LTC2952
5
2952fb
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The greatest of V1, V2 or VS is the internal supply voltage (V
MAX
).
Note 3: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 4: V2
PREF_TH
is the minimum voltage level at which V2 becomes
the preferential source of quiescent current when both of the ideal diodes
are off.
Note 5: VS is stepped from (V1 or V2) + 0.2V to (V1 or V2) – 0.2V to
trigger the event. The gate voltages are initially V
G(OFF)
.
Note 6: VS is stepped from V
X
– 0.2V to V
X
+ 0.2V to trigger the event.
Gate voltages are initially clamped at V
G(ON)
.
Note 7: The adjustable turn-on and turn-off timer period is the adjustable
debounce period following the Internal default-on and default-off timer
period, respectively.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V1 = V2 = VS = 2.7V to 28V unless otherwise noted. (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
μP Handshake Timing
t
INT(MIN)
INT Minimum Pulse Width Minimum Measured Time PB Rising to
INT Rising
l
10 50 250 μs
t
KILL(PW)
KILL Minimum Pulse Width Full Swing Pulse From 5V to 0V
l
150 500 μs
t
KILL,ON BLANK
KILL On Blanking (Note 9) KILL = 0V, Measured Time Between EN Rising
→ EN Falling
l
270 400 530 ms
t
KILL, OFF WAIT
KILL Wait Time (Note 10) KILL = 1V, C
OFFT = OPEN
, Measured Time
Between INT Falling → EN Falling
l
270 400 530 ms
t
EN, LOCKOUT
Enable Lockout Time (Note 11)
Measured Time Between EN Falling → EN
Rising
l
270 400 530 ms
Note 8: The input current to the three-state WDE pin are the pull-up
and the pull-down current when the pin is either set to 3.3V or GND,
respectively. In the open state, the maximum pull-up or pull-down leakage
current permissible is 10μA.
Note 9: The turn-on KILL blanking time is the waiting period immediately
following the EN pin switching high; at the end of this period the input
to the KILL needs to be high to indicate that the system has powered up
properly, otherwise the EN pin is immediately switched low.
Note 10: The KILL wait time during the power-down process is the wait
period immediately following a valid turn-off command until the EN pin
switches low.
Note 11: The enable lockout time is the minimum wait time between the
last falling edge and the next rising edge on the EN pin.
