LTC2950 LINER [Linear Technology], LTC2950 Datasheet - Page 3

• Manufacturer Part Number: LTC2950
• Description: Push Button On/Off Controller
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
SYMBOL
Push Button Pin ( ⎯ P ⎯ B )
V
I
V
V
Timing Pins (KILLT, OFFT)
I
I
t
t
t
µP Handshake Pins ( ⎯ I ⎯ N ⎯ T , ⎯ K ⎯ I ⎯ L ⎯ L )
I
V
V
V
I
t
t
t
t
t
ADDITIONAL
t
I
V
temperature range, otherwise specifi cations are at T
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
suffi cient 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 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
⎯ P ⎯ B
KILLT, OFFT(PU)
KILLT, OFFT(PD)
DB, ON
DB, OFF
OFFT
⎯ I ⎯ N ⎯ T (LKG)
⎯ K ⎯ I ⎯ L ⎯ L (LKG)
EN/ ⎯ E ⎯ N , Lock Out
EN/ ⎯ E ⎯ N (LKG)
⎯ K ⎯ I ⎯ L ⎯ L (PW)
⎯ K ⎯ I ⎯ L ⎯ L (PD)
⎯ K ⎯ I ⎯ L ⎯ L , ON BLANK
⎯ K ⎯ I ⎯ L ⎯ L , OFF DELAY
⎯ K ⎯ I ⎯ L ⎯ L , OFF DELAY,
⎯ P ⎯ B (MIN, MAX)
⎯ P ⎯ B (VTH)
⎯ P ⎯ B (VOC)
⎯ I ⎯ N ⎯ T (VOL)
⎯ K ⎯ I ⎯ L ⎯ L (TH)
⎯ K ⎯ I ⎯ L ⎯ L (HYST)
EN/ ⎯ E ⎯ N (VOL)
PARAMETER
⎯ P ⎯ B Voltage Range
⎯ P ⎯ B Input Current
⎯ P ⎯ B Input Threshold
⎯ P ⎯ B Open Circuit Voltage
KILLT/OFFT Pull Up Current
KILLT/OFFT Pull Down Current
Turn On Debounce Time
Internal Turn Off Debounce Time
Additional Adjustable Turn Off Time C
⎯ 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)
Internal ⎯ K ⎯ I ⎯ L ⎯ L Turn Off Delay
(Note 4)
Additional Adjustable ⎯ K ⎯ I ⎯ L ⎯ L Turn Off
Delay (Note 4)
EN/ ⎯ E ⎯ N Lock Out Time (Note 5)
EN/ ⎯ E ⎯ N Leakage Current
EN/ ⎯ E ⎯ N Voltage Output Low
A
CONDITIONS
Single-Ended
2.5V < V
V
V
⎯ P ⎯ B Falling
I
V
V
⎯ P ⎯ B Falling → Enable Asserted
OFFT Pin Float, ⎯ P ⎯ B Falling → ⎯ I ⎯ N ⎯ T Falling
V
I
⎯ K ⎯ I ⎯ L ⎯ L Falling
V
⎯ K ⎯ I ⎯ L ⎯ L Falling → Enable Released
⎯ K ⎯ I ⎯ L ⎯ L = Low, Enable Asserted → Enable
Released
KILLT Pin Float, ⎯ K ⎯ I ⎯ L ⎯ L = High, ⎯ ⎯ I ⎯ ⎯ ⎯ N ⎯ ⎯ ⎯ T Asserted →
Enable Released
C
Enable Released → Enable Asserted
V
I
⎯ P ⎯ B
⎯ ⎯ ⎯ I ⎯ N ⎯ T
EN/ ⎯ E ⎯ N
⎯ P ⎯ B
⎯ P ⎯ B
KILLT, OFFT
KILLT, OFFT
OFFT
⎯ ⎯ ⎯ I ⎯ N ⎯ T
KILLT
EN/ ⎯ E ⎯ N
⎯ K ⎯ I ⎯ L ⎯ L
= 25°C. V
= –1µA
= 1V
= 0.6V
= 3mA
DB, ON
= 3V
= 0.6V
= 1500pF
= 1500pF
= 3mA
= 1V, Sink Current Off
The
⎯ P ⎯ B
.
< 26.4V
= 0V
= 1.3V
●
IN
denotes the specifi cations which apply over the full operating
= 2.7V to 26.4V, unless otherwise noted. (Note 2)
Note 4: The internal ⎯ K ⎯ I ⎯ L ⎯ L turn off delay (t
delay from the initiation of a power off sequence ( ⎯ I ⎯ N ⎯ T falling, ⎯ K ⎯ I ⎯ L ⎯ L = high),
to the release of the enable output. The additional, adjustable ⎯ K ⎯ I ⎯ L ⎯ L turn
off delay (t
(C
output. If the ⎯ K ⎯ I ⎯ L ⎯ L input switches low at any time during ⎯ K ⎯ I ⎯ L ⎯ L turn off
delay, enable is released, thus turning off system power.
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 confi guration. ⎯ P ⎯ B is ignored during this lock out
time. This time delay does not include t
KILLT
) to provide extra delay from ⎯ I ⎯ N ⎯ T falling to the release of the enable
⎯ K ⎯ I ⎯ L ⎯ L
,
OFF DELAY, ADDITIONAL
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
) uses an optional external capacitor
–2.4
0.57
MIN
100
400
100
200
0.6
2.4
–3
–1
–1
26
10
30
DB, ON
1
9
9
⎯ K ⎯ I ⎯ L ⎯ L
,
.
OFF DELAY
11.5
0.11
11.5
0.11
TYP
128
512
128
256
0.8
1.6
0.6
–9
–6
–3
32
30
3
LTC2951
) is the default
MAX
26.4
–3.6
13.5
0.63
±0.1
13.5
±0.1
–15
–12
163
650
163
325
3.6
0.4
0.4
±1
41
±1
50
30
1
2
UNITS
3
2951f
mV
ms
ms
ms
ms
ms
ms
ms
µA
µA
µA
µA
µA
µA
µA
µA
µs
µs
V
V
V
V
V
V