LTC2954 Linear Technology, LTC2954 Datasheet - Page 3

• Manufacturer Part Number: LTC2954
• Description: Push Button On/Off Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
SYMBOL
I
V
V
t
I
V
Power On Timing Pin (ONT)
I
I
t
t
Power Down Timing Pin (PDT)
I
I
t
t
t
t
t
µP Handshake Pins (  I  N  T ,  K  I  L  L )
I
V
V
V
I
t
t
t
temperature range, otherwise specifications are at T
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  K  I  L  L 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  K  I  L  L and  P  B inputs are ignored during this period. If  K  I  L  L remains
 P  B
EN, Lock Out
EN(LKG)
ONT(PU)
ONT(PD)
DB, ON
ONT
PDT(PU)
PDT(PD)
DB, OFF
PD, Min
PDT
   I  N  T , Min
   I  N  T , Max
 I  N  T (LKG)
 K  I  L  L (LKG)
 K  I  L  L (PW)
 K  I  L  L (PD)
 K  I  L  L , On Blank
 P  B (VTH)
 P  B (VOC)
EN(VOL)
 I  N  T (VOL)
 K  I  L  L (TH)
 K  I  L  L (HYST)
PARAMETER
 P  B Input Current
 P  B Input Threshold
 P  B Open Circuit Voltage
EN/  E  N Lock Out Time (Note 5)
EN/  E  N Leakage Current
EN/  E  N Voltage Output Low
ONT Pull Up Current
ONT Pull Down Current
Internal Turn On Debounce Time
Additional Adjustable Turn On Time C
PDT Pull Up Current
PDT Pull Down Current
Turn Off Interrupt Debounce Time
Internal  P  B Power Down
DebounceTime (Note 4)
Additional Adjustable  P  B Power
Down Debounce Time
Minimum  I  N  T Pulse Width
Maximum  I  N  T Pulse Width
 I  N  T Leakage Current
 I  N  T Output Voltage Low
 K  I  L  L Input Threshold Voltage
 K  I  L  L Input Threshold Hysteresis
 K  I  L  L Leakage Current
 K  I  L  L Minimum Pulse Width
 K  I  L  L Propagation Delay
 K  I  L  L Turn On Blanking (Note 3)
CONDITIONS
2.5V < V
V
V
 P  B Falling
I
Enable Released → Enable Asserted
V
V
I
V
V
ONT Pin Float,  P  B Falling → Enable Asserted
V
V
 P  B Falling →  I  N  T Falling
PDT Pin Float,  P  B Falling → Enable Released
C
 I  N  T Asserted →  I  N  T Released
C
V
I
 K  I  L  L Falling
V
 K  I  L  L Falling → Enable Released
 K  I  L  L = Low, Enable Asserted → Enable Released
 P  B
EN/  E  N
   I  N  T
 P  B
 P  B
EN/  E  N
EN/  E  N
ONT
ONT
ONT
PDT
PDT
PDT
PDT
   I  N  T
 K  I  L  L
= –1µA
= 1V
= 0.6V
= 3mA
= 3V
A
= 0V
= 1.3V
= 1500pF
= 1500pF,  I  N  T Asserted →  I  N  T Released
= 0V
= 1.3V
= 1500pF
= 0.6V
= 500µA
= 1V, Sink Current Off
= 26.4V, Sink Current Off
= 25°C. V
 P  B
< 26.4V
The
●
IN
denotes the specifications which apply over the full operating
= 2.7V to 26.4V, unless otherwise noted. (Note 2)
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
Note 4: To manually force an immediate release of the EN/   E  N pin, the push
button input must be held low for at least t
down timer) + t
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.  P  B is ignored during this lock out
time. This time delay does not include t
PDT
(adjustable by placing external capacitor at PDT pin).
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
–2.4
–2.4
0.57
200
400
0.6
2.4
2.4
–3
–1
26
26
52
26
35
10
30
1
9
9
DB, ON
PD,Min
or t
0.11
11.5
11.5
43.5
0.11
TYP
256
512
0.8
1.6
0.6
–6
–9
–3
32
–3
32
64
32
30
3
3
(internal default power
ONT
DB, ON
LTC2954
.
or t
MAX
±0.1
–3.6
13.5
–3.6
13.5
54.5
0.63
±0.1
–12
–15
325
650
0.4
3.6
3.6
0.4
±1
±1
41
41
82
41
±1
50
30
1
2
ONT
.
UNITS
3
2954f
mV
ms
ms
ms
ms
ms
ms
ms
ms
ms
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µs
µs
V
V
V
V
V