LTC2951-1
LTC2951-2

RECOMMENDED FOR NEW DESIGNS

Push Button On/Off Controller

Part Models: 16
1ku List Price: Starting From $2.19

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Overview

Adjustable Pushbutton Debounce and Delay Timers
Low Supply Current: 6μA
Wide Operating Voltage Range: 2.7V to 26.4V
EN Output (LTC2951-1) Allows DC/DC Converter Control
EN Output (LTC2951-2) Allows Circuit Breaker Control
Simple Interface Allows Graceful μP Shutdown
High Input Voltage PB Pin with Internal Pull-Up Resistor
±10kV ESD HBM on PB Input
Accurate 0.6V Threshold on KILL Comparator Input
8-Pin 3mm × 2mm DFN and ThinSOT^™ Packages

The LTC2951 is a micropower, wide input voltage range pushbutton ON/OFF controller. The part contains a pushbutton input which controls the toggling of an open-drain enable output. The pushbutton turn OFF debounce time is externally programmable, while the turn ON debounce time is fixed at 128ms. A simple microprocessor interface allows for proper system housekeeping prior to powerdown. Under system fault conditions, an adjustable KILL timeout delay ensures proper power-down.

The LTC2951 operates over a 2.7V to 26.4V input voltage range to accommodate a variety of input power supplies. Very low quiescent current (6μA typical) makes the LTC2951 ideally suited for battery powered applications. Two versions of the part are available to accommodate either positive or negative enable polarities. The parts are available in 8-pin 3mm × 2mm DFN and ThinSOT packages.

Applications

Portable Instrumentation Meters
Blade Servers
Portable Customer Service PDA
Desktop and Notebook Computers

Part Models: 16
1ku List Price: Starting From $2.19

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC2951CDDB-1#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CDDB-1#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CDDB-2#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CDDB-2#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CTS8-1#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CTS8-1#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CTS8-2#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951CTS8-2#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951IDDB-1#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951IDDB-1#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951IDDB-2#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951IDDB-2#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951ITS8-1#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951ITS8-1#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951ITS8-2#TRMPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2951ITS8-2#TRPBF	8-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6991	PRODUCTION	TimerBlox: Resettable, Low Frequency Oscillator

Tools & Simulations

LTspice 1

LT3010 - LDO Linear Regulators, LTC2951 - Power Monitor, Control, and Protection

Models for the following parts are available in LTspice:

LTC2951-1
LTC2951-2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC2950-2/LTC2951-2 Pushbutton On/Off Controller 2.7V ≤ VIN ≤ 26.4V

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Product Details

Demonstration Circuits 826C-A and 826C-B feature the LTC2950-2 and the LTC2951-2 respectively, which are low power, wide input voltage range, Push Button On/Off Controllers. A push button switch shorts the /PB pin to ground which in turn sets the /EN pin low. Shorting /PB to ground a second time subsequently resets the /EN pin high. The /EN pin is used to connect to a DC/DC converter shutdown to control the turn on and off of the circuit, simulated with a green LED on the DC826C-A/DC826C-B.