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LTC2956CUD-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC2956
1
2956fa
For more information www.linear.com/LTC2956
TYPICAL APPLICATION
FEATURES DESCRIPTION
Wake-Up Timer with
Pushbutton Control
The LT C
®
2956 is a micropower, wide input voltage range,
configurable wake-up timer with pushbutton control. It
periodically wakes up and turns on a connected system
to perform tasks like monitoring temperature or capturing
images. After completing the task, the LTC2956 turns the
system off to conserve power.
The wake-up timer period can be adjusted from 250ms to
39 days using configuration resistors. The system awake
time can be controlled by the input pulse at the SLEEP
pin or adjusted by the capacitor at the ONMAX pin. The
LTC2956 operates over a wide supply input range from
1.5V to 36V. The low 800nA quiescent current suits bat-
tery powered applications.
The pushbutton input allows the user to shutdown, turn
on or reset the wake-up timer. With the timer in shutdown,
the quiescent current drops to 300nA. The LTC2956 also
provides three status outputs to indicate mode transitions
and pushbutton events. Two versions are available for
applications requiring either positive or negative enable
polarities.
APPLICATIONS
n
1.5V to 36V Supply Input Range
n
Adjustable Wake-Up Period: 250ms to 39 Days
n
Adjustable Maximum Awake Time
n
0.8µA Quiescent Current
n
0.3µA Shutdown Current
n
Pushbutton Input with Debouncing
n
Low Leakage EN Output Allows DC/DC Converter
Control (LTC2956-1)
n
High Voltage EN Output Drives External P-Channel
MOSFET (LTC2956-2)
n
±25kV ESD HBM on PB Input
n
12-Lead 3mm × 3mm QFN and MSOP Packages
n
Heartbeat Timers
n
Periodic Wake-Up Control
n
Portable and Battery-Powered Equipment
n
Intervalometers
n
Data Acquisition
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
2956 TA01a
PBOUT
SLEEP
OFFALERT
ONALERT
TURNING OFF
TURNED ON
PB
GND
ONMAX
V
BAT
ENV
IN
RANGE
V
OUT
V
IN
LT3060
SHDN
LTC2956-1
LONG
V
MAIN
1.5nF
µP
100k
10k
1µF
10k
10k
280k 9.76k
PERIOD
100k
t
LONG
= 1s, t
ONMAX
= 20ms, t
PERIOD
= 250ms
+
PB
SLEEP
EN
2956 TA01b
t
SLEEP
t
AWAKE
t
PERIOD
SHORT PRESS STARTS
CYCLING TIMER
LONG PRESS STOPS
CYCLING TIMER
µP SHUTS OFF
POWER
TIMER PERIODICALLY
ENABLES POWER
LTC2956
2
2956fa
For more information www.linear.com/LTC2956
ABSOLUTE MAXIMUM RATINGS
V
IN
(Note 3) ................................................ –0.3V to 40V
Input Voltages:
PB
........................................................... –40V to 40V
SLEEP
...................................................... –0.3V to 6V
LONG, PERIOD, RANGE, ONMAX
............0.3V to 3.6V
Output Voltages:
ONALERT, PBOUT, OFFALERT
................... –0.3V to 6V
EN/EN
.................................................... –0.3V to 40V
Operating Temperature Range:
LTC2956C ................................................ 0°C to 70°C
LTC2956I
.............................................–40°C to 85°C
Storage Temperature Range:
QFN Package
..................................... –65°C to 150°C
MSOP Package
.................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec):
MSOP Package
.................................................300°C
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2956CUD-1#PBF LTC2956CUD-1#TRPBF LGNH 12-Lead (3mm × 3mm) Plastic QFN 0°C to 70°C
LTC2956CUD-2#PBF LTC2956CUD-2#TRPBF LGTC 12-Lead (3mm × 3mm) Plastic QFN 0°C to 70°C
LTC2956IUD-1#PBF LTC2956IUD-1#TRPBF LGNH 12-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
LTC2956IUD-2#PBF LTC2956IUD-2#TRPBF LGTC 12-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
LTC2956CMS-1#PBF LTC2956CMS-1#TRPBF 29561 12-Lead Plastic MSOP 0°C to 70°C
LTC
2956CMS-2#PBF LTC2956CMS-2#TRPBF 29562 12-Lead Plastic MSOP 0°C to 70°C
LTC2956IMS-1#PBF LTC2956IMS-1#TRPBF 29561 12-Lead Plastic MSOP –40°C to 85°C
LTC2956IMS-2#PBF LTC2956IMS-2#TRPBF 29562 12-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard 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/
12 11 10
4 5 6
TOP VIEW
13
GND
UD PACKAGE
12-LEAD (3mm
×
3mm) PLASTIC QFN
7
8
9
3
2
1
ONALERT
ONMAX
LONG
*EN/
EN
PB
GND
SLEEP
OFFALERT
PBOUT
RANGE
PERIOD
V
IN
T
JMAX
= 125°C, θ
JA
= ~68°C/W
EXPOSED PAD (PIN 13) IS GND, PCB CONNECTION OPTIONAL
*PIN 9 IS EN FOR LTC2956-1 AND IS EN FOR LTC2956-2
1
2
3
4
5
6
ONMAX
LONG
RANGE
PERIOD
V
IN
GND
12
11
10
9
8
7
ONALERT
SLEEP
OFFALERT
PBOUT
*EN/EN
PB
TOP VIEW
MS PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 135°C/W
*PIN 8 IS EN FOR LTC2956-1 AND IS EN FOR LTC2956-2
PIN CONFIGURATION
LTC2956
3
2956fa
For more information www.linear.com/LTC2956
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, R
COM
= 100k unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Supply Voltage Range
l
1.5 36 V
I
IN
V
IN
Supply Current Awake State, PB Hi
Sleep State, PB Hi
Off State, PB Hi
l
l
l
3
0.8
0.3
10
3
1
µA
µA
µA
V
UVL
V
IN
Undervoltage Lockout V
IN
Rising
l
1.08 1.24 1.4 V
V
UVL(HYST)
V
IN
Undervoltage Lockout Hysteresis 100 mV
Wake-Up Timer
t
PERIOD
Period Accuracy R
PERIOD
= 100kΩ
l
237 250 263 ms
R
PERIOD
Period-Setting Resistor Range
l
32.4 324 kΩ
Timing (Refer to Timing Diagram)
t
SLEEP_MIN
Minimum Sleep Duration
l
76 128 180 ms
t
AWAKE_MIN
Minimum Awake Time
l
4 8 12 ms
t
ONMAX
Maximum Awake Time SLEEP = 0V, C
ONMAX
= 3900pF
l
32 52 72 ms
t
DB
PB Debounce Time PB Goes Low → EN Goes High
l
19 32 45 ms
t
PD(SLEEP)
SLEEP Propagation Delay SLEEP → EN Transitions
l
2 4 ms
t
PBOUT_FIRST
Width of First PBOUT Pulse After Entering Awake State
l
76 128 180 ms
t
LONG
Long Power Down Time R
LONG
= 9.76k, R
COM
= 100k
R
LONG
= Open, R
COM
= 100k
l
l
76
9.83
128
16.4
180
22.9
ms
s
t
OFF
OFFALERT Pulse Width PB = 2V
l
0.6 1 1.4 s
Input Pins: PB, ONMAX, SLEEP
V
PB(MIN,MAX)
PB Voltage Range
l
–36 36 V
I
PB
PB Input Current PB = 0V
PB = –36V
l
–1 –4 –8
–400
µA
µA
V
PB(TH)
PB Input Threshold PB Falling
l
0.5 0.9 1.5 V
V
PB(HYST)
PB Input Hysteresis 0.7 V
V
PB(OC)
PB Open Circuit Voltage I
PB
= 0µA, –1µA
l
1.5 V
R
PB
PB Pull-Up Resistance
l
0.45 0.9 1.35 MΩ
V
SLEEP(TH)
SLEEP Input Threshold Voltage SLEEP Falling
l
0.7 1 1.3 V
V
SLEEP(HYST)
SLEEP Input Hysteresis 80 mV
I
SLEEP
SLEEP Leakage Current SLEEP = 1V
l
0 ±100 nA
V
ONMAX(TH)
ONMAX Input Threshold Voltage ONMAX Rising
l
0.6 1 1.5 V
I
ONMAX
ONMAX Pull-Up Current ONMAX = 0V
l
–1.1 –2 –2.8 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC2956CUD-1#PBF

Mfr. #:
Buy LTC2956CUD-1#PBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Wake-Up Timer w/ Pushbutton Control
Lifecycle:
New from this manufacturer.
Delivery:
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