LT1313

Obsolete

Dual PCMCIA VPP Driver/Regulator

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Overview

Digital Selection of 0V, V_CC, 12V or Hi-Z
Output Current Capability: 120mA
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
Output Capacitors: 1µF
Quiescent Current in Hi-Z or 0V Mode: 60µA
Independent VPP Valid Status Feedback Signals

The LT1313 is a member of the Analog Devices PCMCIA driver/regulator family. It provides 0V, 3.3V, 5V, 12V and Hi-Z regulated power to the VPP pins of two PCMCIA card slots from a single unregulated 13V to 20V supply. When used in conjunction with a PC Card Interface Controller, the LT1313 forms a complete minimum component-count interface for palmtop, pen-based and notebook computers. The two VPP output voltages are independently selected by four logic compatible digital inputs which interface directly with industry standard PC Card Interface Controllers.

Automatic 3.3V to 5V switching is provided by two independent comparators which continuously monitor each PC card V_cc supply voltage and automatically adjust the VPP output to match the associated V_cc pin voltage when the VPP = V_cc mode is selected.

Two open-collector VPP VALID outputs are provided to indicate when the VPP outputs are in regulation at 12V.

The LT1313 is available in 16-pin SO packaging.

Applications