LTC2951

1

2951f

EN

2V/DIV

PB

25ms/DIV

2951 TA01b

128ms

Push Button On/Off

Controller

push button ON/OFF controller. The part contains a push

button input which controls the toggling of an open drain

enable output. The push button 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 power

down. Under system fault conditions, an adjustable ⎯K⎯I⎯L⎯L

timeout delay ensures proper power down.

The LTC2951 operates over a 2.7V to 26V 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.

■

Portable Instrumentation Meters

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Blade Servers

■

Portable Customer Service PDA

■

Desktop and Notebook Computers

■

Adjustable Push Button Debounce and Delay

Timers

■

Low Supply Current: 6µA

■

Wide Operating Voltage Range: 2.7V to 26V

■

EN Output (LTC2951-1) Allows DC/DC Converter

Control

■

⎯E⎯N Output (LTC2951-2) Allows Circuit Breaker

Control

■

Simple Interface Allows Graceful µP Shut Down

■

High Input Voltage ⎯P⎯B Pin with Internal Pull Up

Resistor

■

±10kV ESD HBM on ⎯P⎯B Input

■

Accurate 0.6V Threshold on ⎯K⎯I⎯L⎯L Comparator Input

■

8-Pin 3mm × 2mm DFN and ThinSOT

SHDN

EN

INT

KILL

INT

KILL

LTC2951-1

KILLT

OFFT

DC/DC

BUCK

µP/µC

3V – 26V

*OPTIONAL

R1

10k

2951 TA01

0.033

µF

0.033

µF

PB

GND

, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is

a trademark of Linear Technology Corporation. All other trademarks are the property of

their respective owners.

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Turn On Debounce