LTC1470CS8 LTC1470 - Single and Dual PCMCIA Protected 3.3V/5V VCC Switches

Features and Benefits

• 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

Product details

The LTC1470 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.

The LTC1470 inputs are compatible with industry standard PCMCIA controllers. A built-in XOR ensures that both switches are never on at the same time. This function also makes the LTC1470 compatible with both active-low and active-high controllers (see Applications Information section). The switch rise times are controlled to eliminate power supply glitching.

The LTC1470 features built-in SafeSlot™ current limit and thermal shutdown. The output is limited to 1A during short circuit to ground but 2A of peak operating current is allowed.

The LTC1471 is a dual version of the LTC1470 and is available in a 16-pin SO package.

Applications

• Notebook Computers

• Palmtop Computers

• Pen-Based Computers

• Handi-Terminals

• PC Card Reader/Writers

• 3.3V/5V Power Supply Switch