LTC1472 Просмотр технического описания (PDF) - Linear Technology

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LTC1472

Protected PCMCIA VCC and VPP Switching Matrix

Linear Technology 

LTC1472

Protected PCMCIA VCC and

VPP Switching Matrix

FEATURES

■ Both VCC and VPP Switching in a Single Package

■ Built-In Current Limit and Thermal Shutdown

■ 16-Pin (Narrow) SOIC Package

■ Inrush Current Limited (Drives 150µF Loads)

■ Continuous 12V Power Not Required

■ Extremely Low RDS(ON) NMOS Switches

■ Guaranteed 1A VCC Current and 120mA VPP Current

■ 1µA Quiescent Current in Standby

■ No External Components Required

■ Compatible with Industry Standard Controllers

■ Break-Before-Make Switching

■ Controlled Rise and Fall Times

U

APPLICATIO S

■ OpenCable Set Top Box

■ Notebook Computers

■ Palmtop Computers

■ Pen-Based Computers

■ Bar-Code Readers

DESCRIPTIO

The LTC®1472 switching matrix routes power to both the

VCC and VPP power supply pins of the PCMCIA compatible

card socket. The VCC output of the LTC1472 is switched

between three operating states: OFF, 3.3V, and 5V. The

VPP output is switched between four operating states: 0V,

VCC, 12V, and Hi-Z. The output voltages are selected by

two sets of digital inputs which are compatible with

industry standard PC Card controllers (see Truth Tables).

The VCC output of the LTC1472 can supply up to 1A of

current and the VPP output up to 120mA. Both switches

have built-in SafeSlotTM current limiting and thermal shut-

down to protect the card, socket and power supply against

accidental short-circuit conditions.

The LTC1472 is designed to conserve power by automati-

cally dropping to 1µA standby current when the two

outputs are switched OFF. A shutdown pin is provided

which holds the external 12V regulator in standby mode

except when required for VPP power.

The LTC1472 is available in 16-pin SO package.

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

SafeSlot is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

Protected PCMCIA VCC and VPP Card Driver

3.3V

0.1µF

5V

0.1µF

PCMCIA

CARD SLOT

CONTROLLER

3VIN

5VIN

VPPIN

SHDN

VPPOUT

LTC1472

VDD

VPP EN0

VPP EN1 VCC(IN)

VCC EN0 VCC(OUT)

VCC EN1

GND

12V

0.1µF

TO 12V REGULATOR

OV, VCC, 12V, Hi-Z

0.1µF

VPP1

VPP2

PCMCIA

CARD SLOT

OFF, 3.3V, 5V

VCC

VCC

+

10k

1µF

LTC1472-TA01

Linear Technology PCMCIA Product Family

DEVICE DESCRIPTION

LT®1312 Single PCMCIA VPP Driver/Regulator

LT1313 Dual PCMCIA VPP Driver/Regulator

LTC1314 Single PCMCIA Switch Matrix

LTC1315 Dual PCMCIA Switch Matrix

LTC1470 Protected VCC 5V/3.3V Switch Matrix

LTC1471 Dual Protected VCC 5V/3.3V Switch Matrix

LTC1472 Protected VCC and VPP Switch Matrix

*Narrow Body

PACKAGE

8-Pin SO

16-Pin SO*

14-Pin SO

24-Pin SSOP

8-Pin SO

16-Pin SO*

16-Pin SO*

1472fa

1

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