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Linear Technology Electronic Components Datasheet

LTC2951-1 Datasheet

Push Button On/Off Controller

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LTC2951-1/LTC2951-2
Push Button On/Off
Controller
FEATURES
Adjustable Push Button Debounce and Delay
Timers
Low Supply Current: 6µA
Wide Operating Voltage Range: 2.7V to 26V
EN Output (LTC2951-1) Allows DC/DC Converter
Control
www.DaEtNaSOheuetpt4uUt.c(LoTmC2951-2) Allows Circuit Breaker
Control
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
U
APPLICATIO S
Portable Instrumentation Meters
Blade Servers
Portable Customer Service PDA
Desktop and Notebook Computers
DESCRIPTIO
The LTC®2951 is a micropower, wide input voltage range
push button ON/OFF controller. The part contains a push
button input which controls the toggling of an open drain
enable output. The push button turn OFF debounce time
is externally programmable, while the turn ON debounce
time is fixed at 128ms. A simple microprocessor interface
allows for proper system housekeeping prior to power
down. Under system fault conditions, an adjustable KILL
timeout delay ensures proper power down.
The LTC2951 operates over a 2.7V to 26V input voltage
range to accommodate a variety of input power supplies.
Very low quiescent current (6µA typical) makes the
LTC2951 ideally suited for battery powered applications.
Two versions of the part are available to accommodate
either positive or negative enable polarities. The parts
are available in 8-pin 3mm × 2mm DFN and ThinSOT
packages.
, 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
VIN
3V – 26V
VIN VOUT
DC/DC
BUCK
SHDN
VIN EN
LTC2951-1 INT
PB
GND KILLT
KILL
OFFT
CKILLT*
0.033µF
COFFT*
0.033µF
R1
10k
INT
µP/µC
KILL
2951 TA01
*OPTIONAL
Turn On Debounce
EN
2V/DIV
PB
128ms
25ms/DIV
2951 TA01b
295112fa
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Linear Technology Electronic Components Datasheet

LTC2951-1 Datasheet

Push Button On/Off Controller

No Preview Available !

LTC2951-1/LTC2951-2
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VIN) ..................................– 0.3V to 33V
Input Voltages
PB............................................................– 6V to 33V
KILLT ....................................................– 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
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
Operating Temperature Range
LTC2951C-1 .............................................. 0°C to 70°C
LTC2951C-2 .............................................. 0°C to 70°C
LTC2951I-1 .......................................... – 40°C to 85°C
LTC2951I-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
KILLT 2
7 EN/EN
9
PB 3
6 OFFT
VIN 4
5 KILL
DDB8 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
KILLT 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 PART
NUMBER
DDB PART*
MARKING
ORDER PART
NUMBER
LTC2951CDDB-1
LTC2951CDDB-2
LTC2951IDDB-1
LTC2951IDDB-2
LBTB
LBTD
LBTB
LBTD
LTC2951CTS8-1
LTC2951CTS8-2
LTC2951ITS8-1
LTC2951ITS8-2
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 factory for parts specified with wider operating temperature ranges.
* The temperature grade is identified by a label on the shipping container.
TS8 PART*
MARKING
LTBTC
LTBTF
LTBTC
LTBTF
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
CONDITIONS
MIN TYP MAX UNITS
VIN
IIN
VUVL
VUVL(HYST)
Supply Voltage Range
VIN Supply Current
VIN Undervoltage Lockout
VIN Undervoltage Lockout Hysteresis
Steady State Operation
System Power On, VIN = 2.7V to 24V
VIN Falling
2.7
2.2
50
26.4
6 12
2.3 2.4
300 600
V
µA
V
mV
295112fa
2


Part Number LTC2951-1
Description Push Button On/Off Controller
Maker Linear Technology
Total Page 16 Pages
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