LTC1177-12

LTC1177-5/LTC1177-12 Isolated MOSFET Drivers FEATURES s s s s DESCRIPTIO s s s s s s 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 The LTC®1177-5/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 the 18-pin PDIP or 28-pin SW package. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATI s s s s S Solid State Relay Isolated Solenoid Driver Isolated Motor Driver Isolated Lamp Driver TYPICAL APPLICATI Isolated High Side Switch 5V OR 12V 0V V+ = 40V f = 50Hz 1 18 VIN GN...