This design note introduces the LTC2953, a pushbutton on/off controller with failsafe voltage monitoring that can be used to control DC/DC converters, power switches, or other circuits. The device can be controlled by a short or long press of the pushbutton, and it also features fault protection that can automatically turn off the power in the event of a system failure.
Design Note 427 introduces the LTC2953, a low-power IC designed to interface with noisy mechanical on/off switches. It provides a complete solution for system power turn-on and turn-off by cleaning up pushbutton chatter and ensuring an orderly sequence of events independent of unresponsive system logic.
The device asserts the enable output 32ms after detecting the end of pushbutton chatter.
The system must set the KILL input high within 512ms of enabling power.
If the supply glitches for longer than 32ms, the LTC2953 will issue an interrupt signal.