LTC2950CTS8-2 Datasheet, PDF (1/18 Pages) Linear Technology – Pushbutton On/Off Controller

LTC2950-1/LTC2950-2
Pushbutton On/Off
Controller
Features
n _{Adjustable Pushbutton On/Off Timers}
n _{Low Supply Current: 6µA}
n _{Wide Operating Voltage Range: 2.7V to 26.4V}
n _{EN Output (LTC2950-1) Allows DC/DC Converter}
Control
n _{EN Output (LTC2950-2) Allows Circuit Breaker}
Control
n _{Simple Interface Allows Graceful µP Shut Down}
n _{High Input Voltage PB Pin with Internal Pull Up}
Resistor
n _{±10kV ESD HBM on PB Input}
n _{Accurate 0.6V Threshold on KILL Comparator Input}
n _{8-Pin 3mm × 2mm DFN and ThinSOT™ Packages}
Applications
n _{Portable Instrumentation Meters}
n _{Blade Servers}
n _{Portable Customer Service PDA}
n _{Desktop and Notebook Computers}
Description
The LTC^®2950 is a micropower, wide input voltage range,
pushbutton ON/OFF controller. The part contains a pushbut-
ton input with independently programmable ON and OFF
debounce times that control the toggling of an open drain
enable output. The part also contains a simple micropro-
cessor interface to allow for proper system housekeeping
prior to power down. Under system fault conditions, an
internal KILL timer ensures proper power down.
The LTC2950 operates over a wide 2.7V to 26.4V input
voltage range to accommodate a wide variety of input
power supplies. Very low quiescent current (6µA typical)
makes the LTC2950 ideally suited for battery powered
applications. Two versions of the part are available to ac-
commodate either positive or negative enable polarities.
The parts are available in either 8-lead 3mm × 2mm DFN
or ThinSOT packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical Application
V_IN
2.7V TO 26.4V
V_IN
V_OUT
DC/DC
BUCK
SHDN**
R1
V_IN
EN
10k
LTC2950-1 _INT
PB
KILL
GND ONT
OFFT
C_ONT*
0.033µF
C_OFFT*
0.033µF
INT
µP/µC
KILL
2950 TA01
*OPTIONAL
**SHDN INTERNALLY PULLED UP BY DC/DC
Turn On Debounce
EN
2V/DIV
PB
10ms/DIV
2950 TA01b
295012fd
1