LTC4252-2 Linear Technology, LTC4252-2 Datasheet - Page 25

• Manufacturer Part Number: LTC4252-2
• Description: Negative Voltage Hot Swap Controllers
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
PWRGD
SENSE
UV/OV
TIMER
DRAIN
GATE
SS
Figure 12. Undervoltage Timing with an Overvoltage Glitch (All Waveforms are Referenced to V
V
UV/OV CLEARS V
OVHI
1
U
V
UVHI
UV/OV OVERSHOOTS V
2
TIMER
SENSE
GATE
OV
UV/OV DROPS BELOW V
SS
U
3
V
V
Figure 13. Overvoltage Timing (All Waveforms are Referenced to V
UVHI
GATEL
OVLO
OV OVERSHOOTS V
1
, CHECK OV CONDITION, GATE < V
V
V
OVHI
GATEL
W
OVHI
V
5.8µA
V
INITIAL TIMING
TMRH
OVLO
230µA + 8 • I
AND TIMER ABORTS INITIAL TIMING CYCLE
58µA
OVLO
OV DROPS BELOW V
2 34
OVHI
AND TIMER RESTARTS INITIAL TIMING CYCLE
20 • (V
START-UP
20 • (V
. GATE AND SS ARE PULLED DOWN, PWRGD AND TIMER ARE UNAFFECTED
20 • V
U
GATE
DRN
5
58µA
V
ACL
TMRH
OS
CB
20 • V
67 8 9
20 • (V
V
+ V
+ V
TMRL
GATEL
OS
OS
OS
OVLO
CB
)
)
V
V
V
IN
ACL
CB
58µA
, SENSE < V
20 • (V
4 5 67
+ V
, CHECK GATE < V
TIMER CLEARS V
– V
5.8µA
230µA + 8 • I
OS
GATEH
)
ACL
START-UP
GATE
+ V
8
CB
58µA
OS
, SS < 20 • V
LTC4252A-1/LTC4252A-2
9
10
DRN
)
TMRL
11
GATEL
12
, CHECK GATE < V
V
V
V
V
V
, SENSE < V
LTC4252-1/LTC4252-2
IN
ACL
CB
DRNCL
DRNL
OS
– V
AND TIMER < V
5.8µA
GATEH
5.8µA
4252-1/2 F13
CB
AND SS < 20 • V
GATEL
TMRL
EE
, SENSE < V
)
OS
5.8µA
CB
4252-1/2 F12
AND SS < 20 • V
EE
)
OS
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