LTC2955CDDB-2 Integrated Circuit Chip Micropower Pushbutton On/Off Controller 10-Lead DFN IC

The LTC2955CDDB-2 is a micropower pushbutton on/off controller that manages system power by generating a clean enable output from the supply monitor input and the debounced pushbutton input. An interrupt output notifies the system when the button is pressed or the supply is low.

The supply input covers 1.5 V to 36 V, so the same part works on single cell battery rails, 3.3 V, 5 V, 12 V and 24 V inputs. Supply current is only 1.2 microamps typical, which keeps standby drain negligible in battery powered equipment.

The pushbutton input tolerates plus or minus 36 V and survives ESD strikes to plus or minus 25 kV on the human body model without latch-up. If the button is held longer than the configurable turn-off duration the system power is forced off, and the KILL input lets the system request a graceful shutdown when it is ready.

The enable output is a high voltage EN pin designed to drive the gate of an external P-channel MOSFET, so the controller can switch the main supply rail itself rather than only the converter shutdown pin.

The LTC2955CDDB-2 is the commercial grade part in the 10-Lead (3mm x 2mm) Plastic DFN package, specified from 0 to 70 degrees C. Automatic turn-on is triggered through the voltage monitor input, and separate versions are available for positive and negative enable polarity. The part is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.

• Automatic turn-on via voltage monitor input
• Wide 1.5 V to 36 V input supply range
• Low 1.2 microamp supply current
• Plus or minus 25 kV ESD HBM on the pushbutton input
• Plus or minus 36 V wide input voltage on the pushbutton input
• High voltage EN output drives external P-channel MOSFET
• Simple interface allows graceful microprocessor shutdown
• Adjustable turn-off timer
• Interrupt output for button and supply events
• Debounced pushbutton input
• 10-Lead (3mm x 2mm) Plastic DFN package
• RoHS compliant, lead free

• Desktop and notebook computers
• GPS devices
• Portable instruments
• Automotive electronics
• Battery powered handheld equipment
• Industrial control panels

Typical use is a handheld instrument where a front panel button must power the rail up and down cleanly while standby current stays in the microamp range.

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