ltc4261cgn-trpbf Linear Technology Corporation, ltc4261cgn-trpbf Datasheet - Page 15

• Manufacturer Part Number: ltc4261cgn-trpbf
• Description: Negative Voltage Hot Swap Controllers With Adc And I2c Monitoring
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
6. The voltage at INTV
7. V
8. The PGI pin is high when the PGI check timer expires
For conditions 1, 2, 5, 6, after the condition is cleared,
the LTC4261/LTC4261-2 will automatically enter the FET
turn-on sequence as previously described.
For any of the fault conditions 3, 4, 7, 8, the FET off
mode is programmable by the corresponding auto-retry
bit in the CONTROL register. If the auto-retry bit is set
undervoltage lockout).
530µs (overcurrent fault).
(power bad fault).
SENSE
INTERNAL
RTN_V
PWRGD
SENSE
GATE
V
PGIO
TMR
OUT
PGI
PG
SS
EE
> 50mV and the condition lasts longer than
START-UP DELAY
UVH
1x
CC
is lower than 4.25V (INTV
Figure 3. LTC4261 Turn-On Sequence
INRUSH
CC
1.77V
50mV
to 0, the FET is latched off upon the fault condition. If
the auto-retry bit is set to 1, after the fault condition is
cleared, a delay timer is started. After the timer expires,
the FET enters the auto-retry mode and GATE is pulled
up. The auto-retry delay following the undervoltage fault
or the power bad fault has a duration of t
retry delay following the overcurrent fault has a duration
of 4t
overvoltage fault does not have a delay. The auto-retry
control bits and their defaults at power up are listed in
Table 6. Note that the LTC4261 defaults to latch-off while
the LTC4261-2 defaults to auto-retry following the over-
current fault.
LATCHED
V
D
Z
for extra cooling time. The auto-retry following the
– 1.2V
2x
PWRGD1
DELAY
PWRGD1
READY
LOAD 1
LTC4261/LTC4261-2
2x
PWRGD2
DELAY
PWRGD2
READY
LOAD 1 + LOAD 2
PGI CHECK
DELAY
NORMAL PGI
4x
POWER BAD
D
. The auto-
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