Datasheet
LTC2954
4
2954fb
Supply Current vs Temperature
Turn-On Debounce Time (t
DB, ON
+
t
ONT
) vs ONT External Capacitance
Supply Current vs Supply Voltage
ONT Pull-Up Current
vs Temperature
Turn-Off Debounce Time (t
DB, OFF
)
vs V
IN
Internal Default Turn-On
Debounce Time (t
DB, ON
) vs V
IN
TYPICAL PERFORMANCE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
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
DB,ON
or t
ONT
.
Note 4: To manually force an immediate release of the EN/EN pin, the
pushbutton input must be held low for at least t
PD,MIN
(internal default
power-down timer) + t
PDT
(adjustable by placing external capacitor at
PDT pin).
Note 5: The enable lockout 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 lockout
time. This time delay does not include t
DB,ON
or t
ONT
.
2954 G01
TEMPERATURE (°C)
–50
I
VIN
(μA)
10
8
6
4
2
0
–25
02550
75 100
V
IN
= 26.4V
V
IN
= 3.3V
V
IN
= 2.7V
2954 G02
0
5
10 15 20 25 30 35
V
IN
(V)
I
VIN
(μA)
15
12
9
6
3
0
T = 85°C
T = –40°C
T = 25°C
2954 G03
V
IN
(V)
0
0
t
DB, ON
(ms)
10
20
30
40
50
5
10 15 20
25 30
T
A
= 25°C
2954 G04
1
t
DB, ON
+ t
ONT
(ms)
100
1000
1000
10
10
100
10000
T
A
= 25°C
V
IN
= 3.3V
ONT EXTERNAL CAPACITANCE (nF)
2954 G05
TEMPERATURE (°C)
–50
–25
0 25 50 75 100
ONT PULL-UP CURRENT (μA)
–3.4
–3.2
–3.0
–2.8
–2.6
V
IN
= 26.4V
V
IN
= 2.7V
2954 G06
V
IN
(V)
0
t
DB, OFF
(ms)
5 1015202530
50
40
30
20
10
0
T
A
= 25°C