LTC2953

1

2953f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Push Button

On/Off Controller

with Voltage Monitoring

manages system power via a push button interface. An

enable output toggles system power while an interrupt

output provides debounced push button status. The inter-

rupt output can be used in menu driven applications to

request a system power down.

The LTC2953 also features input and output power sup-

ply monitors. An uncommitted power fail comparator

provides real time input monitor information, while a

de-glitched under voltage lockout comparator gracefully

initiates a system power down. The under voltage lockout

comparator prevents the system from powering from a

low power supply.

The adjustable supply monitor input is compared against

an accurate internal 0.5V reference. The reset output

remains low until the supply monitor input has been in

compliance for 200ms.

The LTC2953 operates over a wide 2.7V to 27V input

voltage range and draws only 14μA of current. Two ver-

sions of the part accommodate either positive or negative

enable polarities.

Push Button On/Off Control with Interrupt

Converter Control

⎯E⎯N Output (LTC2953-2) Allows Circuit

Breaker Control

and Power Down

⎯P⎯B Input

× 3mm DFN

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

All other trademarks are the property of their respective owners.

TURN ON PULSE

TURNS ON

STAYS ON

INTERRUPT

INTERRUPT

TURNS OFF

SHORT

INTERRUPT PULSE

LONG

TURN OFF PULSE

PB

INT

2954 TD01b

EN

ON/OFF

EN

VM

RST

PFO

INT

KILL

RST

GPIO

INT

KILL

LTC2953-1

PDT

DC/DC

SHDN

SYSTEM

LOGIC

8.4V

3.3V

499k

100k

100k

100k

100k

100k

2953 TA01

1

μF

PB

GND

PFI

UVLO

2150k

23.2k

196k

+