LTC2950-1/LTC2950-2 Pushbutton On/Off Controller FeaTuresDescripTion n Adjustable Pushbutton On/Off Timers The LTC®2950 is a micropower, wide input voltage range, n Low Supply Current: 6µA pushbutton ON/OFF controller. The part contains a pushbut- n Wide Operating Voltage Range: 2.7V to 26.4V ton input with independently programmable ON and OFF n EN Output (LTC2950-1) Allows DC/DC Converter debounce times that control the toggling of an open drain Control enable output. The part also contains a simple micropro- n EN Output (LTC2950-2) Allows Circuit Breaker cessor interface to allow for proper system housekeeping Control prior to power down. Under system fault conditions, an n Simple Interface Allows Graceful µP Shut Down internal KILL timer ensures proper power down. n High Input Voltage PB Pin with Internal Pull Up The LTC2950 operates over a wide 2.7V to 26.4V input Resistor voltage range to accommodate a wide variety of input n ±10kV ESD HBM on PB Input power supplies. Very low quiescent current (6µA typical) n Accurate 0.6V Threshold on KILL Comparator Input makes the LTC2950 ideally suited for battery powered n 8-Pin 3mm × 2mm DFN and ThinSOT™ Packages applications. Two versions of the part are available to ac- commodate either positive or negative enable polarities. applicaTions The parts are available in either 8-lead 3mm × 2mm DFN n or ThinSOT packages. Portable Instrumentation Meters L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Blade Servers ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks n are the property of their respective owners. Portable Customer Service PDA n Desktop and Notebook Computers Typical applicaTion V Turn On Debounce IN 2.7V TO 26.4V VIN VOUT DC/DC BUCK SHDN** EN R1 2V/DIV VIN EN 10k LTC2950-1 PB INT INT µP/µC PB KILL KILL GND ONT OFFT 2950 TA01 10ms/DIV 2950 TA01b CONT* COFFT* 0.033µF 0.033µF *OPTIONAL **SHDN INTERNALLY PULLED UP BY DC/DC 295012fd 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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