LTC1177-5/LTC1177-12
FOR INFORMATION PURPOSES ONLY
OBSOLETE:
Isolated MOSFET Drivers
DESCRIPTIO
Contact Linear Technology for Potential Replacement
I
I
I
I
I
I
I
I
I
I
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
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.
I
I
I
I
Solid State Relay
Isolated Solenoid Driver
Isolated Motor Driver
Isolated Lamp Driver
Isolated High Side Switch
5V OR 12V
0V
V
+
= 40V
f = 50Hz
1
V
IN
GND1
LTC1177-5
LTC1177-12
ISOLATION BARRIER
7
8
9
NC
NC
OUT
NC
GND2
SENSE
12
11
10
V
IN
V
OUT
+
47µF
50V
MTD3055EL
R
OUT
50Ω
1177 TA01
UO
TYPICAL APPLICATI
UO
APPLICATI
S
18
V
OUT
1177 TA02
U
Input vs Output
FEATURES
1
LTC1177-5/LTC1177-12
ABSOLUTE
AXI U
RATI GS
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Input Voltages
V
IN
(LTC1177-5) ....................... 6V to (GND1 – 0.3V)
V
IN
(LTC1177-12) ................ 13.2V to (GND1 – 0.3V)
Sense (LTC1177-5) ................... 6V to (GND2 – 0.3V)
Sense (LTC1177-12) .............. 12V to (GND2 – 0.3V)
Output Voltages .......................... 12V to (GND2 – 0.3V)
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
V
IN
1
ISOLATION
BARRIER
18 GND1
LTC1177CN-5
LTC1177CN-12
LTC1177IN-5
LTC1177IN-12
NC
NC
OUT
7
8
9
12 NC
11 GND2
10 SENSE
NC 11
NC 12
OUT 13
NC 14
18 NC
17 GND2
16 SENSE
15 NC
N PACKAGE
18-LEAD PDIP ISOLATION BARRIER
T
JMAX
= 125°C,
θ
JA
= 110°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OUT
PARAMETER
Output Voltage (Refer to GND2)
V
IN
= 5V, T
A
= 25°C, unless otherwise noted.
MIN
q
q
q
q
q
q
q
q
q
q
CONDITIONS
C
OUT
= 1000pF, No Load (N Pkg)
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (N Pkg)
C
OUT
= 1000pF, No Load (SW Pkg)
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (SW Pkg)
C
IN
= 1000pF
R
SENSE
= 1Ω (LTC1177C-5)
R
SENSE
= 1Ω (LTC1177I-5)
C
OUT
= 1000pF, No Load (LTC1177C-5)
C
OUT
= 1000pF, No Load (LTC1177I-5)
C
OUT
= 1000pF, No Load
1 Minute (Note 1)
1 Second
V
OUT
< 1.5, C
OUT
= 1000pF
I
IN
I
LIM
t
ON
t
OFF
V
ISO
t
CM
Input Current
Current Limit
Turn-On Time
Turn-Off Time
Isolation Voltage
Common Mode Slew Rate
2
U
U
W
W W
U
W
TOP VIEW
NC
V
IN
NC
NC
1
2
3
4
ISOLATION
BARRIER
28 NC
27 GND1
26 NC
25 NC
ORDER PART
NUMBER
LTC1177CSW-5
LTC1177CSW-12
LTC1177ISW-5
LTC1177ISW-12
SW PACKAGE
28-LEAD PLASTIC SO WIDE
ISOLATION BARRIER
T
JMAX
= 125°C,
θ
JA
= 125°C/ W
LTC1177-5
TYP
7.5
6.5
8.0
7.0
1.0
620
620
1.0
1.0
1.0
MAX
10
10
10
10
1.5
800
900
4.0
4.5
1.8
UNITS
V
V
V
V
mA
mA
mA
ms
ms
ms
V
RMS
V
RMS
6.5
5.5
7.0
6.0
400
350
2500
3000
1000
V/µs
LTC1177-5/LTC1177-12
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OUT
PARAMETER
Output Voltage (Refer to GND2)
CONDITIONS
V
IN
= 12V, T
A
= 25°C unless otherwise noted.
LTC1177-12
MIN
TYP
MAX
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
UNITS
V
V
V
V
V
V
V
mA
mA
mA
mA
ms
ms
ms
ms
ms
ms
V
RMS
V
RMS
C
OUT
= 1000pF, No Load (LTC1177C-12, N Pkg)
C
OUT
= 1000pF, No Load (LTC1177C-12, SW Pkg)
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, N Pkg)
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, SW Pkg)
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177I-12, SW Pkg)
C
IN
= 1000pF (LTC1177C-12)
C
IN
= 1000pF (LTC1177I-12)
R
SENSE
= 1Ω (LTC1177C-12)
R
SENSE
= 1Ω (LTC1177I-12)
C
OUT
= 1000pF, No Load (LTC1177C-12)
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
C
OUT
= 1000pF, No Load (LTC1177C-12)
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
1 Minute (Note 1)
1 Second
V
OUT
< 1.5V, C
OUT
= 1000pF
4.65
5.00
4.40
4.60
4.50
4.75
4.50
5.2
5.7
4.9
5.3
5.2
5.7
5.3
2.5
2.5
8
8
7
7
8
8
7
3.0
3.4
800
900
2.5
2.5
1.2
1.5
I
IN
I
LIM
t
ON
Input Current
Current Limit
Turn-On Time
400
350
620
620
1.0
1.0
1.0
1.0
1.0
1.0
t
OFF
Turn-Off Time
V
ISO
TCM
Isolation Voltage
Common Mode Slew Rate
2500
3000
1000
Note 1:
Value derived from 1 second test.
V/µs
The
q
denotes specifications which apply over the full operating
temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1177-5
Turn-Off Time to V
OUT
= 1V
vs Temperature
1.8
1.6
1.4
V
IN
= 5V
C
OUT
= 1000pF
1.8
1.6
1.4
V
IN
= 5V
C
OUT
= 1000pF
1.2
1.0
0.8
N18, SW28
0.6
0.4
0.2
0
–55 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1177-5 G01
1.2
1.0
N18
0.8
0.6
0.4
0.2
0
–55 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1177-5 G02
OUTPUT CURRENT (µA)
TURN-OFF TIME (ms)
TURN-ON TIME (ms)
U W
LTC1177-5
Turn-On Time to V
OUT
= 4.5V
vs Temperature
18
16
14
12
10
8
6
LTC1177-5
Output Current vs Output Voltage
T
A
= 25°C
V
IN
= 5V
SW28
SW28
N18
4
2
0
0
1
2
4
3
5
6
OUTPUT VOLTAGE (V)
7
8
1177-5 G03
3
LTC1177-5/LTC1177-12
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1177-5
Output Voltage vs Temperature
9
SW28
8
INPUT CURRENT (mA)
7
OUTPUT VOLTAGE (V)
N18
OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
–55 –25
V
IN
= 5V
0
25 50 75 100 125 150
TEMPERATURE (°C)
1177-5 G04
LTC1177-5
Input Current vs Input Voltage
1.8
T
A
= 25°C
1.6
1.1
INPUT CURRENT (mA)
1.4
TURN-OFF TIME (ms)
1.2
1.0
0.8
0.6
0.4
N18
SW28
1.0
0.9
SW28
0.8
N18
0.7
TURN-ON TIME (ms)
0.2
0
0
1
2
4
3
5
6
INPUT VOLTAGE (V)
7
8
0.6
–55 –25
50
25
75
0
TEMPERATURE (°C)
100
125
0.4
–55 –25
50
25
75
0
TEMPERATURE (°C)
100
125
LTC1177-12
Turn-On Time to V
OUT
= 4.5V
vs Output Capacitance
1.6
1.4
TURN-ON TIME (ms)
T
A
= 25°C
V
IN
= 12V
N18
TURN-OFF TIME (ms)
1.2
1.0
0.8
0.6
0.4
0.2
500
SW28
OUTPUT CURRENT (µA)
1000
1500
OUTPUT CAPACITANCE (pF)
4
U W
1177-5 G07
1177-12-G10
LTC1177-5
Input Current vs Temperature
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–55 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1177-5 G05
LTC1177-5
Output Voltage vs Input Voltage
9
8
SW28
7
N18
6
5
4
3
2
1
0
0
1
2
4
3
5
6
INPUT VOLTAGE (V)
7
8
T
A
= 25°C
V
IN
= 5V
N18, SW28
1177-5 G06
LTC1177-12 Turn-Off Time to
V
OUT
= 1V vs Temperature
1.2
V
IN
= 12V
C
OUT
= 1000pF
1.6
1.4
1.2
LTC1177-12 Turn-On Time to
V
OUT
= 4.5V vs Temperature
V
IN
= 12V
C
OUT
= 1000pF
N18
1.0
SW28
0.8
0.6
1177-12 G08
1177-12 G09
LTC1177-12
Turn-Off Time to V
OUT
= 1V
vs Output Capacitance
1.1
T
A
= 25°C
N18
1.0
SW28
LTC1177-12
Output Current vs Output Voltage
14
12
10
8
SW28
6
N18
4
2
T
A
= 25°C
V
IN
= 12V
NO LOAD
0.9
2000
0.8
500
0
1500
1000
OUTPUT CAPACITANCE (pF)
2000
1177-12 G11
0
1
4
3
2
OUTPUT VOLTAGE (V)
5
1177-12 G12
LTC1177-5/LTC1177-12
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1177-12
Output Voltage vs Temperature
6.4
6.2
OUTPUT VOLTAGE (V)
6.0
5.8
N18
5.6
5.4
5.2
5.0
–55 –25
V
IN
= 12V
NO LOAD
SW28
INPUT CURRENT (mA)
2.6
2.4
2.2
SW28
2.0
1.8
1.6
–55 –25
N18
3.0
2.8
V
IN
= 12V
NO LOAD
LTC1177-12
Output Voltage vs Input Voltage
8
T
A
= 25°C
7
SW28
6
N18
5
INPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
3.0
3.4
4
3
9
10
11
12
13
INPUT VOLTAGE (V)
14
15
PIN FUNCTIONS
V
IN
:
Voltage Input, 5.25V
≥
V
IN
≥
4.75V (LTC1177-5) and
12.6V
≥
V
IN
≥
11.4V (LTC1177-12). Connect a 0.01µF
capacitor between V
IN
and GND1 when the source imped-
ance is high or the V
IN
connection is long.
OUT:
Output Voltage. The output voltage level is 8V (typ)
for SW package and 7.5V (typ) for N package (LTC1177-
5) with 5V at V
IN
pin; 5.7V (typ) for SW package and 5.2V
(typ) for N package (LTC1177-12) with 12V at V
IN
pin. This
pin is to drive the gate of the external N-channel MOSFET.
SENSE:
Current Limit Sense Input. Connecting a 1Ω resis-
tor from the Sense pin to GND2 limits the current through
the power MOSFET to 620mA (typ). I
LIM
= 620mV/R
SENSE
.
GND2:
Floating Ground Connects to the source of the
external N-channel MOSFET.
GND1:
Input Ground. The ground connection of the input
control signal.
U W
LTC1177-12
Input Current vs Temperature
50
25
75
0
TEMPERATURE (°C)
100
125
50
25
75
0
TEMPERATURE (°C)
100
125
1177-12 G13
1177-12 G14
LTC1177-12
Input Current vs Input Voltage
T
A
= 25°C
2.6
N18
2.2
SW28
1.8
1.4
9
10
11
12
13
INPUT VOLTAGE (V)
14
15
1177-12 G15
1177-12 G16
U
U
U
5
