LTC2954 Datasheet, PDF (1/16 Pages) Linear Technology – Push Button On/Off Controller with μP Interrupt

LTC2954
Push Button On/Off
Controller with μP Interrupt
FEATURES
■ _{Adjustable Power On/Off Timers}
■ _{Low Supply Current: 6µA}
■ _{Wide Operating Voltage Range: 2.7V to 26.4V}
■ _{Low Leakage EN Output (LTC2954-1) Allows DC/DC}
Converter Control
■ _{High Voltage} _E_{N Output (LTC2954-2) 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
■ _{Push Button Power Path Control}
■ _{Portable Instrumentation Meters}
■ _{Blade Servers}
■ _{Portable Customer Service PDA}
■ _{Desktop and Notebook Computers}
DESCRIPTIO
The LTC^®2954 is a push button On/Off controller that
manages system power via a push button interface. An
enable output toggles system power while an interrupt
output provides debounced push button status. The inter-
rupt output can be used in menu driven applications to
request a system power down. A power kill input allows
a microprocessor or system to reset the enable output,
effectively powering down the system. Independently ad-
justable On and Off timers allow dependable push button
control of the enable output and resistance to accidental
toggling of system power.
The LTC2954 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 LTC2954 ideally suited for battery powered applications.
Two versions of the part are available to accommodate
either positive or negative enable polarities.
, LT, LTC and LTM 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
Push Button On/Off with Interrupt
+
9V
100k
V_IN
V_OUT
DC/DC
100k
TURN ON PULSE
PB
SHORT PULSE
LONG PULSE
V_IN
EN
LTC2954-2 _INT
PB
KILL
GND ONT
PDT
1µF
EN
10k
INT
INT
µP/µC
KILL
2954 TA01
t_PDT = 6.4 SECONDS
TURNS ON
STAYS ON
TURNS OFF
INTERRUPT
INTERRUPT
2954 TD01b
2954f
1