LTC2954_15 Datasheet, PDF (1/18 Pages) Linear Technology – Pushbutton On/Off Controller with P Interrupt

FEATURES
n _{Adjustable Power On/Off Timers}
n _{Low Supply Current: 6μA}
n _{Wide Operating Voltage Range: 2.7V to 26.4V}
n _{Low Leakage EN Output (LTC2954-1) Allows DC/DC}
Converter Control
n _{High Voltage EN Output (LTC2954-2) Allows Circuit}
Breaker Control
n _{Simple Interface Allows Graceful μP Shutdown}
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 _{Pushbutton PowerPath™ Control}
n _{Portable Instrumentation Meters}
n _{Blade Servers}
n _{Portable Customer Service PDA}
n _{Desktop and Notebook Computers}
LTC2954
Pushbutton On/Off
Controller with µP Interrupt
DESCRIPTION
The LTC^®2954 is a pushbutton on/off controller that
manages system power via a pushbutton interface. An
enable output toggles system power while an interrupt
output provides debounced pushbutton 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
adjustable on and off timers allow dependable pushbutton
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 volt-
age 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
TYPICAL APPLICATION
+
9V
100k
V_IN
V_OUT
DC/DC
100k
V_IN
EN
LTC2954-2 _INT
PB
KILL
GND ONT
PDT
1μF
10k
INT
μP/μC
KILL
2954 TA01a
t_PDT = 6.4 SECONDS
Pushbutton On/Off with Interrupt
TURN-ON PULSE
PB
SHORT PULSE
LONG PULSE
EN
TURNS ON
STAYS ON
TURNS OFF
INT
INTERRUPT
INTERRUPT
2954 TA01b
2954fb
1