The LTC2956 is ideal for single-cell and multi-cell high-voltage devices such as intervalometers because it is easy to use, provides a wide operating range, and draws minimal current at the nano level. Devices such as intervalometers are used not only in time-lapse photography or military countermeasure applications but also in "heartbeat" timers. The ±25kV ESD-protected push button input initiates the wake-up timer, allowing users to briefly press the push button to interrupt the timer if early wake-up occurs, or to press and hold the push button when the timer is completely stopped and the entire system is placed in standby at 300nA IQ. The LTC2956 can also be configured to automatically operate the wake-up timer and supply power without requiring a push button press. Using an adjustable watchdog timer, users can limit the time the system remains "active" to protect against a malfunctioning microcontroller or software keeping the system powered indefinitely until battery power is depleted.

The LTC2956 is available in both positive (LTC2956-1) and negative (LTC2956-2) enable polarity, and is offered in 12-pin 3mm x 3mm DFN or 12-pin MSOP packages. Available in commercial and industrial temperature ranges, the LTC2956 is offered at $1.98 per unit at quantities of 1,000. For more information, refer to www.linear.com/pushbutton.

Product Features: LTC2956

• Wide input power range: 1.5V to 36V

• Adjustable wake-up period: 250ms to 39 days

• 800nA quiescent current

• Low-leakage EN output capable of controlling DC/DC converter (LTC2956-1)

• High-voltage EN output capable of driving external P-channel MOSFET (LTC2956-2)

• Debounced push button status output

• Push button interrupt

• Adjustable power-off timer

• ±25kV ESD HBM on /PB input

• 12-pin 3mm x 3mm QFN & MSOP packages

USA list pricing information is for approximate budgeting purposes only; international pricing may vary based on regional tariffs, taxes, fees, and exchange rates.