LTC2954
Push Button On/Off
Controller with μP Interrupt
FEATURES
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.
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Adjustable Power On/Off Timers
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Low Supply Current: 6µA
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Wide Operating Voltage Range: 2.7V to 26.4V
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Low Leakage EN Output (LTC2954-1) Allows DC/DC
Converter Control
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High Voltage EN Output (LTC2954-2) Allows Circuit
Breaker Control
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Simple Interface Allows Graceful µP Shut Down
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High Input Voltage PB Pin with Internal Pull Up
Resistor
±10kV ESD HBM on PB Input
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Accurate 0.6V Threshold on KILL Comparator Input
The LTC2954 operates over a wide 2.7V to 26.4V input
voltagerangetoaccommodateawidevarietyofinputpower
supplies. Very low quiescent current (6µA typical) makes
theLTC2954ideallysuitedforbatterypoweredapplications.
Two versions of the part are available to accommodate
either positive or negative enable polarities.
8-Pin 3mm × 2mm DFN and ThinSOTTM Packages
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APPLICATIO S
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Push Button Power Path Control
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Portable Instrumentation Meters
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Blade Servers
, 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.
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Portable Customer Service PDA
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Desktop and Notebook Computers
U
TYPICAL APPLICATIO
Push Button On/Off with Interrupt
V
IN
V
OUT
SHORT PULSE
TURN ON PULSE
LONG PULSE
DC/DC
+
PB
EN
100k
100k
9V
TURNS ON
STAYS ON
TURNS OFF
INTERRUPT
10k
V
EN
IN
LTC2954-2
ONT
INT
INT
INT
µP/µC
INTERRUPT
KILL
PDT
KILL
PB
2954 TD01b
GND
2954 TA01
1µF
t
= 6.4 SECONDS
PDT
2954f
1