Datasheet

LTC4253B
22
4253bf
applicaTions inForMaTion
4253b F07
GATE
START-UP
INITIAL TIMING
V
LKO
V
GATEL
GND – V
EE
OR
(–48RTN) – (–48V)
UV/OV
V
IN
TIMER
GATE
SENSE
V
OUT
1 2 3 4 56 7 89
SS
DRAIN
PWRGD1
A B
PWRGD2
PWRGD3
SQTIMER
EN2
EN3
C D
V
IN
CLEARS V
LKO
, CHECK UV > V
UVHI
, OV < V
OVLO
, RESET < 0.8V, GATE < V
GATEL
, SENSE < V
CB
,
SS < 20 • V
OS
AND TIMER < V
TMRL
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 • V
OS
V
SQTMRH
5µA
5µA
V
SQTMRH
V
IH
V
IH
V
TMRH
V
ACL
V
CB
V
TMRL
20 • (V
ACL
+ V
OS
)
20 • (V
CB
+ V
OS
)
20 • V
OS
5µA
50µA
5µA
5µA
50µA
50µA
V
DRNCL
V
DRNL
V
IN
– V
GATEH
200µA + 8 • I
DRN
Figure 7. System Power-Up Timing (All Waveforms Are Referenced to V
EE
)