LTC2950-1/LTC2950-2

1

295012fb

Turn On Debounce

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

EN

2V/DIV

PB

10ms/DIV

2950 TA01b

Push Button On/Off

Controller

The LTC

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

button input with independently programmable ON and OFF

debounce times that control the toggling of an open drain

enable output. The part also contains a simple micropro-

cessor interface to allow for proper system housekeeping

prior to power down. Under system fault conditions, an

internal KILL timer ensures proper power down.

The LTC2950 operates over a wide 2.7V to 26V input

voltage range to accommodate a wide variety of input

power supplies. Very low quiescent current (6μA typical)

makes the LTC2950 ideally suited for battery powered

applications. Two versions of the part are available to ac-

commodate either positive or negative enable polarities.

The parts are available in either 8-lead 3mm

× 2mm DFN

or ThinSOT packages.

■

Portable Instrumentation Meters

■

Blade Servers

■

Portable Customer Service PDA

■

Desktop and Notebook Computers

■

Adjustable Push Button On/Off Timers

■

Low Supply Current: 6μA

■

Wide Operating Voltage Range: 2.7V to 26V

■

EN Output (LTC2950-1) Allows DC/DC Converter

Control

■

EN Output (LTC2950-2) Allows Circuit Breaker

Control

■

Simple Interface Allows Graceful μP Shut Down

■

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

SHDN

EN

INT

KILL

INT

KILL

LTC2950-1

ONT

OFFT

DC/DC

BUCK

μP/μC

3V – 26V

*OPTIONAL

R1

10k

2950 TA01

0.033μF

0.033μF

PB

GND

L, LT, LTC and LTM 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.