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Linear Technology Electronic Components Datasheet

LTC2950-1 Datasheet

Push Button On/Off Controller

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LTC2950-1/LTC2950-2
Push Button On/Off
Controller
FEATURES
Adjustable Push Button On/Off Timers
Low Supply Current: 6μA
Wide Operating Voltage Range: 2.7V to 26V
EN Output (LTC2950-1) Allows DC/DC Converter
Control
EN Output (LTC2950-2) Allows Circuit Breaker
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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
APPLICATIONS
Portable Instrumentation Meters
Blade Servers
Portable Customer Service PDA
Desktop and Notebook Computers
DESCRIPTION
The LTC®2950 is a micropower, wide input voltage range,
push button ON/OFF controller. The part contains a push
button input with independently programmable ON and OFF
debounce times that control the toggling of an open drain
enable output. The part also contains a simple micropro-
cessor interface to allow for proper system housekeeping
prior to power down. Under system fault conditions, an
internal KILL timer ensures proper power down.
The LTC2950 operates over a wide 2.7V to 26V input
voltage range to accommodate a wide variety of input
power supplies. Very low quiescent current (6μA typical)
makes the LTC2950 ideally suited for battery powered
applications. Two versions of the part are available to ac-
commodate either positive or negative enable polarities.
The parts are available in either 8-lead 3mm × 2mm DFN
or ThinSOT packages.
L, 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 APPLICATION
VIN
3V – 26V
VIN VOUT
DC/DC
BUCK
SHDN
VIN EN
LTC2950-1 INT
PB
GND ONT
KILL
OFFT
CONT*
0.033μF
COFFT*
0.033μF
R1
10k
INT
μP/μC
KILL
2950 TA01
*OPTIONAL
Turn On Debounce
EN
2V/DIV
PB
10ms/DIV
2950 TA01b
295012fb
1


Linear Technology Electronic Components Datasheet

LTC2950-1 Datasheet

Push Button On/Off Controller

No Preview Available !

LTC2950-1/LTC2950-2
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (VIN) ..................................– 0.3V to 33V
Input Voltages
PB............................................................– 6V to 33V
ONT ......................................................– 0.3V to 2.7V
OFFT......................................................– 0.3V to 2.7V
KILL .........................................................– 0.3V to 7V
Output Voltages
INT.........................................................– 0.3V to 10V
EN/EN ....................................................– 0.3V to 10V
Operating Temperature Range
LTC2950-C1 .............................................. 0°C to 70°C
LTC2950-C2 .............................................. 0°C to 70°C
LTC2950-I1 .......................................... – 40°C to 85°C
LTC2950-I2 .......................................... – 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
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PIN CONFIGURATION
TOP VIEW
GND 1
8 INT
ONT 2
7 EN/EN
9
PB 3
6 OFFT
VIN 4
5 KILL
DDB8 PACKAGE
8-LEAD (3mm s 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 OFFT
6 EN/EN
5 INT
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 140°C/W
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
LTC2950CDDB-1#TRMPBF
LTC2950CDDB-2#TRMPBF
LTC295ICDDB-1#TRMPBF
LTC295ICDDB-2#TRMPBF
LTC2950CTS8-1#TRMPBF
LTC2950CTS8-2#TRMPBF
LTC2950ITS8-1#TRMPBF
LTC2950CDDB-1#TRPBF
LTC2950CDDB-2#TRPBF
LTC295ICDDB-1#TRPBF
LTC295ICDDB-2#TRPBF
LTC2950CTS8-1#TRPBF
LTC2950CTS8-2#TRPBF
LTC2950ITS8-1#TRPBF
LBKP
LBNG
LBKP
LBNG
LTBKN
LTBNF
LTBKN
8-Lead Plastic DFN
8-Lead Plastic DFN
8-Lead Plastic DFN
8-Lead Plastic DFN
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
LTC2950ITS8-2#TRMPBF LTC2950ITS8-2#TRPBF LTBNF
8-Lead Plastic TSOT-23
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
295012fb
2


Part Number LTC2950-1
Description Push Button On/Off Controller
Maker Linear Technology
Total Page 16 Pages
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