1
LTC4221
4221fa
Dual Hot Swap Controller/
Power Sequencer with Dual Speed,
Dual Level Fault Protection
?/DIV>
Allows Safe Board Insertion and Removal from a
Live Backplane
?/DIV>
Configurable Power Supply Sequencing
?/DIV>
Soft-Start with Current Foldback Limits Inrush
Current
?/DIV>
No External Gate Capacitor Required
?/DIV>
Adjustable Dual Level Circuit Breaker Protection
?/DIV>
Controls Supply Voltages from 1V to 13.5V
?/DIV>
Independent N-Channel MOSFET High Side Drivers
?/DIV>
FB Pin Monitors V
OUT
for Overvoltage Protection
?/DIV>
Latch Off or Automatic Retry on Current Fault
?/DIV>
FAULT and PWRGD Outputs
?/DIV>
Narrow 16-Pin SSOP Package
?/DIV>
Electronic Circuit Breaker
?/DIV>
Power Supply Sequencing
?/DIV>
Live Board Insertion and Removal
?/DIV>
Industrial High Side Switch/Circuit Breaker
The LTC
?/DIV>
4221 is a 2-channel Hot Swap
TM
controller that
allows a board to be safely inserted and removed from a
live backplane. Using two independent high side gate
drivers to control two external N-channel pass transistors,
the output voltages can be ramped up with current foldback
to limit the inrush current during the start-up period. No
external compensation capacitors are required at the
GATE pins. The two channels can be configured to ramp up
and down separately or simultaneously for supply volt-
ages ranging from 2.7V to 13.5V and 1V to 13.5V for
channels 1 and 2 respectively.
Each channel has two current limit comparators that
provide dual level and dual speed overcurrent circuit
breaker protection after the start-up period. If any current
sense voltage exceeds 100mV for 1約 or 25mV for the
timeout delay (set by the C
FILTER
at the FILTER pin), then
the FAULT latch is set and both GATE pins are pulled low.
The FB pins monitor the respective channel output volt-
ages and provide the inputs for the PWRGD comparators
as well as overvoltage protection.
Hot Swap is a trademark of Linear Technology Corporation.
2-Channel Hot Swap Controller
FEATURES
DESCRIPTIO
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
ON2
FAULT
GND
LTC4221
FB2
PWRGD2
PWRGD1
PWRGD2
V
OUT1
3.3V/5A
V
OUT2
2.5V/5A
PWRGD1
FB1
LONG
LONG
SHORT
GND
FAULT
LONG
*SMAJ10 (OPTIONAL)
SHORT
TIMER
FILTER
ON1
V
CC1
SENSE1 GATE1 V
CC2
SENSE2 GATE2
SHORT
V
CC1
3.3V
V
CC2
2.5V
BACKPLANE
CONNECTOR
(FEMALE)
PCB EDGE
CONNECTOR
(MALE)
10?/DIV>
21k
13.3k
10k
10k
10?/DIV>
14.3k
IRF7413
5.11k
10k
10k
20k
5.11k
4221 TA01
100nF
*
*
1nF
470nF
100nF
IRF7413
0.004?/DIV>
0.004?/DIV>
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