DESCRIPTION

The LTC®1470 switches the VCC pins of a Personal Computer Memory Card International Association (PCMCIA) card slot between three operating states: OFF, 3.3V and 5V. Two low RDS(ON) N-channel power MOSFETs are driven by a built-in charge pump which generates a voltage higher than the supply voltage to fully enhance each switch when selected by the input control logic.

FEATURES

■ Single 3.3V/5V Switch in 8-Pin SO Package
■ Dual 3.3V/5V Switch in 16-Pin SO Package
■ Built-In Current Limit and Thermal Shutdown
■ Built-In Charge Pumps (No 12V Required)
■ Extremely Low RDS(ON) MOSFET Switches
■ Output Current Capability: 1A
■ Inrush Current Limited (Drives 150µF Loads)
■ Quiescent Current in Standby: 1µA
■ No Parasitic Body Diodes
■ Built-In XOR Function Eliminates “Glue” Logic
■ Break-Before-Make Switching
■ Controlled Rise and Fall Times
■ Available in 8-Pin and 16-Pin SO Packages

APPLICATIONS

■ Set Top Box/Open Cable
■ Notebook Computers
■ Palmtop Computers
■ Pen-Based Computers
■ Handi-Terminals
■ 3.3V/5V Power Supply Switch