LT1312| Datasheet

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LT1312
OBSOLETE:

Single PCMCIA VPP Driver/Regulator

Contact Linear Technology for Potential Replacement

FOR INFORMATION PURPOSES ONLY

I I I I I I I I I I I

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

The LT 1312 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.

APPLICATIONS
I I I I I I

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

TYPICAL APPLICATION
Typical PCMCIA Single Slot VPP Driver
13V TO 20V VS PCMCIA CARD SLOT CONTROLLER EN0 VPPOUT VPP1 VPP2 PCMCIA CARD SLOT VCC 3.3V OR 5V COUT 1uF TANTALUM
LT1312 TA1

Linear Technology PCMCIA Product Family
DEVICE LT1312 LT1313

EN1 LT1312 VALID SENSE GND

DESCRIPTION SINGLE PCMCIA VPP DRIVER/REGULATOR DUAL PCMCIA VPP DRIVER/REGULATOR DUAL PCMCIA SWITCH MATRIX PROTECTED VCC 5V/3.3V SWITCH MATRIX

+

LTC 1314 SINGLE PCMCIA SWITCH MATRIX LTC1315 LTC1470 LTC1472

LT1312 TRUTH TABLE EN0 EN1 0 0 1 0 0 1 0 1 1 1 X = DON'T CARE SENSE X X 3.0V TO 3.6V 4.5V TO 5.5V X VPPOUT 0V 12V 3.3V 5V Hi-Z VALID 1 0 1 1 1

PROTECTED VCC AND VPP SWITCH MATRIX 16-PIN SO*

*NARROW BODY

U

FEATURES

DESCRIPTION

U

U

PACKAGE 8-PIN SO 16-PIN SO* 14-PIN SO 24-PIN SSOP 8-PIN SO

1

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LT1312 DATASHEET