTC4214-1
2
PWRGD
9, 8
7
UV/OV DRAIN
10
6
TIMER
GATE
3
4
SS
SENSE
V
EE
3.3nF
5
10nF
4214 TA01
BSS138
GND
470鈩?/div>
C
LOAD
100碌F
+
鈥?.2V
ECL
0.1碌F
75k
IRF7413
22鈩?/div>
SENSE
20mV/DIV
V
OUT
5V/DIV
10鈩?/div>
0.01鈩?/div>
鈥?.2V
U
Start-Up Behavior
GATE
5V/DIV
PWRGD
5V/DIV
4214 TA02
U
U
421412f
1

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    Negative Low Voltage Hot Swap Controllers
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    Negative Low Voltage Hot Swap Controllers
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    Negative Low Voltage Hot Swap Controllers
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