DC1090A

Demonstration circuit 1090A features the LTC2954-2, a push button ON/OFF controller that manages system power via a push button interface. An enable output toggles system power while an interrupt output provides a debounced push button status. The interrupt output can be used in menu driven applications to request a system power down. A power kill input allows a microprocessor or system to reset the enable output, effectively powering down the system. Independently adjustable on and off timers allow dependable push button control of the enable output and resistance to accidental toggling of system power. The LTC2954 operates over a wide 2.7V to 26.4V input voltage range to accommodate a wide variety of input power supplies. Very low quiescent current (6µA typical) makes the LTC2954 ideally suited for battery powered applications. Two versions of the part are available to accommodate either positive or negative enable polarities. The inversion of /EN of LTC2954-2 is found in LTC2954-1.

• Output voltage of VIN - VDS (VOUT, /PB turn on), 2.6V ± 2% (V2P6V, /PB turn on)

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