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LT1312CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1312CS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 12 page  1 LT1312 FEATURES DESCRIPTION Single PCMCIA VPP Driver/Regulator s Digital Selection of 0V, VCC, 12V or Hi-Z s 120mA Output Current Capability s Internal Current Limiting and Thermal Shutdown s Automatic Switching from 3.3V to 5V s Powered from Unregulated 13V to 20V Supply s Logic Compatible with Standard PCMCIA Controllers s 1 µF Output Capacitor s 30 µA Quiescent Current in Hi-Z or 0V Mode s VPP Valid Status Feedback Signal s No VPP Overshoot s 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 palm- top, 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 out- put 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. APPLICATIONS s Notebook Computers s Palmtop Computers s Pen-Based Computers s Handi-Terminals s Bar-Code Readers s Flash Memory Programming VS 13V TO 20V 3.3V OR 5V EN0 COUT 1 µF TANTALUM VPPOUT VPP1 VPP2 PCMCIA CARD SLOT VCC LT1312 EN1 VALID SENSE GND LT1312 TA1 PCMCIA CARD SLOT CONTROLLER + TYPICAL APPLICATION Typical PCMCIA Single Slot VPP Driver LT1312 TRUTH TABLE EN0 EN1 SENSE VPPOUT VALID 00 X 0V 1 1 0 X 12V 0 0 1 3.0V TO 3.6V 3.3V 1 0 1 4.5V TO 5.5V 5V 1 1 1 X Hi-Z 1 X = DON’T CARE 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* LTC ®1314 SINGLE PCMCIA SWITCH MATRIX 14-PIN SO LTC1315 DUAL PCMCIA SWITCH MATRIX 24-PIN SSOP LTC1470 PROTECTED VCC 5V/3.3V SWITCH MATRIX 8-PIN SO LTC1472 PROTECTED VCC AND VPP SWITCH MATRIX 16-PIN SO* *NARROW BODY , LTC and LT are registered trademarks of Linear Technology Corporation. |
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