Datasheet

LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
25
425212fe
For more information www.linear.com/LTC4252-1
applicaTions inForMaTion
UV/OV
TIMER
GATE
SENSE
SS
DRAIN
PWRGD
5.8µA
58µA
58µA
5.8µA
5.8µA
UV/OV CLEARS V
UVHI
, CHECK OV CONDITION, GATE < V
GATEL
, SENSE < V
CB
, SS < 20 • V
OS
AND TIMER < V
TMRL
1 2 3 4 5 67 8 9
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 • V
OS
10
11
12
425212 F12
UV/OV DROPS BELOW V
OVLO
AND TIMER RESTARTS INITIAL TIMING CYCLE
UV/OV OVERSHOOTS V
OVHI
AND TIMER ABORTS INITIAL TIMING CYCLE
V
ACL
V
CB
230µA + 8 • I
DRN
20 • V
OS
V
IN
– V
GATEH
V
DRNL
V
DRNCL
20 • (V
CB
+ V
OS
)
20 • (V
ACL
+ V
OS
)
V
GATEL
V
TMRL
V
TMRH
V
OVHI
V
UVHI
V
OVLO
GATE
START-UP
INITIAL TIMING
OV
TIMER
GATE
SENSE
SS
5.8µA
58µA
58µA
5.8µA
1 2 34 5 67 8 9
425212 F13
OV DROPS BELOW V
OVLO
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 • V
OS
OV OVERSHOOTS V
OVHI
. GATE AND SS ARE PULLED DOWN, PWRGD AND TIMER ARE UNAFFECTED
V
ACL
V
CB
230µA + 8 • I
DRN
20 • V
OS
V
IN
– V
GATEH
20 • (V
CB
+ V
OS
)
20 • (V
ACL
+ V
OS
)
V
GATEL
V
OVHI
V
TMRH
V
OVLO
GATE
START-UP
Figure 13. Overvoltage Timing (All Waveforms Are Referenced to V
EE
)
Figure 12. Undervoltage Timing with an Overvoltage Glitch (All Waveforms Are Referenced to V
EE
)