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LTC2954CTS8-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
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
LTC2954
5
2954fb
PB Power-Down Debounce Time
(t
PD,MIN
+ t
PDT
) vs PDT External
Capacitance
PDT Pull-Up Current
vs Temperature
PB Current vs PB Voltage
PB Voltage vs External PB
Resistance to Ground
EN/EN V
OL
vs Current Load
EN (LTC2954-2) Voltage vs V
IN
EN (LTC2954-1) Voltage vs V
IN
Internal Default PB Power-Down
Debounce Time (t
PD,MIN
) vs V
IN
TYPICAL PERFORMANCE CHARACTERISTICS
2954 G07
V
IN
(V)
0
5
10 15 20 25 30
t
PD, MIN
(ms)
70
60
40
50
30
20
10
0
T
A
= 25°C
2954 G08
1
t
PD, MIN
+ t
PDT
(ms)
100
1000
1000
10
10
100
10000
T
A
= 25°C
V
IN
= 3.3V
PDT EXTERNAL CAPACITANCE (nF)
2954 G09
TEMPERATURE (°C)
–50
–25
0 25 50 75 100
PDT PULL-UP CURRENT (μA)
–3.4
–3.2
–3.0
–2.8
–2.6
V
IN
= 26.4V
V
IN
= 2.7V
2954 G10
PB CURRENT (μA)
–10010
20
30–5 5
15
25
–250
–200
–150
–100
–50
0
PB VOLTAGE (V)
T
A
= 25°C
V
IN
= 3.3V
2954 G11
0
0
50
100
150
200
250
300
5101520
V
IN
= 3.3V
T
A
= 25°C
PB VOLTAGE (mV)
EXTERNAL PB RESISTANCE TO GROUND (kΩ)
T
A
= –45°C
T
A
= 100°C
2954 G13
V
IN
(V)
0
EN (V)
4
1
2
3
T
A
= 25°C
100k PULL-UP FROM EN TO V
IN
1.0
0.8
0.6
0.4
0.2
0
2954 G14
EN (V)
V
IN
(V)
04
1
2
3
4
3
2
1
0
T
A
= 25°C
100k PULL-UP FROM EN TO V
IN
2954 G12
EN/EN CURRENT LOAD (mA)
0.0
EN/EN VOLTAGE (mV)
600
500
400
300
200
100
0
2.0
0.5
1.0
1.5
2.5
T
A
= 25°C
V
IN
= 3.3V
LTC2954
6
2954fb
V
IN
(Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V.
PB (Pin 2/Pin 3): Pushbutton Input. Connecting PB to
ground through a momentary switch provides on/off
control via the EN/EN and INT outputs. An internal 100k
pull-up resistor connects to an internal 1.9V bias voltage.
The rugged PB input withstands ±10kV ESD HBM and
can be pulled up to 26.4V externally without consuming
extra current.
ONT (Pin 3/Pin 2): Turn-On Time Input. Placing an external
capacitor to ground determines the additional time (6.4
seconds/μF) the PB pin must be held low before the enable
output is asserted. Floating this pin results in a default
turn on debounce time of 32ms.
GND (Pin 4/Pin 1): Device Ground.
INT (Pin 5/Pin 8): Open Drain Interrupt Output. After a
pushbutton turn-off event is detected (t
DB,OFF
), the LTC2954
interrupts the system (μP) by asserting the INT pin low.
The μP would perform power-down and housekeeping
tasks and then assert the KILL pin low, thus releasing the
enable output. The INT pulse width is a minimum of 32ms
and stays low as long as PB is asserted. If PB is asserted
for longer than t
PD,MIN
+ t
PDT
, the INT and EN/EN outputs
are immediately released.
EN (LTC2954-1, Pin 6/Pin 7): Open Drain Enable Output.
This pin is intended to enable system power. EN is asserted
high after a valid PB turn-on event (t
DB,ON
+ t
ONT
). EN is
released low if: a) KILL is not driven high (by μP) within
512ms of the initial valid PB power turn-on event, b) KILL
is driven low during normal operation, c) PB is pressed
and held low (t
PD,MIN
+ t
PDT
) during normal operation. This
pin can connect directly to a DC/DC converter shutdown
pin that provides an internal pull-up. Otherwise a pull-up
resistor to an external supply is required. The operating
range for this low leakage pin is 0V to 26.4V.
EN (LTC2954-2, Pin 6/Pin 7): Open Drain Enable Bar
Output. This pin is intended to enable system power. EN is
asserted low after a valid PB turn-on event (t
DB,ON
+ t
ONT
).
EN releases high if: a) KILL is not driven high (by μP) within
512ms of the initial valid PB power turn-on event, b) KILL
is driven low during normal operation, c) PB is pressed
and held low (t
PD,MIN
+ t
PDT
) during normal operation. This
pin can connect directly to a DC/DC converter shutdown
pin that provides an internal pull-up. Otherwise a pull-up
resistor to an external supply is required. The operating
range of this pin is 0V to 26.4V.
PDT (Pin 7/Pin 6): Power-Down Time Input. A capacitor
to ground determines the additional time (6.4 seconds/μF)
that the pushbutton must be held low before immediately
releasing the EN/EN and INT outputs. Floating this pin
results in a pushbutton power-down time of 64ms.
KILL (Pin 8/Pin 5): Kill Input. Forcing KILL low releases the
enable output. During system turn-on, this pin is blanked by
a 512ms internal timer (t
KILL,ON BLANK
) to allow the system
to pull KILL high. This pin has an accurate 0.6V threshold
and can be used as a voltage monitor input. If unused,
connect to a low voltage output supply (see Figure 6).
Exposed Pad (Pin 9 DFN Only): Exposed Pad may be left
open or connected to device ground.
(TSOT-23/DFN)
PIN FUNCTIONS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC2954CTS8-1#TRMPBF

Mfr. #:
Buy LTC2954CTS8-1#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Push Button On/Off Controller with U Interrupt for Menu Driven Applications
Lifecycle:
New from this manufacturer.
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