LTC2956 - Wake-Up Timer with Pushbutton Control

Features

  • 1.5V to 36V Supply Input Range
  • Adjustable Wake-Up Period: 250ms to 39 Days
  • Adjustable Maximum Awake Time
  • 0.8μA Quiescent Current
  • 0.3μA Shutdown Current
  • Pushbutton Input with Debouncing
  • Low Leakage EN Output Allows DC/DC Converter Control (LTC2956-1)
  • High Voltage EN Output Drives External P-Channel MOSFET (LTC2956-2)
  • ±25kV ESD HBM on PB Input
  • 12-Lead 3mm × 3mm QFN and MSOP Packages

Typical Application

LTC2956 Typical Application
LTC2956 Typical Application

Description

The LTC®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 battery 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC2956CMS-1#PBF MS-12 MS C 05-08-1668 Yes
LTC2956CMS-1#TRPBF MS-12 MS C 05-08-1668 Yes
LTC2956CMS-2#PBF MS-12 MS C 05-08-1668 Yes
LTC2956CMS-2#TRPBF MS-12 MS C 05-08-1668 Yes
LTC2956CUD-1#PBF 3x3 QFN-12 UD C 05-08-1855 Yes
LTC2956CUD-1#TRPBF 3x3 QFN-12 UD C 05-08-1855 Yes
LTC2956CUD-2#PBF 3x3 QFN-12 UD C 05-08-1855 Yes
LTC2956CUD-2#TRPBF 3x3 QFN-12 UD C 05-08-1855 Yes
LTC2956IMS-1#PBF MS-12 MS I 05-08-1668 Yes
LTC2956IMS-1#TRPBF MS-12 MS I 05-08-1668 Yes
LTC2956IMS-2#PBF MS-12 MS I 05-08-1668 Yes
LTC2956IMS-2#TRPBF MS-12 MS I 05-08-1668 Yes
LTC2956IUD-1#PBF 3x3 QFN-12 UD I 05-08-1855 Yes
LTC2956IUD-1#TRPBF 3x3 QFN-12 UD I 05-08-1855 Yes
LTC2956IUD-2#PBF 3x3 QFN-12 UD I 05-08-1855 Yes
LTC2956IUD-2#TRPBF 3x3 QFN-12 UD I 05-08-1855 Yes


LTC2956 Package Drawing
LTC2956 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC2956CMS-1#PBF MS-12 C $2.83 $1.98 Yes
LTC2956CMS-1#TRPBF MS-12 C $2.04 Yes
LTC2956CMS-2#PBF MS-12 C $2.83 $1.98 Yes
LTC2956CMS-2#TRPBF MS-12 C $2.04 Yes
LTC2956CUD-1#PBF 3x3 QFN-12 C $2.83 $1.98 Yes
LTC2956CUD-1#TRPBF 3x3 QFN-12 C $2.04 Yes
LTC2956CUD-2#PBF 3x3 QFN-12 C $2.83 $1.98 Yes
LTC2956CUD-2#TRPBF 3x3 QFN-12 C $2.04 Yes
LTC2956IMS-1#PBF MS-12 I $3.39 $2.38 Yes
LTC2956IMS-1#TRPBF MS-12 I $2.44 Yes
LTC2956IMS-2#PBF MS-12 I $3.39 $2.38 Yes
LTC2956IMS-2#TRPBF MS-12 I $2.44 Yes
LTC2956IUD-1#PBF 3x3 QFN-12 I $3.39 $2.38 Yes
LTC2956IUD-1#TRPBF 3x3 QFN-12 I $2.44 Yes
LTC2956IUD-2#PBF 3x3 QFN-12 I $3.39 $2.38 Yes
LTC2956IUD-2#TRPBF 3x3 QFN-12 I $2.44 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2254A-A LTC2956-1 Demo Board | Wake-Up Timer with Pushbutton Control, EN Pin $25.00
DC2254A-B LTC2956-2 Demo Board | Wake-Up Timer with Pushbutton Control, /EN Pin $25.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Heartbeat Timers
  • Periodic Wake-Up Control
  • Portable and Battery-Powered Equipment
  • Intervalometers
  • Data Acquisition

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC2956-1
LTC2956-2

Technical Support