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Linear Technology DC826B-B - LTC2951CTS8-2 | On/Off Controller, Vin (26.4V Max) = 2.7V - 26.4V DC826B-B DC826B-B Data Sheet

Product codes
DC826B-B
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Page of 20
LTC2951-1/LTC2951-2
3
295112fb
 The 
l
 denotes the specifications which apply over the full operating 
temperature range, otherwise specifications are at T
A
 = 25°C. V
IN
 = 2.7V to 26.4V, 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: 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
.
Note 4: The internal KILL turn-off delay (t
KILL
,
 OFF DELAY
) is the default 
delay from the initiation of a power-off sequence (INT falling, KILL = high), 
to the release of the enable output. The additional, adjustable KILL turn-off 
delay (t
KILL
,
 OFF DELAY, ADDITIONAL
) uses an optional external capacitor 
(C
KILLT
) to provide extra delay from INT falling to the release of the enable 
output. If the KILL input switches low at any time during KILL turn-off 
delay, enable is released, thus turning off system power.
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
. 
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Supply Voltage Range
Steady-State Operation
l
2.7
26.4
V
I
IN
V
IN
 Supply Current
System Power-On, V
IN
 = 2.7V to 24V
l
6
12
µA
V
UVL
V
IN
 Undervoltage Lockout
V
IN
 Falling
l
2.2
2.3
2.4
V
V
UVL(HYST)
V
IN
 Undervoltage Lockout Hysteresis
l
50
300
600
mV
Pushbutton, Enable (PB, EN/ EN)
V
PB(MIN, MAX)
PB Voltage Range
Single-Ended
l
–1
26.4
V
I
PB
PB Input Current
2.5V < V
PB
 < 26.4V 
V
PB
 = 1V 
V
PB
 = 0.6V
l 
l 
l
 
–1 
–3
 
–6 
–9
±1 
–12 
–15
µA 
µA 
µA
V
PB(VTH)
PB Input Threshold
PB Falling
l
0.6
0.8
1
V
t
EN/EN, Lockout
EN/EN Lockout Time (Note 5)
Enable Released 
→ Enable Asserted
l
200
256
325
ms
I
EN/EN(LKG)
EN/EN Leakage Current
V
EN/EN
 = 1V, Sink Current Off
l
±0.1
µA
V
EN/EN(VOL)
EN/EN Voltage Output Low
I
EN/EN
 = 3mA
l
0.11
0.4
V
V
PB(VOC)
PB Open-Circuit Voltage
I
PB
 = –1µA
l
1
1.6
2
V
Timing Pins (KILLT, OFFT)
I
KILLT, OFFT(PU)
KILLT/OFFT Pull-Up Current
V
KILLT, OFFT
 = 0V
l
–2.4
–3
–3.6
µA
I
KILLT, OFFT(PD)
KILLT/OFFT Pull-Down Current
V
KILLT, OFFT
 = 1.3V
l
2.4
3
3.6
µA
t
DB, ON
Turn-On Debounce Time
PB Falling 
→ Enable Asserted
l
100
128
163
ms
t
DB, OFF
Internal Turn-Off Debounce Time
OFFT Pin Float, PB Falling 
→ INT Falling
l
26
32
41
ms
t
OFFT
Additional Adjustable Turn-Off Time
C
OFFT
 = 1500pF
l
9
11.5
13.5
ms
µP Handshake Pins (INT, KILL)
I
INT(LKG)
INT Leakage Current
V
INT
 = 3V
l
±1
µA
V
INT(VOL)
INT Output Voltage Low
I
INT
 = 3mA
l
0.11
0.4
V
V
KILL(TH)
KILL Input Threshold Voltage
KILL Falling
l
0.57
0.6
0.63
V
V
KILL(HYST)
KILL Input Threshold Hysteresis
l
10
30
50
mV
I
KILL(LKG)
KILL Leakage Current
V
KILL
 = 0.6V
l
±0.1
µA
t
KILL(PW)
KILL Minimum Pulse Width
l
30
µs
t
KILL(PD)
KILL Propagation Delay
KILL Falling 
→ Enable Released
l
30
µs
t
KILL, ON BLANK
KILL Turn-On Blanking (Note 3)
KILL = Low, Enable Asserted 
→ Enable Released
l
400
512
650
ms
t
KILL, OFF DELAY
Internal KILL Turn-Off Delay (Note 4)
KILLT Pin Float, KILL = High, INT Asserted 
→ 
Enable Released
l
100
128
163
ms
t
KILL,OFF DELAY, 
ADDITIONAL
Additional Adjustable KILL Turn-Off Delay 
(Note 4)
C
KILLT
 = 1500pF
l
9
11.5
13.5
ms