LTC2955
Pushbutton On/Off
Controller with Automatic
Turn-On
Fea T Descrip T
n
Automatic Turn-On Via Voltage Monitor Input
The LTC 2955 is a micropower, pushbutton on/off control-
n
Wide Input Supply Range: 1.5V to 36V
ler that manages system power by generating a clean enable
n
Low Supply Current: 1.2A
output from the supply monitor input and the debounced
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25kV ESD HBM on PB Input
pushbutton input. It features an interrupt output that
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36V Wide Input Voltage for PB Input
notifies the system of a pushbutton or low supply event.
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Low Leakage EN Output Allows DC/DC Converter
When the system is ready, it may use the power kill input
Control (LTC2955-1)
to shut off power. If the pushbutton remains pressed for
n
High Voltage EN Output Drives External P-Channel
more than the configurable turn-off duration, the system
MOSFET (LTC2955-2)
power is forced off.
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Simple Interface Allows Graceful P Shutdown
The supply input covers a wide range from 1.5V to 36V.
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Adjustable Turn-Off Timer
The robust pushbutton input handles wide voltage swings
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10-Lead 3mm 2mm DFN and 8-Lead ThinSOT
of 36V and ESD strikes to 25kV (human body model)
Packages
without latchup or damage. A low 1.2A supply current
maximizes battery run time. Separate versions are avail-
able for positive or negative enable polarities.
a T
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
n ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
Desktop and Notebook Computers
are the property of their respective owners.
n
GPS Devices
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Portable Instruments
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Automotive Electronics
Typical a T
Automatic Turn-On with Power-Fail Indication Pushbutton On/Off with Interrupt
V = 5.4V
TRIP
LT3008-3.3
TURN ON PULSE SHORT PULSE LONG PULSE
3.3V
V V
8.4V
IN OUT
PB
SHDN
R7
1M
1M
EN
V
TURNS ON STAYS ON TURNS OFF
IN
EN
LTC2955DDB-1
0.1F
2.32M
SEL INT
P
ON KILL
INT
PGD
402k PB
INTERRUPT INTERRUPT
TMR GND
2955 TA01b
POWER-FAIL
2955 TA01a
2955fa
1
For more information www.linear.com/LTC2955
ion pplica
ions pplica
ion uresLTC2955
a Te Maxi Mu M r a T
(Note 1)
V ............................................................. 0.3V to 40V
IN Operating Temperature Range
Input Voltages
LTC2955C ................................................ 0C to 70C
PB ........................................................... 40V to 40V
LTC2955I .............................................40C to 85C
ON ......................................................... 0.3V to 40V
Storage Temperature Range .................. 65C to 150C
SEL ........................................................ 0.3V to 40V
Lead Temperature (Soldering, 10 sec)
KILL ......................................................... 0.3V to 6V
TSOT-23 Package .............................................300C
Output Voltages
EN/EN .................................................... 0.3V to 40V
INT ........................................................... 0.3V to 6V
PGD ......................................................... 0.3V to 6V
TMR ...................................................... 0.3V to 2.7V
p in c F T
TOP VIEW
TOP VIEW
1 10
INT ON
2 9
PGD KILL ON 1 8 INT
KILL 2 7 EN/EN*
3 11
*EN/EN 8 TMR
TMR 3 6 V
IN
4 7
V SEL
IN
GND 4 5 PB
5 6
PB GND
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DDB PACKAGE
10-LEAD (3mm 2mm) PLASTIC DFN T = 125C, = 195C/W
JMAX JA
*PIN 7 IS EN FOR LTC2955-1
T = 125C, = 55C/W
JMAX JA
AND IS EN FOR LTC2955-2
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
*PIN 3 IS EN FOR LTC2955-1
AND IS EN FOR LTC2955-2
o r Der i n F Ma T (