LT1312CS8

LT1312CS8 Datasheet

LT1312

Part	Datasheet
LT1312CS8	LT1312CS8 (pdf)

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OBSOLETE: FOR INFORMATION PURPOSES ONLY Contact Linear Technology for Potential Replacement I Digital Selection of 0V, VCC, 12V or Hi-Z I 120mA Output Current Capability I Internal Current Limiting and Thermal Shutdown I Automatic Switching from 3.3V to 5V I Powered from Unregulated 13V to 20V Supply I Logic Compatible with Standard PCMCIA Controllers I 1µF Output Capacitor I 30µA Quiescent Current in Hi-Z or 0V Mode I VPP Valid Status Feedback Signal I No VPP Overshoot I 8-Pin SO Packaging U APPLICATIONS I Notebook Computers I Palmtop Computers I Pen-Based Computers I Handi-Terminals I Bar-Code Readers I Flash Memory Programming LT1312 Single PCMCIA VPP Driver/Regulator The is a member of Linear Technology Corporation’s family of PCMCIA drivers/regulators. The LT1312 provides 0V, 3.3V, 5V, 12V and Hi-Z regulated power to the VPP pin of a PCMCIA card slot from a single unregulated 13V to 20V supply. When used in conjunction with a PC card interface controller, the LT1312 forms a complete minimum component-count interface for palmtop, pen-based and notebook computers. The VPP output voltage is selected by two logic compatible digital inputs which interface directly with industry standard PC card interface controllers. Automatic 3.3V to 5V switching is provided by an internal comparator which continuously monitors the PC card VCC supply and automatically adjusts the regulated VPP output to match VCC when the VPP = VCC mode is selected. An open-collector VPP VALID output is driven low when VPP is in regulation at 12V. The LT1312 is available in an 8-pin SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. Typical PCMCIA Single Slot VPP Driver 13V TO 20V PCMCIA CARD SLOT CONTROLLER VS EN0 VPPOUT EN1 LT1312 VALID SENSE VPP1 VPP2 PCMCIA CARD SLOT 3.3V OR 5V + COUT 1µF TANTALUM LT1312 TA1 LT1312 TRUTH TABLE X = DON’T CARE SENSE X 3.0V TO 3.6V 4.5V TO 5.5V VPPOUT 0V 12V 3.3V 5V Hi-Z VALID 1 0 1 Linear Technology PCMCIA Product Family DEVICE DESCRIPTION PACKAGE LT1312 SINGLE PCMCIA VPP DRIVER/REGULATOR 8-PIN SO LT1313 DUAL PCMCIA VPP DRIVER/REGULATOR 16-PIN SO* SINGLE PCMCIA SWITCH MATRIX 14-PIN SO LTC1315 DUAL PCMCIA SWITCH MATRIX 24-PIN SSOP LTC1470 PROTECTED VCC 5V/3.3V SWITCH MATRIX LTC1472 PROTECTED VCC AND VPP SWITCH MATRIX NARROW BODY 8-PIN SO 16-PIN SO LT1312

PDF Datasheet Preview

OBSOLETE:

FOR INFORMATION PURPOSES ONLY

Contact Linear Technology for Potential Replacement

I Digital Selection of 0V, VCC, 12V or Hi-Z I 120mA Output Current Capability I Internal Current Limiting and Thermal Shutdown I Automatic Switching from 3.3V to 5V I Powered from Unregulated 13V to 20V Supply I Logic Compatible with Standard PCMCIA Controllers I 1µF Output Capacitor I 30µA Quiescent Current in Hi-Z or 0V Mode I VPP Valid Status Feedback Signal I No VPP Overshoot I 8-Pin SO Packaging

U APPLICATIONS

I Notebook Computers I Palmtop Computers I Pen-Based Computers I Handi-Terminals I Bar-Code Readers I Flash Memory Programming

LT1312

Single PCMCIA VPP Driver/Regulator

The is a member of Linear Technology Corporation’s family of PCMCIA drivers/regulators. The LT1312 provides 0V, 3.3V, 5V, 12V and Hi-Z regulated power to the VPP pin of a PCMCIA card slot from a single unregulated 13V to 20V supply. When used in conjunction with a PC card interface controller, the LT1312 forms a complete minimum component-count interface for palmtop, pen-based and notebook computers. The VPP output voltage is selected by two logic compatible digital inputs which interface directly with industry standard PC card interface controllers.

Automatic 3.3V to 5V switching is provided by an internal comparator which continuously monitors the PC card VCC supply and automatically adjusts the regulated VPP output to match VCC when the VPP = VCC mode is selected. An open-collector VPP VALID output is driven low when VPP is in regulation at 12V.

The LT1312 is available in an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.

Typical PCMCIA Single Slot VPP Driver
13V TO 20V

PCMCIA CARD SLOT CONTROLLER

VS EN0 VPPOUT EN1 LT1312 VALID SENSE

VPP1

VPP2 PCMCIA

CARD SLOT
3.3V OR 5V
+ COUT
1µF TANTALUM

LT1312 TA1

LT1312 TRUTH TABLE

X = DON’T CARE

SENSE X
3.0V TO 3.6V 4.5V TO 5.5V

VPPOUT 0V 12V 3.3V 5V Hi-Z

VALID 1 0 1

Linear Technology PCMCIA Product Family

DEVICE DESCRIPTION

PACKAGE

LT1312 SINGLE PCMCIA VPP DRIVER/REGULATOR 8-PIN SO

LT1313 DUAL PCMCIA VPP DRIVER/REGULATOR 16-PIN SO*

SINGLE PCMCIA SWITCH MATRIX
14-PIN SO

LTC1315 DUAL PCMCIA SWITCH MATRIX
24-PIN SSOP

LTC1470 PROTECTED VCC 5V/3.3V SWITCH MATRIX LTC1472 PROTECTED VCC AND VPP SWITCH MATRIX *NARROW BODY
8-PIN SO 16-PIN SO*

LT1312

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LT1312CS8 Datasheet file may be downloaded here without warranties.

Datasheet ID: LT1312CS8 645744