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Linear Technology Electronic Components Datasheet

LTC2954 Datasheet

Push Button On/Off Controller

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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 EN Output (LTC2954-2) Allows Circuit
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Simple Interface Allows Graceful µP Shut Down
High Input Voltage PB Pin with Internal Pull Up
Resistor
±10kV ESD HBM on PB Input
Accurate 0.6V Threshold on KILL Comparator Input
8-Pin 3mm × 2mm DFN and ThinSOTTM Packages
APPLICATIOUS
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
VIN VOUT
100k
DC/DC
TURN ON PULSE
PB
SHORT PULSE
LONG PULSE
VIN EN
LTC2954-2 INT
PB
GND ONT
KILL
PDT
1µF
10k
INT
µP/µC
KILL
2954 TA01
tPDT = 6.4 SECONDS
EN
INT
TURNS ON
STAYS ON
TURNS OFF
INTERRUPT
INTERRUPT
2954 TD01b
2954f
1


Linear Technology Electronic Components Datasheet

LTC2954 Datasheet

Push Button On/Off Controller

No Preview Available !

LTC2954
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VIN) ..................................– 0.3V to 33V
Input Voltages
PB............................................................– 6V to 33V
ONT ......................................................– 0.3V to 2.7V
PDT.......................................................– 0.3V to 2.7V
KILL .........................................................– 0.3V to 7V
Output Voltages
INT.........................................................– 0.3V to 10V
EN/EN ....................................................– 0.3V to 33V
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PACKAGE/ORDER
IUFORWATIOU
Operating Temperature Range
LTC2954C-1 .............................................. 0°C to 70°C
LTC2954C-2 .............................................. 0°C to 70°C
LTC2954I-1 .......................................... – 40°C to 85°C
LTC2954I-2 .......................................... – 40°C to 85°C
Storage Temperature Range
DFN Package..................................... – 65°C to 125°C
TSOT-23............................................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
TOP VIEW
GND 1
8 INT
ONT 2
7 EN/EN
PB 3 9 6 PDT
VIN 4
5 KILL
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 165°C/W
EXPOSED PAD (PIN 9) UNCONNECTED
TOP VIEW
VIN 1
PB 2
ONT 3
GND 4
8 KILL
7 PDT
6 EN/EN
5 INT
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 140°C/W
ORDER PART NUMBER DDB PART MARKING* ORDER PART NUMBER TS8 PART MARKING*
LTC2954CDDB-1
LTC2954CDDB-2
LTC2954IDDB-1
LTC2954IDDB-2
LCJG
LCNJ
LCJG
LCNJ
LTC2954CTS8-1
LTC2954CTS8-2
LTC2954ITS8-1
LTC2954ITS8-2
LTCJH
LTCNK
LTCJH
LTCNK
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 2.7V to 26.4V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
VIN
IIN
VUVL
VUVL(HYST)
Supply Voltage Range
VIN Supply Current
VIN Undervoltage Lockout
VIN Undervoltage Lockout
Hysteresis
Push Button, Enable (PB, EN/EN))
VPB(MIN, MAX) PB Voltage Range
CONDITIONS
Steady State Operation
System Power On, VIN = 2.7V to 24V
VIN Falling
Single-Ended
MIN TYP MAX UNITS
2.7
26.4 V
6 12
µA
2.2 2.3 2.5
V
50 400 700
mV
–1
26.4 V
2954f
2


Part Number LTC2954
Description Push Button On/Off Controller
Maker Linear Technology
Total Page 16 Pages
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