1
LTC1177-5/LTC1177-12
Isolated MOSFET Drivers
S
FEATURE
D
U
ESCRIPTIO
■
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.
U
S
A
O
PPLICATI
■
Solid State Relay
■
Isolated Solenoid Driver
■
Isolated Motor Driver
■
Isolated Lamp Driver
U
A
O
PPLICATITYPICAL
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
50Ω
47µF
50V
5V OR 12V
0V
f = 50Hz
1177 TA01
MTD3055EL
Isolated High Side Switch Input vs Output
V
OUT
V
IN
1177 TA02
FOR INFORMATION PURPOSES ONLY
OBSOLETE:
Contact Linear Technology for Potential Replacement
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) ●6.5 7.5 10 V
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (N Pkg) ●5.5 6.5 10 V
C
OUT
= 1000pF, No Load (SW Pkg) ●7.0 8.0 10 V
C
OUT
= 1000pF, No Load, V
IN
= 4.75V (SW Pkg) ●6.0 7.0 10 V
I
IN
Input Current C
IN
= 1000pF ●1.0 1.5 mA
I
LIM
Current Limit R
SENSE
= 1Ω (LTC1177C-5) ●400 620 800 mA
R
SENSE
= 1Ω (LTC1177I-5) ●350 620 900 mA
t
ON
Turn-On Time C
OUT
= 1000pF, No Load (LTC1177C-5) ●1.0 4.0 ms
C
OUT
= 1000pF, No Load (LTC1177I-5) ●1.0 4.5 ms
t
OFF
Turn-Off Time C
OUT
= 1000pF, No Load ●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/µs
A
U
G
W
A
W
U
W
ARBSOLUTEXI T
IS
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
WU
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
T
JMAX
= 125°C,
θ
JA
= 110°C/W
LTC1177CN-5
LTC1177CN-12
LTC1177IN-5
LTC1177IN-12
Consult factory for Military grade parts.
VIN = 5V, TA = 25°C, unless otherwise noted.
ELECTRICAL C CHARA 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,
θ
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 CHARA TERISTICS
VIN = 12V, TA = 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) ●4.65 5.2 8 V
C
OUT
= 1000pF, No Load (LTC1177C-12, SW Pkg) ●5.00 5.7 8 V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, N Pkg) ●4.40 4.9 7 V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177C-12, SW Pkg) ●4.60 5.3 7 V
C
OUT
= 1000pF, No Load (LTC1177I-12, N Pkg) ●4.50 5.2 8 V
C
OUT
= 1000pF, No Load (LTC1177I-12, SW Pkg) ●4.75 5.7 8 V
C
OUT
= 1000pF, V
IN
= 11.4V (LTC1177I-12, SW Pkg) ●4.50 5.3 7 V
I
IN
Input Current C
IN
= 1000pF (LTC1177C-12) ●2.5 3.0 mA
C
IN
= 1000pF (LTC1177I-12) ●2.5 3.4 mA
I
LIM
Current Limit R
SENSE
= 1Ω (LTC1177C-12) ●400 620 800 mA
R
SENSE
= 1Ω (LTC1177I-12) ●350 620 900 mA
t
ON
Turn-On Time C
OUT
= 1000pF, No Load (LTC1177C-12) ●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) ●1.0 2.5 ms
t
OFF
Turn-Off Time C
OUT
= 1000pF, No Load (LTC1177C-12) ●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) ●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/µs
The ● denotes specifications which apply over the full operating
temperature range. Note 1: Value derived from 1 second test.
TYPICAL PERFORMANCE CHARACTERISTICS
UW
LTC1177-5
Turn-Off Time to VOUT = 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
0050 75 100
0.2
1.8
1.4
1.6
N18, SW28
V
IN
= 5V
C
OUT
= 1000pF
LTC1177-5
Turn-On Time to VOUT = 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
0050 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)
01 3
OUTPUT CURRENT (µA)
8
10
12
78
1177-5 G03
6
4
02456
2
18
14
16
N18
SW28
T
A
= 25°C
V
IN
= 5V
4
LTC1177-5/LTC1177-12
TYPICAL PERFORMANCE CHARACTERISTICS
UW
LTC1177-5
Output Voltage vs Temperature
TEMPERATURE (°C)
–55 –25 25
OUTPUT VOLTAGE (V)
4
5
6
125 150
1177-5 G04
3
2
0050 75 100
1
9
7
8SW28
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
0050 75 100
0.2
1.8
1.4
1.6
N18, SW28
V
IN
= 5V
LTC1177-5
Input Current vs Temperature
INPUT VOLTAGE (V)
01 3
OUTPUT VOLTAGE (V)
4
5
6
78
1177-5 G06
3
2
02456
1
9
7
8SW28
N18
T
A
= 25°C
LTC1177-5
Input Current vs Input Voltage LTC1177-12 Turn-On Time to
VOUT = 4.5V vs Temperature
LTC1177-12 Turn-Off Time to
VOUT = 1V vs Temperature
INPUT VOLTAGE (V)
01 3
INPUT CURRENT (mA)
0.8
1.0
1.2
78
1177-5 G07
0.6
0.4
02456
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
VIN = 12V
COUT = 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
VIN = 12V
COUT = 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 VOUT = 4.5V
vs Output Capacitance
LTC1177-12
Turn-Off Time to VOUT = 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
035
1177-12 G12
12 4
OUTPUT CURRENT (µA)
N18
SW28
TA = 25°C
VIN = 12V
NO LOAD
5
LTC1177-5/LTC1177-12
TYPICAL PERFORMANCE CHARACTERISTICS
UW
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)
VIN = 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
VIN = 12V
NO LOAD
LTC1177-12
Output Voltage vs Input Voltage
INPUT VOLTAGE (V)
9
OUTPUT VOLTAGE (V)
8
7
6
5
4
310 11 12 13
1177-12 G15
14
N18
15
TA = 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
TA = 25°C
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.
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.
PIN FUNCTIONS
UUU
6
LTC1177-5/LTC1177-12
BLOCK DIAGRAM
W
Solid State Relay
TYPICAL APPLICATIONS
U
V
IN
OUT
SENSE
GND2
LTC1177-5
LTC1177-12
GND1 V
OUT
MTD3055EL
1177 TA04
V
+
= 24V
+
100k
1k
0.5Ω
R
LOAD
IµF
C
LOAD
47µF
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
SWITCHING WAVEFORMS
UW
OSCILLATOR
GND1
CHARGE
PUMP
φ
φ
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 APPLICATIONS
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
19
10M
DELTA = 0.5°F
6.81k
*
49.9Ω
49.9k
5k
4.32k
10µF
56Ω
100nF
26VAC
2-WIRE
THERMOSTAT
Si9955DY
7, 8
1, 3
2
4
5, 6
1µF
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 DESCRIPTION
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
●
FAX
: (408) 434-0507
●
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)
1234
0.394 – 0.419
(10.007 – 10.643)
2526
11 12
18 17 16 15
1413
2728
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
1789
1011
12
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
