LTC2951IDDB-2#TRPBF Linear Technology, LTC2951IDDB-2#TRPBF Datasheet - Page 14

• Manufacturer Part Number: LTC2951IDDB-2#TRPBF
• Description: IC PUSH BUTTON ON/OFF CTRLR 8DFN
• Manufacturer: Linear Technology

Specifications of LTC2951IDDB-2#TRPBF

• Applications: Push Button, On/Off Controller
• Voltage - Supply: 2.7 V ~ 26.4 V
• Current - Supply: 6µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -

LTC2951-1/LTC2951-2
TYPICAL APPLICATIONS
Voltage Monitoring with KILL Input
The KILL pin can be used as a voltage monitor. Figure
5 shows an application where the KILL pin has a dual
function. It is driven by a low leakage open-drain output
of the µP . It is also connected to a resistor divider that
monitors battery voltage (V
falls below the set value, the voltage at the KILL pin falls
below 0.6V and the EN pin is quickly pulled low. Note
that the resistor values should be as large as possible,
but small enough to keep leakage currents from tripping
the 0.6V KILL comparator.
14
2951 F06
V
IN
V
IN
IN
2951 F05
9V
). When the battery voltage
9V
C4
0.1µF
C4
0.1µF
V
PB
GND
Figure 5. Input Voltage Monitoring with KILL Input
V
C3*
PB
0.01µF
GND
5.4V THRESHOLD
IN
IN
KILLT
LTC2951-1
KILLT
LTC2951-1
C
0.033µF
C
0.033µF
KILLT
KILLT
Figure 6. No µP Application
*
*
OFFT
KILL
INT
OFFT
EN
KILL
INT
EN
C
0.033µF
C
0.033µF
OFFT
806k
100k
OFFT
1%
1%
R3
R2
*
*
The DC/DC converter shown has an internal pull-up cur-
rent on its SHDN pin. A pull-up resistor on EN is thus not
needed.
Operation without µP
Figure 6 shows how to connect the KILL pin when there
is no circuitry available to drive it. The minimum pulse
width detected is 30µs. If there are glitches on the resis-
tor pull-up voltage that are wider than 30µs and transition
below 0.6V, then an appropriate bypass capacitor should
be connected to the KILL pin.
V
SHDN**
V
SHDN**
IN
LT1767-3.3
IN
LT1767-3.3
**SHDN INTERNALLY PULLED UP BY THE LT1767-3.3
R1
10k
**SHDN INTERNALLY PULLED UP BY THE LT1767-3.3
*OPTIONAL
*OPTIONAL
V
V
OUT
INT
KILL
(OPEN DRAIN)
OUT
+
µP
R1
100k
3.3V
C3*
0.01µF
3.3V
295112fb