LTC2951 Datasheet, PDF (1/16 Pages) Linear Technology – Push Button On/Off Controller

LTC2951
Push Button On/Off
Controller
FEATURES
■ _{Adjustable Push Button Debounce and Delay}
Timers
■ _{Low Supply Current: 6µA}
■ _{Wide Operating Voltage Range: 2.7V to 26V}
■ _{EN Output (LTC2951-1) Allows DC/DC Converter}
Control
■ ⎯_E⎯_{N Output (LTC2951-2) Allows Circuit Breaker}
Control
■ _{Simple Interface Allows Graceful µP Shut Down}
■ _{High Input Voltage} ⎯_P⎯_{B Pin with Internal Pull Up}
Resistor
■ _{±10kV ESD HBM on} ⎯_P⎯_{B Input}
■ _{Accurate 0.6V Threshold on} ⎯_K⎯_I⎯_L⎯_{L Comparator Input}
■ _{8-Pin 3mm × 2mm DFN and ThinSOT}^TM _Packages
U
APPLICATIO S
■ _{Portable Instrumentation Meters}
■ _{Blade Servers}
■ _{Portable Customer Service PDA}
■ _{Desktop and Notebook Computers}
DESCRIPTIO
The LTC^®2951 is a micropower, wide input voltage range
push button ON/OFF controller. The part contains a push
button input which controls the toggling of an open drain
enable output. The push button turn OFF debounce time
is externally programmable, while the turn ON debounce
time is fixed at 128ms. A simple microprocessor interface
allows for proper system housekeeping prior to power
down. Under system fault conditions, an adjustable ^⎯K^⎯I^⎯L^⎯L
timeout delay ensures proper power down.
The LTC2951 operates over a 2.7V to 26V input voltage
range to accommodate a variety of input power supplies.
Very low quiescent current (6µA typical) makes the
LTC2951 ideally suited for battery powered applications.
Two versions of the part are available to accommodate
either positive or negative enable polarities. The parts
are available in 8-pin 3mm × 2mm DFN and ThinSOT
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
TYPICAL APPLICATIO
V_IN
3V – 26V
V_IN
V_OUT
DC/DC
BUCK
SHDN
V_IN
EN
LTC2951-1 _INT
PB
GND KILLT
KILL
OFFT
C_KILLT*
0.033µF
C_OFFT*
0.033µF
R1
10k
INT
µP/µC
KILL
2951 TA01
*OPTIONAL
Turn On Debounce
EN
2V/DIV
PB
128ms
25ms/DIV
2951 TA01b
2951f
1