Features

• OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
• UL Recognized ® File E151738 to UL1577
• No Secondary Power Supply
• Drives Any Logic Level FET
• Low Input Current: 1mA Typ (LTC1177-5), 2.5mA Typ (LTC1177-12)
• Turns On in 1ms Typ and Turns Off in 1ms Typ
• 2500VRMS of Isolation Voltage
• Isolates Input from High Voltage Transients at Load
• Clean, Bounce-Free Switching
• Current Limit
• Small Outline Package

Typical Application

Description

OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.

The LTC1177-5/LTC1177-12 are isolated high side MOSFET drivers. When used with an external N-channel MOSFET, the LTC1177-5/LTC1177-12 form an isolated solid state switch for reliable bounce-free switching operation. The output does not require an auxiliary power supply to maintain an on-state condition.

Two lead frame capacitors are used to transfer energy from the input to drive the gate of the MOSFET and provide the necessary isolation. Unlike optoisolated FET drivers, the input current for the LTC1177-5 is only 1mA and 2.5mA for LTC1177-12. It also does not have the aging problems endemic to optocouplers.

Both devices provide 2500VRMS (1 minute) or 3000VRMS (1 second) of output-to-input isolation.

The LTC1177-5/LTC1177-12 are available in UL Recognized the 18-pin PDIP or 28-pin SW package.