LTC2953IDD-2-TRPBF 查看數據表（PDF） - Linear Technology

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LTC2953IDD-2-TRPBF

Push Button On/Off Controller with Voltage Monitoring

Linear Technology 

FEATURES

■ Wide Operating Voltage Range: 2.7V to 27V

■ Push Button Control of System Power

■ Low Supply Current: 14μA

■ Power Fail Comparator Generates Warning

■ UVLO Comparator Gracefully Latches Power Off

■ Adjustable Supply Monitor with 200ms Reset

■ Adjustable Power Down Timer

■ Low Leakage EN Output (LTC2953-1) Allows DC/DC

Converter Control

■ High Voltage ⎯E⎯N Output (LTC2953-2) Allows Circuit

Breaker Control

■ Simple Interface Allows Orderly System Power Up

and Power Down

■ ±1.5% Threshold Tolerances

■ ±10kV ESD HBM on ⎯P⎯B Input

■ 12-Pin 3mm × 3mm DFN

APPLICATIONS

■ Push Button Power Path Control

■ Battery Power Supervisor

■ Portable Instrumentation, PDA

■ Blade Servers

■ Desktop and Notebook Computers

LTC2953

Push Button

On/Off Controller

with Voltage Monitoring

DESCRIPTION

The LTC®2953 is a push button On/Off controller that

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.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

8.4V 2150k

UVLO

VIN

EN

VIN

VOUT

100k

DC/DC

3.3V

SHDN

23.2k

196k

ON/OFF

LTC2953-1

PFI

VM

499k 100k

100k

100k

100k

RST

PFO

INT

PB

KILL

RST

GPIO

INT SYSTEM

KILL LOGIC

GND

PDT

1μF

2953 TA01

tPDT = 6.4 SECONDS

Push Button On/Off Control with Interrupt

TURN ON PULSE

SHORT

INTERRUPT PULSE

PB

LONG

TURN OFF PULSE

EN

TURNS ON

STAYS ON

TURNS OFF

INT

INTERRUPT

INTERRUPT

2954 TD01b

2953f

1

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