LTC1421 LINER [Linear Technology], LTC1421 Datasheet - Page 16

• Manufacturer Part Number: LTC1421
• Description: Hot Swap Controller
• Manufacturer: LINER [Linear Technology]

APPLICATIONS
LTC1421/LTC1421-2.5
Board Removal Timing
When the board is removed from the host, the sequence
happens in reverse (Figure 17). Since CON1 and CON2 are
the shortest pins, they break connection first and are
internally pulled high (time point 1). The charge pumps are
turned off, CPON is pulled low. V
actively pulled down. When V
threshold (time point 2) PWRGD is pulled low. To allow
16
DISABLE
GATELO
PWRGD
U
GATEHI
V
V
RESET
FAULT
V
OUTLO
CPON
V
CON1
CON2
OUTHI
CCLO
CCHI
POR
INFORMATION
U
OUTLO
1
OUTLO
W
falls below its reset
V
TH2
and V
2
Figure 17. Board Removal Timing
32 s
U
OUTHI
3
are
4
time for power fail information to be stored in nonvolatile
memory, the falling edge of RESET (time point 3) is
delayed by 32 s from the falling edged of PWRGD.
Finally, the input supply pins V
contact (time point 4). If staggered pins are not used, the
board may be powered down prior to removal by switch-
ing the POR pin to ground with a toggle switch.
CCHI
1421 F17
and V
CCLO
break