LTC2954
The
●
denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T = 25°C. V = 2.7V to 26.4V, unless otherwise noted. (Note 2)
A
IN
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
●
●
●
I
PB
PB Input Current
2.5V < V < 26.4V
±1
–12
–15
µA
µA
µA
PB
V
V
= 1V
= 0.6V
–1
–3
–6
–9
PB
PB
●
V
V
PB Input Threshold
PB Falling
I = –1µA
PB
0.6
1
0.8
1.6
1
2
V
V
PB(VTH)
PB(VOC)
PB Open Circuit Voltage
EN/EN Lock Out Time (Note 5)
EN/EN Leakage Current
●
t
I
Enable Released → Enable Asserted
200
256
325
ms
EN, Lock Out
EN(LKG)
●
●
V
V
= 1V, Sink Current Off
= 26.4V, Sink Current Off
±0.1
±1
µA
µA
EN/EN
EN/EN
●
V
EN/EN Voltage Output Low
I
= 500µA
0.11
0.4
V
EN(VOL)
EN/EN
Power On Timing Pin (ONT)
●
●
●
●
I
I
t
t
ONT Pull Up Current
V
V
= 0V
–2.4
2.4
26
–3
3
–3.6
3.6
µA
µA
ONT(PU)
ONT(PD)
DB, ON
ONT
ONT
ONT
ONT Pull Down Current
= 1.3V
Internal Turn On Debounce Time
Additional Adjustable Turn On Time
ONT Pin Float, PB Falling → Enable Asserted
32
41
ms
ms
C
= 1500pF
9
11.5
13.5
ONT
Power Down Timing Pin (PDT)
●
●
●
●
I
I
t
t
PDT Pull Up Current
V
V
= 0V
–2.4
2.4
26
–3
3
–3.6
3.6
41
µA
µA
PDT(PU)
PDT(PD)
DB, OFF
PD, Min
PDT
PDT
PDT Pull Down Current
= 1.3V
Turn Off Interrupt Debounce Time PB Falling → INT Falling
Internal Power Down
32
64
ms
ms
PB
PDT Pin Float, PB Falling → Enable Released
52
82
DebounceTime (Note 4)
●
t
Additional Adjustable PB Power
Down Debounce Time
C
PDT
= 1500pF
9
11.5
13.5
ms
PDT
●
●
t
t
Minimum INT Pulse Width
Maximum INT Pulse Width
INT Asserted → INT Released
26
35
32
41
ms
ms
INT, Min
INT, Max
C
PDT
= 1500pF, INT Asserted → INT Released
43.5
54.5
µP Handshake Pins (INT, KILL)
●
●
●
●
●
●
●
●
I
INT Leakage Current
V
= 3V
±1
0.4
µA
V
INT(LKG)
INT
V
V
V
INT Output Voltage Low
KILL Input Threshold Voltage
KILL Input Threshold Hysteresis
KILL Leakage Current
I
= 3mA
INT
0.11
0.6
30
INT(VOL)
KILL(TH)
KILL Falling
0.57
10
0.63
50
V
mV
µA
µs
µs
ms
KILL(HYST)
KILL(LKG)
KILL(PW)
I
t
t
t
V
= 0.6V
±0.1
KILL
KILL Minimum Pulse Width
KILL Propagation Delay
30
KILL Falling → Enable Released
30
KILL(PD)
KILL Turn On Blanking (Note 3)
KILL = Low, Enable Asserted → Enable Released
400
512
650
KILL, On Blank
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: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3: The KILL turn on blanking timer period is the waiting period
immediately after the enable output is asserted. This blanking time allows
sufficient time for the DC/DC converter and the µP to perform power up
tasks. The KILL and PB inputs are ignored during this period. If KILL remains
low at the end of this time period, the enable output is released, thus turning
off system power. This time delay does not include t or t
.
ONT
DB, ON
Note 4: To manually force an immediate release of the EN/EN pin, the push
button input must be held low for at least t (internal default power
PD,Min
down timer) + t
(adjustable by placing external capacitor at PDT pin).
PDT
Note 5: The enable lock out time is designed to allow an application to
properly power down such that the next power up sequence starts from a
consistent powered down configuration. PB is ignored during this lock out
time. This time delay does not include t
or t
.
DB, ON
ONT
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