LTC2950CDDB-1#PBF Linear Technology, LTC2950CDDB-1#PBF Datasheet - Page 3

• Manufacturer Part Number: LTC2950CDDB-1#PBF
• Manufacturer: Linear Technology

Specifications of LTC2950CDDB-1#PBF

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 8
• Mounting: Surface Mount
• Package Type: DFN EP
• Case Length: 3mm
• Screening Level: Commercial
• Lead Free Status / RoHS Status: Compliant

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
V
I
V
V
Push Button Pin (PB)
V
I
V
V
Debounce Timing Pins (ONT, OFFT)
I
I
t
t
t
t
μP Handshake Pins (INT, KILL)
I
V
V
V
I
t
t
t
t
t
I
V
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
suffi cient 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
IN
PB
ONT, OFFT(PU)
ONT, OFFT(PD)
DB, On
ONT
DB, Off
OFFT
INT(LKG)
KILL(LKG)
KILL(PW)
KILL(PD)
KILL, On Blank
KILL, Off Delay
EN/EN, Lock Out
EN/EN(LKG)
IN
UVL
UVL(HYST)
PB(MIN, MAX)
PB(VTH)
PB(VOC)
INT(VOL)
KILL(TH)
KILL(HYST)
EN/EN(VOL)
PARAMETER
Supply Voltage Range
V
V
V
Hysteresis
PB Voltage Range
PB Input Current
PB Input Threshold
PB Open Circuit Voltage
ONT/OFFT Pull Up Current
ONT/OFFT Pull Down Current
Internal Turn On Debounce Time
Additional Adjustable Turn On Time C
Internal Turn Off Debounce Time
Additional Adjustable Turn Off Time C
INT Leakage Current
INT Output Voltage Low
KILL Input Threshold Voltage
KILL Input Threshold Hysteresis
KILL Leakage Current
KILL Minimum Pulse Width
KILL Propagation Delay
KILL Turn On Blanking (Note 3)
KILL Turn Off Delay (Note 4)
EN/EN Lock Out Time (Note 5)
EN/EN Leakage Current
EN/EN Voltage Output Low
IN
IN
IN
Supply Current
Undervoltage Lockout
Undervoltage Lockout
DB, ON
CONDITIONS
Steady State Operation
System Power On, V
V
Single-Ended
2.5V < V
V
V
PB Falling
I
V
V
ONT Pin Float, PB Falling → Enable Asserted
OFFT Pin Float, PB Falling → INT Falling
V
I
KILL Falling
V
KILL Falling → Enable Released
KILL = Low, Enable Asserted → Enable Released
KILL = High, INT Asserted → Enable Released
Enable Released → Enable Asserted
V
I
PB
INT
EN/ EN
IN
PB
PB
ONT, OFFT
ONT, OFFT
ONT
OFFT
INT
KILL
EN/ EN
or t
= –1μA
Falling
= 3mA
= 1V
= 0.6V
ONT
= 3V
A
= 1500pF
= 0.6V
= 1500pF
= 3mA
= 25°C. V
= 1V, Sink Current Off
.
PB
= 0V
= 1.3V
< 26.4V
The
l
IN
denotes the specifi cations which apply over the full operating
= 2.7V to 26.4V, unless otherwise noted. (Note 2)
IN
= 2.7V to 24V
Note 4: The KILL turn off delay is the maximum delay from the initiation
of a shutdown sequence (INT falling), to the release of the enable output.
If the KILL input switches low at any time during this period, enable is
released, thus turning off system power. This time is internally fi xed at
1024ms. This time delay does not include 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 confi guration. PB is ignored during this lock
out time. This time delay does not include t
LTC2950-1/LTC2950-2
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
–2.4
0.57
400
800
200
2.7
2.2
0.6
2.4
–3
50
–1
–1
26
26
10
30
1
9
9
DB, OFF
DB, ON
1024
11.5
11.5
0.11
0.11
TYP
300
512
256
2.3
0.8
1.6
0.6
–6
–9
–3
32
32
30
6
3
or t
or t
ONT
OFFT
.
1300
.
MAX
26.4
26.4
–3.6
13.5
13.5
0.63
±0.1
±0.1
600
–12
–15
650
325
2.4
3.6
0.4
0.4
12
±1
41
41
±1
50
30
1
2
295012fc
UNITS
3
mV
mV
ms
ms
ms
ms
ms
ms
ms
μA
μA
μA
μA
μA
μA
μA
μA
μA
μs
μs
V
V
V
V
V
V
V
V