LTC2951ITS8-1#PBF Linear Technology, LTC2951ITS8-1#PBF Datasheet - Page 12
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LTC2951ITS8-1#PBF
Manufacturer Part Number
LTC2951ITS8-1#PBF
Description
Manufacturer
Linear Technology
Datasheet
1.LTC2951ITS8-1PBF.pdf
(20 pages)
Specifications of LTC2951ITS8-1#PBF
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Pin Count
8
Mounting
Surface Mount
Package Type
TSOT-23
Case Length
2.9mm
Screening Level
Industrial
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LTC2951-1/LTC2951-2
APPLICATIONS INFORMATION
and the external OFFT capacitor (t
of the OFFT timing (t
ing that EN will be switched low after the KILL turn-off
(t
period. Once a system has finished performing its power-
down operations, it can set KILL low (t
diately set EN low, terminating the KILL turn-off timer. The
release of the PB pin is then debounced with an internal
32ms timer.
The system is now in its reset state: where the LTC2951
is in low power mode (6µA). PB is monitored for a high
to low transition.
12
POWER-ON
KILL
TIMING
KILL
,
Figure 2. Aborted Power-On Sequence for LTC2951-1
PB
EN
OFF DELAY
+ t
6
KILL
t
), an interrupt (INT) is set, signify-
DB, ON
,
µP FAILED TO SET
OFF DELAY, ADDITIONAL
KILL HIGH
6
INTERNAL
–t
512ms
TIMER
5
). At the completion
7
) and thus imme-
t
ABORT
POWER
TURNED OFF
) timeout
2951 F02
KILL
Aborted Power-On Sequence
The power-on sequence is aborted when the KILL remains
low after the end of the 512ms blanking time. Figure 2 is
a simplified version of an aborted power-on sequence.
At time t
turning off the DC/DC converter).
µP Turns Off Power During Normal Operation
Once the system has powered on and is operating nor-
mally, the µP can turn off power by setting KILL low, as
shown in Figure 3. At time t
This immediately pulls EN low, thus turning off the DC/
DC converter.
PB
EN
ABORT
Figure 3. µP Turns Off Power (LTC2951-1)
XXX DON’T CARE
, since KILL is still low, EN pulls low (thus
KILL
PB & KILL IGNORED
, KILL is set low by the µP .
KILL LOW
µP SETS
TURNS OFF
t
KILL
DC/DC
295112fb
2951 F03