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LTC1421 데이터시트(PDF) 16 Page - Linear Technology

부품명 LTC1421
상세설명  Hot Swap Controller
PDF  24 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1421 데이터시트(HTML) 16 Page - Linear Technology

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LTC1421/LTC1421-2.5
APPLICATIONS INFORMATION
VCCLO
12
3
4
VCCHI
DISABLE
CON1
CON2
CPON
PWRGD
VTH2
1421 F17
VOUTHI
GATEHI
GATELO
VOUTLO
RESET
FAULT
POR
32
µs
Figure 17. Board Removal Timing
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. VOUTLO and VOUTHI are
actively pulled down. When VOUTLO falls below its reset
threshold (time point 2) PWRGD is pulled low. To allow
time for power fail information to be stored in nonvolatile
memory, the falling edge of RESET (time point 3) is
delayed by 32
µs from the falling edged of PWRGD.
Finally, the input supply pins VCCHI and VCCLO break
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.



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