LTC1177-5 Datasheet, PDF (1/8 Pages) Linear Technology – Isolated MOSFET Drivers

LTC1177-5/LTC1177-12
Isolated MOSFET Drivers
FEATURES
s _{UL Recognized ®}
File E151738 to UL1577
s _{No Secondary Power Supply}
s _{Drives Any Logic Level FET}
s _{Low Input Current: 1mA Typ (LTC1177-5),}
2.5mA Typ (LTC1177-12)
s _{Turns On in 1ms Typ and Turns Off in 1ms Typ}
s _{2500VRMS of Isolation Voltage}
s _{Isolates Input from High Voltage Transients at Load}
s _{Clean, Bounce-Free Switching}
s _{Current Limit}
s _{Small Outline Package}
APPLICATI S
s _{Solid State Relay}
s _{Isolated Solenoid Driver}
s _{Isolated Motor Driver}
s _{Isolated Lamp Driver}
DESCRIPTIO
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 op-
eration. 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 2500V_RMS (1 minute) or 3000V_RMS
(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.
TYPICAL APPLICATI
Isolated High Side Switch
5V OR 12V
0V
f = 50Hz
1
V_IN
18
GND1
LTC1177-5
LTC1177-12
V⁺ = 40V
ISOLATION BARRIER
V_OUT
+ _47µF
50V
7 _NC
8 _NC
12
NC
11
GND2
MTD3055EL
9
OUT
10
SENSE
V_IN
R_OUT
50Ω
V_OUT
1177 TA01
Input vs Output
1177 TA02
1