LTC1470 Просмотр технического описания (PDF) - Linear Technology

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LTC1470

Single and Dual PCMCIA Protected 3.3V/5V VCC Switches

Linear Technology 

FEATURES

■ Single 3.3V/5V Switch in 8-Pin SO Package

■ Dual 3.3V/5V Switch in 16-Pin SO Package

■ Built-In Current Limit and Thermal Shutdown

■ Built-In Charge Pumps (No 12V Required)

■ Extremely Low RDS(ON) MOSFET Switches

■ Output Current Capability: 1A

■ Inrush Current Limited (Drives 150µF Loads)

■ Quiescent Current in Standby: 1µA

■ No Parasitic Body Diodes

■ Built-In XOR Function Eliminates “Glue” Logic

■ Break-Before-Make Switching

■ Controlled Rise and Fall Times

■ Available in 8-Pin and 16-Pin SO Packages

U

APPLICATIO S

■ Set Top Box/Open Cable

■ Notebook Computers

■ Palmtop Computers

■ Pen-Based Computers

■ Handi-Terminals

■ 3.3V/5V Power Supply Switch

LTC1470/LTC1471

Single and Dual

PCMCIA Protected

3.3V/5V VCC Switches

DESCRIPTIO

The LTC®1470 switches the VCC pins of a Personal Com-

puter Memory Card International Association (PCMCIA)

card slot between three operating states: OFF, 3.3V and

5V. Two low RDS(ON) N-channel power MOSFETs are

driven by a built-in charge pump which generates a

voltage higher than the supply voltage to fully enhance

each switch when selected by the input control logic.

The LTC1470 inputs are compatible with industry stan-

dard PCMCIA controllers. A built-in XOR ensures that both

switches are never on at the same time. This function also

makes the LTC1470 compatible with both active-low and

active-high controllers (see Applications Information sec-

tion). The switch rise times are controlled to eliminate

power supply glitching.

The LTC1470 features built-in SafeSlotTM current limit and

thermal shutdown. The output is limited to 1A during short

circuit to ground but 2A of peak operating current is

allowed.

The LTC1471 is a dual version of the LTC1470 and is

available in a 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

Dual Slot PCMCIA 3.3V/5V VCC Switch

5V

0.1µF

PCMCIA

CARD SLOT

CONTROLLER

5VIN 3VIN

AOUT

LTC1471

3.3V

0.1µF

VCC

(Hi-Z/3.3V/5V) VCC

+

1µF 10k

PCMCIA

CARD SLOT

AEN1

AEN0

BEN1

BOUT

BEN0

GND

VCC

(Hi-Z/3.3V/5V) VCC

+

1µF 10k

PCMCIA

CARD SLOT

1470/71 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 Single Protected VCC 3.3V/5V Switch Matrix

LTC1471 Dual Protected VCC 3.3V/5V 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*

14701fa

1

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