LTC4253 LINER [Linear Technology], LTC4253 Datasheet - Page 26

• Manufacturer Part Number: LTC4253
• Manufacturer: LINER [Linear Technology]

LTC4253/LTC4253A
APPLICATIONS INFORMATION
26
SQTIMER
PWRGD1
PWRGD2
PWRGD3
SENSE
TIMER
DRAIN
GATE
EN2
EN3
UV
SS
UV DROPS BELOW V
1
V
V
UVLO
GATEL
UV CLEARS V
2
V
UVHI
UVLO
Figure 10. Undervoltage Timing (All Waveforms Are Referenced to V
(V
UVHI
UV
5μA
INITIAL TIMING
– V
(V
UV
UVHST
FOR THE LTC4253A), CHECK OV CONDITION, RESET < 0.8V, GATE < V
50μA
FOR THE LTC4253A). GATE, SS AND TIMER ARE PULLED DOWN, PWRGD RELEASES
V
ACL
TMRH
CB
V
+ V
+ V
TMRL
OS
OS
OS
)
)
50μA
3 4 56
TIMER CLEARS V
START-UP
GATE
7
50μA
8 9 A B
DRN
TMRL
V
SQTMRH
5μA
, CHECK GATE < V
V
V
V
V
V
V
SQTMRL
IN
ACL
CB
DRNCL
DRNL
– V
5μA
GATEH
C
5μA
GATEL
GATEL
D
, SENSE < V
V
, SENSE < V
SQTMRH
V
SQTMRL
EE
5μA
)
CB
CB
4253 F10
OS
AND TIMER < V
OS
425353afe
TMRL