Features

• Obsolete - Datasheet  For Information Purposes Only.  Contact Linear Technology for Potential Replacement
• Digital Selection of 0V, V_CC, 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
• 1µF Output Capacitor
• 30µA Quiescent Current in Hi-Z or 0V Mode
• VPP Valid Status Feedback Signal
• No VPP Overshoot
• 8-Pin SO Packaging

Typical Application

Description

Obsolete - Datasheet  For Information Purposes Only.  Contact Linear Technology for Potential Replacement

The LT1312 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 V_CC supply and automatically adjusts the regulated VPP output to match V_CC when the VPP = V_CC 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.