LTC1177

Obsolete

Isolated MOSFET Drivers

Data Sheet Product Selection Table

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Overview

OBSOLETE: For Information Purposes Only. Contact Analog Devices 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

2500V_RMS of Isolation Voltage
Isolates Input from High Voltage Transients at Load
Clean, Bounce-Free Switching
Current Limit
Small Outline Package

OBSOLETE: For Information Purposes Only. Contact Analog Devices 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.

Applications