LTC4253 LINER [Linear Technology], LTC4253 Datasheet - Page 24

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

LTC4253/LTC4253A
APPLICATIONS INFORMATION
Live Insertion with Short Pin Control of UV/OV
In the example shown in Figure 9, power is delivered
through long connector pins whereas the UV/OV divider
makes contact through a short pin. This ensures the power
24
(–48RTN) – (–48V)
GND – V
SQTIMER
PWRGD1
PWRGD2
PWRGD3
SENSE
UV/OV
TIMER
DRAIN
EE
GATE
V
EN2
EN3
OUT
V
OR
SS
IN
Figure 9. Power-Up Timing with a Short Pin (All Waveforms Are Referenced to VEE)
1
V
V
GATEL
UVHI
V
LKO
UV CLEARS V
SENSE < V
2
CB
UVHI
INITIAL TIMING
(V
5μA
UV
50μA
FOR THE LTC4253A), CHECK OV < V
OS
AND TIMER < V
ACL
V
CB
TMRH
+ V
+ V
V
TMRL
OS
OS
OS
)
)
TMRL
50μA
3 4 5 6
TIMER CLEARS V
connections are firmly established before the LTC4253/
LTC4253A are activated. At time point 1, the power pins
make contact and V
the UV/OV divider makes contact and its voltage exceeds
START-UP
GATE
7
50μA
OVHI
89
V
5μA
DRN
SQTMRH
A B
(V
TMRL
OV
V
V
V
V
V
V
, CHECK GATE < V
IN
ACL
CB
DRNCL
DRNL
FOR THE LTC4253A), RESET < 0.8V, GATE < V
SQTMRL
– V
C
GATEH
5μA
IN
5μA
ramps through V
D
V
V
GATEL
SQTMRH
SQTMRL
, SENSE < V
5μA
4253 F09
CB
LKO
. At time point 2,
GATEL
,
OS
425353afe