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LTC2955IDDB-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LTC2955
4
2955fa
For more information www.linear.com/LTC2955
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Timing
t
DB(ON)
PB, ON Turn-On Debounce Time PB Falling or ON Rising → Enable Asserted
l
19 32 45 ms
t
DB(OFF)
PB Interrupt Debounce Time
PB Falling → INT Falling
l
19 32 45 ms
t
TMR
Additional Turn-Off Debounce Time C
TMR
= 2200pF
l
5.8 11.5 17.2 ms
t
INT(MIN)
Minimum INT Pulse Width
INT Falling → TMR Rising
l
19 32 45 ms
t
ON(PD)
ON Interrupt Delay
ON Falling → INT Falling, V
SEL
> 0.8V
l
200 µs
t
PGD(PD)
PGD Propagation Delay
ON Falling → PGD Falling
l
200 µs
t
KILL(PD)
KILL Propagation Delay
KILL Falling → Enable Released
l
60 µs
t
KILL(PW)
KILL Minimum Pulse Width
l
60 µs
t
KILL(ON BLANK)
KILL Turn-On Blanking (Note 4)
KILL Low, Enable Asserted → Enable
Released
l
304 512 720 ms
t
EN(LOCK OUT)
EN/EN Lockout Time (Note 5)
Enable Released → Enable Asserted
l
0.6 1 1.4 s
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 7V unless otherwise noted. (Note 2)
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: Guaranteed by design, not subject to test.
Note 4: The KILL turn-on blanking time is the waiting period immediately
after the enable output is asserted. This blanking time allows sufficient
time for the regulator and the µP to perform power-up tasks. The KILL, PB,
and ON inputs are ignored during this period.
Note 5: The enable lockout time is the waiting period immediately after the
enable output is released. It allows an application to properly power-down
such that the next power-up sequence starts from a consistent powered
down configuration. PB and ON are ignored during this period.
Typical perForMance characTerisTics
Supply Current vs Temperature
Supply Current vs Supply Voltage
Undervoltage Lockout vs
Temperature
V
IN
= 7V, T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
V
UVL
(V)
1.10
1.12
1.14
1.20
1.16
0
50
75
2955 G03
1.18
–25
25
100
125
TEMPERATURE (°C)
–50
I
VIN
(µA)
0.8
1.0
1.1
1.2
1.6
1.3
0
50
75
2955 G01
0.9
1.4
1.5
–25
25
100
125
V
IN
(V)
0
I
VIN
(µA)
0.6
0.8
1.0
1.2
10
20
25
2955 G02
1.4
1.6
5
15
30
4035
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
LTC2955
5
2955fa
For more information www.linear.com/LTC2955
Typical perForMance characTerisTics
TMR Pull-Up Current
vs Temperature
EN Output High Voltage vs
Temperature
EN Output High Voltage vs Supply
Voltage
EN/EN Output Low Voltage vs
Temperature PB Input Current vs PB Voltage
PB Voltage vs External PB
Resistance to Ground
ON/KILL Threshold vs
Temperature
Turn-On Debounce Time
vs Temperature
Additional Turn-Off Debounce
Time vs TMR External Capacitance
V
IN
= 7V, T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
t
DB(ON)
(ms)
30
32
31
36
33
0
50
75
2955 G05
35
34
–25
25
100
125
EXTERNAL PB RESISTANCE TO GROUND (kΩ)
0
0
50
100
150
200
10
20
250
4030
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
TEMPERATURE (°C)
–50
V
ON/KILL
(V)
0.790
0.795
0.810
0.800
0
50
75
2955 G04
0.805
–25
25
100
125
TEMPERATURE (°C)
–50
V
EN(VOH)
(V)
3.6
4.0
4.2
4.4
5.0
4.6
0
50
75
2955 G08
3.8
4.8
–25
25
100
125
TMR EXTERNAL CAPACITANCE (nF)
1
1
t
TMR
(ms)
100
10000
10 100 1000
2955 G06
10
1000
TEMPERATURE (°C)
–50
I
TMR(PU)
(µA)
–2.6
–2.8
–2.9
–3.0
–3.4
–3.1
0
50
75
2955 G07
–2.7
–3.2
–3.3
–25
25
100
125
V
IN
(V)
1
V
EN(VOH)
(V)
0.0
1.0
5.0
2.0
3 5
2955 G09
4.0
3.0
2
4
76
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
PB VOLTAGE (V)
–40
I
PB
(µA)
40
–40
–80
–200
–120
0
2955 G11
0
–160
–20
20
40
TEMPERATURE (°C)
–50
V
EN/EN(VOL)
(mV)
50
200
150
250
300
450
350
0
50
75
2955 G10
100
400
–25
25
100
125
V
IN
= 1.5V
V
IN
= 7V
I = 1mA
LTC2955
6
2955fa
For more information www.linear.com/LTC2955
pin FuncTions
EN: Enable Output (LTC2955-1). EN is an active high output
to control the turn-on/off of the system power. Connect this
pin to the RUN or SHUTDOWN pin of the voltage regulator.
The LTC2955 asserts EN high when the pushbutton is
pressed or when ON goes high. The output high voltage
follows the internal LDO output which provides sufficient
margin for most SHUTDOWN pin thresholds.
EN: Inverted Enable Output (LTC2955-2). EN is an active
low output to control the turn-on/off of the system power.
It may drive a voltage regulator’s active low enable input,
or it may drive the gate of a P-channel MOSFET. In the
turn-off state, the LTC2955 pulls this pin to V
IN
through
an internal 900k resistor. The LTC2955 pulls EN to GND
when the pushbutton is pressed or when ON goes high.
Exposed Pad (DFN only): Exposed pad. Leave open or
connect to device ground.
GND: Device Ground.
INT: Open Drain Interrupt Output. Connect this pin to the
interrupt input of the system with a pull-up resistor to the
system supply. The LTC2955 asserts the INT pin low when
it receives the turn-off command from the pushbutton or
the ON pin. The minimum pulse width of the INT signal is
32ms and can be extended through the TMR pin.
KILL: Kill Input. A low at KILL releases the enable output
(EN/EN). This pin can be driven by the microprocessor or it
can be used as a voltage monitor input. Tie to the system
power supply or an external voltage of 1.2V~5V if unused.
ON: Monitor Input. Connect this pin to an external resistive
divider from the monitored voltage. This allows automatic
system turn-on when the monitored voltage transitions
high. For the DFN part, if the SEL pin is tied high, it also
allows automatic system turn-off when the monitored
voltage transitions low. Tie to GND if unused.
PB: Pushbutton Input. This is an active low input with a
900k pull-up to an internal LDO. Connect one terminal of
the pushbutton to this pin and connect the other terminal of
the pushbutton to GND. The pin may be left open if unused.
PGD (DFN only): ON Status Output. A high on this pin
indicates that the voltage at the ON pin is above the input
threshold of 0.8V. This pin can be used as a system input
to inform the system whether the turn-on was triggered by
the ON pin or the pushbutton pin. Leave open if unused.
SEL (DFN only): Mode Select Input. Connect SEL to GND
to block the ON pin falling edge from activating system
turn-off. Connect SEL to V
IN
to allow both the ON pin rising
and falling edges to activate system turn-on and turn-off
respectively. For the TSOT package, SEL is internally tied
to GND. Do not leave open.
TMR: Timer Pin. A capacitor to ground determines the
additional time (5.2 seconds/μF) beyond the default 64ms
that the pushbutton must be held low before immediately
releasing the EN/EN and INT outputs. The turn-off debounce
time defaults to 64ms if this pin is left open. To disable the
ability to force a system power-down with a pushbutton
press, ground the TMR pin.
V
IN
: Power Supply Input. For > 20V applications, connect
V
IN
to the power source through a 1k resistor and bypass
V
IN
to GND with a 10nF low ESR capacitor.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

LTC2955IDDB-1#TRMPBF

Mfr. #:
Buy LTC2955IDDB-1#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Pushbutton On/Off Controller with Automatic Turn-On
Lifecycle:
New from this manufacturer.
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