LTC2950IDDB-2#TRPBF Linear Technology, LTC2950IDDB-2#TRPBF Datasheet - Page 13

• Manufacturer Part Number: LTC2950IDDB-2#TRPBF
• Description: IC PUSH BUTTON ON/OFF CTRLR 8DFN
• Manufacturer: Linear Technology

Specifications of LTC2950IDDB-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: -

Typical applicaTions
below 0.6V, then an appropriate bypass capacitor should
be connected to the KILL pin.
PowerPath™ Switching
The EN open drain output of the LTC2950-2 is designed to
switch on/off an external power PFET. This allows a user
to connect/disconnect a power supply (or battery) to its
load by toggling the PB pin. Figure 7 shows the LTC2950-2
controlling a two cell Li-Ion battery application. The INT
and KILL pins are connected to the output of the PFET
through a resistor divider. The KILL pin serves as a voltage
monitor. When V
circuited 30µs later.
OUT
Li-Ion BATTERY
Li-Ion BATTERY
SINGLE CELL
SINGLE CELL
drops below 6V, the EN pin is open
4.2V
4.2V
+
+
PARASITICS
CERAMIC
Figure 7. PowerPath Control with 6V Undervoltage Detect
0.1µF
C4
NOISE
INDUCTANCE
CAPACITANCE
TRACE
TRACE
GND ONT
V
PB
IN
Figure 8. Noisy PB Trace
LTC2950-2
C
0.033µF
R5
100K
ONT
0.1µF
R6
5k
C5
*
OFFT
KILL
INT
EN
V
PB Pin in a Noisy Environment
The rugged PB pin is designed to operate in noisy envi-
ronments. Transients below ground (>–6V) and above V
(<30V) will not damage the rugged PB pin. Additionally,
the PB pin can withstand ESD HBM strikes up to ±10kV.
In order to keep external noise from coupling inside the
LTC2950, place an R-C network close to the PB pin. A 5k
resistor and a 0.1µF capacitor should suffice for most
noisy applications (see Figure 8).
External Pull-Up Resistor on PB
An internal pull-up resistor on the PB pin makes an ex-
ternal pull-up resistor unnecessary. Leakage current on
C
0.033µF
OPEN DRAIN OUTPUT
V
IN
OFFT
TH
= 0.6V INPUT
GND
*
V
PB
IN
M1
*OPTIONAL
DETAILS OMITTED
FOR CLARITY
LTC2950-1
ONT
LTC2950-1/LTC2950-2
100k
1%
R4
OFFT
KILL
INT
EN
R1
909k
1%
OPTIONAL GLITCH
FILTER CAPACITOR
2950 F08
V
OUT
V
OUT
,TRIP POINT = 6V
C3*
0.1µF
2950 F07
13
295012fd
IN