1
LTC1177-5/LTC1177-12
Isolated MOSFET Drivers
S
FEATURE
D
U
ESCRIPTIO
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
2500V
RMS
of Isolation Voltage
s
Isolates Input from High Voltage Transients at Load
s
Clean, Bounce-Free Switching
s
Current Limit
s
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.
U
S
A
O
PPLICATI
s
Solid State Relay
s
Isolated Solenoid Driver
s
Isolated Motor Driver
s
Isolated Lamp Driver
U
A
O
PPLICATI
TYPICAL
V
IN
GND1
ISOLATION BARRIER
NC
NC
OUT
NC
GND2
SENSE
LTC1177-5
LTC1177-12
12
18
11
10
7
1
8
9
+
V
+
= 40V
V
OUT
R
OUT
50
47
µ
F
50V
5V OR 12V
0V
f = 50Hz
1177 TA01
MTD3055EL
Isolated High Side Switch
Input vs Output
V
OUT
V
IN
1177 TA02
2
LTC1177-5/LTC1177-12
LTC1177-5
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OUT
Output Voltage (Refer to GND2)
C
OUT
= 1000pF, No Load (N Pkg)
q
6.5
7.5
10
V
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (N Pkg)
q
5.5
6.5
10
V
C
OUT
= 1000pF, No Load (SW Pkg)
q
7.0
8.0
10
V
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (SW Pkg)
q
6.0
7.0
10
V
I
IN
Input Current
C
IN
= 1000pF
q
1.0
1.5
mA
I
LIM
Current Limit
R
SENSE
= 1
(LTC1177C-5)
q
400
620
800
mA
R
SENSE
= 1
(LTC1177I-5)
q
350
620
900
mA
t
ON
Turn-On Time
C
OUT
= 1000pF, No Load (LTC1177C-5)
q
1.0
4.0
ms
C
OUT
= 1000pF, No Load (LTC1177I-5)
q
1.0
4.5
ms
t
OFF
Turn-Off Time
C
OUT
= 1000pF, No Load
q
1.0
1.8
ms
V
ISO
Isolation Voltage
1 Minute (Note 1)
2500
V
RMS
1 Second
3000
V
RMS
t
CM
Common Mode Slew Rate
V
OUT
< 1.5, C
OUT
= 1000pF
1000
V/
µ
s
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
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)
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
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
T
JMAX
= 125
°
C,
JA
= 110
°
C/ W
LTC1177CN-5
LTC1177CN-12
LTC1177IN-5
LTC1177IN-12
Consult factory for Military grade parts.
V
IN
= 5V, T
A
= 25
°
C, unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
7
8
9
TOP VIEW
N PACKAGE
18-LEAD PDIP ISOLATION BARRIER
12
11
10
NC
NC
OUT
NC
GND2
SENSE
ISOLATION
BARRIER
GND1
V
IN
18
1
LTC1177CSW-5
LTC1177CSW-12
LTC1177ISW-5
LTC1177ISW-12
T
JMAX
= 125
°
C,
JA
= 125
°
C/ W
11
12
13
14
TOP VIEW
SW PACKAGE
28-LEAD PLASTIC SO WIDE
ISOLATION BARRIER
18
17
16
15
NC
NC
OUT
NC
NC
GND2
SENSE
NC
NC
GND1
NC
NC
NC
V
IN
NC
NC
28
27
26
25
1
2
3
4
ISOLATION
BARRIER
3
LTC1177-5/LTC1177-12
ELECTRICAL C
C
HARA TERISTICS
V
IN
= 12V, T
A
= 25
°
C unless otherwise noted.
LTC1177-12
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OUT
Output Voltage (Refer to GND2)
C
OUT
= 1000pF, No Load (LTC1177C-12, N Pkg)
q
4.65
5.2
8
V
C
OUT
= 1000pF, No Load (LTC1177C-12, SW Pkg)
q
5.00
5.7
8
V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, N Pkg)
q
4.40
4.9
7
V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, SW Pkg)
q
4.60
5.3
7
V
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
q
4.50
5.2
8
V
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
q
4.75
5.7
8
V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177I-12, SW Pkg)
q
4.50
5.3
7
V
I
IN
Input Current
C
IN
= 1000pF (LTC1177C-12)
q
2.5
3.0
mA
C
IN
= 1000pF (LTC1177I-12)
q
2.5
3.4
mA
I
LIM
Current Limit
R
SENSE
= 1
(LTC1177C-12)
q
400
620
800
mA
R
SENSE
= 1
(LTC1177I-12)
q
350
620
900
mA
t
ON
Turn-On Time
C
OUT
= 1000pF, No Load (LTC1177C-12)
q
1.0
2.5
ms
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
1.0
ms
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
q
1.0
2.5
ms
t
OFF
Turn-Off Time
C
OUT
= 1000pF, No Load (LTC1177C-12)
q
1.0
1.2
ms
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg)
1.0
ms
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg)
q
1.0
1.5
ms
V
ISO
Isolation Voltage
1 Minute (Note 1)
2500
V
RMS
1 Second
3000
V
RMS
TCM
Common Mode Slew Rate
V
OUT
< 1.5V, C
OUT
= 1000pF
1000
V/
µ
s
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1: Value derived from 1 second test.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
LTC1177-5
Turn-Off Time to V
OUT
= 1V
vs Temperature
TEMPERATURE (
°
C)
55 25
25
TURN-OFF TIME (ms)
0.8
1.0
1.2
125 150
1177-5 G01
0.6
0.4
0
0
50
75
100
0.2
1.8
1.4
1.6
N18, SW28
V
IN
= 5V
C
OUT
= 1000pF
LTC1177-5
Turn-On Time to V
OUT
= 4.5V
vs Temperature
TEMPERATURE (
°
C)
55 25
25
TURN-ON TIME (ms)
0.8
1.0
1.2
125 150
1177-5 G02
0.6
0.4
0
0
50
75
100
0.2
1.8
1.4
1.6
N18
SW28
V
IN
= 5V
C
OUT
= 1000pF
LTC1177-5
Output Current vs Output Voltage
OUTPUT VOLTAGE (V)
0
1
3
OUTPUT CURRENT (
µ
A)
8
10
12
7
8
1177-5 G03
6
4
0
2
4
5
6
2
18
14
16
N18
SW28
T
A
= 25
°
C
V
IN
= 5V
4
LTC1177-5/LTC1177-12
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
LTC1177-5
Output Voltage vs Temperature
TEMPERATURE (
°
C)
55 25
25
OUTPUT VOLTAGE (V)
4
5
6
125 150
1177-5 G04
3
2
0
0
50
75
100
1
9
7
8
SW28
N18
V
IN
= 5V
LTC1177-5
Output Voltage vs Input Voltage
TEMPERATURE (
°
C)
55 25
25
INPUT CURRENT (mA)
0.8
1.0
1.2
125 150
1177-5 G05
0.6
0.4
0
0
50
75
100
0.2
1.8
1.4
1.6
N18, SW28
V
IN
= 5V
LTC1177-5
Input Current vs Temperature
INPUT VOLTAGE (V)
0
1
3
OUTPUT VOLTAGE (V)
4
5
6
7
8
1177-5 G06
3
2
0
2
4
5
6
1
9
7
8
SW28
N18
T
A
= 25
°
C
LTC1177-5
Input Current vs Input Voltage
LTC1177-12 Turn-On Time to
V
OUT
= 4.5V vs Temperature
LTC1177-12 Turn-Off Time to
V
OUT
= 1V vs Temperature
INPUT VOLTAGE (V)
0
1
3
INPUT CURRENT (mA)
0.8
1.0
1.2
7
8
1177-5 G07
0.6
0.4
0
2
4
5
6
0.2
1.8
1.4
1.6
N18
SW28
T
A
= 25
°
C
TEMPERATURE (
°
C)
55
1.2
1.1
1.0
0.9
0.8
0.7
0.6
25
75
1177-12 G08
25
0
50
100
125
TURN-OFF TIME (ms)
N18
V
IN
= 12V
C
OUT
= 1000pF
SW28
TEMPERATURE (
°
C)
55
1.6
1.4
1.2
1.0
0.8
0.6
0.4
25
75
1177-12 G09
25
0
50
100
125
TURN-ON TIME (ms)
N18
SW28
V
IN
= 12V
C
OUT
= 1000pF
OUTPUT CAPACITANCE (pF)
500
TURN-ON TIME (ms)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1000
1500
SW28
N18
1177-12-G10
2000
T
A
= 25
°
C
V
IN
= 12V
LTC1177-12
Turn-On Time to V
OUT
= 4.5V
vs Output Capacitance
LTC1177-12
Turn-Off Time to V
OUT
= 1V
vs Output Capacitance
OUTPUT CAPACITANCE (pF)
500
1.0
1.1
1177-12 G11
0.9
0.8
1000
T
A
= 25
°
C
1500
2000
N18
SW28
TURN-OFF TIME (ms)
LTC1177-12
Output Current vs Output Voltage
OUTPUT VOLTAGE (V)
0
14
12
10
8
6
4
2
0
3
5
1177-12 G12
1
2
4
OUTPUT CURRENT (
µ
A)
N18
SW28
T
A
= 25
°
C
V
IN
= 12V
NO LOAD
5
LTC1177-5/LTC1177-12
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
LTC1177-12
Output Voltage vs Temperature
LTC1177-12
Input Current vs Temperature
TEMPERATURE (
°
C)
55
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
25
75
1177-12 G14
25
0
50
100
125
INPUT CURRENT (mA)
V
IN
= 12V
NO LOAD
N18
SW28
TEMPERATURE (
°
C)
55
6.4
6.2
6.0
5.8
5.6
5.4
5.2
5.0
25
75
1177-12 G13
25
0
50
100
125
OUTPUT VOLTAGE (V)
N18
SW28
V
IN
= 12V
NO LOAD
LTC1177-12
Output Voltage vs Input Voltage
INPUT VOLTAGE (V)
9
OUTPUT VOLTAGE (V)
8
7
6
5
4
3
10
11
12
13
1177-12 G15
14
N18
15
T
A
= 25
°
C
SW28
LTC1177-12
Input Current vs Input Voltage
INPUT VOLTAGE (V)
9
INPUT CURRENT (mA)
3.4
3.0
2.6
2.2
1.8
1.4
10
11
N18
SW28
12
13
1177-12 G16
14
15
T
A
= 25
°
C
SENSE: Current Limit Sense Input. Connecting a 1
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.
V
IN
: Voltage Input, 5.25V
V
IN
4.75V (LTC1177-5) and
12.6V
V
IN
11.4V (LTC1177-12). Connect a 0.01
µ
F
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.
PI
N
FU
N
CTIO
N
S
U
U
U
6
LTC1177-5/LTC1177-12
BLOCK DIAGRA
M
W
Solid State Relay
TYPICAL APPLICATIO
N
S
U
V
IN
OUT
SENSE
GND2
LTC1177-5
LTC1177-12
GND1
V
OUT
MTD3055EL
1177 TA04
V
+
= 24V
+
100k
1k
0.5
R
LOAD
I
µ
F
C
LOAD
47
µ
F
50V
ISOLATION BARRIER
5V OR 12V
0V
V
IN
OUT
SENSE
GND2
LTC1177-5
LTC1177-12
GND1
AC 60Hz
OUT
Si9944DY
20M
1177 TA03
ISOLATION BARRIER
Isolated High Side Switch with Fold-Back Current Limit
SWITCHI
N
G WAVEFOR
M
S
U
W
OSCILLATOR
GND1
CHARGE
PUMP
GND2
1k
1k
V
IN
OUT
SENSE
ISOLATION BARRIER
1177 BD01
2.5V OR 6V
2.5V OR 6V
0V
0V
5V OR 12V
V
IN
V
OUT
4.5V
1V
t
ON
t
OFF
1177 SW01
7
LTC1177-5/LTC1177-12
TYPICAL APPLICATIO
N
S
U
Solid State Relay
Fully Floating 50
°
F to 100
°
F Thermostat
ON/OFF
V
IN
SET POINT
GND
V
+
V
P-P
OSC
DELTA
1
2
3
4
8
7
6
5
LTC1041
18
11
10
1
9
10M
DELTA = 0.5
°
F
6.81k
*
49.9
49.9k
5k
4.32k
10
µ
F
56
100nF
26VAC
2-WIRE
THERMOSTAT
Si9955DY
7, 8
1, 3
2
4
5, 6
1
µ
F
5V OR 12V
1177 TA06
LTC1177-5
LTC1177-12
+
ALL RESISTORS 1%
* YELLOW SPRINGS INSTRUMENT CO. INC. P/N 44007
DRIVING THERMISTOR WITH V
P-P
ELIMINATES 3.8
°
F
SELF-HEATING ERROR
GND
V
IN
OUT
SENSE
GND2
LTC1177-5
LTC1177-12
GND1
V
IN
OUT
LTC1177-5
LTC1177-12
GND1
AC 60Hz
OUT
IRFR224
20M
1177 TA05
ISOLATION BARRIER
SENSE
GND2
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
8
LTC1177-5/LTC1177-12
PACKAGE DESCRIPTIO
N
U
Dimensions in inches (millimeters) unless otherwise noted.
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1145/LTC1146
Low Power Digital Isolator
Passes Digital Information Across Isolation Barrier
LT
®
1158
Half-Bridge N-Channel Power MOSFET Driver
Useful for Motor Speed Control, Synchronous Switching Regulator
LTC1255
Dual 24V High Side MOSFET Driver
User Set Current Limiting
N Package
18-Lead PDIP Isolation Barrier (Narrow 0.300)
(LTC DWG # 05-08-1590)
©
LINEAR TECHNOLOGY CORPORATION 1995
LT/GP 1195 10K · PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
SW Package
28-Lead Plastic Small Outline Isolation Barrier (Wide 0.300)
(LTC DWG # 05-08-1690)
0
°
8
°
TYP
NOTE 1
0.009 0.013
(0.229 0.330)
0.016 0.050
(0.406 1.270)
0.291 0.299**
(7.391 7.595)
×
45
°
0.010 0.029
(0.254 0.737)
0.005
(0.127)
RAD MIN
0.037 0.045
(0.940 1.143)
0.004 0.012
(0.102 0.305)
0.093 0.104
(2.362 2.642)
0.050
(1.270)
TYP
0.014 0.019
(0.356 0.482)
NOTE 1
0.697 0.712*
(17.70 18.08)
1
2
3
4
0.394 0.419
(10.007 10.643)
25
26
11
12
18
17
16
15
14
13
27
28
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
0.015
(0.381)
MIN
0.125
(3.175)
MIN
0.130
±
0.005
(3.302
±
0.127)
0.065
(1.651)
TYP
0.045 0.065
(1.143 1.651)
0.018
±
0.003
(0.457
±
0.076)
0.005
(0.127)
MIN
0.100
±
0.010
(2.540
±
0.254)
0.009 0.015
(0.229 0.381)
0.300 0.325
(7.620 8.255)
0.325
+0.025
0.015
+0.635
0.381
8.255
(
)
0.255
±
0.015*
(6.477
±
0.381)
0.900*
(22.860)
MAX
18
1
7
8
9
10
11
12
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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