The LTC1623 SMBus switch controller is a slave device that controls two high-side N-channel MOSFETs on either the SMBus or the I²C bus. The LTC1623 operates with an input voltage from 2.7V to 5.5V with a low standby current of 14µA (at 3.3V). In accordance with the SMBus specification, the LTC1623 maintains the 0.6V V_IL and 1.4V V_IH input thresholds throughout the supply voltage range.

Using the 2-wire interface, CLK and DATA, the LTC1623 monitors the bus for a start condition (DATA going from high to low while CLK is high). Once detected, the LTC1623 compares its address with the first (address) byte sent over the bus from the master. If matched, the LTC1623 will execute the second (command) byte from the master and independently control the built-in charge pumps to drive two external switches.

The LTC1623 has two three-state programmable address pins, thus allowing eight different addresses and a total of sixteen available switches on the same bus.

Applications

• Computer Peripheral Control
• Laptop Computer Power Plane Switching
• Portable Equipment Power Control
• Industrial Control Systems
• Handheld Equipment

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.